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1.
BMC Complement Med Ther ; 21(1): 71, 2021 Feb 19.
Artículo en Inglés | MEDLINE | ID: mdl-33607987

RESUMEN

BACKGROUND: In previous studies, Cassia spectabilis DC leaf has shown a good antiplasmodial activity. Therefore, this study is a follow-up study of the extract of leaf of C. spectabilis DC on its in vitro and in vivo antiplasmodial activity and mechanism as an antimalarial. METHODS: The extract was fractionated, sub-fractionated and isolated to obtain the purified compound. In vitro antiplasmodial activity test against Plasmodium falciparum to find out the active compound. In vivo test against P. berghei ANKA-infected mice was conducted to determine prophylactic activity and antiplasmodial activity either alone or in combination with artesunate. The inhibition of heme detoxification test as one of the antimalarial mechanisms was carried out using the Basilico method. RESULTS: The results showed that active antimalarial compound isolated from C. spectabilis DC leaf had a structural pattern that was identical to (-)-7-hydroxycassine. Prophylactic test of 90% ethanolic extract of C. spectabilis DC leaf alone against P. berghei ANKA-infected mice obtained the highest percentage inhibition was 68.61%, while positive control (doxycycline 13 mg/kg) was 73.54%. In combination with artesunate, 150 mg/kg three times a day of C. spectabilis DC (D0-D2) + artesunate (D2) was better than the standard combination of amodiaquine + artesunate where the inhibition percentages were 99.18 and 92.88%, respectively. The IC50 of the extract for the inhibitory activity of heme detoxification was 0.375 mg/ml which was better than chloroquine diphosphate (0.682 mg/ml). CONCLUSION: C. spectabilis DC leaf possessed potent antiplasmodial activity and may offer a potential agent for effective and affordable antimalarial phytomedicine.


Asunto(s)
Antimaláricos/farmacología , Cassia/química , Hemo/metabolismo , Malaria/parasitología , Extractos Vegetales/farmacología , Plasmodium berghei/efectos de los fármacos , Plasmodium falciparum/efectos de los fármacos , Animales , Antimaláricos/aislamiento & purificación , Antimaláricos/uso terapéutico , Artesunato/uso terapéutico , Cloroquina/análogos & derivados , Cloroquina/farmacología , Cetonas , Malaria/tratamiento farmacológico , Masculino , Ratones Endogámicos BALB C , Fitoterapia , Piperidinas , Extractos Vegetales/química , Extractos Vegetales/uso terapéutico , Hojas de la Planta/química , Plasmodium berghei/metabolismo , Plasmodium falciparum/metabolismo
2.
Int J Med Sci ; 17(12): 1803-1810, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32714083

RESUMEN

Since the end of 2019, a new type of coronavirus pneumonia (COVID-19) caused by the Severe Acute Respiratory Syndrome Coronavirus-2 (SARS-CoV-2) has been spreading rapidly throughout the world. Previously, there were two outbreaks of severe coronavirus caused by different coronaviruses worldwide, namely Severe Acute Respiratory Syndrome Coronavirus (SARS-CoV) and the Middle East Respiratory Syndrome Coronavirus (MERS-CoV). This article introduced the origin, virological characteristics and epidemiological overview of SARS-CoV-2, reviewed the currently known drugs that may prevent and treat coronavirus, explained the characteristics of the new coronavirus and provided novel information for the prevention and treatment of COVID-19.


Asunto(s)
Betacoronavirus , Infecciones por Coronavirus/tratamiento farmacológico , Infecciones por Coronavirus/prevención & control , Pandemias/prevención & control , Neumonía Viral/tratamiento farmacológico , Neumonía Viral/prevención & control , Amidas/farmacología , Amidas/uso terapéutico , Anticuerpos Monoclonales/uso terapéutico , Antivirales/farmacología , Antivirales/uso terapéutico , Betacoronavirus/aislamiento & purificación , Betacoronavirus/fisiología , COVID-19 , Cloroquina/análogos & derivados , Cloroquina/uso terapéutico , Clorpromazina/uso terapéutico , Coronavirus/genética , Infecciones por Coronavirus/genética , Ciclofilinas/antagonistas & inhibidores , Desarrollo de Medicamentos , Reposicionamiento de Medicamentos , Medicamentos Herbarios Chinos/uso terapéutico , Endocitosis/efectos de los fármacos , Humanos , Sueros Inmunes , Inductores de Interferón/uso terapéutico , Inhibidores de la Síntesis del Ácido Nucleico/farmacología , Inhibidores de la Síntesis del Ácido Nucleico/uso terapéutico , Neumonía Viral/genética , Pirazinas/farmacología , Pirazinas/uso terapéutico , Resveratrol/farmacología , Resveratrol/uso terapéutico , SARS-CoV-2 , Vacunas Virales/uso terapéutico , Tratamiento Farmacológico de COVID-19
3.
In Vivo ; 34(3 Suppl): 1597-1602, 2020 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-32503817

RESUMEN

Severe acute respiratory syndrome coronavirus 2 (SARS-Cov-2), initially termed 2019-new CoV (2019-nCoV), is a novel coronavirus responsible for the severe respiratory illness currently ongoing worldwide from the beginning of December 2019. This beta gene virus, very close to bat coronaviruses (bat-CoV-RaTG13) and bat-SL-CoVZC45, causes a severe disease, similar to those caused by Middle East respiratory syndrome (MERS)-CoV and SARS-CoV viruses, featured by low to moderate mortality rate. Unfortunately, the antiviral drugs commonly used in clinical practice to treat viral infections, are not applicable to SARS-Cov-2 and no vaccine is available. Thus, it is extremely necessary to identify new drugs suitable for the treatment of the 2019-nCoV outbreak. Different preclinical studies conducted on other coronaviruses suggested that promising clinical outcomes for 2019-nCoV should be obtained by using alpha-interferon, chloroquine phosphate, arabinol, remdesivir, lopinavir/ritonavir, and anti-inflammatory drugs. Moreover, clinical trials with these suitable drugs should be performed on patients affected by SARS-Cov-2 to prove their efficacy and safety. Finally, a very promising therapeutic drug, tocilizumab, is discussed; it is currently used to treat patients presenting COVID-19 pneumonia. Herein, we recapitulate these experimental studies to highlight the use of antiviral drugs for the treatment of SARS-Cov-2 disease.


Asunto(s)
Antivirales/uso terapéutico , Infecciones por Coronavirus/tratamiento farmacológico , Pandemias , Neumonía Viral/tratamiento farmacológico , Adenosina Monofosfato/análogos & derivados , Adenosina Monofosfato/uso terapéutico , Alanina/análogos & derivados , Alanina/uso terapéutico , Animales , Anticuerpos Monoclonales Humanizados/uso terapéutico , Antivirales/administración & dosificación , Antivirales/farmacología , Betacoronavirus/efectos de los fármacos , COVID-19 , Cloroquina/análogos & derivados , Cloroquina/uso terapéutico , Ensayos Clínicos como Asunto , Infecciones por Coronavirus/complicaciones , Infecciones por Coronavirus/epidemiología , Infecciones por Coronavirus/veterinaria , Combinación de Medicamentos , Evaluación Preclínica de Medicamentos , Sinergismo Farmacológico , Quimioterapia Combinada , Drogas en Investigación/uso terapéutico , Humanos , Indoles/uso terapéutico , Lopinavir/uso terapéutico , Estudios Multicéntricos como Asunto , Neuraminidasa/antagonistas & inhibidores , Neumonía Viral/complicaciones , Neumonía Viral/epidemiología , Primates , Ribavirina/uso terapéutico , Ritonavir/uso terapéutico , SARS-CoV-2 , Resultado del Tratamiento
4.
Aging (Albany NY) ; 12(12): 11224-11237, 2020 06 17.
Artículo en Inglés | MEDLINE | ID: mdl-32554861

RESUMEN

With the outbreak of coronavirus disease-19 (COVID-19), Changsha faced an increasing burden of treating the Wuhan migrants and their infected patients. This study is a retrospective, single-center case series of the 238 consecutive hospitalized patients with confirmed COVID-19 at the First Hospital of Changsha city, China, from 01/21 to 02/14, 2020; the final date of follow-up was 02/27, 2020. Of 238 patients 43.7% visited Wuhan, 58.4% got in touch with Wuhan people, and 47.5% had contacted with diagnosed patients. 37.8% patients had family members infected. 190 cases had mild / general disease, and 48 cases had severe / critical disease. Compared to mild or general patients, more severe or critical patients visited Wuhan (59.6% vs 40.2%; P=0.02) and contacted with Wuhan people (74.5% vs 55.0%; P=0.02). All patients received antiviral treatment, including Lopinavir / Ritonavir (29.3%), Interferon (14.6%) and their combination (40.6%), Arbidol (6.7%), Xuebijing (7.1%) and Chloroquine phosphate (1.3%). Severe and critical patients received glucocorticoid, Gamma-globulin and oxygen inhalation. Some received mechanic ventilation support. As of 02/27, 161 patients discharged. The median length of hospital stay was 13 days. The 10-, 14-, 20- and 28-day discharge rate was 19.1%, 42.8%, 65.0% and 76.4%, respectively. No hospital-related transmission was observed.


Asunto(s)
Antivirales/uso terapéutico , Betacoronavirus , Infecciones por Coronavirus/epidemiología , Infecciones por Coronavirus/terapia , Neumonía Viral/epidemiología , Neumonía Viral/terapia , Respiración Artificial , Adulto , Antiinflamatorios no Esteroideos/uso terapéutico , COVID-19 , China/epidemiología , Cloroquina/análogos & derivados , Cloroquina/uso terapéutico , Combinación de Medicamentos , Medicamentos Herbarios Chinos/uso terapéutico , Femenino , Glucocorticoides/uso terapéutico , Hospitalización , Humanos , Factores Inmunológicos/uso terapéutico , Indoles/uso terapéutico , Interferones/uso terapéutico , Lopinavir/uso terapéutico , Masculino , Persona de Mediana Edad , Oxígeno/uso terapéutico , Pandemias , Estudios Retrospectivos , Ritonavir/uso terapéutico , SARS-CoV-2 , gammaglobulinas/uso terapéutico
5.
Med Hypotheses ; 142: 109754, 2020 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-32438240

RESUMEN

The recent global pandemic created by the Coronavirus SARS-CoV-2, started in Wuhan, China in December 2019, has generated panic, both in term of human death (4-5% of infected patients identified through testing) and the global economy. Human sufferings seem to be continuing, and it is not clear how long this will continue and how much more destruction it is going to cause until complete control is achieved. One of the most disturbing issues is Covid-19 treatment; although a large number of medications, previously used successfully with other viruses (including Chinese herbal medicines and anti-malaria drugs), are under consideration, there remain questions as to whether they can play a satisfactory role for this disease. Global attempts are ongoing to find the drugs for the treatment of this virus but none of the antiviral drugs used for treatment of other human viral infection is working and hence attempts to find new drugs are continuing. Here the author is proposing that 5-Fluorouracil (5-FU) which when used on its own is failing as an antiviral agent due to the removal of this compound by proof reading ability exceptionally found in Coronaviruses. The author here is proposing to test 5-FU in combination with a number of deoxynucleosides on animal models infected with this Covid-19. Should encouraging results ensue, therapies could then be tried on patients.


Asunto(s)
Infecciones por Coronavirus/tratamiento farmacológico , Desoxirribonucleósidos/administración & dosificación , Desoxirribosa/administración & dosificación , Fluorouracilo/administración & dosificación , Neumonía Viral/tratamiento farmacológico , Adenosina Monofosfato/administración & dosificación , Adenosina Monofosfato/análogos & derivados , Alanina/administración & dosificación , Alanina/análogos & derivados , Betacoronavirus , COVID-19 , Cloroquina/administración & dosificación , Cloroquina/análogos & derivados , Ensayos Clínicos como Asunto , Esquema de Medicación , Sinergismo Farmacológico , Humanos , Inflamación/tratamiento farmacológico , Modelos Teóricos , Pandemias , SARS-CoV-2 , Tratamiento Farmacológico de COVID-19
6.
J Med Virol ; 92(6): 540-545, 2020 06.
Artículo en Inglés | MEDLINE | ID: mdl-32108352

RESUMEN

So far, there is a lack of effective drugs for the new coronavirus pneumonia. With more and more patients diagnosed, China has carried out more than 100 clinical studies of new coronavirus infection, including antiviral drugs, antimalarial drugs, glucocorticoids, plasma therapy, virus vaccine, and other Western drugs, while Chinese medicine research accounted for half of the studies. Most of the trials were initiated by investigators and the study period would last for 1 to 11 months. The primary endpoints included symptom improvement and virus nucleic acid turning negative, but the optimal endpoint has not been determined. Although the final results of studies will take a long time to complete, the interim research data may provide some help for the current urgent demand for drug treatment. Compared with that of during SARS period in 2003, China has the stronger capability to carry out clinical trials of new drugs in emergency period.


Asunto(s)
Antivirales/uso terapéutico , Infecciones por Coronavirus/tratamiento farmacológico , Infecciones por Coronavirus/epidemiología , Brotes de Enfermedades , Medicamentos Herbarios Chinos/uso terapéutico , Neumonía Viral/tratamiento farmacológico , Neumonía Viral/epidemiología , Adenosina Monofosfato/análogos & derivados , Adenosina Monofosfato/uso terapéutico , Alanina/análogos & derivados , Alanina/uso terapéutico , Amidas/uso terapéutico , Betacoronavirus/efectos de los fármacos , Betacoronavirus/genética , Betacoronavirus/patogenicidad , COVID-19 , China/epidemiología , Cloroquina/análogos & derivados , Cloroquina/uso terapéutico , Ensayos Clínicos como Asunto , Infecciones por Coronavirus/diagnóstico , Infecciones por Coronavirus/virología , Manejo de la Enfermedad , Humanos , Medicina Tradicional China/métodos , Pandemias , Neumonía Viral/diagnóstico , Neumonía Viral/virología , Guías de Práctica Clínica como Asunto , Pirazinas/uso terapéutico , SARS-CoV-2
7.
ChemMedChem ; 14(23): 1982-1994, 2019 12 04.
Artículo en Inglés | MEDLINE | ID: mdl-31665565

RESUMEN

The treatment of malaria, the most common parasitic disease worldwide and the third deadliest infection after HIV and tuberculosis, is currently compromised by the dramatic increase and diffusion of drug resistance among the various species of Plasmodium, especially P. falciparum (Pf). In this view, the development of new antiplasmodial agents that are able to act via innovative mechanisms of action, is crucial to ensure efficacious antimalarial treatments. In one of our previous communications, we described a novel class of compounds endowed with high antiplasmodial activity, characterized by a pharmacophore never described before as antiplasmodial and identified by their 4,4'-oxybisbenzoyl amide cores. Here, through a detailed structure-activity relationship (SAR) study, we thoroughly investigated the chemical features of the reported scaffolds and successfully built a novel antiplasmodial agent active on both chloroquine (CQ)-sensitive and CQ-resistant Pf strains in the low nanomolar range, without displaying cross-resistance. Moreover, we conducted an in silico pharmacophore mapping.


Asunto(s)
Antimaláricos/síntesis química , Cloroquina/análogos & derivados , Cloroquina/síntesis química , Malaria/tratamiento farmacológico , Plasmodium falciparum/efectos de los fármacos , Aminas/química , Animales , Antimaláricos/farmacología , Cloroquina/farmacología , Perros , Relación Dosis-Respuesta a Droga , Evaluación Preclínica de Medicamentos , Resistencia a Medicamentos , Humanos , Riñón/efectos de los fármacos , Viabilidad Microbiana , Modelos Moleculares , Estructura Molecular , Pruebas de Sensibilidad Parasitaria , Relación Estructura-Actividad
8.
Kaohsiung J Med Sci ; 34(5): 255-262, 2018 May.
Artículo en Inglés | MEDLINE | ID: mdl-29699632

RESUMEN

Dietary anthocyanin compounds have multiple biological effects, including antioxidant, anti-inflammatory, and anti-atherosclerotic characteristics. The present study evaluated the anti-tumor capacity of mulberry anthocyanins (MA) in thyroid cancer cells. Our data showed that MA suppressed SW1736 and HTh-7 cell proliferation in a time- and dose-dependent manner. Meanwhile, flow cytometry results indicated that MA significantly increased SW1736 and HTh-7 cell apoptosis. We additionally observed that SW1736 and HTh-7 cell autophagy was markedly enhanced after MA treatment. Importantly, anthocyanin-induced cell death was largely abolished by 3-methyladenine (3-MA) or chloroquine diphosphate salt (CQ) treatment, suggesting that MA-induced SW1736 and HTh-7 cell death was partially dependent on autophagy. In addition, activation of protein kinase B (Akt), mammalian target of rapamycin (mTOR), and ribosomal protein S6 (S6) were significantly suppressed by anthocyanin exposure. In summary, MA may serve as an adjunctive therapy for thyroid cancer patients through induction of apoptosis and autophagy-dependent cell death.


Asunto(s)
Antocianinas/farmacología , Antineoplásicos Fitogénicos/farmacología , Apoptosis/efectos de los fármacos , Autofagia/efectos de los fármacos , Regulación Neoplásica de la Expresión Génica , Morus/química , Adenina/análogos & derivados , Adenina/farmacología , Antocianinas/aislamiento & purificación , Antineoplásicos Fitogénicos/aislamiento & purificación , Apoptosis/genética , Autofagia/genética , Línea Celular Tumoral , Proliferación Celular/efectos de los fármacos , Cloroquina/análogos & derivados , Cloroquina/farmacología , Relación Dosis-Respuesta a Droga , Humanos , Extractos Vegetales/química , Proteínas Proto-Oncogénicas c-akt/genética , Proteínas Proto-Oncogénicas c-akt/metabolismo , Proteína S6 Ribosómica/genética , Proteína S6 Ribosómica/metabolismo , Transducción de Señal , Serina-Treonina Quinasas TOR/genética , Serina-Treonina Quinasas TOR/metabolismo , Glándula Tiroides/efectos de los fármacos , Glándula Tiroides/metabolismo , Glándula Tiroides/patología
9.
Pak J Pharm Sci ; 30(5): 1679-1690, 2017 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-29084690

RESUMEN

Dengue infection is rapidly spreading in most of the countries of south Asia. It is of utmost importance to explore the plants with "anti-thrombocytopenic activity" the dreadful response of dengue fever. The present study was conducted to investigate the potential of aqueous extract of Nigella sativa (black cumin) seeds in alleviating the severity of dengue disease by raising the platelet count (PLT). Serum samples of thirty patients with dengue hemorrhagic fever (DHF) were analysed for different biochemical parameters. When compared with control groups, the patients were found with very low PLT count (7.62 fold), reduced antioxidant levels; catalase (1.4 fold), ascorbic acid (1.1 fold), bilirubin (1.06 fold), and severe deficiency of micronutrient concentrations; cobalt (2.27 fold), iron (2.35 fold) and nickel (71.46 fold). Similar parameters were studied in albino rats to observe the changes in serum levels of biochemical markers, after administration of single dose of choloroquine phosphate (IM, 1.5 mL saline). The drug successfully induced thrombocytopenia along with significant decrease in levels of antioxidants and trace metals. Administration of N. sativa aqueous seed extract (15.25 mg/kg/bw) for 12 days resulted in an increase in PLT count (1.59 fold) as compared to control group. N. sativa post-treatment was found effective in elevating the serum levels of catalase, ascorbic acid, and bilirubin (1.06, 1.58 and 0.4 folds respectively). However, the N. sativa pre-treatment was useful in increasing the levels of micronutrients; iron, nickel and cobalt when compared to quinine-induced group. From the above findings it was suggested that N. sativa seed aqueous extract supplementation would be a promising solution for declined PLT count and associated consequences.


Asunto(s)
Antioxidantes/farmacología , Plaquetas/efectos de los fármacos , Cloroquina/análogos & derivados , Nigella sativa/química , Extractos Vegetales/farmacología , Semillas/química , Trombocitopenia/tratamiento farmacológico , Adolescente , Adulto , Animales , Antioxidantes/aislamiento & purificación , Estudios de Casos y Controles , Modelos Animales de Enfermedad , Femenino , Humanos , Masculino , Persona de Mediana Edad , Estrés Oxidativo/efectos de los fármacos , Extractos Vegetales/aislamiento & purificación , Recuento de Plaquetas , Ratas , Dengue Grave/sangre , Dengue Grave/diagnóstico , Trombocitopenia/sangre , Trombocitopenia/inducido químicamente , Factores de Tiempo , Oligoelementos/sangre , Adulto Joven
10.
Parasitol Res ; 115(4): 1667-74, 2016 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-26911147

RESUMEN

Malaria, caused by plasmodium parasite, is at the moment the highest cause of morbidity and mortality in the tropics. Recently, there is increasing efforts to develop more potent antimalarials from plant sources that will have little or no adverse effects. This study is aimed at investigating the in vivo mice antimalarial and in vitro antiplasmodial effects of two Meliaceae plants commonly used in Nigerian ethnomedicine as part of recipe for treating malaria infection: Chukrasia tabularis and Turraea vogelii. Hot water decoction and methanol extract of both plants were evaluated for their antimalarial activity in vivo using the mice model assay and in vitro using the parasite lactate dehydrogenase (pLDH) assay. The extracts were also assessed for toxicity with brine shrimp lethality assay and in mammalian cell lines using the neural red assay. The in vivo mice model antimalarial study showed that the methanol extract of the stem bark of C. tabularis exhibited the highest % chemosuppression (83.65 ± 0.66) at the highest dosage administered (800 mg/kg) when compared with chloroquine diphosphate, the standard reference drug which had a % suppression of 90.36 ± 0.04 (p < 0.05). The in vitro antiplasmodial study indicated that the aqueous extract of the stem bark of C. tabularis displayed good activity against Plasmodium falciparum chloroquine-sensitive (D6) strain (IC50 of 10.739 µg/mL) and chloroquine-resistant (W2) strain. Chloroquine and artemisinin had <0.163 and <0.0264, respectively.


Asunto(s)
Antimaláricos/farmacología , Malaria/tratamiento farmacológico , Meliaceae/química , Extractos Vegetales/farmacología , Plasmodium falciparum/efectos de los fármacos , Animales , Artemia/efectos de los fármacos , Artemisininas/farmacología , Supervivencia Celular/efectos de los fármacos , Cloroquina/análogos & derivados , Resistencia a Medicamentos , Malaria/parasitología , Masculino , Ratones , Corteza de la Planta/química , Extractos Vegetales/química , Tallos de la Planta/química , Plasmodium berghei
11.
Parasitol Res ; 115(1): 299-305, 2016 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-26391173

RESUMEN

The use of plant to meet health-care needs has greatly increased worldwide in the recent times. The search for new plant-derived bioactive agents that can be explored for the treatment of drug-resistant malaria infection is urgently needed. Thus, we evaluated the antimalarial activity of three medicinal plants used in Nigerian folklore for the treatment of malaria infection. A modified Peter's 4-day suppressive test was used to evaluate the antimalarial activity of the plant extracts in a mouse model of chloroquine-resistant Plasmodium berghei ANKA strain. Animals were treated with 250, 500, or 800 mg/kg of aqueous extract. It was observed that of all the three plants studied, Markhamia tomentosa showed the highest chemosuppression of parasites of 73 % followed by Polyalthia longifolia (53 %) at day 4. All the doses tested were well tolerated. Percentage suppression of parasite growth on day 4 post-infection ranged from 1 to 73 % in mice infected with P. berghei and treated with extracts when compared with chloroquine diphosphate, the standard reference drug which had a chemosuppression of 90 %. The percentage survival of mice that received extract ranged from 0 to 60 % (increased as the dose increases to 800 mg/kg). Phytochemical analysis revealed the presence of tannins, saponins, and phenolic compounds in all the three plants tested.


Asunto(s)
Antimaláricos/uso terapéutico , Malaria/tratamiento farmacológico , Fitoterapia , Extractos Vegetales/uso terapéutico , Plantas Medicinales/química , Plasmodium berghei/efectos de los fármacos , Animales , Antimaláricos/farmacología , Bignoniaceae/química , Cloroquina/análogos & derivados , Cloroquina/farmacología , Resistencia a Medicamentos , Femenino , Masculino , Meliaceae/química , Ratones , Nigeria , Parasitemia/tratamiento farmacológico , Corteza de la Planta/química , Extractos Vegetales/química , Hojas de la Planta/química , Polyalthia/química
12.
Eur J Med Chem ; 94: 30-44, 2015 Apr 13.
Artículo en Inglés | MEDLINE | ID: mdl-25768697

RESUMEN

A new series of pyrazole derivatives were synthesized by hybridization with five-membered heterocyclic moieties such as thiazoles, thiazolidinones, 1,3,4-thiadiazoles and pyrazolines. The compounds were evaluated for their in vivo antimalarial activity against Plasmodium berghei infected mice and the most active derivatives were further examined for their in vitro antimalarial activity against chloroquine resistant (RKL9) strain of Plasmodium falciparum. Compounds 2c, 2d, 4b, 4c, 4d, 5a, 6c, 8c and 9b had more than 90% parasite suppression activity of that found with the antimalarial reference standard drug, chloroquine phosphate and had lower IC50 values than chloroquine. Compounds 4b and 9b were the most active derivatives, and their activities were 5-fold higher than chloroquine. All the newly synthesized compounds were evaluated for their in vitro antileishmanial activity against Leishmania aethiopica promastigotes and amastigote. The results showed that compounds 2c, 2d, 3d, 4b, 4c, 4d and 5a had lower or similar IC50 values than the reference standard drugs, amphotericin B and miltefosine. Compound 3d had the highest antileishmanial activity. Collectively, compounds 2c, 2d, 4b, 4c, 4d and 5a exhibited dual activity against malaria and leishmaniasis and were safe and well tolerated by the experimental animals orally up to 300 mg/kg and parenterally up to 100 mg/kg.


Asunto(s)
Antimaláricos/química , Antimaláricos/farmacología , Tripanocidas/farmacología , Animales , Antimaláricos/síntesis química , Técnicas de Química Sintética , Cloroquina/análogos & derivados , Cloroquina/farmacología , Diseño de Fármacos , Evaluación Preclínica de Medicamentos/métodos , Femenino , Compuestos Heterocíclicos/síntesis química , Compuestos Heterocíclicos/química , Compuestos Heterocíclicos/farmacología , Concentración 50 Inhibidora , Leishmania/efectos de los fármacos , Leishmania/patogenicidad , Leishmaniasis/tratamiento farmacológico , Malaria/tratamiento farmacológico , Masculino , Ratones , Simulación del Acoplamiento Molecular , Plasmodium berghei/patogenicidad , Plasmodium falciparum/efectos de los fármacos , Pirazoles/química , Tripanocidas/síntesis química , Tripanocidas/química
13.
Apoptosis ; 19(8): 1215-24, 2014 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-24841932

RESUMEN

Aristolochic acid I (AAI) can induce renal tubular epithelial cells (RTECs) autophagy, which thereby extenuates apoptosis in vitro. In this study, we aimed to determine whether the in vitro data also apply to the AAI-induced pathologic condition in vivo. BALB/c mice were treated with AAI, autophagy inhibitors [3-methyladenine (3MA) or chloroquine diphosphate salt (CQ)], and AAI plus the inhibitors for consecutive 5 days, respectively. Mice were euthanized on day 3 and 5. AAI induced RTECs autophagy was confirmed by electron microscopy and western blot. The results showed induction of apoptotic RTECs and up-regulation of mitochondrial and endoplasmic reticulum stress-related proteins in AAI-treated mice at both of the two time points. There were more apoptotic RTECs in AAI + inhibitor groups, which might be due to increased mitochondrial stress-related proteins (cytochrome C and apoptotic protease activating factor 1, APAF-1). On day 5, severe tubulointerstitial injuries induced by AAI led to a significant decline in kidney function. There were numerous autolysosomes in dying RTECs of the AAI group. Autophagy inhibitors increased AAI-induced RTECs mitochondrial apoptosis by increasing mitochondrial stress-related proteins, but they partially mitigated the AAI-induced severe renal tubulointerstitial injury. These results confirmed that AAI could induce autophagy in RTECs, which prevented apoptosis via mitochondrial pathway in vivo. However, continuous stimulation with AAI induced excess autophagy, which ultimately resulted in AAI-induced cell death. It suggested that apoptosis wasn't the main culprit in acute aristolochic acid nephropathy mice model.


Asunto(s)
Apoptosis/efectos de los fármacos , Ácidos Aristolóquicos/efectos adversos , Autofagia/efectos de los fármacos , Células Epiteliales/efectos de los fármacos , Enfermedades Renales/patología , Túbulos Renales/efectos de los fármacos , Mitocondrias/efectos de los fármacos , Adenina/análogos & derivados , Adenina/farmacología , Animales , Aristolochia , Cloroquina/análogos & derivados , Cloroquina/farmacología , Medicamentos Herbarios Chinos/efectos adversos , Estrés del Retículo Endoplásmico , Células Epiteliales/metabolismo , Células Epiteliales/patología , Enfermedades Renales/inducido químicamente , Enfermedades Renales/metabolismo , Túbulos Renales/metabolismo , Túbulos Renales/patología , Ratones , Ratones Endogámicos BALB C , Mitocondrias/metabolismo
14.
Bioorg Med Chem Lett ; 23(1): 318-22, 2013 Jan 01.
Artículo en Inglés | MEDLINE | ID: mdl-23195733

RESUMEN

A variety of 5-, 6- and 8-(4-aminobutyloxy)quinolines as novel oxygen analogues of known 4- and 8-(4-aminobutylamino)quinoline antimalarial drugs was generated from hydroxyquinolines through a three-step approach with a rhodium-catalyzed hydroformylation as the key step. Antiplasmodial assays of these new quinolines revealed micromolar potency for all representatives against a chloroquine-sensitive strain of Plasmodium falciparum, and three compounds showed submicromolar activity against a chloroquine-resistant strain of P. falciparum with IC(50)-values ranging between 150 and 680 nM.


Asunto(s)
Antimaláricos/síntesis química , Cloroquina/análogos & derivados , Animales , Antimaláricos/química , Antimaláricos/toxicidad , Células CHO , Catálisis , Supervivencia Celular/efectos de los fármacos , Cloroquina/síntesis química , Cloroquina/toxicidad , Cricetinae , Cricetulus , Evaluación Preclínica de Medicamentos , Plasmodium falciparum/efectos de los fármacos , Rodio/química
15.
Drug Chem Toxicol ; 35(2): 184-91, 2012 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-21774738

RESUMEN

The present study was conducted to screen the efficacy of curcumin against chloroquine phosphate (CQ)-induced reproductive toxicity in adult male Swiss albino mice. Animals were given oral doses of 100, 200, 300 mg/kg body weight (b.w.), and high dose of CQ (300 mg/kg b.w.) + curcumin (80 mg/kg b.w.) for 45 days. Animals of the withdrawal group were given high dose of CQ (300 mg/kg b.w.) for 45 days and, at day 46, were kept for another 45 days. Effects were observed on some key enzymes, such as alkaline phosphatase, which was found to be decreased, whereas acid phosphatase was increased and succinate dehydrogenase and adenosine triphosphatase were decreased. Oxidative parameters, such as superoxide dismutase declined, whereas thiobarbituric acid-reactive substances were found to be elevated. Protein level was also decreased. Gravimetric indices were also recorded. Results obtained indicated adverse effects of CQ in a dose-dependent manner. The presence of curcumin with CQ alleviated its toxic effects. Hence, it can be concluded that curcumin has beneficial influences and appears able to ameliorate CQ toxicity.


Asunto(s)
Antimaláricos/toxicidad , Cloroquina/análogos & derivados , Curcumina/farmacología , Inhibidores Enzimáticos/farmacología , Testículo/efectos de los fármacos , Fosfatasa Ácida/metabolismo , Adenosina Trifosfatasas/metabolismo , Fosfatasa Alcalina/metabolismo , Animales , Cloroquina/toxicidad , Relación Dosis-Respuesta a Droga , Interacciones Farmacológicas , Masculino , Ratones , Distribución Aleatoria , Succinato Deshidrogenasa/metabolismo , Superóxido Dismutasa/metabolismo , Testículo/metabolismo , Sustancias Reactivas al Ácido Tiobarbitúrico/metabolismo
16.
J Med Chem ; 49(17): 5300-8, 2006 Aug 24.
Artículo en Inglés | MEDLINE | ID: mdl-16913719

RESUMEN

Prion diseases are invariably fatal neurodegenerative diseases, in which the infectious agent consists of PrP(Sc), a pathogenic misfolded isoform of the normal cellular prion protein (PrP(C)). Until now, no pharmacological options exist for these novel pathogens. Here we describe the screening of a series of polyquinolines and quinolines linked to a large variety of terminal groups for their ability to cure a persistently prion infected cell line (ScN2a). Several compounds showed antiprion activity in the nanomolar range. The most active molecule, named 42, had a half-effective concentration (EC50) for antiprion activity of 50 nM. In a library of quinoline derivatives we were able to identify several structure-activity relationships (SAR). Remarkably, antiprion SAR in ScN2a cells were similar to antimalarial SAR in a cell model of malaria, particularly for the sulfonamide quinoline derivatives, suggesting that some molecular targets of antiprion and antimalarial substances overlap.


Asunto(s)
Antimaláricos/farmacología , Priones/antagonistas & inhibidores , Quinolinas/farmacología , Animales , Antimaláricos/síntesis química , Antimaláricos/química , Línea Celular Tumoral , Cloroquina/análogos & derivados , Cloroquina/síntesis química , Cloroquina/farmacología , Evaluación Preclínica de Medicamentos , Ratones , Estructura Molecular , Quinolinas/síntesis química , Quinolinas/química , Estereoisomerismo , Relación Estructura-Actividad
17.
Ann Acad Med Stetin ; 52 Suppl 2: 5-10, 2006.
Artículo en Polaco | MEDLINE | ID: mdl-17471832

RESUMEN

The natural course of rheumatoid arthritis inevitably leads to joint damage and reduced life expectancy. Therefore, active treatment of rheumatoid arthritis is indispensable. Although the etiology still remains unknown resulting in unsuccessful prophylaxis and incurability of rheumatoid arthritis, learning more about its pathophysiology broadens the spectrum of therapeutic possibilities. The aim of treatment is remission of the disease. Current standards of treatment are based on the idea to start aggressive treatment as early as possible to suppress the activity of the disease. This can be achieved by pharmacotherapy and rehabilitation. Physiotherapy is supplementary but there is no room for spa treatment or alternative therapies. Treatment should be introduced immediately because the "window" for successful change in the natural course of the disease covers the first three months since onset. Diagnostic difficulties during this period support the idea of "early arthritis" and "early rheumatoid arthritis". Glycocorticosteroids at a dose suitable to suppress inflammation represent the first-line treatment. Basic therapy which usually is synonymous for methotrexate 15-25 mg once weekly should be introduced from the 4th month at the latest. In case of methotrexate intolerance, leflunomide is an alternative. Lack of efficacy of monotherapy with these drugs mandates the combination therapy of methotrexate with leflunomide, cyclosporine or sulphasalazine together with hydroxychlorochine. The use of two latter drugs should be limited due to their low efficacy. Patients refractory to combination therapy should be considered as candidates to anticytokine drugs or to lymphocyte B depleting drugs. However, it should be emphasized that their high efficacy is achieved only in combination with full doses of methotrexate. The same rules should be applied to therapeutic decisions in elderly patients and in patients with long history of rheumatoid arthritis. However, lower doses of the drugs should be used at initiation of therapy. Contraindications related to side effects and concomitant diseases should be considered. In these groups, glycocorticosteroids play a more important role and cyclophosphamide is used more frequently. Surgical treatment should be reserved for patients with advanced disease. Total joint replacement is an effective method for large joints. Synovectomy should be done only exceptionally when all options of pharmacotherapy were ineffective.


Asunto(s)
Antiinflamatorios/uso terapéutico , Antirreumáticos/uso terapéutico , Artritis Reumatoide/diagnóstico , Artritis Reumatoide/terapia , Inmunosupresores/uso terapéutico , Metotrexato/uso terapéutico , Antiinflamatorios no Esteroideos/uso terapéutico , Cloroquina/análogos & derivados , Cloroquina/uso terapéutico , Ciclosporina/uso terapéutico , Quimioterapia Combinada , Humanos , Isoxazoles/uso terapéutico , Prótesis Articulares , Leflunamida , Prótesis e Implantes , Sulfasalazina/uso terapéutico
18.
Przegl Lek ; 62(6): 501-7, 2005.
Artículo en Polaco | MEDLINE | ID: mdl-16225106

RESUMEN

Chloroquine is a derivative of 4-aminoquinoline, which is used in the malaria prophylaxis and treatment and the therapy of some connective tissue diseases. Its narrow therapeutic index causes that the medicine is relatively toxic, especially in the case of an overdose or an acute intoxication. In the recent study two cases of the acute chloroquine poisoning, hospitalized in the Toxicology Department in Kraków, were described and one of them was fatal. The first case was 16-year-old girl who ingested 5 g of chloroquine phosphate in the suicidal attempt. After about 2 hours general seizures appeared followed by ventricular fibrillation and cardiac arrest. After near 2-hour-lasted reanimation procedures she was resuscitated, but 14 hours later another cardiac arrest appeared because of the bradyasystole. Despite the institution of advanced reanimation methods including external pacemaker and electrostimulation, spontaneous circulation did not return and the patient was declared dead. Postmortem toxicological examination of blood, vitreous humour, bile and liver revealed extremely high concentrations of chloroquine (252.15 mg/l in blood). The second case was the 15-year-old girl who ingested 7.5 g of chloroquine phosphate. She developed significant hypotension requiring intravenous infusions of fluids and catecholamines and respiratory distress positively treated with endotracheal intubation and mechanical ventilation. In both cases a considerable hypokalemia and prolonged QTc interval were observed. According to the literature, a clinical picture, diagnosis and recommended therapy of an acute chloroquine poisoning were reviewed.


Asunto(s)
Antimaláricos/envenenamiento , Cloroquina/análogos & derivados , Paro Cardíaco/inducido químicamente , Intento de Suicidio , Adolescente , Cloroquina/envenenamiento , Sobredosis de Droga/complicaciones , Resultado Fatal , Femenino , Sistema de Conducción Cardíaco/efectos de los fármacos , Humanos , Hipopotasemia/inducido químicamente , Intoxicación/complicaciones , Insuficiencia Respiratoria/inducido químicamente
19.
Afr J Med Med Sci ; 33(1): 73-5, 2004 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-15490799

RESUMEN

The antimalarial activities of the methanol extracts of Striga hermonthica (whole plant) and Tapinanthus sessilifolius (leaves), commonly used in Northern Nigeria for the treatment of malaria, were evaluated. In the in vitro antiplasmodial analysis, the extracts of T. sessilifolius and S. hermonthica utilized in the study, displayed mild to weak activities with IC50 values of 200.5 and 274.8 microg/ml respectively. This was investigated, using the multidrug resistant Plasmodium falciparum, K1 strain, in the parasite lactate dehydrogenase assay. The murine model in vivo antimalarial activity of the tested extracts, using chloroquine-sensitive Plasmodium berghei (ANKA P1), in the 4-day suppressive test, showed that both plants had intrinsic antimalarial properties, that were dose-dependent. At a dose of 400mg/kg weight of mice, extract of S. hermonthica exhibited a higher intrinsic antimalarial activity (68.5 % suppression) than that of T. sessilifolius (51.3 %). Chloroquine, the standard reference drug, had an average suppression of 78.0 % at a dose of 10 mg/kg weight of mice while normal saline was used as control. Preliminary phytochemical screening of the extracts indicated the presence ofsaponins, tannins, flavonoids, volatile oils and cardiac glycosides.


Asunto(s)
Cloroquina/análogos & derivados , Loranthaceae , Malaria Falciparum/tratamiento farmacológico , Extractos Vegetales/uso terapéutico , Striga , Animales , Antimaláricos/uso terapéutico , Cloroquina/uso terapéutico , Modelos Animales de Enfermedad , Relación Dosis-Respuesta a Droga , Técnicas In Vitro , L-Lactato Deshidrogenasa/análisis , Masculino , Ratones , Hojas de la Planta , Plasmodium falciparum/efectos de los fármacos
20.
Bull Exp Biol Med ; 135 Suppl 7: 94-5, 2003 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-12949664

RESUMEN

We studied clinical and psychosomatic characteristics in 34 patients with rheumatoid arthritis. Sixteen patients received Vozraston (without considering the individual sensitivity) in addition to standard therapy. No changes in clinical and psychoemotional parameters were revealed. Vozraston reduced pain syndrome and increased the tone of the sympathetic nervous system.


Asunto(s)
Antirreumáticos/uso terapéutico , Artritis Reumatoide/tratamiento farmacológico , Materia Medica/uso terapéutico , Antiinflamatorios no Esteroideos/uso terapéutico , Artritis Reumatoide/patología , Cloroquina/análogos & derivados , Cloroquina/uso terapéutico , Humanos , Inmunosupresores/uso terapéutico , Metotrexato/uso terapéutico , Dolor/tratamiento farmacológico , Resultado del Tratamiento
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