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1.
Colloids Surf B Biointerfaces ; 238: 113901, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38608466

RESUMO

Increased glycine concentrations are associated with altered metabolism of cancer cells and is reflected in the bodily fluids of the brain cancer patients. Various studies have been conducted in past to detect glycine as an imaging biomarker via NMR Spectroscopy tools. However, the use is limited because of the low concentration and different in vivo detection due to overlapping of peaks with myo-inositol in same spectral position. Alongside, little is known about the electrochemical potential of Glycine as a biomarker for brain cancer. The prime impetus of this study was to check the feasibility of glycine as non-invasive biomarker for brain cancer. A divergent approach to detect glycine "non-enzymatically" via unique chitosan lecithin nanocomposite has been utilised during this study. The electrochemical inactivity at provided potential that prevented glycine to get oxidized or reduced without mediator was compensated utilising the chitosan-lecithin nanocomposite. Thus, a redox mediator (Prussian blue) was used for high sensitivity and indirect detection of glycine. The chitosan nanoparticles-lecithin nanocomposite is used as a matrix. The electrochemical analysis of the onco-metabolomic biomarker (glycine) utilizing cyclic voltammetry in glycine spiked multi-Purpose artificial urine was performed to check distribution of glycine over physiological range of glycine. A wide linear range of response varying over the physiological range from 7 to 240 µM with a LOD 8.5 µM was obtained, showing potential of detection in biological samples. We have further evaluated our results via simulating the interaction of mediator and matrix with Glycine by HOMO-LUMO band fluctuations.


Assuntos
Técnicas Biossensoriais , Quitosana , Técnicas Eletroquímicas , Glicina , Lecitinas , Nanocompostos , Glicina/química , Quitosana/química , Nanocompostos/química , Técnicas Biossensoriais/métodos , Técnicas Eletroquímicas/métodos , Humanos , Lecitinas/química , Tamanho da Partícula
2.
Biochimie ; 221: 110-124, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38311199

RESUMO

l-cysteine, a primary building block of mycothiol, plays an essential role in the defense mechanism of Mycobacterium tuberculosis (Mtb). However, it is unclear how Mtb regulates cysteine biosynthesis as no study has reported the cysteine regulatory complex (CRC) in Mtb. Serine acetyltransferase (SAT) and cysteine synthase (CS) interact to form CRC. Although MtCS has been characterized well, minimal information is available on MtSAT, which synthesizes, O-acetylserine (OAS), the precursor of cysteine. This study fills the gap and provides experimental evidence for the presence of MtCRC and a non-canonical multi-oligomeric MtSAT. We employed multiple analytical methods to characterize the oligomeric and kinetic properties of MtSAT and MtCRC. Results show that MtSAT, lacking >75 N-terminal amino acids exists in three different assembly states; trimer, hexamer, and dodecamer, compared to the single hexameric state of SAT of other bacteria. While hexamers display the highest catalytic turnover, the trimer is the least active. The predominance of trimers at low physiologically relevant concentrations suggests that MtSAT displays the lowest catalytic potential known. Further, the catalytic potential of MtSAT is also significantly reduced in CRC state, in contrast to enhanced activity of SAT in CRC of other organisms. Our study provides insights into multi-oligomeric MtSAT with reduced catalytic potential and demonstrates that both MtSAT and MtCS of Mycobacterium interact to form CRC, although with altered catalytic properties. We discuss our results in light of the altered biochemistry of the last step of canonical sulfate-dependent cysteine biosynthesis of Mycobacterium.


Assuntos
Proteínas de Bactérias , Cisteína Sintase , Cisteína , Mycobacterium tuberculosis , Serina O-Acetiltransferase , Mycobacterium tuberculosis/enzimologia , Mycobacterium tuberculosis/genética , Serina O-Acetiltransferase/metabolismo , Serina O-Acetiltransferase/genética , Serina O-Acetiltransferase/química , Cisteína/metabolismo , Proteínas de Bactérias/metabolismo , Proteínas de Bactérias/genética , Proteínas de Bactérias/química , Cisteína Sintase/metabolismo , Cisteína Sintase/genética , Multimerização Proteica , Cinética
3.
Leuk Res ; 134: 107392, 2023 11.
Artigo em Inglês | MEDLINE | ID: mdl-37774447

RESUMO

Acute Promyelocytic Leukemia (APL) is associated with excellent long-term outcomes. However, early mortality due to coagulopathy remains a challenge. In this study we examined the bleeding and thrombotic manifestations, as well as incidence of Early Death secondary to thrombosis/hemorrhage (ED-TH) in patients with APL. Early death (ED) was defined as death occurring within 30 days of induction therapy. Two-hundred forty-eight patients were included in the study. Overall, 57 patients had evidence of a major bleed/thrombosis at presentation or during induction therapy, including 44 patients with a major bleed, 8 patients with thrombosis and 5 patients with both evidence of thrombosis and a major bleed. Forty patients (16.1%) had ED, of which 21 had ED-TH. The cumulative incidence of death due to thrombo-hemorrhagic complications at 30 days was 8.4%. On univariate analysis, increasing Prothrombin time (PT)(p-<0.001), white blood cell count (p < 0.001) and activated Partial thromboplastin time (aPTT) (p < 0.001) were statistically significantly associated with increased risk of ED-TH. However, on multivariate analysis, only increasing PT (p-0.025) and aPTT (p-0.041) were significantly associated with increased risk of ED-TH.


Assuntos
Leucemia Promielocítica Aguda , Trombose , Humanos , Leucemia Promielocítica Aguda/complicações , Leucemia Promielocítica Aguda/tratamento farmacológico , Trióxido de Arsênio/efeitos adversos , Tretinoína , Hemorragia/induzido quimicamente , Hemorragia/complicações , Trombose/complicações , Protocolos de Quimioterapia Combinada Antineoplásica/efeitos adversos
4.
Cancer Metastasis Rev ; 42(3): 847-889, 2023 09.
Artigo em Inglês | MEDLINE | ID: mdl-37204562

RESUMO

Cancer is one of the life-threatening diseases accountable for millions of demises globally. The inadequate effectiveness of the existing chemotherapy and its harmful effects has resulted in the necessity of developing innovative anticancer agents. Thiazolidin-4-one scaffold is among the most important chemical skeletons that illustrate anticancer activity. Thiazolidin-4-one derivatives have been the subject of extensive research and current scientific literature reveals that these compounds have shown significant anticancer activities. This manuscript is an earnest attempt to review novel thiazolidin-4-one derivatives demonstrating considerable potential as anticancer agents along with a brief discussion of medicinal chemistry-related aspects of these compounds and structural activity relationship studies in order to develop possible multi-target enzyme inhibitors. Most recently, various synthetic strategies have been developed by researchers to get various thiazolidin-4-one derivatives. In this review, the authors highlight the various synthetic, green, and nanomaterial-based synthesis routes of thiazolidin-4-ones as well as their role in anticancer activity by inhibition of various enzymes and cell lines. The detailed description of the existing modern standards in the field presented in this article may be interesting and beneficial to the scientists for further exploration of these heterocyclic compounds as possible anticancer agents.


Assuntos
Antineoplásicos , Neoplasias , Humanos , Neoplasias/tratamento farmacológico , Antineoplásicos/farmacologia , Antineoplásicos/uso terapêutico , Antineoplásicos/química , Relação Estrutura-Atividade
5.
Br J Haematol ; 201(2): 249-255, 2023 04.
Artigo em Inglês | MEDLINE | ID: mdl-36529704

RESUMO

Arsenic trioxide (ATO) and all-trans retinoic acid (ATRA) form the backbone of the treatment of acute promyelocytic leukaemia (APL), with the addition of chemotherapy for high-risk patients. We describe our experience of treating patients with APL of all risk classes with ATO and ATRA without chemotherapeutic agents. Patients received induction with ATO and ATRA followed by three cycles of consolidation with ATO and ATRA (each 1 month apart) after achieving morphological remission. Patients with intermediate- and high-risk disease received a further 2 years of maintenance with ATRA, 6-mercaptopurine and methotrexate. A total of 206 patients were included in the study. The majority of the patients were intermediate risk (51.9%), followed by high risk (43.2%). Differentiation syndrome was seen in 41 patients (19.9%). Overall, 25 patients (12.1%) died within 7 days of initiating therapy. Seven patients relapsed during follow-up. The mean (SD) estimated 5-year event-free survival (EFS) and overall survival (OS) in the entire cohort was 79% [5.8%] and 80% [5.8%] respectively. After excluding patients who died within 7 days of therapy initiation, the mean (SD) estimated 5-year EFS and OS was 90% [5.8%] and 93% [3.9%] respectively. Our study shows that treatment of all risk classes of APL with ATO and ATRA without chemotherapy is associated with excellent long-term outcomes in the real-world setting.


Assuntos
Trióxido de Arsênio , Leucemia Promielocítica Aguda , Tretinoína , Humanos , Protocolos de Quimioterapia Combinada Antineoplásica/efeitos adversos , Trióxido de Arsênio/uso terapêutico , Arsenicais/efeitos adversos , Óxidos/efeitos adversos , Estudos Retrospectivos , Resultado do Tratamento , Tretinoína/uso terapêutico
6.
Curr Drug Res Rev ; 15(2): 105-121, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-36321239

RESUMO

Piperine is a fascinating substance since it can be used as a biomarker in combination with other bioactive compounds or their analogues, as well as therapeutic molecules used for the healing of a variety of diseases. It displays a plentiful therapeutic potential and various health benefits when administered alone or in combination with several other drugs and/or phytochemicals. It has also been used to enhance the pharmacokinetic profile of many nutraceutical compounds like curcumin, resveratrol, quercetin, beta-carotene, barbiturates, propranolol, metformin, theophylline etc. The present review discloses the synergistic effect of piperine and its derivatives, clinical studies, and patent studies of piperine.


Assuntos
Alcaloides , Humanos , Alcaloides/farmacologia , Alcamidas Poli-Insaturadas/farmacologia , Teofilina , Piperidinas/farmacologia
8.
Cancer Treat Res Commun ; 29: 100465, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34598060

RESUMO

The Theranostics approach has full potential to completely transform the contemporary medicine system to a patient-centric approach, as it is emerging in quite efficient manner, over the past few years. The primary impetus of this review is to analyse the patent growth in the domain of breast cancer theranostics. This wholesome analysis provides an insight into the current technological and R & D advancement over the years, in breast cancer theranostics. Thus, guide the end-users in getting the conclusion for policymaking and other public recommendations. This patent assessment also foretells about the future trends to carry out further achievements. Due to their easy availability, information richness, & versatility, patent's role in R&D policy has been emphasized by stake holders of innovation including scientists time to time. Graphical Abstract: The figure illustrates the applied technologies used for breast cancer theranostics by top three forward cited patents (A) The oligonucleotides with specific sequences (comprised of at least one of DNA, RNA, PNA. LNA, UNA or combination)1 are capable of binding a targeted tumor protein (PARP1, HISTIHIB, HISTIHID, NCL, FBL, SFPQ, RPL12, ACTB, HIST1H4A, SSBP1, NONO, H2AFJ, and DDX21, forming a tumor protein complex or subunit or their fragments and might block the tumoral activity. These are also capable of binding to Ramos cells (Derived from Human Burkitt's lymphoma that is negative for Epstein Barr virus). These can also bind cell surface nucleolin and may inhibit cell proliferation. These molecules with detection agent detect the presence or level of disease specific protein. (B) These aptamers with chemical functionalization can be conjugated to an amine linker or high molecular weight non-immunogenic compound or a drug or cytotoxic moiety or labelled with fluorescent agent. These chemically modified aptamers can also bind disease - specific biomarkers e.g., circulating biomarkers, micro- vesicle surface antigens or their functional fragments and can be subsequently used for early diagnosis, prognosis or therapeutic purposes. 1PNA: Peptide Nucleic Acid. LNA: Locked Nucleic Acid. UNA: Unlocked Nucleic Acid.


Assuntos
Neoplasias da Mama/terapia , Nanomedicina/métodos , Nanotecnologia/métodos , Medicina de Precisão/métodos , Feminino , Humanos
9.
J Mol Biol ; 433(22): 167255, 2021 11 05.
Artigo em Inglês | MEDLINE | ID: mdl-34547327

RESUMO

Cysteine Synthase (CS), the enzyme that synthesizes cysteine, performs non-canonical regulatory roles by binding and modulating functions of disparate proteins. Beyond its role in catalysis and regulation in the cysteine biosynthesis pathway, it exerts its moonlighting effect by binding to few other proteins which possess a C-terminal "CS-binding motif", ending with a terminal ILE. Therefore, we hypothesized that CS might regulate many other disparate proteins with the "CS-binding motif". In this study, we developed an iterative sequence matching method for mapping moonlighting biochemistry of CS and validated our prediction by analytical and structural approaches. Using a minimal protein-peptide interaction system, we show that five previously unknown CS-binder proteins that participate in diverse metabolic processes interact with CS in a species-specific manner. Furthermore, results show that signatures of protein-protein interactions, including thermodynamic, competitive-inhibition, and structural features, highly match the known CS-Binder, serine acetyltransferase (SAT). Together, the results presented in this study allow us to map the extreme multifunctional space (EMS) of CS and reveal the biochemistry of moonlighting space, a subset of EMS. We believe that the integrated computational and experimental workflow developed here could be further modified and extended to study protein-specific moonlighting properties of multifunctional proteins.


Assuntos
Biologia Computacional/métodos , Cisteína Sintase/química , Cisteína Sintase/metabolismo , Azorhizobium/genética , Sítios de Ligação , Cristalografia por Raios X , Cisteína Sintase/genética , Bases de Dados de Proteínas , Fluorescência , Haemophilus influenzae/enzimologia , Histonas/química , Histonas/metabolismo , Cinética , Modelos Moleculares , Planctomycetales/enzimologia , Regiões Promotoras Genéticas , Conformação Proteica , Mapas de Interação de Proteínas , Ribossomos/química , Ribossomos/metabolismo , Especificidade da Espécie , Fatores de Transcrição/química , Fatores de Transcrição/genética , Fatores de Transcrição/metabolismo
10.
Chemosphere ; 275: 129856, 2021 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-33636519

RESUMO

With the increase in the world's population, demand for food and other products is continuously rising. This has put a lot of pressure on the agricultural sector. To fulfill these demands, the utilization of chemical fertilizers and pesticides has also increased. Consequently, to overcome the adverse effects of agrochemicals on our environment and health, there has been a shift towards organic fertilizers or other substitutes, which are ecofriendly and help to maintain a sustainable environment. Microalgae have a very high potential of carbon dioxide (CO2) capturing and thus, help in mitigating the greenhouse effect. It is the most productive biological system for generating biomass. The high growth rate and higher photosynthetic efficiency of the algal species compared to the terrestrial plants make them a wonderful alternative towards a sustainable environment. Moreover, they could be cultivated in photobioreactors or open ponds, which in turn reduce the demand for arable land. Biochar derived from algae is high in nutrients and exhibits the property of ion exchange. Therefore, it can be utilized for sustainable agriculture by partial substituting the chemical fertilizers that degrade the fertility of the soil in the long run. This review provides a detailed insight on the properties of algal biochar as a potential fertilizer for sustainable agriculture. Application of algal biochar in bio-refinery and its economic aspects, challenges faced and future perspective are also discusses in this study.


Assuntos
Gases de Efeito Estufa , Agricultura , Dióxido de Carbono/análise , Sequestro de Carbono , Carvão Vegetal , Fertilizantes , Solo
11.
J Biol Chem ; 296: 100041, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33162395

RESUMO

O-acetyl serine sulfhydrylase (OASS), referred to as cysteine synthase (CS), synthesizes cysteine from O-acetyl serine (OAS) and sulfur in bacteria and plants. The inherent challenge for CS is to overcome 4 to 6 log-folds stronger affinity for its natural inhibitor, serine acetyltransferase (SAT), as compared with its affinity for substrate, OAS. Our recent study showed that CS employs a novel competitive-allosteric mechanism to selectively recruit its substrate in the presence of natural inhibitor. In this study, we trace the molecular features that control selective substrate recruitment. To generalize our findings, we used CS from three different bacteria (Haemophilus, Salmonella, and Mycobacterium) as our model systems and analyzed structural and substrate-binding features of wild-type CS and its ∼13 mutants. Results show that CS uses a noncatalytic residue, M120, located 20 Šaway from the reaction center, to discriminate in favor of substrate. M120A and background mutants display significantly reduced substrate binding, catalytic efficiency, and inhibitor binding. Results shows that M120 favors the substrate binding by selectively enhancing the affinity for the substrate and disengaging the inhibitor by 20 to 286 and 5- to 3-folds, respectively. Together, M120 confers a net discriminative force in favor of substrate by 100- to 858-folds.


Assuntos
Cisteína Sintase/metabolismo , Regulação Alostérica , Sequência de Aminoácidos , Substituição de Aminoácidos , Catálise , Dicroísmo Circular , Cristalografia por Raios X , Cisteína Sintase/antagonistas & inibidores , Cisteína Sintase/química , Inibidores Enzimáticos/farmacologia , Cinética , Metionina/química , Conformação Proteica , Especificidade por Substrato
12.
Cell Reprogram ; 21(1): 1-10, 2019 02.
Artigo em Inglês | MEDLINE | ID: mdl-30601028

RESUMO

Spermatogonial stem cells (SSCs) self-renew and produce a large number of differentiated germ cells to maintain normal spermatogenesis. However, the growth factors crucial for SSC self-renewal and the mechanism underlying this process remain unclear. In the present study, a serum-free culture media was used to evaluate the effect of several growth factors on the expression of some SSC markers and self-renewal related genes. The putative SSCs were cultured on buffalo Sertoli cell feeder layer in KO-DMEM +10% KOSR. The colony formation was observed between 7 and 10 days. The putative SSC colonies also expressed markers specific for undifferentiated type A spermatogonia and pluripotency markers. After 15 days, relative mRNA expression study revealed that 20 ng/mL concentration of Glial cell line-derived neurotrophic factor (GDNF) upregulated the expression of PLZF, TAF4B, and THY1. Furthermore, supplementation of a combination of 20 ng/mL GDNF, 10 ng/mL basic fibroblast growth factor (bFGF), 1000 IU/mL leukemia inhibitory factor (LIF), and 1 ng/mL colony stimulating factor 1 (CSF1) upregulated the expression of PLZF, TAF4B, BCL6B, and ID4 genes. These results demonstrated that our defined culture media in combination with GDNF, bFGF, LIF, and CSF1 well supported SSC self-renewal.


Assuntos
Células-Tronco Adultas/citologia , Proliferação de Células , Meios de Cultura Livres de Soro/química , Fator 2 de Crescimento de Fibroblastos/química , Fator Neurotrófico Derivado de Linhagem de Célula Glial/química , Fator Inibidor de Leucemia/química , Fator Estimulador de Colônias de Macrófagos/química , Animais , Búfalos , Células Cultivadas , Masculino , Células de Sertoli/citologia , Espermatogênese , Fatores de Transcrição/genética , Fatores de Transcrição/metabolismo
13.
J Glob Oncol ; 4: 1-10, 2018 09.
Artigo em Inglês | MEDLINE | ID: mdl-30241224

RESUMO

PURPOSE: The introduction of tyrosine kinase inhibitors has transformed the care of patients with chronic myeloid leukemia, with survival approaching that of healthy individuals. Current-day challenges in chronic myeloid leukemia care include adherence to tyrosine kinase inhibitor therapy. We studied adherence from resource-constrained settings and tried to analyze the factors responsible for nonadherence in these individuals. We also correlated adherence to current molecular status. PATIENTS AND METHODS: This was a single-center, cross-sectional, observational study from north India. It consisted of a questionnaire-based survey in which a one-to-one interview technique was used by trained nursing staff administering the Modified Morisky Adherence Scale (MMAS-9) questionnaire. Adherence was also measured on the basis of physician's assessment. JMP 13.0.0 was used for statistical analysis. RESULTS: A total of 333 patients with a median age of 42 years were included in the study. The median BCR-ABL/ABL ratio (IS) was 0.175 (0.0 to 98.0). The mean MMAS-9 score was 11 ± 2. Adherence was seen in 54.95% on the basis of MMAS-9, whereas physician's assessment reported adherence in 90.39% of patients. Using the χ2 test, no relationship was found between the two assessment techniques. There was a significant relationship between major molecular response status and adherence by physician's assessment and MMAS-9 ( P < .001). Bivariate analysis by logistic fit showed a good relation between the MMAS-9 score and the BCR-ABL/ABL ratio (IS), χ2 (1,220) = 135.45 ( P < .001). On multivariate analysis, enrolment in the Novartis Oncology Access program (a patient assistance program) was significantly associated with adherence ( P = .012). CONCLUSION: This study highlights the lack of adherence in real-world settings and the various factors responsible. Such studies are important from a public health services perspective in various settings around the world because they may lead to corrective action being taken at the institutional level.


Assuntos
Antineoplásicos/uso terapêutico , Mesilato de Imatinib/uso terapêutico , Leucemia Mielogênica Crônica BCR-ABL Positiva/tratamento farmacológico , Adesão à Medicação/estatística & dados numéricos , Inibidores de Proteínas Quinases/uso terapêutico , Adulto , Tomada de Decisões , Feminino , Humanos , Índia , Masculino , Educação de Pacientes como Assunto , Inquéritos e Questionários , Centros de Atenção Terciária
14.
J Adolesc Young Adult Oncol ; 7(1): 120-124, 2018 02.
Artigo em Inglês | MEDLINE | ID: mdl-28829925

RESUMO

INTRODUCTION: Multiple myeloma (MM) is considered as a disease of the old with the reported median age of 60-70 years. The disease occurred a decade earlier in the Indian subcontinent. The literature on MM in adolescents and young adult (AYA) is limited. We studied the disease characteristics and outcomes of the AYA-MM in the real-world setting. PATIENTS AND METHODS: It is a retrospective single-center study conducted at a tertiary care center from North India. Records of all consecutive patients with AYA-MM (15-39 years of age) who were managed from January 1, 2010, to December 30, 2015, were reviewed. Survival was assessed from the date of start of treatment to the last follow-up date or death due to any cause. RESULTS: A total of 415 patients managed for MM were included in the study. The frequency of the AYA-MM was 9.6% (40/415) of whom 5 patients were younger than 30 years. There was male preponderance with a median age of the patients being 38 years. The main presenting features were bone pain (55%), fatigue (45%), extramedullary plasmacytomas (20%), and infections (12%) and referral from the peripheral hospital as renal dysfunction (58%). On the evaluation of patients, hypercalcemia, renal impairment, anemia, and lytic lesions were seen in 24.32%, 30%, 52.5%, and 59.25% of patients, respectively. The majority had the high-risk disease (International Staging System [ISS]-III: 75%). Only 22.5% patients were transplanted. The 3-year median overall survival of the study population was 80.21%. CONCLUSION: AYA-MM patients have a higher prevalence of extramedullary disease and high-risk disease.


Assuntos
Mieloma Múltiplo , Adolescente , Adulto , Feminino , Humanos , Masculino , Estudos Retrospectivos , Fatores de Tempo , Adulto Jovem
15.
Reprod Fertil Dev ; 29(4): 679-693, 2017 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-26595369

RESUMO

Cumulus cells provide cellular interactions and growth factors required for oogenesis. In vitro studies of oogenesis are limited primarily because of the paucity of their source, first trimester fetal gonads, and the small number of germ lineage precursor cells present within these tissues. In order to understand this obscure but vitally important process, the present study was designed to direct differentiation of embryonic stem (ES) cells into germ lineage cells. For this purpose, buffalo ES cells were differentiated, as embryoid bodies (EBs) and monolayer adherent cultures, in the presence of different concentrations of cumulus-conditioned medium (CCM; 10%, 20% and 40%) for different periods of culture (4, 8 and 14 days) to identify the optimum differentiation-inducing concentration and time. Quantitative polymerase chain reaction analysis revealed that 20%-40% CCM induced the highest expression of primordial germ cell-specific (deleted in Azoospermia- like (Dazl), dead (Asp-Glu-Ala-Asp) box polypeptide 4 (Vasa also known as DDX4) and promyelocytic leukemia zinc finger protein (Plzf)); meiotic (synaptonemal complex protein 3 (Sycp3), mutl homolog I (Mlh1), transition protein 1/2 (Tnp1/2) and protamine 2 (Prm2); spermatocyte-specific boule-like RNA binding protein (Boule) and tektin 1 (Tekt1)) and oocyte-specific growth differentiation factor 9 (Gdf9) and zona pellucida 2 /3 (Zp2/3)) genes over 8-14 days in culture. Immunocytochemical analysis revealed expression of primordial germ cell (c-KIT, DAZL and VASA), meiotic (SYCP3, MLH1 and PROTAMINE 1), spermatocyte (ACROSIN and HAPRIN) and oocyte (GDF9 and ZP4) markers in both EBs and monolayer differentiation cultures. Western blotting revealed germ lineage-specific protein expression in Day 14 EBs. The significantly lower (P<0.05) concentration of 5-methyl-2-deoxycytidine in differentiated EBs compared to undifferentiated EBs suggests that methylation erasure may have occurred. Oocyte-like structures obtained in monolayer differentiation stained positive for ZONA PELLUCIDA protein 4 and progressed through various embryo-like developmental stages in extended cultures.


Assuntos
Diferenciação Celular/fisiologia , Células do Cúmulo/citologia , Células-Tronco Embrionárias/citologia , Animais , Búfalos , Técnicas de Cultura de Células , Meios de Cultivo Condicionados , Células do Cúmulo/metabolismo , RNA Helicases DEAD-box/metabolismo , Células-Tronco Embrionárias/metabolismo , Feminino
16.
Theriogenology ; 86(3): 715-29, 2016 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-27056417

RESUMO

Testicular cells are believed to secrete various growth factors that activate signaling pathways finally leading to gametogenesis. In vitro gametogenesis is an obscure but paramountly important task primarily because of paucity of the precursor cells and first trimester gonadal tissues. To overcome these limitations for development of in vitro gametes, the present study was designed to induce differentiation of buffalo embryonic stem (ES) cells into germ lineage cells on stimulation by testicular cell-conditioned medium (TCM), on the basis of the assumption that ES cells have the intrinsic property to differentiate into any cell type and TCM would provide the necessary growth factors for differentiation toward germ cell lineage. For this purpose, buffalo ES cells were differentiated as embryoid bodies (EB) in floating cultures and as monolayer adherent cultures in different doses (10%, 20%, and 40%) of TCM for different culture intervals (4, 8, and 14 days), to identify the optimum dose-and-time period. We observed that 40% TCM dose induces highest expression of primordial germ cell-specific (DAZL, VASA, and PLZF), meiotic (SYCP3, MLH1, TNP1/2, and PRM2), spermatocyte-specific (BOULE and TEKT1), and oocyte-specific genes (GDF9 and ZP2/3) for a culture period of 14 days under both floating and adherent differentiation. Immunocytochemical analysis of EBs and adherent cultures revealed presence of primordial germ cell markers (c-KIT, DAZL, and VASA), meiotic markers (SYCP3, MLH1 and PROTAMINE1), spermatocyte markers (ACROSIN and HAPRIN), and oocyte markers (GDF9 and ZP4), indicating progression into post-meiotic gametogenesis. The detection of germ cell-specific proteins in Day 14 EBs like VASA, GDF9, and ZP4 by Western blotting further confirmed germ lineage differentiation. The significantly lower (P < 0.05) concentration of 5-methyl-2-deoxycytidine in optimally differentiated EBs is suggestive of the process of methylation erasure. Oocyte-like structures obtained in monolayer differentiation had a big nucleus and a surrounding ZP4 coat, the unique attributes of a female gamete. These oocyte-like structures, in extended cultures, showed embryonic development and progressed through two-cell, four-cell, eight-cell, morula, and blastocyst-like structures, indicative of their developmental competence. This, as per our knowledge, is first such study in higher mammals, especially farm animals, and assumes significance for its potential use in transgenic animal production, elite animal conservation and propagation, augmentation of reproductive performance in poor breeding buffalo species, and as a model for understanding human germ cell formation.


Assuntos
Búfalos/fisiologia , Diferenciação Celular/fisiologia , Linhagem da Célula/fisiologia , Células-Tronco Embrionárias/fisiologia , Oócitos/fisiologia , Espermatócitos/fisiologia , Animais , Feminino , Masculino , Oócitos/citologia , Espermatócitos/citologia , Testículo/citologia , Transcrição Gênica , Transcriptoma
17.
Contemp Clin Dent ; 6(Suppl 1): S181-7, 2015 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-26604572

RESUMO

INTRODUCTION: Oral malodor is generally ascribable to oral microbial putrefaction generating malodorous volatile sulfur compounds. The aim of the present study is to correlate organoleptic recordings with a small handheld portable volatile sulfide monitor and periodontal clinical parameters and correlate the levels of halitosis causing bacteria in plaque between baseline, 1-week, and 1-month. MATERIALS AND METHODS: A total of 20 systemically healthy subjects with self-reported halitosis were subjected to organoleptic examination and FitScan(®). Subgingival plaque samples for anaerobic culturing were harvested followed by an assessment of plaque index (PI), gingival bleeding index (GBI), and pocket probing depth. Data derived were subjected to statistical analysis using Wilcoxon signed rank test and Spearman's rank test (P < 0.05). RESULTS: No correlation was seen between organoleptic measurements and portable volatile sulfide monitor at any time interval. There was a statistically significant (P < 0.05) correlation between the scores of PI, gingival index, GBI, and myeloproliferative disease with organoleptic readings at all-time intervals. Anaerobic culture has shown to identify Fusobacterium species, Porphyromonas gingivalis, Prevotella intermedia, Tannerella forsythia. However, no correlation could be established in between total microbial load with organoleptic and FitScan(®) reading at any time interval (P < 0.05). CONCLUSION: Significant correlation could be established between organoleptic readings and periodontal parameters.

18.
Cell Reprogram ; 17(4): 306-22, 2015 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-26168169

RESUMO

We present the derivation, characterization, and pluripotency analysis of three buffalo embryonic stem cell (buESC) lines, from in vitro-fertilized, somatic cell nuclear-transferred, and parthenogenetic blastocysts. These cell lines were developed for later differentiation into germ lineage cells and elucidation of the signaling pathways involved. The cell lines were established from inner cell masses (ICMs) that were isolated manually from the in vitro-produced blastocysts. Most of the ICMs (45-55%) resulted in formation of primary colonies that were subcultured after 8-10 days, leading subsequently to the formation of three buESC lines, one from each blastocyst type. All the cell lines expressed stem cell markers, such as Alkaline Phosphatase, OCT4, NANOG, SSEA1, SSEA4, TRA-1-60, TRA-1-81, SOX2, REX1, CD-90, STAT3, and TELOMERASE. They differentiated into all three germ layers as determined by ectodermal, mesodermal, and endodermal RNA and protein markers. All of the cell lines showed equal expression of pluripotency markers as well as equivalent differentiation potential into all the three germ layers. The static suspension culture-derived embryoid bodies (EBs) showed greater expression of all the three germ layer markers as compared to hanging drop culture-derived EBs. When analyzed for germ layer marker expression, EBs derived from 15% fetal bovine serum (FBS)-based spontaneous differentiation medium showed greater differentiation across all the three germ layers as compared to those derived from Knock-Out Serum Replacement (KoSR)-based differentiation medium.


Assuntos
Blastocisto/citologia , Búfalos/embriologia , Linhagem Celular , Células-Tronco Embrionárias/citologia , Fertilização in vitro , Partenogênese , Animais , Biomarcadores , Diferenciação Celular , Células Clonais , Corpos Embrioides , Células-Tronco Embrionárias/metabolismo , Feminino , Expressão Gênica , Técnicas de Transferência Nuclear
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