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1.
Neurochem Res ; 48(6): 1958-1970, 2023 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-36781685

RESUMO

BT75, a boron-containing retinoid, is a novel retinoic acid receptor (RAR)α agonist synthesized by our group. Previous studies indicated that activation of retinoic acid (RA) signaling may attenuate progression of Alzheimer's disease (AD). Presently, we aimed to examine the anti-inflammatory effect of BT75 and explore the possible mechanism using cultured cells and an AD mouse model. Pretreatment with BT75 (1-25 µM) suppressed the release of nitric oxide (NO) and IL-1ß in the culture medium of mouse microglial SIM-A9 cells activated by LPS. BMS195614, an RARα antagonist, partially blocked the inhibition of NO production by BT75. Moreover, BT75 attenuated phospho-Akt and phospho-NF-κB p65 expression augmented by LPS. In addition, BT75 elevated arginase 1, IL-10, and CD206, and inhibited inducible nitric oxide synthase (iNOS) and IL-6 formation in LPS-treated SIM-A9 cells, suggesting the promotion of M1-M2 microglial phenotypic polarization. C57BL/6 mice were injected intracerebroventricularly (icv) with streptozotocin (STZ) (3 mg/kg) to provide an AD-like mouse model. BT75 (5 mg/kg) or the vehicle was intraperitoneally (ip) injected to icv-STZ mice once a day for 3 weeks. Immunohistochemical analyses indicated that GFAP-positive cells and rod or amoeboid-like Iba1-positive cells, which increased in the hippocampal fimbria of icv-STZ mice, were reduced by BT75 treatment. Western blot results showed that BT75 decreased levels of neuronal nitric oxide synthase (nNOS), GFAP, and phosphorylated Tau, and increased levels of synaptophysin in the hippocampus of icv-STZ mice. BT75 may attenuate neuroinflammation by affecting the Akt/NF-κB pathway and microglial M1-M2 polarization in LPS-stimulated SIM-A9 cells. BT75 also reduced AD-like pathology including glial activation in the icv-STZ mice. Thus, BT75 may be a promising anti-inflammatory and neuroprotective agent worthy of further AD studies.


Assuntos
Doença de Alzheimer , Microglia , Camundongos , Animais , Microglia/metabolismo , NF-kappa B/metabolismo , Doença de Alzheimer/induzido quimicamente , Doença de Alzheimer/tratamento farmacológico , Doença de Alzheimer/metabolismo , Lipopolissacarídeos/toxicidade , Proteínas Proto-Oncogênicas c-akt/metabolismo , Camundongos Endogâmicos C57BL , Anti-Inflamatórios/farmacologia , Anti-Inflamatórios/uso terapêutico
2.
Molecules ; 28(3)2023 Jan 20.
Artigo em Inglês | MEDLINE | ID: mdl-36770721

RESUMO

Dearomative borylation of coumarins and chromenes via conjugate addition represents a relatively unexplored and challenging task. To address this issue, herein, we report a new and general copper (I) catalyzed dearomative borylation process to synthesize boron-containing oxacycles. In this report, the borylation of coumarins, chromones, and chromenes comprising functional groups, such as esters, nitriles, carbonyls, and amides, has been achieved. In addition, the method generates different classes of potential boron-based retinoids, including the ones with oxadiazole and anthocyanin motifs. The borylated oxacycles can serve as suitable intermediates to generate a library of compounds.


Assuntos
Benzopiranos , Boro , Cumarínicos , Cobre , Amidas
3.
Neurochem Res ; 47(8): 2263-2277, 2022 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-35501523

RESUMO

In multiple neurodevelopmental and neurodegenerative disorders, endosomal changes correlate with changes in exosomes. We examined this linkage in the brain of mice that received cocaine injections for two weeks starting at 2.5 months of age. Cocaine caused a decrease in the number of both neuronal early and late endosomes and exosomes in the brains of male but not female mice. The response to cocaine in ovariectomized females mirrored male, demonstrating that these sex-differences in response to cocaine are driven by hormonal differences. Moreover, cocaine increased the amount of α-synuclein per exosome in the brain of females but did not affect exosomal α-synuclein content in the brain of males, a sex-difference eliminated by ovariectomy. Enhanced packaging of α-synuclein into female brain exosomes with the potential for propagation of pathology throughout the brain suggests a mechanism for the different response of females to chronic cocaine exposure as compared to males.


Assuntos
Cocaína , Exossomos , Animais , Cocaína/farmacologia , Endossomos , Feminino , Masculino , Camundongos , Neurônios/patologia , alfa-Sinucleína
4.
Bioorg Med Chem ; 63: 116748, 2022 06 01.
Artigo em Inglês | MEDLINE | ID: mdl-35453036

RESUMO

The incorporation of the "magic" boron atom has been established as an important new strategy in the field of medicinal chemistry as boron compounds have been shown to form various bonds with their biological targets. Currently, a number of boron-based drugs (e.g. bortezomib, crisaborole, and tavaborole) have been FDA approved and are in the clinic, and several other boron-containing compounds are in clinical trials. Boron-based heterocycles have an incredible potential in the ongoing quest for new therapeutic agents owing to their plethora of biological activities and useful pharmacokinetic profiles. The present perspective is intended to review the pharmacological applications of boron-based heterocycles that have been published. We have classified these compounds into groups exhibiting shared pharmacological activities and discussed their corresponding biological targets focusing mainly on the most potent therapeutic compounds.


Assuntos
Boro , Química Farmacêutica , Boro/química , Boro/farmacologia , Bortezomib
5.
Molecules ; 27(11)2022 May 25.
Artigo em Inglês | MEDLINE | ID: mdl-35684340

RESUMO

Hundreds of billions of commensal microorganisms live in and on our bodies, most of which colonize the gut shortly after birth and stay there for the rest of our lives. In animal models, bidirectional communications between the central nervous system and gut microbiota (Gut-Brain Axis) have been extensively studied, and it is clear that changes in microbiota composition play a vital role in the pathogenesis of various neurodevelopmental and neurodegenerative disorders, such as Autism Spectrum Disorder, Alzheimer's disease, Parkinson's disease, Multiple Sclerosis, Amyotrophic Lateral Sclerosis, anxiety, stress, and so on. The makeup of the microbiome is impacted by a variety of factors, such as genetics, health status, method of delivery, environment, nutrition, and exercise, and the present understanding of the role of gut microbiota and its metabolites in the preservation of brain functioning and the development of the aforementioned neurological illnesses is summarized in this review article. Furthermore, we discuss current breakthroughs in the use of probiotics, prebiotics, and synbiotics to address neurological illnesses. Moreover, we also discussed the role of boron-based diet in memory, boron and microbiome relation, boron as anti-inflammatory agents, and boron in neurodegenerative diseases. In addition, in the coming years, boron reagents will play a significant role to improve dysbiosis and will open new areas for researchers.


Assuntos
Transtorno do Espectro Autista , Microbiota , Doenças Neurodegenerativas , Probióticos , Animais , Transtorno do Espectro Autista/patologia , Boro , Encéfalo/patologia , Doenças Neurodegenerativas/patologia , Probióticos/uso terapêutico
6.
Molecules ; 27(9)2022 Apr 19.
Artigo em Inglês | MEDLINE | ID: mdl-35565972

RESUMO

A standard goal of medicinal chemists has been to discover efficient and potent drug candidates with specific enzyme-inhibitor abilities. In this regard, boron-based bioactive compounds have provided amphiphilic properties to facilitate interaction with protein targets. Indeed, the spectrum of boron-based entities as drug candidates against many diseases has grown tremendously since the first clinically tested boron-based drug, Velcade. In this review, we collectively represent the current boron-containing drug candidates, boron-containing retinoids, benzoxaboroles, aminoboronic acid, carboranes, and BODIPY, for the treatment of different human diseases.In addition, we also describe the synthesis, key structure-activity relationship, and associated biological activities, such as antimicrobial, antituberculosis, antitumor, antiparasitic, antiprotozoal, anti-inflammatory, antifolate, antidepressant, antiallergic, anesthetic, and anti-Alzheimer's agents, as well as proteasome and lipogenic inhibitors. This compilation could be very useful in the exploration of novel boron-derived compounds against different diseases, with promising efficacy and lesser side effects.


Assuntos
Boranos , Boro , Boro/química , Compostos de Boro/química , Bortezomib , Descoberta de Drogas , Inibidores Enzimáticos/farmacologia , Humanos
7.
Neurochem Res ; 46(11): 2909-2922, 2021 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-34245421

RESUMO

Cocaine is a highly addictive stimulant with diverse effects on physiology. Recent studies indicate the involvement of extracellular vesicles (EVs) secreted by neural cells in the cocaine addiction process. It is hypothesized that cocaine affects secretion levels of EVs and their cargos, resulting in modulation of synaptic transmission and plasticity related to addiction physiology and pathology. Lipids present in EVs are important for EV formation and for intercellular lipid exchange that may trigger physiological and pathological responses, including neuroplasticity, neurotoxicity, and neuroinflammation. Specific lipids are highly enriched in EVs compared to parent cells, and recent studies suggest the involvement of various lipids in drug-induced synaptic plasticity during the development and maintenance of addiction processes. Therefore, we examined interstitial small EVs isolated from the brain of mice treated with either saline or cocaine, focusing on the effects of cocaine on the lipid composition of EVs. We demonstrate that 12 days of noncontingent repeated cocaine (10 mg/kg) injections to mice, which induce locomotor sensitization, cause lipid composition changes in brain EVs of male mice as compared with saline-injected controls. The most prominent change is the elevation of GD1a ganglioside in brain EVs of males. However, cocaine does not affect the EV lipid profiles of the brain in female mice. Understanding the relationship between lipid composition in EVs and vulnerability to cocaine addiction may provide insight into novel targets for therapies for addiction.


Assuntos
Encéfalo/efeitos dos fármacos , Cocaína/toxicidade , Inibidores da Captação de Dopamina/toxicidade , Vesículas Extracelulares/efeitos dos fármacos , Metabolismo dos Lipídeos/efeitos dos fármacos , Caracteres Sexuais , Animais , Encéfalo/metabolismo , Encéfalo/patologia , Cocaína/administração & dosagem , Inibidores da Captação de Dopamina/administração & dosagem , Vesículas Extracelulares/metabolismo , Vesículas Extracelulares/patologia , Feminino , Injeções Intraperitoneais , Metabolismo dos Lipídeos/fisiologia , Masculino , Camundongos , Camundongos Endogâmicos C57BL
8.
Brain ; 142(1): 163-175, 2019 01 01.
Artigo em Inglês | MEDLINE | ID: mdl-30496349

RESUMO

In addition to being the greatest genetic risk factor for Alzheimer's disease, expression of the ɛ4 allele of apolipoprotein E can lead to cognitive decline during ageing that is independent of Alzheimer's amyloid-ß and tau pathology. In human post-mortem tissue and mouse models humanized for apolipoprotein E, we examined the impact of apolipoprotein E4 expression on brain exosomes, vesicles that are produced within and secreted from late-endocytic multivesicular bodies. Compared to humans or mice homozygous for the risk-neutral ɛ3 allele we show that the ɛ4 allele, whether homozygous or heterozygous with an ɛ3 allele, drives lower exosome levels in the brain extracellular space. In mice, we show that the apolipoprotein E4-driven change in brain exosome levels is age-dependent: while not present at age 6 months, it is detectable at 12 months of age. Expression levels of the exosome pathway regulators tumor susceptibility gene 101 (TSG101) and Ras-related protein Rab35 (RAB35) were found to be reduced in the brain at the protein and mRNA levels, arguing that apolipoprotein E4 genotype leads to a downregulation of exosome biosynthesis and release. Compromised exosome production is likely to have adverse effects, including diminishing a cell's ability to eliminate materials from the endosomal-lysosomal system. This reduction in brain exosome levels in 12-month-old apolipoprotein E4 mice occurs earlier than our previously reported brain endosomal pathway changes, arguing that an apolipoprotein E4-driven failure in exosome production plays a primary role in endosomal and lysosomal deficits that occur in apolipoprotein E4 mouse and human brains. Disruption of these interdependent endosomal-exosomal-lysosomal systems in apolipoprotein E4-expressing individuals may contribute to amyloidogenic amyloid-ß precursor protein processing, compromise trophic signalling and synaptic function, and interfere with a neuron's ability to degrade material, all of which are events that lead to neuronal vulnerability and higher risk of Alzheimer's disease development. Together, these data suggest that exosome pathway dysfunction is a previously unappreciated component of the brain pathologies that occur as a result of apolipoprotein E4 expression.


Assuntos
Apolipoproteína E4/biossíntese , Encéfalo/metabolismo , Exossomos/metabolismo , Idoso , Idoso de 80 Anos ou mais , Envelhecimento/metabolismo , Alelos , Animais , Apolipoproteína E3/genética , Apolipoproteína E4/genética , Proteínas de Ligação a DNA/biossíntese , Regulação para Baixo , Complexos Endossomais de Distribuição Requeridos para Transporte/biossíntese , Exossomos/ultraestrutura , Espaço Extracelular/metabolismo , Feminino , Genótipo , Humanos , Metabolismo dos Lipídeos , Masculino , Camundongos , Camundongos Transgênicos , Pessoa de Meia-Idade , Fatores de Transcrição/biossíntese , Proteínas rab de Ligação ao GTP/biossíntese
9.
Cereb Cortex ; 29(4): 1383-1397, 2019 04 01.
Artigo em Inglês | MEDLINE | ID: mdl-29462278

RESUMO

Reduction in parvalbumin-positive (PV+) interneurons is observed in adult mice exposed to ethanol at postnatal day 7 (P7), a late gestation fetal alcohol spectrum disorder model. To evaluate whether PV+ cells are lost, or PV expression is reduced, we quantified PV+ and associated perineuronal net (PNN)+ cell densities in barrel cortex. While PNN+ cell density was not reduced by P7 ethanol, PV cell density decreased by 25% at P90 with no decrease at P14. PNN+ cells in controls were virtually all PV+, whereas more than 20% lacked PV in ethanol-treated adult animals. P7 ethanol caused immediate apoptosis in 10% of GFP+ cells in G42 mice, which express GFP in a subset of PV+ cells, and GFP+ cell density decreased by 60% at P90 without reduction at P14. The ethanol effect on PV+ cell density was attenuated by lithium treatment at P7 or at P14-28. Thus, reduced PV+ cell density may be caused by disrupted cell maturation, in addition to acute apoptosis. This effect may be regionally specific: in the dentate gyrus, P7 ethanol reduced PV+ cell density by 70% at P14 and both PV+ and PNN+ cell densities by 50% at P90, and delayed lithium did not alleviate ethanol's effect.


Assuntos
Giro Denteado/efeitos dos fármacos , Giro Denteado/crescimento & desenvolvimento , Etanol/administração & dosagem , Matriz Extracelular/efeitos dos fármacos , Interneurônios/efeitos dos fármacos , Córtex Somatossensorial/efeitos dos fármacos , Córtex Somatossensorial/crescimento & desenvolvimento , Animais , Apoptose/efeitos dos fármacos , Contagem de Células , Matriz Extracelular/patologia , Feminino , Interneurônios/química , Interneurônios/patologia , Lítio/administração & dosagem , Masculino , Camundongos Endogâmicos C57BL , Parvalbuminas/análise
10.
BMC Infect Dis ; 19(1): 370, 2019 May 02.
Artigo em Inglês | MEDLINE | ID: mdl-31046684

RESUMO

BACKGROUND: Several inactivated enterovirus-A71 (EV-A71) vaccines are currently licensed in China; however, the development of additional EV-A71 vaccines is ongoing, necessitating extensive analysis of the molecular epidemiology of the virus worldwide. Until 2012, laboratory confirmation of EV-A71 for hand, foot, and mouth disease (HFMD) and other associated diseases had not occurred in the Philippines. Because EV-A71 has been linked with cases of acute flaccid paralysis (AFP), AFP surveillance is one strategy for documenting its possible circulation in the country. To expand current knowledge on EV-A71, molecular epidemiologic analysis and genetic characterization of EV-A71 isolates were performed in this study. METHODS: A retrospective study was performed to identify and characterize nonpolio enteroviruses (NPEVs) associated with AFP in the Philippines, and nine samples were found to be EV-A71-positive. Following characterization of these EV-A71 isolates, the complete viral protein 1 (VP1) gene was targeted for phylogenetic analysis. RESULTS: Nine EV-A71 isolates detected in 2000 (n = 2), 2002 (n = 4), 2005 (n = 2), and 2010 (n = 1) were characterized using molecular methods. Genomic regions spanning the complete VP1 region were amplified and sequenced using specific primers. Phylogenetic analysis of the full-length VP1 region identified all nine EV-A71 Philippine isolates as belonging to the genogroup C lineage, specifically the C2 cluster. The result indicated a genetic linkage with several strains isolated in Japan and Taiwan, suggesting that strains in the C2 cluster identified in the Asia-Pacific region were circulating in the Philippines. CONCLUSION: The study presents the genetic analysis of EV-A71 in the Philippines. Despite some limitations, the study provides additional genetic data on the circulating EV-A71 strains in the Asia-Pacific region, in which information on EV-A71 molecular epidemiology is incomplete. Considering that EV-A71 has a significant public health impact in the region, knowledge of its circulation in each country is important, especially for formulating vaccines covering a wide variety of strains.


Assuntos
Infecções por Enterovirus/diagnóstico , Paralisia/diagnóstico , Doença Aguda , Animais , Proteínas do Capsídeo/genética , Criança , Pré-Escolar , Enterovirus Humano A/classificação , Enterovirus Humano A/genética , Enterovirus Humano A/isolamento & purificação , Infecções por Enterovirus/virologia , Fezes/virologia , Febre Aftosa/diagnóstico , Febre Aftosa/virologia , Genótipo , Humanos , Lactente , Paralisia/virologia , Filipinas , Filogenia , RNA Viral/isolamento & purificação , RNA Viral/metabolismo , Estudos Retrospectivos
11.
Virol J ; 13: 113, 2016 06 27.
Artigo em Inglês | MEDLINE | ID: mdl-27350282

RESUMO

BACKGROUND: Human respiratory syncytial virus (HRSV) is a leading viral etiologic agent of pediatric lower respiratory infections, including bronchiolitis and pneumonia. Two antigenic subgroups, HRSV-A and B, each contain several genotypes. While viral load may vary among HRSV genotypes and affect the clinical course of disease, data are scarce regarding the actual differences among genotypes. Therefore, this study estimated and compared viral load among NA1 and ON1 genotypes of HRSV-A and BA9 of HRSV-B. ON1 is a newly emerged genotype with a 72-nucleotide duplication in the G gene as observed previously with BA genotypes in HRSV-B. FINDINGS: Children <5 years of age with an initial diagnosis of severe or very severe pneumonia at a hospital in the Philippines from September 2012 to December 2013 were enrolled. HRSV genotypes were determined and the viral load measured from nasopharyngeal swabs (NPS). The viral load of HRSV genotype NA1 were significantly higher than those of ON1 and BA9. Regression analysis showed that both genotype NA1 and younger age were significantly associated with high HRSV viral load. CONCLUSIONS: The viral load of NA1 was higher than that of ON1 and BA9 in NPS samples. HRSV genotypes may be associated with HRSV viral load. The reasons and clinical impacts of these differences in viral load among HRSV genotypes require further evaluation.


Assuntos
Infecções por Vírus Respiratório Sincicial/virologia , Vírus Sincicial Respiratório Humano/isolamento & purificação , Carga Viral , Adolescente , Criança , Pré-Escolar , Feminino , Genótipo , Hospitalização , Humanos , Masculino , Filipinas/epidemiologia , Filogenia , Infecções por Vírus Respiratório Sincicial/epidemiologia , Vírus Sincicial Respiratório Humano/classificação , Vírus Sincicial Respiratório Humano/genética , Vírus Sincicial Respiratório Humano/fisiologia
12.
J Lipid Res ; 56(8): 1434-48, 2015 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-26063460

RESUMO

Our previous studies have shown accumulation of GM2 ganglioside during ethanol-induced neurodegeneration in the developing brain, and GM2 elevation has also been reported in other brain injuries and neurodegenerative diseases. Using GM2/GD2 synthase KO mice lacking GM2/GD2 and downstream gangliosides, the current study explored the significance of GM2 elevation in WT mice. Immunohistochemical studies indicated that ethanol-induced acute neurodegeneration in postnatal day 7 (P7) WT mice was associated with GM2 accumulation in the late endosomes/lysosomes of both phagocytic microglia and increased glial fibrillary acidic protein (GFAP)-positive astrocytes. However, in KO mice, although ethanol induced robust neurodegeneration and accumulation of GD3 and GM3 in the late endosomes/lysosomes of phagocytic microglia, it did not increase the number of GFAP-positive astrocytes, and the accumulation of GD3/GM3 in astrocytes was minimal. Not only ethanol, but also DMSO, induced GM2 elevation in activated microglia and astrocytes along with neurodegeneration in P7 WT mice, while lipopolysaccharide, which did not induce significant neurodegeneration, caused GM2 accumulation mainly in lysosomes of activated astrocytes. Thus, GM2 elevation is associated with activation of microglia and astrocytes in the injured developing brain, and GM2, GD2, or other downstream gangliosides may regulate astroglial responses in ethanol-induced neurodegeneration.


Assuntos
Encéfalo/citologia , Encéfalo/crescimento & desenvolvimento , Gangliosídeos/metabolismo , Técnicas de Inativação de Genes , N-Acetilgalactosaminiltransferases/deficiência , N-Acetilgalactosaminiltransferases/genética , Neuroglia/citologia , Animais , Astrócitos/citologia , Astrócitos/efeitos dos fármacos , Astrócitos/metabolismo , Dimetil Sulfóxido/farmacologia , Endossomos/efeitos dos fármacos , Endossomos/metabolismo , Etanol/farmacologia , Proteína Glial Fibrilar Ácida , Lipopolissacarídeos/farmacologia , Lisossomos/efeitos dos fármacos , Lisossomos/metabolismo , Camundongos , Camundongos Endogâmicos C57BL , Microglia/citologia , Microglia/efeitos dos fármacos , Microglia/metabolismo , Proteínas do Tecido Nervoso/metabolismo , Neuroglia/efeitos dos fármacos , Neuroglia/metabolismo , Neurônios/citologia , Neurônios/efeitos dos fármacos , Neurônios/metabolismo , Polipeptídeo N-Acetilgalactosaminiltransferase
14.
J Clin Microbiol ; 53(3): 847-58, 2015 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-25552361

RESUMO

From November 2009 to December 2013 in the Philippines, 15 influenza C viruses were isolated, using MDCK cells, from specimens obtained from children with severe pneumonia and influenza-like illness (ILI). This is the first report of influenza C virus isolation in the Philippines. In addition, from January 2008 to December 2013, 7 influenza C viruses were isolated from specimens that were obtained from children with acute respiratory illness (ARI) in Sendai city, Japan. Antigenic analysis with monoclonal antibodies to the hemagglutinin-esterase (HE) glycoprotein showed that 19 strains (12 from the Philippines and 7 from Japan) were similar to the influenza C virus reference strain C/Sao Paulo/378/82 (SP82). Phylogenetic analysis of the HE gene showed that the strains from the Philippines and Japan formed distinct clusters within an SP82-related lineage. The clusters that included the Philippine and Japanese strains were shown to have diverged from a common ancestor around 1993. In addition, phylogenetic analysis of the internal genes showed that all strains isolated in the Philippines and Japan had emerged through reassortment events. The composition of the internal genes of the Philippine strains was different from that of the Japanese strains, although all strains were classified into an SP82-related lineage by HE gene sequence analysis. These observations suggest that the influenza C viruses analyzed here had emerged through different reassortment events; however, the time and place at which the reassortment events occurred were not determined.


Assuntos
Gammainfluenzavirus/classificação , Gammainfluenzavirus/isolamento & purificação , Variação Genética , Influenza Humana/virologia , Adolescente , Criança , Pré-Escolar , Análise por Conglomerados , Evolução Molecular , Feminino , Glicoproteínas de Hemaglutininação de Vírus da Influenza/genética , Humanos , Lactente , Recém-Nascido , Gammainfluenzavirus/genética , Japão , Masculino , Dados de Sequência Molecular , Filipinas , Filogenia , Estudos Prospectivos , Vírus Reordenados/classificação , Vírus Reordenados/genética , Vírus Reordenados/isolamento & purificação , Análise de Sequência de DNA
15.
J Virol ; 88(5): 2374-84, 2014 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-24371050

RESUMO

UNLABELLED: Increased detection of enterovirus 68 (EV68) among patients with acute respiratory infections has been reported from different parts of the world in the late 2000s since its first detection in pediatric patients with lower-respiratory-tract infections in 1962. However, the underlying molecular mechanisms for this trend are still unknown. We therefore aimed to study the antigenicity and receptor binding properties of EV68 detected in recent years in comparison to the prototype strain of EV68, the Fermon strain. We first performed neutralization (NT) and hemagglutination inhibition (HI) tests using antisera generated for EV68 strains detected in recent years. We found that the Fermon strain had lower HI and NT titers than recently detected EV68 strains. The HI and NT titers were also significantly different between strains of different genetic lineages among recently detected EV68 strains. We further studied receptor binding specificities of EV68 strains for sialyloligosaccharides using glycan array analysis. In glycan array analysis, all tested EV68 strains showed affinity for α2-6-linked sialic acids (α2-6 SAs) compared to α2-3 SAs. Our study demonstrates that emergence of strains with different antigenicity is the possible reason for the increased detection of EV68 in recent years. Additionally, we found that EV68 preferably binds to α2-6 SAs, which suggests that EV68 might have affinity for the upper respiratory tract. IMPORTANCE: Numbers of cases of enterovirus 68 (EV68) infection in different parts of the world increased significantly in the late 2000s. We studied the antigenicity and receptor binding properties of recently detected EV68 strains in comparison to the prototype strain of EV68, Fermon. The hemagglutination inhibition (HI) and neutralization (NT) titers were significantly different between strains of different genetic lineages among recently detected EV68 strains. We further studied receptor binding specificities of EV68 strains for sialyloligosaccharides using glycan array analysis, which showed affinity for α2-6-linked sialic acids (α2-6 SAs) compared to α2-3 SAs. Our study suggested that the emergence of strains with different antigenicities was the possible reason for the increased detections of EV68 in recent years. Additionally, we revealed that EV68 preferably binds to α2-6 SAs. This is the first report describing the properties of EV68 receptor binding to the specific types of sialic acids.


Assuntos
Infecções por Enterovirus/diagnóstico , Enterovirus/fisiologia , Infecções Respiratórias/diagnóstico , Infecções Respiratórias/virologia , Aglutinação , Sequência de Aminoácidos , Animais , Proteínas do Capsídeo/química , Proteínas do Capsídeo/genética , Criança , Pré-Escolar , Códon , Enterovirus/classificação , Eritrócitos/metabolismo , Testes de Inibição da Hemaglutinação , Humanos , Dados de Sequência Molecular , Neuraminidase/metabolismo , Testes de Neutralização , Oligossacarídeos/metabolismo , Seleção Genética , Alinhamento de Sequência
16.
Brain ; 137(Pt 12): 3300-18, 2014 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-25270989

RESUMO

Autophagy, the major lysosomal pathway for the turnover of intracellular organelles is markedly impaired in neurons in Alzheimer's disease and Alzheimer mouse models. We have previously reported that severe lysosomal and amyloid neuropathology and associated cognitive deficits in the TgCRND8 Alzheimer mouse model can be ameliorated by restoring lysosomal proteolytic capacity and autophagy flux via genetic deletion of the lysosomal protease inhibitor, cystatin B. Here we present evidence that macroautophagy is a significant pathway for lipid turnover, which is defective in TgCRND8 brain where lipids accumulate as membranous structures and lipid droplets within giant neuronal autolysosomes. Levels of multiple lipid species including several sphingolipids (ceramide, ganglioside GM3, GM2, GM1, GD3 and GD1a), cardiolipin, cholesterol and cholesteryl esters are elevated in autophagic vacuole fractions and lysosomes isolated from TgCRND8 brain. Lipids are localized in autophagosomes and autolysosomes by double immunofluorescence analyses in wild-type mice and colocalization is increased in TgCRND8 mice where abnormally abundant GM2 ganglioside-positive granules are detected in neuronal lysosomes. Cystatin B deletion in TgCRND8 significantly reduces the number of GM2-positive granules and lowers the levels of GM2 and GM3 in lysosomes, decreases lipofuscin-related autofluorescence, and eliminates giant lipid-containing autolysosomes while increasing numbers of normal-sized autolysosomes/lysosomes with reduced content of undigested components. These findings have identified macroautophagy as a previously unappreciated route for delivering membrane lipids to lysosomes for turnover, a function that has so far been considered to be mediated exclusively through the endocytic pathway, and revealed that autophagic-lysosomal dysfunction in TgCRND8 brain impedes lysosomal turnover of lipids as well as proteins. The amelioration of lipid accumulation in TgCRND8 by removing cystatin B inhibition on lysosomal proteases suggests that enhancing lysosomal proteolysis improves the overall environment of the lysosome and its clearance functions, which may be possibly relevant to a broader range of lysosomal disorders beyond Alzheimer's disease.


Assuntos
Autofagia/fisiologia , Encéfalo/metabolismo , Metabolismo dos Lipídeos/fisiologia , Lisossomos/metabolismo , Doença de Alzheimer/patologia , Amiloide/metabolismo , Animais , Autofagia/genética , Encéfalo/patologia , Modelos Animais de Doenças , Feminino , Masculino , Camundongos , Camundongos Transgênicos , Neurônios/metabolismo , Proteólise
17.
BMC Vet Res ; 11: 11, 2015 Jan 27.
Artigo em Inglês | MEDLINE | ID: mdl-25622684

RESUMO

BACKGROUND: Hepatitis E virus (HEV) infection is a significant public health concern in Asia, and swine is an important source of sporadic HEV infection in human. However, no epidemiological data are available regarding HEV infection among the swine or human population in the Philippines. To assess the HEV infection status among pigs in rural areas, we investigated the molecular characteristics and seroprevalence of HEV among household-raised pigs in San Jose, Tarlac Province, the Philippines. RESULT: Serum and rectal swab samples were collected from 299 pigs aged 2-24 months from 155 households in four barangays (villages) between July 2010 and June 2011. Enzyme-linked immunosorbent assay (ELISA) revealed that 50.3% [95% confidence interval (CI) 44.5-56.2%] and 22.9% (95% CI 18.2-28.1%) of pigs tested positive for anti-HEV IgG and IgM, respectively. HEV RNA was detected in the feces of 22 pigs (7.4%, 95% CI 4.7-10.9%). A total of 103 households (66.5%, 95% CI 58.4-73.8%) had at least one pig that tested positive for anti-HEV IgG or IgM or HEV RNA. The prevalence of anti-HEV IgG and IgM in breeding pig (8-24 months) were higher than that in growing pigs (2-4 months) (p < 0.0001 and p = 0.008, respectively). HEV RNA was more frequently detected in 2-4-month-old pigs (9.2%, 95% CI 5.4-14.6%) than in ≥5-month-old pigs (4.8%, 95% CI 1.1-8.5%) without statistical significance (p = 0.142). HEV RNA showed 0-27.6% nucleotide difference at the partial ORF2 gene among the detected viruses, and a majority of them belonged to subtype 3a (20/22, 90.9%). CONCLUSION: We found a high prevalence of HEV antibodies in the household-raised pig population in rural areas of the Philippines, which indicates the potential risk of HEV infection among local residents. Only genotype 3 of HEV was observed, and genetically diverse strains of HEV were found to be circulating in pigs in this study.


Assuntos
Vírus da Hepatite E/isolamento & purificação , Hepatite E/veterinária , Doenças dos Suínos/virologia , Animais , Hepatite E/epidemiologia , Hepatite E/virologia , Vírus da Hepatite E/genética , Imunoglobulina G/sangue , Imunoglobulina M/sangue , Filipinas/epidemiologia , Filogenia , RNA Viral/isolamento & purificação , Estudos Soroepidemiológicos , Suínos , Doenças dos Suínos/epidemiologia
18.
Clin Exp Nephrol ; 19(6): 1079-89, 2015 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-25749830

RESUMO

BACKGROUND: Albuminuria is a biomarker for chronic kidney disease and an independent predictor of cardiovascular and all-cause mortality. A recent meta-analysis concluded that these risks increase with urinary albumin concentration, even when below the microalbuminuria threshold. Thus, minimizing urinary albumin may be a valuable therapeutic goal regardless of disease status. METHODS: We investigated the benefits and safety of a 12-week lifestyle modification program including diet and combined aerobic and resistance exercise for reducing albuminuria in 295 normoalbuminuric or microalbuminuric Japanese adults, including 30 with type 2 diabetes mellitus (T2DM), 104 with metabolic syndrome (MS), and 145 with hypertension (HT). RESULTS: In the study population, the urinary albumin:creatinine ratio (UACR) was reduced significantly (ΔUACR -3.8 ± 16.8 mg/g, P < 0.001) with no change in estimated glomerular filtration rate (eGFR) (ΔeGFR -0.4 ± 7.4 mL/min/1.73 m(2), P = 0.343). The reduction in UACR was associated with decreased fasting plasma glucose (P < 0.05). The UACR was also reduced in the T2DM, MS, and HT groups with no change in eGFR. Reduced UACR was associated with decreased fasting plasma glucose in the MS group and decreased systolic blood pressure in the HT group. The UACR was also reduced in 46 subjects using renin-angiotensin system inhibitors with no change in eGFR. CONCLUSIONS: Our 12-week lifestyle modification program reduced UACR, maintained eGFR, and improved multiple fitness findings in Japanese subjects including T2DM, MS, and HT patients.


Assuntos
Albuminúria/terapia , Diabetes Mellitus Tipo 2/terapia , Terapia por Exercício/métodos , Estilo de Vida , Adulto , Idoso , Albuminúria/complicações , Albuminúria/dietoterapia , Biomarcadores , Glicemia/metabolismo , Diabetes Mellitus Tipo 2/dietoterapia , Exercício Físico , Terapia por Exercício/efeitos adversos , Feminino , Taxa de Filtração Glomerular , Humanos , Hipertensão/dietoterapia , Hipertensão/terapia , Japão , Masculino , Síndrome Metabólica/dietoterapia , Síndrome Metabólica/terapia , Pessoa de Meia-Idade , Segurança do Paciente , Treinamento Resistido/efeitos adversos , Resultado do Tratamento , Adulto Jovem
19.
Pediatr Int ; 57(2): 321-3, 2015 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-25868952

RESUMO

We describe a novel mutation in DCX in a family in which a proband boy had classical lissencephaly and his mother had extremely mild subcortical band heterotopia. No factors that would make the mother's symptoms milder, such as somatic mosaicism or skewed X chromosome inactivation, were observed. From this family, we conclude that a DCX mutation causes a pleiotropic phenotype in the female even if X chromosome inactivation pattern is not skewed, and the novel missense mutation in DCX produced relatively mild dysfunction of the doublecortin protein.


Assuntos
Encéfalo/patologia , Lissencefalias Clássicas e Heterotopias Subcorticais em Banda/genética , Proteínas Associadas aos Microtúbulos/genética , Mutação , Neuropeptídeos/genética , Adulto , Pré-Escolar , Proteínas do Domínio Duplacortina , Proteína Duplacortina , Feminino , Testes Genéticos , Humanos , Imageamento por Ressonância Magnética , Masculino , Mães , Fenótipo
20.
Neurosci Biobehav Rev ; 158: 105567, 2024 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-38309498

RESUMO

Prenatal alcohol exposure is the leading nongenetic cause of human intellectual impairment. The long-term impacts of prenatal alcohol exposure on health and well-being are diverse, including neuropathology leading to behavioral, cognitive, and emotional impairments. Additionally negative effects also occur on the physiological level, such as the endocrine, cardiovascular, and immune systems. Among these diverse impacts is sleep disruption. In this review, we describe how prenatal alcohol exposure affects sleep, and potential mechanisms of those effects. Furthermore, we outline the evidence that sleep disruption across the lifespan may be a mediator of some cognitive and behavioral impacts of developmental alcohol exposure, and thus may represent a promising target for treatment.


Assuntos
Transtornos do Espectro Alcoólico Fetal , Efeitos Tardios da Exposição Pré-Natal , Feminino , Humanos , Gravidez , Transtornos do Espectro Alcoólico Fetal/etiologia , Etanol/efeitos adversos , Sono
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