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1.
Vascul Pharmacol ; 143: 106954, 2022 04.
Artigo em Inglês | MEDLINE | ID: mdl-35063655

RESUMO

Diabetic neuropathy (DN) encompasses a group of clinical or subclinical manifestations involving a dysfunction in the peripheral nervous system. The cause of the dysfunction is the development of microvascular complications related to diabetes, a disease that affects about 381 million people worldwide. Approximately 50% of patients currently diagnosed with diabetes are expected to manifest DN in the next 10 years. The diagnosis can be made clinically by establishing a good patient history and delving into the symptoms to rule out other etiologies. Treatment of DN focuses on glycemic control and the use of medications to reduce pain, including NSAIDs, antidepressants and antiepileptic drugs. The pathogenesis is of multifactorial origin, associated with various metabolic, vascular, inflammatory and neurodegenerative disorders. The three fundamental cellular alterations participating in the development of DN are chronic inflammation, endothelial dysfunction and oxidative stress. Since the combination of all three is capable of giving rise to nerve ischemia and direct axonal injury, these factors play a key role in the development of polyneuropathy. However, neuronal and microvascular changes do not occur in the same way in all patients with DN, some of whom have no detectable blood abnormalities.


Assuntos
Diabetes Mellitus , Neuropatias Diabéticas , Neuropatias Diabéticas/diagnóstico , Neuropatias Diabéticas/tratamento farmacológico , Humanos , Inflamação/complicações , Estresse Oxidativo
2.
Sci Rep ; 11(1): 8210, 2021 04 15.
Artigo em Inglês | MEDLINE | ID: mdl-33859258

RESUMO

Generation 4 of polyamidoamine dendrimer (G4-PAMAM) has several biological effects due to its tridimensional globular structure, repetitive branched amides, tertiary amines, and amino-terminal subunit groups liked to a common core. G4-PAMAM is cytotoxic due to its positive charges. However, its cytotoxicity could increase in cancer cells due to the excessive intracellular negative charges in these cells. Furthermore, this work reports G4-PAMAM chemical structural characterization using UHPLC-QTOF-MS/MS (LC-MS) by electrospray ionization to measure its population according to its positive charges. Additionally, the antiproliferative effects and intracellular localization were explored in the HMC-1 and K-562 cell lines by confocal microscopy. The LC-MS results show that G4-PAMAM generated multivalent mass spectrum values, and its protonated terminal amino groups produced numerous positive charges, which allowed us to determine its exact mass despite having a high molecular weight. Additionally, G4-PAMAM showed antiproliferative activity in the HMC-1 tumor cell line after 24 h (IC50 = 16.97 µM), 48 h (IC50 = 7.02 µM) and 72 h (IC50 = 5.98 µM) and in the K-562 cell line after 24 h (IC50 = 15.14 µM), 48 h (IC50 = 14.18 µM) and 72 h (IC50 = 9.91 µM). Finally, our results showed that the G4-PAMAM dendrimers were located in the cytoplasm and nucleus in both tumor cell lines studied.


Assuntos
Dendrímeros/farmacologia , Leucemia/tratamento farmacológico , Leucemia/metabolismo , Nylons/farmacologia , Antineoplásicos/análise , Antineoplásicos/farmacocinética , Antineoplásicos/farmacologia , Linhagem Celular Tumoral , Cromatografia Líquida , Dendrímeros/análise , Dendrímeros/farmacocinética , Ensaios de Seleção de Medicamentos Antitumorais/métodos , Humanos , Concentração Inibidora 50 , Espaço Intracelular/efeitos dos fármacos , Espaço Intracelular/metabolismo , Células K562 , Leucemia/patologia , Nylons/análise , Nylons/farmacocinética , Espectrometria de Massas por Ionização por Electrospray , Espectrometria de Massas em Tandem , Distribuição Tecidual
3.
Int J Tuberc Lung Dis ; 20(12): 1681-1688, 2016 12 01.
Artigo em Inglês | MEDLINE | ID: mdl-28000588

RESUMO

SETTING: Mexico City, Mexico. OBJECTIVE: To identify proteins synthetised by Mycobacterium tuberculosis in hypoxic culture, which resemble more closely a granuloma environment than aerobic culture, and to determine if they are recognised by antibodies from patients with active pulmonary tuberculosis (PTB). DESIGN: Soluble extracts from M. tuberculosis H37Rv cultured under aerobic or hypoxic conditions were analysed using two-dimensional polyacrylamide gel electrophoresis, and proteins over-expressed under hypoxia were identified by mass spectrometry. The presence of immunoglobulin (Ig) G, IgA and IgM antibodies against these proteins was determined in the serum of 42 patients with active PTB and 42 healthy controls. RESULTS: We selected three M. tuberculosis H37Rv proteins (alpha-crystallin protein [Acr, Rv2031c], universal stress protein Rv2623 and isocitrate lyase [ICL, RV0467]) that were over-expressed under hypoxia. Titres of anti-Acr and anti-ICL IgA antibodies were higher in patients than in healthy controls, with an area under the receiver operating characteristic curve of 0.71 for anti-ICL IgA antibodies. CONCLUSION: ICL could be used in combination with other M. tuberculosis antigens to improve the sensitivity and specificity of current serological TB diagnostic methods.


Assuntos
Anticorpos Antibacterianos/sangue , Imunoglobulina A/sangue , Isocitrato Liase/imunologia , Tuberculose Pulmonar/diagnóstico , alfa-Cristalinas/imunologia , Adulto , Idoso , Antígenos de Bactérias/sangue , Estudos de Casos e Controles , Feminino , Humanos , Imunoglobulina G/sangue , Imunoglobulina M/sangue , Masculino , México , Pessoa de Meia-Idade , Mycobacterium tuberculosis/isolamento & purificação , Sensibilidade e Especificidade , Tuberculose Pulmonar/sangue , Adulto Jovem
4.
Med Hypotheses ; 70(3): 657-60, 2008.
Artigo em Inglês | MEDLINE | ID: mdl-17720327

RESUMO

Probiotics are microorganisms that have demonstrated beneficial effects on human health. Probiotics are usually isolated from the commensal microflora that inhabits the skin and mucosas. We propose that probiotics represent the species of microorganisms that have established a symbiotic relationship with humans for the longest time. Cultural practices of ancient human societies used to favor that symbiosis and the transmission of probiotics from generation to generation. New practices, introduced as a result of industrialization, such as childbirth by surgical delivery, ingestion of pasteurized and synthetic compounds-supplemented food, cleaner homes, indiscriminate use of antibiotics and so on, have led in recent years to the replacement of probiotics by other microorganisms that are not as well adapted to the microenvironments of the human body. These newly settled microorganisms lack many of the beneficial effects of probiotics. Our hypothesis is that the sudden change (from an evolutive perspective) in human intestinal microflora may importantly contribute to the rise in the incidence of autoimmune diseases, observed in the last half a century.


Assuntos
Autoimunidade , Probióticos/uso terapêutico , Humanos , Recém-Nascido , Mucosa Intestinal/microbiologia , Modelos Biológicos , Modelos Imunológicos , Simbiose
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