RESUMO
Immunogenetic studies have suggested that autoantibody production is commonly associated with particular human leukocyte antigens (HLA) class II genotypes in certain autoimmune diseases. The objective of this study was to investigate whether the production of anti-ß2-glycoprotein I antibody (aß2GPI) was associated with particular HLA-DQ alleles in patients with recurrent miscarriage (RM). The HLA-DQ genotypes in 126 patients with RM were determined using the polymerase chain reaction-sequence-specific primer method. Both the IgG and IgM isotypes of aß2GPI were measured via enzyme-linked immunosorbent assay. Positive results for either IgG or IgM on two occasions within an interval of 12 weeks were defined as antiphospholipid antibody-positive. The frequencies of the HLA-DQA1*01:02 [odds ratio (OR) 3.4, 95% confidence interval (CI) 1.6-7.0, Pc = 0.018] and HLA-DQB1*02:01 alleles (OR 4.6, 95% CI 2.1-10.2, Pc = 9.18 × 10(-4)) were significantly increased in aß2GPI-positive RM patients compared with aß2GPI-negative RM patients. These results suggest that the HLA-DQA1*0102 and HLA-DQB1*0201 alleles may be involved in the production of aß2GPI in RM patients.
Assuntos
Aborto Habitual/genética , Alelos , Autoanticorpos/sangue , Doenças Autoimunes/genética , Cadeias alfa de HLA-DQ/imunologia , Cadeias beta de HLA-DQ/imunologia , Aborto Habitual/sangue , Aborto Habitual/imunologia , Aborto Habitual/patologia , Adulto , Doenças Autoimunes/sangue , Doenças Autoimunes/imunologia , Doenças Autoimunes/patologia , Feminino , Expressão Gênica , Frequência do Gene , Predisposição Genética para Doença , Cadeias alfa de HLA-DQ/genética , Cadeias beta de HLA-DQ/genética , Teste de Histocompatibilidade , Humanos , Imunoglobulina G/sangue , Imunoglobulina M/sangue , Gravidez , beta 2-Glicoproteína I/sangue , beta 2-Glicoproteína I/imunologiaRESUMO
Previous studies have shown deficits in DA neuronal systems in senescence. Other studies indicate that prolonged dietary restriction can attenuate many of the detrimental effects of age. We have shown previously using in vivo electrochemistry that K+-evoked striatal DA overflow decreases as a function of age. This was a regional effect that appeared to be due to functional changes in DA neurons, rather than a decrease in the storage and synthesis of DA. In the present studies, we used in vivo electrochemistry to investigate the effects of caloric restriction on age related decreases in K+-evoked DA overflow along a dorsal to ventral axis in the striatum of aged female Fischer 344 rats. Aged (26-28-month-old) diet restricted animals (DRF) showed evoked DA overflow that was significantly greater in amplitude and duration compared to aged (26-28-month-old) ad lib fed animals (ALF). These results provide additional evidence that decreased DA neuronal function resulting from age is improved by caloric restriction.
