The HLA-G 14-base pair deletion allele and the deletion/deletion genotype are associated with persistent HBe antigenemia in chronic hepatis B infection

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• 作者：Sandro da Costa Ferreira^a ; ^{sandrocferreira@terra.com.br} ; Silvana Gama Florê ; ncio Chachá ; ^a ; ^b ; Fernanda Fernandes Souza^a ; Andreza Corrê ; a Teixeira^a ; Rodrigo de Carvalho Santana^c ; Neifi Hassan Saloun Deghaide^d ; Sandra Rodrigues^a ; Leonardo A. Marano^e ; Celso Teixeira Mendes-Junior^f ; Leandra Naira Zambelli Ramalho^g ; Sé ; rgio Zucoloto^g ; ¹ ; Eduardo Antô ; nio Donadi^d ; Ana de Lourdes Candolo Martinelli^a
• 关键词：HLA-G ; 14 bp-insertion/deletion (I/D) ; Chronic hepatitis B ; HBeAg-positive
• 刊名：Human Immunology
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：78
• 期：2
• 页码：166-171
• 全文大小：379 K
• 卷排序：78

文摘

Background and aims: HLA-G has well-recognized immunomodulatory properties, and this molecule is frequently expressed in the livers of hepatitis B virus (HBV)-infected patients. Because the HLA-G 14 bp-insertion/deletion polymorphism (rs371194629) has been associated with the magnitude of HLA-G expression, we evaluated this polymorphism in the recognized evolutionary forms of chronic HBV infection. Methods: We studied 196 chronic HBV-infected patients (118 HBeAg-negative chronic hepatitis, 53 HBeAg-positive chronic hepatitis and 25 inactive carriers exhibiting low levels of serum HBVDNA and persistently normal ALT levels), and 202 healthy individuals. Chronic hepatitis HLA-G typing was performed using PCR-amplified DNA hybridized with specific primers. Results: The frequencies of the insertion/deletion alleles and genotypes were very similar in patients and controls. After patient stratification according to the evolutionary form of the chronic HBV infection, the frequencies of the deletion allele (P = 0.0460; OR = 1.26; 95%CI = 1.01–1.45) and of the deletion/deletion genotype (P = 0.0356; OR = 2.08; 95%CI = 1.05–4.09) were overrepresented in HBeAg-positive patients when compared to HBeAg-negative patients. No differences were observed when HBV inactive carriers were compared to HBeAg-negative chronic hepatitis patients. Conclusions: Because the 14-bp deletion allele has been associated with increased HLA-G production and because HLA-G may down regulate the cytotoxic activity of TCD8 and NK cells, patients exhibiting the 14-bp deletion allele at single or double doses are at increased risk for developing chronic forms of HBV associated with persistent viremia and worse prognoses.