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Virological course of hepatitis A virus as determined by real time RT-PCR: Correlation with biochemical, immunological and genotypic profiles

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World Journal of Gastroenterology 2006年第29期12卷 4683-4688页

作者： Zahid Hussain Bhudev C Das Syed A Husain Sunil K Polipalli tanzeel ahmed Nargis Begum Subhash Medhi Alice Verghese Mohammad Raish Apiradee Theamboonlers Yong Poovorawan Premashis Kar PCR Hepatitis Laboratory Department of Medicine Maulana Azad Medical CollegeNew Delhi 110002India Human Genetics LaboratoryDepartment of BiosciencesJamia Millia IslamiaNew Delhi 110025India Division of Molecular Oncology Institute of Cytology and Preventive Oncology (ICMR)NoidaSector 39Uttar PradeshIndia Human Genetics Laboratory Department of Biosciences Jamia Millia IslamiaNew Delhi 110025India PCR Hepatitis Laboratory Department of Medicine Maulana Azad Medical CollegeNew Delhi 110002India Advance Center for AIDS National Institute of Communicable Diseases New Delhi 110041India Viral Hepatitis Research Unit Department of Pediatric Faculty of MedicineChulalolongkorn University and HospitalRama Ⅳ RoadBangkok 10330Thailand PCR Hepatitis Laboratory Department of Medicine Maulana Azad Medical College New Delhi 110002India

AIM： To undertake analysis of hepatitis A viral load, alanine aminotransferase （ALT）, and viral genotypes with duration of viremia, and to correlate these parameters with CD4^＋/ CD8^＋ lymphocyte populations that control cell-mediated immunity. METHODS： Cell counts were carried out using fresh whole blood collected in EDTA vials using a fluorescence activated cell sorter. Hepatitis A virus （HAV） RNA was extracted from blood serum, reverse transcribed into cDNA and quantified by Real-Time polymerase chain reaction and was genotyped. RESULTS： Among 11 patients, 10 could be analyzed completely. Of these, 3 had severe acute hepatitis （s-AH） and the remainder had a self-limited acute hepatitis A （AHA）, with one patient with fulminant disease （encephalopathy Grade IV） dying on the 4^th d. The ALT level was significantly higher both in AHA （1070.9±894.3; P = 0.0014） and s-AH （1713.9±886.3; P = 0.001） compared to normal controls （23.6±7.2）. The prothrombin time in s-AH patients （21.0 ±2.0; P=0.02） was significantly higher than in AHA （14.3±1.1;P = 0.44）. The CD4^＋/CD8^＋ ratio in AHA patients （1.17 ＋ 0.11; P = 0.22） and s-AH （0.83 ＋ 0.12; P = 0.0002） were lower than seen in normal healthy controls （1.52）. Self-limited cases had peak viral load at the beginning of analysis while in s-AH patients this occurred at the 15TM or 30^th d. In acute and severe groups, one patient each belonged to genotype IA, with the remaining 8 cases belonging to genotype IIIA. The only fulminant hepatic failure case belonged to genotype IA. HAV viral load and AIT values collected during the entire course of the selflimited infection were directly correlated but this was not the case for s-AH patients.CONCLUSION： Based on a small-scale study, the persistently higher viral load of s-AH might be due to diminished cellular immunity and hemolysis. The duration of viremia was dependent on the host, as the viral genotype had no apparent role in clinical outcome of AVH and s-AH cases.

关键词： Viral load Real-time PCR Immunologicalresponse Severe acute hepatitis Self-limited acute henatitis

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