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Parvovirus B19 is the causative agent for fifth disease. Recently, it was reported that B19 may play an important role in the pathogenesis of HBV in Vietnamese patients. We here aimed to investigate whether B19 infection may be a co-factor for disease progression in European patients with chronic hepatitis C.

In this study, 91 serum samples from well characterized and histologically staged chronic hepatitis C patients and 50 serum samples from chronic hepatitis B patients were investigated for the presence of B19 antibodies and B19 DNA (real-time PCR). Moreover, 50 explanted livers and 32 liver biopsy samples (obtained for routine staging of chronic liver disease) were tested for B19 DNA. Finally, B19-specific CD4+ T cell responses were studied in 13 anti-B19-positive hepatitis C patients and 19 serologically recovered B19 infected healthy individuals.

In contrast to the previous study on Vietnamese HBV-patients, we detected B19 DNA in only 1/ 91 serum samples from chronic hepatitis C patients and in none of the serum samples from chronic hepatitis B patients. B19 IgG antibodies were found in 67/91 (74%) HCV patients, while only the B19 DNA-positive hepatitis C patient was anti-B19-IgM positive. Clinical and histological characteristics did not differ between anti-B19-IgG-positive and IgG-negative patients. Surprisingly, B19 DNA was amplified from more than half of the liver tissues studied and more frequently detectable in explanted end-stage liver tissues (74%) than in biopsy samples (44%)(p<0.05). However, there was no significant difference in virus copy number per cell between these two groups. Finally, B19-specific CD4+ T cell responses were detected in a similar frequency in healthy anti-B19-positive individuals (3/19; 16%) and chronic hepatitis C patients (3/13; 23%).

In conclusion, this study gives evidence that B19 may persist in the liver.

However, even though B19-DNA can be detected intrahepatically, there is no evidence that B19 is a “hepatitis virus” worsening liver disease and accelerating disease progression of chronic hepatitis C in European patients.

Role of Parvovirus B19 infection in hepatitis C -- Reference

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Role of Parvovirus B19 infection in hepatitis C -- Abbreviations

7. List of abbreviations:

B19 Parvovirus B19

HCV Hepatitis C virus

qPCR Quantity Polymerase chain reaction

nPCR Nested Polymerase chain reaction

FH Fulminant hepatitis

PBMC Peripheral blood mononuclear cell

ALT alanine aminotransferase

AST aspartate aminotransferase

gGT gamma-glutamyltransferase

ULM Upper limited of normal

AHB Acute hepatitis B

CHB Chronic hepatitis B

LC Liver cirrhosis

HCC Hepatocellular carcinoma

VAHS Virus-associated-hemophagocytic

syndrome

NASH Nonalcoholic steatohepatitis

DMSO dimethyl sulfoxide

PHA phytohemagglutinin

TT Tetanus toxoid

Role of Parvovirus B19 infection in hepatitis C -- Acknowledgements

8. Appendix

Acknowledgements

I would like to acknowledge numerous people for their kindness and support in the past two years. Without their priceless help, this thesis could not be finished.

At the very beginning, I’m honored to express my appreciation to Prof. Dr. med.

Michael P. Manns, who gave me great support during my two-year advanced study in his Department.

Here I must express the deepest gratitude to my supervisor, Priv. Doz. Dr. med.

Heiner Wedemeyer. He gave me the opportunity to join his lab. He offered me valuable ideas, suggestions and guidance with his professional attainment in Hepatology and Immunology. His patience and kindness are greatly appreciated.

Moreover, he always puts high priority on my project and has provided me with good communication whenever he is available. I’m very much obliged to his efforts of helping me complete the dissertation.

I’m also grateful to PD. Dr. med. Albert Heim and PD. Dr. rer. nat. C.-Thomas Bock who gave me patient guidance and many useful advices and supports.

I owe special thanks to all members of our group: Markus, Katja, Sandra, Evi, Verana, Kerstin, Suneetha. All of them gave me great supports and showed warmest concern not only for my study but also for my daily life in Germany.

I wish to extend my gratitude to Hong Jiang, Regina, Peter, Birgit, Ursel, Nicole and many many faculty members and staffs of the department assisted and encouraged me in various ways during my study.

At last, I would like to say thanks to my family and my husband for their support and love.

Role of Parvovirus B19 infection in hepatitis C -- CV

Curriculum vitae

Personal information:

Name: Wang

First name: Chun

Gender: Female

Birthday: 06.06.1970

Birthplace: Shanghai, P.R. China

Nation: Chinese

Education:

Sept. 1977- July. 1982 Elementary education Sept. 1982- July.1988 High school

Study:

Sept.1988- July.1993 Shanghai Tiedao Medical College, Shanghai, China Completion: medical bachelor’s degree

Sept.2001- July. 2004 Tongji University, Shanghai, China Completion: medical master’s degree Occupation:

Aug. 1993- Aug. 2001 Shanghai Railway Bureau Central Hospital Dept. Internal medicine and Dept. Endocrinology Shanghai, China

Aug. 2004-Sept. 2005 Tongji University affiliated Shanghai Tenth People´s Hospital.

Dept. Endocrinology Shanghai, China

Oct. 2005-Sept. 2007 Medical school Hannover,

Dept. Gastroenterology, Hepatology and Endocrinology

Hannover, Germany

Role of Parvovirus B19 infection in hepatitis C -- Erklärung

Erklärung

Laut Paragraf 2, Absatz 2, Nummern 5 und 6 der Promotionsordnung der Medizinischen Hochschule Hannover.

Ich erkläre, dass ich die der Medizinischen Hochschule Hannover zur Promotion eingereichte Dissertation mit dem Titel „Parvo-Virus B19 Infection: Evidence for intrahepatic long-term persistence but no association with disease progression in chronic hepatitis C" in der Klinik für Gastroenterologie, Hepatologie und Endokrinologie

der Medizinischen Hochschule Hannover unter Leitung von Priv. Doz. Dr. med.

Heiner Wedemeyer ohne sonstige Hilfe selbst durchgeführt und bei der Abfassung der Dissertation keine anderen als die dort aufgeführten Hilfsmittel benutzt habe.

Ich habe diese Dissertation bisher an keiner in- oder ausländischen Hochschule zur Promotion eingereicht. Weiterhin versichere ich, dass ich den beantragten Titel bisher noch nicht erworben habe.

Hannover, den 3.2.2008

Chun Wang