The past four years of NIH/NIDA support has enabled a highly successful translational research study of acute hepatitis C virus HCV infection in young injection drug users (IDU), and this application proposes to build on and expand our scientific aims. HCV remains a problematic human pathogen;it is the most common blood borne infection in the U.S. It chronically infects up to 170 million people worldwide and causes an estimated 460,000 deaths per year, primarily due to cirrhosis, liver failure and hepatocellular cancer. Young IDU comprise the population most at risk and with the highest incidence rates (10-40%). Current treatments cure only ~50% and are too toxic for many patients;new ones are likely to have the same limitations. A protective vaccine is plainly needed to prevent productive HCV transmission in at-risk groups. Better understanding of the natural history, detailed correlates of protective immunity, and host genetic factors which impact acute HCV infection (within the first 12-24 weeks after inoculation) is likely to provide the necessary guide for vaccine and therapeutic development. For the majority of persons that are infected, the acute phase lasts six months;and those that remain viremic beyond six months will remain chronically infected. Accurate analyses of the rate, time-course, and immunological predictors of viral clearance in natural HCV infection, have been limited by the relative lack of acute cases available for prospective scientific study as well as lack of generalizability to the population most at risk (IDU). In the past four years, we have characterized acute HCV infection outcomes, clearance rates, transmission dynamics in injecting partners, immunological correlates (HCV-specific CD4+ and CD8+ cellular responses) of clearance, and acute HCV treatment candidacy. This application seeks a five-year renewal to continue and expand our multidisciplinary investigation of acute HCV infection. Our prospective study of 95 acute HCV infections has confirmed and shown robust associations between gender and HCV infection, with females clearing HCV at three times the rate of their male counterparts. Gender has been vastly understudied with respect to HCV infection (and other infections). We have also shown a cycle of recurring infection followed by clearance, demonstrating immune responses may potentially protect from persistent chronic infection. We will examine the effect of gender in more depth, and assess whether gender differences in clearance and reinfection and reclearance are explained by differences in lipid profiles, genetics, immunological responses, and/or injecting behaviors. We will continue the study of transmission dynamics in HCV discordant injecting partnerships to examine transmission events and quantify infectivity, examine the effect of viral load on infectivity and to examine whether susceptibility to infection may differ by gender. We will expand our immunological studies to examine both innate and adaptive cellular immune responses to include NK/T and Tregs. Finally, we add a significant new aim, to study host genetics; assessing the impact of gender-specific polymorphisms in the HCV co-receptor SR-BI on host lipoprotein response to HCV infection. All of these studies will expand the depth and breadth of knowledge regarding acute HCV infection and clearance, including host control of HCV, overall and by gender, to inform improved vaccine designs and potentially therapeutic approaches.
This project seeks a five-year renewal to continue and expand our multidisciplinary investigation of acute HCV infection in young injection drug users. A protective vaccine is urgently needed to prevent productive infection of this most common blood borne virus. Better understanding of the natural history, detailed correlates of protective immunity, and host genetic factors which impact acute HCV infection will guide development of such. We have shown that women clear HCV infection at three times the rate of men, yet gender has been highly understudied with respect to HCV infection. In our prospective study of young IDU (the UFO Study) recurring infection and clearance events demonstrate that successful immune responses can be elicited. This study offers a unique opportunity to study gender differences in epidemiological, immunological and host genetic studies of acute infections prospectively. Results from this work will expand the depth and breadth of knowledge regarding acute HCV infection and clearance, and address fundamental questions of host control of HCV to inform improved vaccine designs and potentially therapeutic approaches.
|Rodrigo, C; Eltahla, A A; Bull, R A et al. (2017) Phylogenetic analysis of full-length, early infection, hepatitis C virus genomes among people with intravenous drug use: the InC3 Study. J Viral Hepat 24:43-52|
|Wolski, David; Foote, Peter K; Chen, Diana Y et al. (2017) Early Transcriptional Divergence Marks Virus-Specific Primary Human CD8+ T Cells in Chronic versus Acute Infection. Immunity 47:648-663.e8|
|Page, Kimberly; Yu, Michelle; Cohen, Jennifer et al. (2017) HCV screening in a cohort of HIV infected and uninfected homeless and marginally housed women in San Francisco, California. BMC Public Health 17:171|
|Esmaeili, A; Mirzazadeh, A; Carter, G M et al. (2017) Higher incidence of HCV in females compared to males who inject drugs: A systematic review and meta-analysis. J Viral Hepat 24:117-127|
|Page, Kimberly; Leeman, Lawrence; Bishop, Steven et al. (2017) Hepatitis C Cascade of Care Among Pregnant Women on Opioid Agonist Pharmacotherapy Attending a Comprehensive Prenatal Program. Matern Child Health J 21:1778-1783|
|Morris, Meghan D; Neilands, Torsten B; Andrew, Erin et al. (2017) Development and validation of a novel scale for measuring interpersonal factors underlying injection drug using behaviours among injecting partnerships. Int J Drug Policy 48:54-62|
|Rodrigo, Chaturaka; Walker, Melanie R; Leung, Preston et al. (2017) Limited naturally occurring escape in broadly neutralizing antibody epitopes in hepatitis C glycoprotein E2 and constrained sequence usage in acute infection. Infect Genet Evol 49:88-96|
|Rodrigo, Chaturaka; Eltahla, Auda A; Bull, Rowena A et al. (2016) Historical Trends in the Hepatitis C Virus Epidemics in North America and Australia. J Infect Dis 214:1383-1389|
|Tsui, Judith I; Mirzazadeh, Ali; Hahn, Judith A et al. (2016) The effects of alcohol on spontaneous clearance of acute hepatitis C virus infection in females versus males. Drug Alcohol Depend 169:156-162|
|Riley, Elise D; Evans, Jennifer L; Hahn, Judith A et al. (2016) A Longitudinal Study of Multiple Drug Use and Overdose Among Young People Who Inject Drugs. Am J Public Health 106:915-7|
Showing the most recent 10 out of 72 publications