CD8+ Cell Noncytotoxic Antiviral Response in Long-Term HIV-1 Infected Former Blood Donors in China
Lin Yuan, Liying Ma, Xiujuan Fan, Yi Feng, Hong Peng, Quanbi Zhao, Yuhua Ruan, J. A. Levy and Yiming Shao
Affiliation: State Key Laboratory for Infectious Disease Prevention and Control, National Center for AIDS/STD Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 100050, China.
Most of the HIV-infected long term survivors show strong CD8+ cell noncytotoxic antiviral response (CNAR) that plays as an important factor for maintaining the relative healthy state of infected individuals. HIV infected former blood donors (FBDs) in Anhui, China are the unique population that considered infected by the same or a related HIV strain by the same exposure route, and is better to be studied for viral and host immunological factors associated with disease progression, such as CNAR. We examined CNAR in 63 asymptomatic untreated HIV infected FBDs with different CD4+ cell counts and plasma viral loads. The average CD8+ : CD4+ cell ratio to reach 90% suppression of HIV replication in the groups with CD4+ cell counts of > 500, 300-500 and < 300 cells/μl were 0.85 : 1, 1.47 : 1 and 1.88 : 1 respectively (P < 0.0001). The average CD8+ : CD4+ cell ratio to reach 90% suppression of HIV replication was 1.07 : 1 and 1.66 : 1 in the group with plasma viral load of < 30,000 and > 30,000 RNA copy/ml respectively (P=0.0002). The results indicated that CNAR activity in long-term HIV-1 infected FBDs correlates directly with CD4+ cell counts, and correlates reversely with plasma viral loads. Our findings in long term infected FBDs confirm the clinical relevancy of CNAR and suggest that CNAR could be an additional marker to help determine the optimal time for starting therapy in HIV infected person.
Keywords: HIV, CNAR, CD4+ cell count, former blood donor (FBD), long-term survivor, acute infection assay
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