Distinct clonal repertoire of brain CD8+ cells in simian immunodeficiency virus infection
MCG Marcondes, CA Phillipson, HS Fox - Aids, 2003 - journals.lww.com
MCG Marcondes, CA Phillipson, HS Fox
Aids, 2003•journals.lww.comObjective: Infection with simian immunodeficiency virus (SIV), like HIV, can lead to central
nervous system (CNS) abnormalities. One of the alterations observed in the brain is the
accumulation of highly activated CD8 lymphocytes that, while fighting the infection, may
cause tissue damage. In order to determine whether these CD8 cells in the brain comprise a
distinct clonal population the expression of T-cell receptor (TCR) genes of two SIV-infected
monkeys with CNS abnormalities were analyzed, comparing brain to periphery. Methods …
nervous system (CNS) abnormalities. One of the alterations observed in the brain is the
accumulation of highly activated CD8 lymphocytes that, while fighting the infection, may
cause tissue damage. In order to determine whether these CD8 cells in the brain comprise a
distinct clonal population the expression of T-cell receptor (TCR) genes of two SIV-infected
monkeys with CNS abnormalities were analyzed, comparing brain to periphery. Methods …
Abstract
Objective:
Infection with simian immunodeficiency virus (SIV), like HIV, can lead to central nervous system (CNS) abnormalities. One of the alterations observed in the brain is the accumulation of highly activated CD8 lymphocytes that, while fighting the infection, may cause tissue damage. In order to determine whether these CD8 cells in the brain comprise a distinct clonal population the expression of T-cell receptor (TCR) genes of two SIV-infected monkeys with CNS abnormalities were analyzed, comparing brain to periphery.
Methods:
RNA from magnetically sorted CD8+ cells obtained from the brain, blood, lymph nodes, and spleen was analyzed for the distribution of 24 Vβ family genes by reverse transcriptase-polymerase chain reaction followed by Southern blot. The CDR3 region of the most enriched family in each brain was sequenced in all the sites for comparison.
Results:
The pattern of Vβ distribution in the brain and the periphery was polyclonal, but an increase in certain Vβ families was found in the brain, suggesting that regional mechanisms participate in the determination of the local clonal specificities. The sequence of the CDR3 domain of predominant Vβ families in the brain revealed that approximately one-third of the CD8 cells were not identified in the periphery.
Conclusion:
CD8 cells in the brain exhibit a distinct clonal repertoire. This distinction may have implications for regional immunity, regulation, or selection of site-specific viral mutants.
Lippincott Williams & Wilkins