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HIV-induced cysteine deficiency and T-cell dysfunction--a rationale for treatment with N-acetylcysteine
1Division of Immunochemistry, Deutsches Krebsforschungszentrum, Heidelberg, FRG.
Insights
HIV infection significantly lowers cysteine levels, crucial for immune function. Elevated glutamate worsens this deficiency, potentially contributing to AIDS pathogenesis by disrupting the antioxidant balance.
Area of Science:
- Immunology
- Biochemistry
- Virology
Background:
- HIV infection is associated with decreased plasma cystine and cysteine.
- Elevated glutamate levels in HIV patients exacerbate cysteine deficiency.
- A balanced pro-oxidant/antioxidant state, regulated by cysteine, is vital for immune function.
Purpose of the Study:
- To investigate the role of cysteine deficiency in HIV pathogenesis.
- To understand the impact of elevated glutamate on cysteine transport.
- To explore the link between immune system imbalance and HIV infection.
Main Methods:
- Analysis of plasma cystine and cysteine concentrations in HIV-infected patients and SIV-infected macaques.
- Assessment of glutamate levels in the same patient cohort.
- Evaluation of the effect of glutamate on cystine membrane transport.
Main Results:
- Markedly decreased plasma cystine and cysteine were observed in all stages of HIV infection and in SIV-infected macaques.
- Elevated glutamate levels were found in HIV-infected patients.
- Glutamate was shown to inhibit membrane transport activity for cystine, worsening the deficiency.
Conclusions:
- HIV infection disrupts the critical balance of pro-oxidant and antioxidant conditions necessary for an intact immune system.
- Cysteine deficiency, aggravated by elevated glutamate, may play a significant role in the pathogenesis of Acquired Immunodeficiency Syndrome (AIDS).
- Restoring cysteine levels could be a potential therapeutic strategy for HIV/AIDS.
Abstract:
Markedly decreased plasma cystine and cysteine concentrations have been found in HIV-infected patients at all stages of the disease and in SIV-infected rhesus macaques. The elevated glutamate levels found in the same patients aggravate the cysteine deficiency by inhibiting the membrane transport activity for cystine. The intact immune system appears to require a delicate balance between pro-oxidant and antioxidant conditions, maintained by a limited and well-regulated supply of cysteine. This balance is obviously disturbed in HIV infection and may contribute to the pathogenesis of AIDS.