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Immune reconstitution in HIV infection
J C Gea-Banacloche1, H Clifford Lane
1Clinical and Molecular Retrovirology Section, Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA.
AIDS (London, England)
|July 8, 2000
Summary
Many HIV patients achieve immune recovery with viral suppression, but full immune function is rarely restored. This suggests potential shifts in treatment strategies and the need for better immune monitoring in HIV care.
Area of Science:
- Immunology
- Virology
- Infectious Diseases
- Antiretroviral Therapy Research
Background:
- Published evidence indicates significant immune recovery in a substantial portion of HIV-infected patients achieving viral replication suppression.
- However, complete restoration of normal immune function, comparable to pre-infection levels, is seldom observed even after extended follow-up periods.
- The potential for full immune reconstitution is limited, especially in cases of advanced immune damage, drawing parallels with outcomes from bone-marrow transplantation.
Purpose of the Study:
- To assess the extent of immune recovery in HIV patients undergoing antiretroviral therapy.
- To evaluate the implications of immune reconstitution for clinical practice, including opportunistic infection prophylaxis.
- To explore the need for improved immune function markers and potential adjustments in HIV treatment strategies.
Main Methods:
- Review and synthesis of published evidence on immune recovery in HIV-infected patients on highly active antiretroviral therapy (HAART).
- Analysis of immune markers, including CD4 cell counts and viral load, in conjunction with immune activation markers.
- Consideration of long-term follow-up data from antiretroviral therapy studies.
Main Results:
- Clinically significant immune recovery is observed in many HIV patients who achieve viral suppression.
- Few patients regain normal immune function, and effective immunity against HIV is not achieved in a significant proportion.
- Opportunistic infection prophylaxis may be safely discontinued in most patients responding to HAART.
Conclusions:
- While immune reconstitution occurs, it is often incomplete, necessitating further research into protective immunity and reliable immune function measures.
- Clinical practice can likely adapt by discontinuing prophylaxis for opportunistic infections in responding patients.
- The findings support evaluating less aggressive or later initiation of antiviral therapy, considering treatment challenges and side effects.