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Perinatal AIDS: drugs of abuse and transplacental infection
1Department of Pathology, Albert Einstein College of Medicine, Bronx, NY 10461.
Insights
Maternal drug use increases fetal human immunodeficiency virus type-1 (HIV-1) infection risk through direct and indirect mechanisms impacting the maternal-fetal interface and immune systems. This vertical transmission contributes to rising pediatric acquired immunodeficiency syndrome (AIDS) cases.
Area of Science:
- Virology
- Immunology
- Public Health
Background:
- Pediatric acquired immunodeficiency syndrome (AIDS) cases are rising, with a significant number of children infected with human immunodeficiency virus type-1 (HIV-1) during gestation.
- Maternal illicit intravenous drug use is positively correlated with fetal HIV-1 infection, highlighting a critical public health concern.
Purpose of the Study:
- To elucidate the mechanisms by which maternal drug use contributes to vertical transmission of HIV-1.
- To understand how direct and indirect pathways influence fetal susceptibility to HIV-1 infection.
Main Methods:
- Review of existing literature on maternal drug use and HIV-1 vertical transmission.
- Analysis of direct effects on the maternal-fetal interface (e.g., placentitis, vasculitis).
- Examination of indirect effects on maternal and fetal immune systems.
Main Results:
- Maternal drug use can directly alter the maternal-fetal interface, increasing permeability and inflammatory cells.
- Drugs can induce fetal vasculitis, enhancing susceptibility to HIV-1.
- Indirect mechanisms include immune system modulation in mothers, accelerating immunodeficiency and opportunistic infections like cytomegalovirus, and adversely affecting fetal immune development.
Conclusions:
- Maternal drug use presents a multifaceted risk for fetal HIV-1 infection through direct and indirect pathways.
- Interventions targeting maternal substance abuse are crucial for preventing vertical HIV-1 transmission and reducing pediatric AIDS.
- Further research into immune system modulation in both mother and fetus is warranted.
Abstract:
The number of children infected by the human immunodeficiency virus type-1 (HIV-1) who develop the acquired immunodeficiency syndrome (AIDS) continues to increase. While some children become infected after birth and others at the time of parturition, a significant percentage are infected during gestation and there is a positive correlation between maternal illicit intravenous drug use and fetal HIV-1 infection. Drugs can contribute in, at least, four ways to vertical transmission of HIV-1. These four ways are divisible into 2 main categories that are comprised of both direct and indirect mechanisms. For example, drugs of abuse can have a direct effect on the maternal-fetal interface. Cocaine is associated with vasculitis. If this occurs as a placentitis or chorioamnionitis, it can alter the permeability of these barriers to maternal blood and increase the number of potentially infected inflammatory cells in this tissue and as a result in the fetus. Another direct mechanism wherein drugs of abuse can increase the probability that a fetus will become infected is via an inflammatory reaction such as a vasculitis in the fetus rendering it more susceptible to viral infection. Drugs can also affect the course of HIV-1 infection via indirect mechanisms. An example of this may be by modulating the female immune system. This effect can exacerbate the woman's immunodeficiency and accelerate opportunistic infections. For example, cytomegalovirus infection resulting in placentitis might facilitate fetal HIV-1 infection. Lastly, a similar type of indirect mechanism can be postulated for the fetus wherein its developing immune system can be adversely effected.(ABSTRACT TRUNCATED AT 250 WORDS)