Related Experiment Videos
[Mycoplasmas and AIDS]
1Cátedra de Patología II, Facultad de Medicina, Universidad Nacional de La Plata, Argentina.
Insights
Mycoplasma may play a role in Acquired Immunodeficiency Syndrome (AIDS) progression. These bacteria might exacerbate CD4+ T lymphocyte depletion, a hallmark of HIV infection, potentially influencing disease development.
Area of Science:
- Immunology
- Microbiology
- Infectious Diseases
Background:
- Acquired Immunodeficiency Syndrome (AIDS) is characterized by severe immunodeficiency, primarily due to CD4+ T lymphocyte depletion.
- The exact mechanisms driving CD4+ T lymphocyte depletion in AIDS remain incompletely understood.
- Mycoplasma has been investigated for its potential role in AIDS pathogenesis since 1986.
Purpose of the Study:
- To explore the potential role of Mycoplasma as a cofactor in the etiopathology of AIDS.
- To investigate proposed mechanisms for Mycoplasma-HIV synergism in disease progression.
Main Methods:
- Review of in vivo and in vitro experimental evidence regarding Mycoplasma and AIDS.
- Analysis of theoretical models suggesting Mycoplasma's influence on lymphocyte activation and cytokine release.
Main Results:
- Controversial in vivo and in vitro data suggest Mycoplasma may contribute to AIDS pathogenesis.
- A proposed mechanism involves Mycoplasma translocation to various body sites, proliferation under HIV-induced immune dysfunction, and superantigen-like T-cell activation.
- Mycoplasma-induced cytokine release may impact disease progression.
Conclusions:
- Mycoplasma is hypothesized to act as a cofactor, potentially exacerbating CD4+ T lymphocyte depletion in HIV infection.
- Mycoplasma may induce chronic T-lymphocyte activation, leading to apoptosis and influencing AIDS progression.
- Further research is needed to clarify the complex interactions between Mycoplasma and HIV.
Abstract:
AIDS is a complex illness due to HIV type 1 and 2 infection. It is characterized by an important immunodeficiency mainly caused by depletion of CD4+ T lymphocytes. The reasons for this depletion have not been sufficiently clarified yet. In 1986, Shy Ching Lo astonished the scientific community with reported evidence concerning the direct role played by mycoplasma in the etiopathology of AIDS. Since then, different theories have pointed to mycoplasma as cofactors, commensals or opportunistic agents. Although in vivo and in vitro experiments are controversial they suggest a possible mechanism that would explain the synergism between both agents: the mycoplasma belonging to normal intestinal flora could move to urethra, oropharynx or blood due to high risk sexual practice. There it would proliferate favoured by early immunological disorders related to HIV. It has been speculated that several microorganisms including mycoplasma, acting as superantigens, could induce a chronic CD4+ and CD8+ T lymphocytes activation resulting in apoptosis of the infected lymphocytes. The release of cytokines induced by mycoplasma could influence the progression of the disease.