Immunological interactions between host cells and mycoplasmas: an introduction

Area of Science:

• Microbiology
• Immunology
• Cell Biology

Background:

• Mycoplasmas are known to elicit host immune responses.
• Early research indicated both inhibitory and stimulatory effects of mycoplasmas on immune responses in vivo.
• Recent studies have clarified these effects as nonspecific stimulation of B and T lymphocytes and immunosuppression.

Purpose of the Study:

• To define the nature of mycoplasma-host cell interactions.
• To investigate the mechanisms behind the observed immune modulation by mycoplasmas.
• To understand the role of these interactions in mycoplasma-induced pathogenesis and persistence.

Main Methods:

• Review of early and recent scientific literature on mycoplasma-host interactions.
• Analysis of immunological data regarding B and T lymphocyte responses.
• Examination of proposed mechanisms involving mycoplasma attachment to host cell membranes.

Main Results:

• Mycoplasmas nonspecifically stimulate B and T lymphocytes.
• Mycoplasmas exert nonspecific immunosuppressive effects in experimental models and humans.
• Interactions involve mycoplasma attachment to host cell membranes, potentially sharing components.
• The mitogenic properties of mycoplasmas contribute to inflammatory responses and disease.

Conclusions:

• Mycoplasma-induced diseases may result from nonspecific inflammatory responses to the organism's mitogenic properties.
• Close association with host cell membranes aids mycoplasmas in evading immune surveillance.
• This evasion facilitates the prolonged surface colonization characteristic of many mycoplasma infections.