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The phylum Tenericutes, which includes the single class Mollicutes, comprises bacteria that lack cell walls. The term "Mollicutes" derives from the Latin word mollis, meaning "soft." These organisms are among the smallest known and are commonly referred to as mycoplasmas due to the prominence of the genus Mycoplasma, which includes well-known human pathogens. Despite their inability to stain gram-positively (a result of their lack of cell walls), mycoplasmas are phylogenetically related to the...
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Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
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Natural flora, body system defenses, and inflammation are natural barriers of the body against infectious agents regardless of previous exposure. Normal floras of the human body refer to the microbial population that colonizes the skin and mucous membranes.
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Complement Immune Evasion by Spirochetes.

Angela S Barbosa1, Lourdes Isaac2

  • 1Laboratory of Bacteriology, Butantan Institute, São Paulo, Brazil. angela.barbosa@butantan.gov.br.

Current Topics in Microbiology and Immunology
|September 24, 2017
PubMed
Summary
This summary is machine-generated.

The complement system defends against pathogens, but spirochetes evade it. This review details how Borrelia, Leptospira, and Treponema overcome complement defenses for survival.

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Area of Science:

  • Immunology
  • Microbiology

Background:

  • The complement system is crucial for innate and adaptive immunity, distinguishing self from non-self to eliminate pathogens.
  • Complement proteins act as pattern recognition molecules, initiating cascades that lead to pathogen elimination via opsonization, phagocytosis, and cell lysis.

Purpose of the Study:

  • To provide an overview of complement activation and regulation.
  • To detail the evasion strategies employed by spirochetes (Borrelia, Leptospira, Treponema) against the complement system.

Main Methods:

  • Literature review of complement activation and regulation.
  • Analysis of scientific literature detailing spirochete-complement interactions.

Main Results:

  • Spirochetes have evolved specialized mechanisms to evade complement-mediated destruction.
  • Understanding these evasion strategies is key to comprehending spirochete survival and pathogenesis.

Conclusions:

  • Spirochetes effectively counteract complement system functions through diverse evasion tactics.
  • Further research into these mechanisms could reveal novel therapeutic targets against spirochetal infections.