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The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a...
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Children master language quickly and with relative ease, supported by both biological predisposition and reinforcement. B. F. Skinner (1957) proposed that language is learned through reinforcement, while Noam Chomsky (1965) argued that language acquisition mechanisms are biologically determined.
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Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
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Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells
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Complement C3 Affects Rac1 Activity in the Developing Brain.

Anna Gorelik1, Tamar Sapir1, Lihi Ben-Reuven1

  • 1Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel.

Frontiers in Molecular Neuroscience
|June 6, 2018
PubMed
Summary
This summary is machine-generated.

Complement C3 impacts brain development by altering small GTPase activity, leading to cell cycle defects and premature neuronal differentiation in mice.

Keywords:
Rac1cell cyclecomplement C3cortical developmentneuronal stem cells

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Area of Science:

  • Neuroscience
  • Immunology
  • Developmental Biology

Background:

  • The complement system, a key part of innate immunity, plays a role in brain development.
  • Small GTPases regulate the cytoskeleton and are crucial for neuronal development.

Purpose of the Study:

  • To investigate the link between complement C3 and small GTPases in the developing brain.
  • To understand how complement C3 influences neuronal cell cycle and differentiation.

Main Methods:

  • Studied complement C3-deficient mice and wild-type controls.
  • Analyzed the activity of small GTPases (Rac1, RhoA) and related proteins (phospho-cofilin).
  • Assessed progenitor and neuronal marker expression and cell cycle progression.

Main Results:

  • C3 deficiency reduced Rac1 activity and increased RhoA activity.
  • Reduced Rac1 activity correlated with decreased phospho-cofilin and progenitor markers, and increased neuronal markers.
  • C3 deficiency led to cell cycle defects, including reduced S-phase and premature cell cycle exit.

Conclusions:

  • Complement C3 influences small GTPase activity in the developing brain.
  • C3 deficiency disrupts normal neuronal cell cycle progression and differentiation timing.
  • These findings highlight a novel role for the complement system in neurodevelopment.