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Related Concept Videos

Complement System01:27

Complement System

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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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Isolation of Murine Peritoneal Macrophages to Carry Out Gene Expression Analysis Upon Toll-like Receptors Stimulation
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Quantitative In-Depth Transcriptome Analysis Implicates Peritoneal Macrophages as Important Players in the Complement

Aida Paivandy1, Srinivas Akula2, Sandra Lara2

  • 1Department of Medical Biochemistry and Microbiology, Uppsala University, The Biomedical Center, SE-751 23 Uppsala, Sweden.

International Journal of Molecular Sciences
|February 15, 2022
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Summary

Mouse peritoneal macrophages (MΦs) are key producers of antimicrobial proteins and chemokines, playing significant roles in complement and coagulation. Human monocytes share some MΦ traits but differ in connective tissue and antigen presentation gene expression.

Keywords:
coagulation systemcomplement systemlivermRNAmacrophagemonocytetranscriptome

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Area of Science:

  • Immunology and Cell Biology
  • Transcriptomics and Molecular Biology

Background:

  • Macrophages (MΦs) are crucial immune cells with diverse functions.
  • Understanding the specific transcriptome of peritoneal MΦs provides insights into their specialized roles.

Purpose of the Study:

  • To detail the transcriptome of mouse peritoneal MΦs using RNA-seq and PCR-based transcriptomics.
  • To compare the transcriptome of mouse peritoneal MΦs with human peripheral blood monocytes and liver cells.

Main Methods:

  • RNA sequencing (RNA-seq) of mouse peritoneal MΦs.
  • PCR-based transcriptomics for detailed gene expression analysis.
  • Comparative analysis with human peripheral blood monocytes.

Main Results:

  • Mouse peritoneal MΦs highly express antimicrobial proteins (e.g., lysozyme) and chemokines (e.g., PF4, Ccl6).
  • Peritoneal MΦs are significant local sources of complement (e.g., C1q, properdin) and coagulation factors (e.g., FV, FX).
  • Human monocytes share lysozyme, properdin, and ficolin expression but lack connective tissue genes and show higher MHC Class II expression compared to peritoneal MΦs.

Conclusions:

  • Mouse peritoneal MΦs possess a unique transcriptome, acting as vital local regulators of complement and coagulation.
  • Significant differences exist between mouse peritoneal MΦs and human monocytes, particularly in connective tissue and antigen presentation.
  • This study offers a novel perspective on peritoneal MΦ phenotype and their comparative transcriptomic landscape.