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Connective Tissue Cell Types01:22

Connective Tissue Cell Types

Connective tissue develops from the mesoderm of a developing embryo and consists of cells, fibers, and ground substance: a gel-like material containing large complexes of carbohydrates and proteins. Connective tissue was first identified as a separate tissue family in the 18th century, and Johannes Peter Muller coined the term connective tissue.
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Inflammatory Response01:28

Inflammatory Response

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Vitamin D and inflammation.

Xavier Guillot1, Luca Semerano, Nathalie Saidenberg-Kermanac'h

  • 1EA4222, Li2P, PRES Paris-Cité, université Paris 13, 93000 Bobigny, France. xavier.guillot@avc.aphp.fr

Joint Bone Spine
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PubMed
Summary
This summary is machine-generated.

Vitamin D, or calcitriol, modulates immune responses by affecting T cells, B cells, and antigen-presenting cells. This immune regulation may explain vitamin D

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Area of Science:

  • Immunology
  • Endocrinology
  • Calcium Homeostasis

Background:

  • Calcitriol (1,25-dihydroxyvitamin D3) is a key regulator of calcium homeostasis.
  • Immune cells produce calcitriol, exerting local immunomodulatory effects via autocrine or paracrine signaling.
  • Immune cells express the vitamin D receptor (VDR) and necessary metabolizing enzymes (hydroxylases).

Purpose of the Study:

  • To explore the immunomodulating effects of calcitriol produced by immune cells.
  • To investigate the role of vitamin D in innate and adaptive immune responses.
  • To understand the link between vitamin D status and autoimmune/inflammatory diseases.

Main Methods:

  • Analysis of animal models and cell cultures.
  • Examination of immune cell (T cells, B cells, dendritic cells, macrophages) interactions.
  • Assessment of effects on Th1/Th17 versus Th2/Treg immune profiles.

Main Results:

  • Calcitriol production by immune cells influences T cells, B cells, and antigen-presenting cells.
  • Vitamin D shifts immune responses from Th1/Th17 to Th2/Treg profiles.
  • Vitamin D supplementation shows therapeutic effects in animal models of various diseases.

Conclusions:

  • Local calcitriol production by immune cells has significant immunomodulatory functions.
  • Vitamin D's effects on immune cells may explain associations with autoimmune and inflammatory conditions.
  • Vitamin D holds promise for treating immune-related diseases and is a public health focus.