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Hormones and Bone Tissue01:17

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Calcitonin, a vital polypeptide hormone, regulates calcium levels within body fluids. It is released by the parafollicular cells, also known as C cells, situated in the follicular epithelium of the thyroid gland. Calcitonin responds to fluctuations in blood calcium levels and the influence of gastrointestinal hormones like gastrin and cholecystokinin.
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Gut microbiome, parathyroid hormone, and bone.

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Gut microbes and their metabolites influence bone mass by interacting with parathyroid hormone (PTH) and the immune system. Understanding these gut-bone-immune interactions is crucial for CKD-mediated bone disease.

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Area of Science:

  • Microbiology
  • Immunology
  • Endocrinology
  • Nephrology

Background:

  • The gut microbiome and metabolome play a role in regulating bone mass.
  • Parathyroid hormone (PTH) actions on bone are modulated by microbial metabolites and immune cells.
  • Chronic kidney disease (CKD) is associated with dysbiosis, altering the gut microbiome and metabolome.

Purpose of the Study:

  • To review the current understanding of gut microbiome and metabolome influence on bone mass.
  • To explore the relationship between gut physiology and CKD-mediated bone disease.
  • To highlight the need for mechanistic studies on gut metabolites in renal osteodystrophy.

Main Methods:

  • Literature review of existing data on gut microbiome, metabolome, PTH, immune system, and bone.
  • Analysis of how microbial metabolites affect immune cell function (e.g., T-cell differentiation, Wnt10b ligand secretion).
  • Examination of the impact of CKD-associated factors (diet, antibiotics, medications) on gut dysbiosis.

Main Results:

  • Microbial metabolites like butyrate are essential for immune cell functions that support bone formation (e.g., Wnt10b secretion).
  • Certain gut bacteria (e.g., segmented filamentous bacteria) can promote immune responses leading to bone resorption.
  • CKD-induced dysbiosis may significantly impact the pathogenesis of renal osteodystrophy, but this remains underexplored.

Conclusions:

  • Gut microbiome and metabolome are critical regulators of bone mass via PTH and immune pathways.
  • Dysregulation of these pathways in CKD contributes to bone disease.
  • Further research is needed to elucidate the specific roles of gut metabolites in CKD-mediated bone disease and inform treatment strategies.