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The two pairs of parathyroid glands embedded within the posterior surface of the thyroid gland are restricted by a dense capsule around them. These glands comprise two distinct cell populations—parathyroid oxyphil and parathyroid principal cells- pivotal in calcium homeostasis.
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The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
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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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Calcium is not only the most abundant mineral in bone but also the most abundant mineral in the human body. Calcium ions are needed for bone mineralization, tooth health, heart rate regulation and strength of contraction, blood coagulation, the contraction of smooth and skeletal muscle cells, and the regulation of nerve impulse conduction. The average calcium level in the blood is about 10 mg/dL. When the body cannot maintain this level, a person will experience hypo or hypercalcemia.
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Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during...
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Regulation of hormone secretion is a finely tuned orchestration driven by various types of stimuli, encompassing neural, humoral, and hormonal signals. Environmental cues instigate neural stimuli, where action potentials traverse nerve fibers to reach their designated targets. An illustrative scenario is the body's response to stress, wherein the sympathetic nervous system releases epinephrine from the adrenal glands, inducing the well-known 'fight or flight' reaction.
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Related Experiment Video

Updated: Aug 2, 2025

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Osteocalcin modulates parathyroid cell function in human parathyroid tumors.

Chiara Verdelli1, Giulia Stefania Tavanti1,2, Irene Forno3

  • 1Laboratory of Experimental Endocrinology, IRCCS Istituto Ortopedico Galeazzi, Milan, Italy.

Frontiers in Endocrinology
|April 17, 2023
PubMed
Summary
This summary is machine-generated.

Osteocalcin (OC), a bone hormone, influences parathyroid tumor cells by modulating signaling pathways and apoptosis. This suggests the parathyroid gland is a new target for osteocalcin.

Keywords:
CASRERKGPRC6Abeta-cateninosteocalcinparathyroid tumor

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Area of Science:

  • Endocrinology
  • Oncology
  • Cell Biology

Background:

  • Osteocalcin (OC) is a bone matrix protein with known endocrine effects.
  • The role of OC in parathyroid tumor cell function remains largely unexplored.

Purpose of the Study:

  • To investigate the hypothesis that osteocalcin modulates parathyroid tumor cell function.
  • To explore the signaling pathways and cellular mechanisms involved in OC's effects on parathyroid cells.

Main Methods:

  • Primary parathyroid adenoma (PAd) cell cultures and HEK293 cells were utilized.
  • Experiments involved investigating the effects of γ-carboxylated OC (GlaOC) and uncarboxylated OC (GluOC) on intracellular signaling.
  • The expression of OC receptors, including GPRC6A and the calcium-sensing receptor (CASR), was analyzed.

Main Results:

  • Both GlaOC and GluOC modulated intracellular signaling in PAd cells, affecting pERK/ERK and β-catenin levels.
  • OC influenced the expression of key genes, including PTH, CCND1, CASR, CDKN1B/p27, TP73, and MEN1.
  • GlaOC and GluOC reduced apoptosis in PAd cells.
  • OC receptor GPRC6A expression correlated with CASR levels and patient calcium and PTH levels.
  • Modulation of signaling pathways by OC was primarily mediated through CASR activation.

Conclusions:

  • The parathyroid gland is identified as a novel endocrine target of osteocalcin.
  • Osteocalcin may modulate parathyroid tumor cell sensitivity to CASR and influence parathyroid cell apoptosis.