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Related Concept Videos

The Pineal Gland01:02

The Pineal Gland

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The pineal gland, a diminutive endocrine structure named for its pinecone-shaped appearance, is situated atop the third ventricle within the diencephalon region of the forebrain. This gland, composed of secretory cells known as pinealocytes arranged in compact cords and clusters around dense particles of calcium salts, plays a pivotal role in hormonal regulation.
The primary secretion of the pineal gland is the hormone melatonin, derived from serotonin. The concentration of melatonin in the...
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Synthesis and Functions of Calcitonin00:51

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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.
The exact mechanisms by which calcitonin operates in calcium homeostasis remain elusive, but its significance is evident in several vital...
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Hypoxia01:23

Hypoxia

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Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
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Related Experiment Video

Updated: Dec 27, 2025

Characterization of Calcification Events Using Live Optical and Electron Microscopy Techniques in a Marine Tubeworm
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Pineal gland calcification under hypoxic conditions.

M Kopáni1, B Vraníková, D Kosnáč

  • 1Institute of Medical Physics, Biophysics, Informatics and Telemedicine, Faculty of Medicine, Comenius University, Bratislava, Slovakia. martin.kopani@fmed.uniba.sk.

Physiological Research
|March 3, 2020
PubMed
Summary
This summary is machine-generated.

Prenatal hypoxia in rats influences pineal gland calcification, with more calcium particles observed after 12 hours of exposure. Melatonin levels remained unchanged, suggesting hypoxia promotes calcification under specific conditions.

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Area of Science:

  • Neuroendocrinology
  • Developmental Biology
  • Pathology

Background:

  • The pineal gland, a neuroendocrine structure, secretes melatonin and is located in the epithalamus.
  • Pineal gland calcification is a common phenomenon, but its developmental origins and influencing factors require further investigation.
  • Prenatal hypoxia, a condition of reduced oxygen supply during development, may impact brain structures and functions.

Purpose of the Study:

  • To investigate the effects of prenatal hypoxia on pineal gland calcification in adult rats.
  • To analyze the distribution and chemical composition of calcified material in the pineal gland.
  • To assess plasma melatonin levels in rats exposed to prenatal hypoxia.

Main Methods:

  • Rats were exposed to two different prenatal hypoxia protocols (12h or 2x8h) at critical developmental stages.
  • Pineal gland tissues were examined using light, scanning, and transmission electron microscopy.
  • Plasma melatonin concentrations were measured using direct radioimmunoassay.

Main Results:

  • Prenatal hypoxia induced intracellular and pericellular edema in the pineal gland.
  • A higher amount of calcium-rich particles was observed in the pineal glands of rats exposed to 12h of hypoxia compared to the 2x8h group.
  • Plasma melatonin levels showed no significant difference between control and hypoxia-exposed groups.

Conclusions:

  • Prenatal hypoxia can alter the pineal gland's structure and calcification process.
  • Melatonin may act as a promoter in pineal gland calcification, which is favored under hypoxic conditions.
  • Osteoblasts and osteocytes are implicated in the process of pineal gland calcification.