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Related Experiment Videos

Decrease in salivary secretion by radiation mediated by nitric oxide and prostaglandins.

Carolina de la Cal1, Alejandro Lomniczi, Claudia E Mohn

  • 1Cátedra de Fisiología, Facultad de Odontología, Universidad de Buenos Aires, Buenos Aires, Argentina.

Neuroimmunomodulation
|May 13, 2006
PubMed
Summary
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Radiation exposure significantly reduces salivary secretion and submandibular gland nitric oxide synthase activity. However, it increases prostaglandin E content, lipid peroxidation, and apoptosis, ultimately impairing salivary function.

Area of Science:

  • Physiology
  • Radiation Biology
  • Cellular Biology

Background:

  • Head and neck radiation therapy can cause salivary gland dysfunction.
  • Submandibular glands (SMG) play a crucial role in saliva production.
  • Understanding radiation's impact on SMG function is vital for managing treatment side effects.

Purpose of the Study:

  • To investigate the effects of gamma-ray radiation on SMG functional parameters.
  • To analyze changes in salivary secretion, nitric oxide (NO) production, reactive oxygen species (ROS), prostaglandin E (PGE) content, and apoptosis post-irradiation.

Main Methods:

  • Rats were exposed to a single 15 Gy dose of gamma radiation to the head and neck.
  • Salivary secretion was measured following norepinephrine administration.

Related Experiment Videos

  • SMG tissue was analyzed for NO synthase (NOS) activity, PGE content, ROS levels, apoptotic cells, and mitochondrial inducible NOS (iNOS) expression.

    • Main Results:

    • Radiation decreased norepinephrine-induced salivary secretion.
    • SMG iNOS activity was reduced, while PGE content increased.
    • Apoptosis and lipid peroxidation were significantly elevated in irradiated SMG.

    Conclusions:

    • Radiation exposure negatively impacts SMG function, leading to decreased salivary secretion.
    • Increased PGE, lipid peroxidation, and apoptosis contribute to radiation-induced salivary hypofunction.
    • These findings highlight the complex cellular mechanisms underlying radiation-induced salivary damage.