Implication of prostaglandins and histamine H1 and H2 receptors in radiation-induced temperature responses of rats

Journal Article · Fri Apr 01 00:00:00 EST 1988 · Radiat. Res.; (United States)

DOI:https://doi.org/10.2307/3577142· OSTI ID:7194953

Kandasamy, S B; Hunt, W A; Mickley, G A

Exposure of rats to 1-15 Gy gamma radiation (/sup 60/Co) induced hyperthermia, whereas 20-200 Gy induced hypothermia. Exposure either to the head or to the whole body to 10 Gy induced hyperthermia, while body-only exposure produced hypothermia. This observation indicates that radiation-induced fever is a result of a direct effect on the brain. The hyperthermia due to 10 Gy was significantly attenuated by the pre- or post-treatment with a cyclooxygenase inhibitor, indomethacin. Hyperthermia was also altered by the central administration of a mu-receptor antagonist naloxone but only at low doses of radiation. These findings suggest that radiation-induced hyperthermia may be mediated through the synthesis and release of prostaglandins in the brain and to a lesser extent to the release of endogenous opioid peptides. The release of histamine acting on H1 and H2 receptors may be involved in radiation-induced hypothermia, since both the H1 receptor antagonist, mepyramine, and H2 receptor antagonist, cimetidine, antagonized the hypothermia. The results of these studies suggest that the release of neurohumoral substances induced by exposure to ionizing radiation is dose dependent and has different consequences on physiological processes such as the regulation of body temperature. Furthermore, the antagonism of radiation-induced hyperthermia by indomethacin may have potential therapeutic implications in the treatment of fever resulting from accidental irradiations.

• Research Organization: Armed Forces Radiobiology Research Institute, Bethesda, MD (USA)
• OSTI ID: 7194953
• Journal Information: Radiat. Res.; (United States), Vol. 114:1
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BRAIN
BIOLOGICAL RADIATION EFFECTS
HISTAMINE
RECEPTORS
HYPERTHERMIA
RADIOINDUCTION
HYPOTHERMIA
PROSTAGLANDINS
BIOSYNTHESIS
SECRETION
BODY TEMPERATURE
COBALT 60
DOSE-RESPONSE RELATIONSHIPS
ENZYME INHIBITORS
GAMMA RADIATION
RATS
AMINES
ANIMALS
AZOLES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOLOGICAL EFFECTS
BODY
CENTRAL NERVOUS SYSTEM
COBALT ISOTOPES
ELECTROMAGNETIC RADIATION
HETEROCYCLIC COMPOUNDS
IMIDAZOLES
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IONIZING RADIATIONS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MAMMALS
MEMBRANE PROTEINS
MINUTES LIVING RADIOISOTOPES
NERVOUS SYSTEM
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANS
PROTEINS
RADIATION EFFECTS
RADIATIONS
RADIOISOTOPES
RODENTS
SYNTHESIS
VERTEBRATES
YEARS LIVING RADIOISOTOPES
560162* - Radionuclide Effects
Kinetics
& Toxicology- Animals
Plants
Microorganisms
& Cells