Distinct angiotensin II receptor in primary cultures of glial cells from rat brain

Journal Article · Wed Jul 01 04:00:00 EDT 1987 · Proc. Natl. Acad. Sci. U.S.A.; (United States)

DOI:https://doi.org/10.1073/pnas.84.13.4655· OSTI ID:5315449

Raizada, M K; Phillips, M I; Crews, F T; Sumners, C

Angiotensin II (Ang-II) has profound effects on the brain. Receptors for Ang-II have been demonstrated on neurons, but no relationship between glial cells and Agn-II has been established. Glial cells (from the hypothalamus and brain stem of 1-day-old rat brains) in primary culture have been used to demonstrate the presence of specific Ang-II receptors. Binding of /sup 125/I-Ang-II to glial cultures was rapid, reversible, saturable, and specific for Ang-II. The rank order of potency of /sup 125/I-Ang-II binding was determined. Scatchard analysis revealed a homogeneous population of high-affinity binding sites with a B/sub max/ of 110 fmol/mg of protein. Light-microscopic autoradiography of /sup 125/I-Ang-II binding supported the kinetic data, documenting specific Ang-II receptors on the glial cells. Ang-II stimulated a dose-dependent hydrolysis of phosphatidylinositols in glial cells, an effect mediated by Ang-II receptors. However, Ang-II failed to influence (/sup 3/H) norepinephrine uptake, and catecholamines failed to regulate Ang-II receptors, effects that occur in neurons. These observations demonstrate the presence of specific Ang-II receptors on the glial cells in primary cultures derived from normotensive rat brain. The receptors are kinetically similar to, but functionally distinct from, the neuronal Ang-II receptors.

• Research Organization: Univ. of Florida, Gainesville (USA)
• OSTI ID: 5315449
• Journal Information: Proc. Natl. Acad. Sci. U.S.A.; (United States), Journal Name: Proc. Natl. Acad. Sci. U.S.A.; (United States) Vol. 84:13; ISSN PNASA
• Country of Publication: United States
• Language: English

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59 BASIC BIOLOGICAL SCIENCES
62 RADIOLOGY AND NUCLEAR MEDICINE
ADRENAL HORMONES
ANGIOTENSIN
ANIMAL CELLS
ANIMALS
AUTONOMIC NERVOUS SYSTEM AGENTS
AUTORADIOGRAPHY
BIOCHEMICAL REACTION KINETICS
BODY
BRAIN
CARDIOTONICS
CARDIOVASCULAR AGENTS
CELL CULTURES
CENTRAL NERVOUS SYSTEM
CONFIGURATION INTERACTION
DOSE-RESPONSE RELATIONSHIPS
DRUGS
GLOBULINS
HORMONES
KINETICS
LABELLED COMPOUNDS
MAMMALS
MEMBRANE PROTEINS
NERVE CELLS
NERVOUS SYSTEM
NEUROREGULATORS
NORADRENALINE
ORGANIC COMPOUNDS
ORGANS
PROTEINS
RATS
REACTION KINETICS
RECEPTORS
RODENTS
SOMATIC CELLS
STEROID HORMONES
SYMPATHOMIMETICS
TRITIUM COMPOUNDS
VASOCONSTRICTORS
VERTEBRATES