Omega 3 (peripheral type benzodiazepine binding) site distribution in the rat immune system: an autoradiographic study with the photoaffinity ligand (/sup 3/H)PK 14105

Journal Article · Sat Apr 01 00:00:00 EST 1989 · J. Pharmacol. Exp. Ther.; (United States)

OSTI ID:6080608

Benavides, J; Dubois, A; Dennis, T; Hamel, E; Scatton, B

The anatomical distribution of omega 3 (peripheral type benzodiazepine binding) sites in the immune system organs of the rat has been studied autoradiographically at both macroscopic and microscopic levels of resolution using either reversible or irreversible (UV irradiation) labeling with (/sup 3/H)PK 14105. In thymus sections, (/sup 3/H)PK 14105 labeled with high affinity (Kd, derived from saturation experiments = 10.8 nM) a single population of sites which possessed the pharmacological characteristics of omega 3 sites. In the thymus gland, higher omega 3 site densities were detected in the cortex than in the medulla; in these subregions, silver grains were associated to small (10-18 microns diameter) cells. In the spleen, omega 3 sites were more abundant in the white than in the red pulp. In the white pulp, silver grains were denser in the marginal zone than in the vicinity of the central artery and labeling was, as in the thymus, associated to small cytoplasm-poor cells. In the red pulp, omega 3 site associated silver grains were observed mainly in the Bilroth cords. In the lymph nodes, the medullary region showed a higher labeling than the surrounding follicles and paracortex. A significant accumulation of silver grains was observed in the lymph node medullary cords. In the intestine, Peyer patches were particularly enriched in omega 3 sites (especially in the periphery of the follicles). The distribution of omega 3 sites in the immune system organs suggests a preferential labeling of cells of T and monocytic lineages. This is consistent with the proposed immunoregulatory properties of some omega 3 site ligands.

• Research Organization: Synthelabo Recherche (Laboratoires d'Etudes et de Recherches Synthelabo), Bagneux (France)
• OSTI ID: 6080608
• Journal Information: J. Pharmacol. Exp. Ther.; (United States), Vol. 249:1
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
RECEPTORS
TISSUE DISTRIBUTION
TRANQUILIZERS
AUTORADIOGRAPHY
BIOCHEMICAL REACTION KINETICS
LIGANDS
LYMPHOCYTES
RATS
RETICULOENDOTHELIAL SYSTEM
THYMUS
TRITIUM COMPOUNDS
ANIMAL CELLS
ANIMAL TISSUES
ANIMALS
BIOLOGICAL MATERIALS
BLOOD
BLOOD CELLS
BODY
BODY FLUIDS
CENTRAL NERVOUS SYSTEM AGENTS
CONNECTIVE TISSUE CELLS
DISTRIBUTION
DRUGS
KINETICS
LABELLED COMPOUNDS
LEUKOCYTES
LYMPHATIC SYSTEM
MAMMALS
MATERIALS
MEMBRANE PROTEINS
ORGANIC COMPOUNDS
ORGANS
PROTEINS
PSYCHOTROPIC DRUGS
REACTION KINETICS
RODENTS
SOMATIC CELLS
TISSUES
VERTEBRATES
550201* - Biochemistry- Tracer Techniques