Prolactin-stimulated mitogenesis in the Nb2 rat lymphoma cell: Lack of protoporphyrin IX effects

Journal Article · Mon Jan 01 04:00:00 EST 1990 · Life Sciences; (USA)

DOI:https://doi.org/10.1016/0024-3205(90)90370-7· OSTI ID:6039050

Gerrish, K E; Putnam, C W; Laird, II, H E ^[1]

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1. Univ. of Arizona, Tucson (USA)

Pharmacological characterization of the Nb2 cell peripheral-type benzodiazepine receptor (PBR) was determined using selected 1,4-benzodiazepines, PK 11195, and protoporphyrin IX (PPIX) to compete for specific ({sup 3}H) Ro5-4864 binding. These data suggest that PPIX possesses an affinity for the Nb2 cell PBR. We have previously reported that the peripheral benzodiazepine ligands, Ro5-4864 and PK 11195, modulate prolactin-stimulated mitogenesis in the Nb2 cell. In contrast, PPIX, a putative endogenous ligand for the PBR had no effect on prolactin-stimulated mitogenesis in the Nb2 cell over the concentration range from 10{sup {minus}15} M to 10{sup {minus}6} M. Taken together these data show that PPIX has an affinity for the Nb2 cell PBR but does not modulate prolactin-stimulated mitogenesis at concentrations which should bind to the Nb2 cell PBR.

• OSTI ID: 6039050
• Journal Information: Life Sciences; (USA), Journal Name: Life Sciences; (USA) Vol. 47:18; ISSN 0024-3205; ISSN LIFSA
• Country of Publication: United States
• Language: English

Related Subjects

550201* -- Biochemistry-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
AFFINITY
ANIMAL CELLS
ANIMALS
AUTONOMIC NERVOUS SYSTEM AGENTS
BIOCHEMICAL REACTION KINETICS
CARBOXYLIC ACIDS
CHEMICAL COMPOSITION
DISEASES
DRUGS
GONADOTROPINS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HORMONES
HYDROGEN COMPOUNDS
IMMUNE SYSTEM DISEASES
ISOTOPE APPLICATIONS
KINETICS
LIGANDS
LTH
LYMPHOMAS
MAMMALS
MEMBRANE PROTEINS
NEOPLASMS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PARASYMPATHOMIMETICS
PEPTIDE HORMONES
PITUITARY HORMONES
PORPHYRINS
PROTEINS
RATS
REACTION KINETICS
RECEPTORS
RODENTS
TRACER TECHNIQUES
TRITIUM COMPOUNDS
TUMOR CELLS
VERTEBRATES