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. 1986 Nov 15;240(1):189–196. doi: 10.1042/bj2400189

Characterization of specific V1a vasopressin-binding sites on a rat mammary-tumour-cell line.

G Guillon, C J Kirk, M N Balestre
PMCID: PMC1147392  PMID: 3030277

Abstract

WRK 1, a cloned cell line derived from a rat mammary tumour, carries specific vasopressin-binding sites. Specific binding of 2-tyrosine-3H-labelled [8-lysine]vasopressin ([3H]vasopressin) was time-dependent, saturable and reversible. Scatchard-plot analysis of hormone binding indicated the presence of a single class of receptors with an equilibrium dissociation constant of 12.7 +/- 0.2 nM. The maximal binding capacity was 75 +/- 6 fmol/10(6) cells, which corresponds to approx. 45,000 sites per cell. Oxytocin and a highly potent oxytocin analogue were able to inhibit completely [3H]vasopressin binding, but, in this respect, they were far less potent than vasopressin. This clearly demonstrates the vasopressinergic nature of this receptor. Pharmacological studies using a series of 14 vasopressin or oxytocin analogues indicated that the ligand selectivity of the vasopressin receptor found on WRK 1 cells resembles that of the rat hepatocyte. This signifies that this vasopressin receptor is of the V1a subtype. This conclusion was confirmed by the observation that vasopressin did not influence the production of intracellular cyclic AMP in WRK 1 cells.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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