In this study, we investigated the effects of the peripheral benzodiazepine ligands, Ro5-4864 (putative antagonist) and PK 11195 (putative antagonist) on prolactin stimulated mitogenesis in Nb2 cells. Ro5-4864 and PK 11195 at 10⁻⁹ M maximally enhanced prolactin stimulated mitogenesis. At 10⁻⁶ M Ro5-4864 inhibited prolactin stimulated mitogenesis. Clonazepam, a ligand for the central benzodiazepine receptor had no effect on mitogenesis. Interaction studies were undertaken to determine if Ro5-4864 and PK 11195 act on the same site. The ability of each ligand to enhance the mitogenic action of prolactin was blocked by a 10⁻⁶ M concentration of the other ligand. Finally, simultaneous addition of 10⁻⁹ M of the ligands resulted in no additive effect over each ligand alone. These data show that peripheral benzodiazepine ligands modulate prolactin-stimulated mitogenesis and suggests they interact at the same binding site.
| Identifer | oai:union.ndltd.org:arizona.edu/oai:arizona.openrepository.com:10150/277200 |
| Date | January 1989 |
| Creators | Gerrish, Kevin Edward, 1965- |
| Contributors | Laird, Hugh E. |
| Publisher | The University of Arizona. |
| Source Sets | University of Arizona |
| Language | en_US |
| Detected Language | English |
| Type | text, Thesis-Reproduction (electronic) |
| Rights | Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author. |
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