Xenopus oocytes express multiple receptors for LPA-like lipid mediators.
Am J Physiol
; 270(3 Pt 1): C772-7, 1996 Mar.
Article
en En
| MEDLINE
| ID: mdl-8638656
ABSTRACT
In Xenopus laevis oocytes, both lysophosphatidic acid (LPA) and a cyclic phosphate-containing analogue 1-acyl-sn-glycero-2,3-cyclic phosphate (cLPA) isolated from Physarum polycephalum activated oscillatory Cl- currents. cLPA elicited oscillatory currents only when applied extracellularly and, similarly to LPA, evoked homologous desensitization. cLPA applied to oocytes previously desensitized b y LPA failed to elicit a current, indicating that LPA completely desensitized the cLPA receptors. In contrast, when oocytes were desensitized by cLPA, LPA still evoked large currents. The lack of heterologous desensitization between cLPA and LPA indicates that the former acts on a distinct receptor subpopulation(s), which is also activated by LPA. The alkyl-ether analogue 1-hexadecyl-2-lyso-sn-glycero-3-phosphate (160-GP) and dioleoyl-phosphatidic acid (181-PA) showed heterologous desensitization patterns similar to that of LPA with regard to cLPA. Complete heterologous desensitization was obtained between LPA and 160-GP or 181-PA. These observations demonstrate the simultaneous expression of at least two different types of receptors for LPA-like lipid mediators on Xenopus oocytes and that these receptors show different pharmacological properties in their selectivity to cLPA.
Buscar en Google
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Oocitos
/
Lisofosfolípidos
/
Receptores de Superficie Celular
/
Receptores Acoplados a Proteínas G
Límite:
Animals
Idioma:
En
Revista:
Am J Physiol
Año:
1996
Tipo del documento:
Article
País de afiliación:
Estados Unidos