Dissociation between the inhibitory and stimulatory effects of opioid peptides on cAMP formation in SK-N-SH neuroblastoma cells.

Abstract:

:Opioid agonists either potentiate or suppress basal cAMP production in SK-N-SH cells. The inhibitory effect is mediated by PTX-sensitive GTP-binding proteins, while the stimulatory effect involves Ca++ entry and calmodulin activation. Both pathways can be activated simultaneously by opioid agonists. Low (nM) concentrations of either mu (DAMGO) or delta (DPDPE) selective opioids potentiate cAMP formation. At higher (100 nM) concentrations, however, a net suppression takes over; this suppression can be eliminated by PTX, and the underlying stimulatory effect is disclosed. Micromolar concentrations of either mu or delta selective agonists cross-activate the other (delta or mu) receptors, and augment the stimulatory pathway. The overall outcome (either stimulation or inhibition of cAMP production) is dependent on the balance between the two overlapping pathways, and can be modified by blocking either of the two opposing mechanisms.

authors

Sarne Y,Rubovitch V,Fields A,Gafni M

doi

10.1006/bbrc.1998.8582

subject

Has Abstract

pub_date

1998-05-08 00:00:00

pages

128-31

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(98)98582-5

journal_volume

246

pub_type

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