Possible Involvement of Endogenous Opioid Peptides in the Inhibition of Arginine Vasopressin Release by γ-Aminobutyric Acid in Conscious Rats

1991 ◽  
Vol 54 (2) ◽  
pp. 170-174 ◽  
Author(s):  
Kazuo Otake ◽  
Kunikazu Kondo ◽  
Yutaka Oiso
Keyword(s):  
Arginine Vasopressin ◽  
Opioid Peptides ◽  
Aminobutyric Acid ◽  
Endogenous Opioid Peptides ◽  
Endogenous Opioid ◽  
Vasopressin Release ◽  
Conscious Rats

Effects of Naloxone on Vasopressin Secretion in Conscious Rats: Evidence for Inhibitory Role of Endogenous Opioid Peptides in Vasopressin Secretion*

Endocrinology ◽  
1989 ◽  
Vol 125 (2) ◽  
pp. 785-790 ◽  
Author(s):  
TAKAYUKI YAMADA ◽  
KAZUWA NAKAO ◽  
HIROSHI ITOH ◽  
GOTARO SHIRAKAMI ◽  
AKIRA SUGAWARA ◽  
...  
Keyword(s):  
Opioid Peptides ◽  
Endogenous Opioid Peptides ◽  
Endogenous Opioid ◽  
Conscious Rats ◽  
Inhibitory Role ◽  
Vasopressin Secretion

Do Endogenous Opioid Peptides Cause Hepatic Encephalopathy?

1987 ◽  
Vol 72 (s16) ◽  
pp. 90P-91P
Author(s):  
J.R. Thornton ◽  
M.S. Losowsky
Keyword(s):  
Hepatic Encephalopathy ◽  
Opioid Peptides ◽  
Endogenous Opioid Peptides ◽  
Endogenous Opioid

Met5-enkephalin protects isolated adult rabbit cardiomyocytes via δ-opioid receptors

1999 ◽  
Vol 277 (6) ◽  
pp. H2442-H2450 ◽  
Author(s):  
Yasushi Takasaki ◽  
Roger A. Wolff ◽  
Grace L. Chien ◽  
Donna M. van Winkle
Keyword(s):  
Cell Death ◽  
Opioid Receptors ◽  
Ischemic Preconditioning ◽  
Opioid Peptides ◽  
Trypan Blue ◽  
Adult Rabbit ◽  
Endogenous Opioid Peptides ◽  
Endogenous Opioid ◽  
Simulated Ischemia ◽  
Hypoxic Incubation

In rats and rabbits, endogenous opioid peptides participate in ischemic preconditioning. However, it is not known which endogenous opioid(s) can trigger cardioprotection. We examined preconditioning-induced and opioid-induced limitation of cell death in isolated, calcium-tolerant, adult rabbit cardiomyocytes. Cells were subjected to simulated ischemia by pelleting and normothermic hypoxic incubation. Preconditioning was elicited with 15 min of simulated ischemia followed by 15 min of resuspension and reoxygenation. All cells underwent 180 min of simulated ischemia. Cell death was assessed by trypan blue permeability. Morphine protected cells, as did preconditioning; naloxone blocked the preconditioning-induced protection. Exogenous Met5-enkephalin (ME) induced protection, but exogenous β-endorphin did not. ME-induced protection was blocked by the δ-selective antagonist naltrindole. Additionally, two other proenkephalin products, Leu5-enkephalin and Met5-enkephalin-Arg-Phe, provided protection equipotent to ME. These data suggest that one or more proenkephalin products interact with δ-opioid receptors to endogenously trigger opioid-mediated protection.

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