Protein Information

Name beta endorphin
Synonyms Beta endorphin; endorphin; B endorphin; Beta endorphin

Compound Information

Name methyl bromide
CAS bromomethane

Reference List

PubMed Abstract RScore(About this table)
2454493 Amir S: Anaphylactic shock: catecholamine actions in the responses to opioid antagonists. Prog Clin Biol Res. 1988;264:265-74.

The pathophysiological consequences of endorphin release in anaphylactic shock were investigated through pharmacological studies using opiate antagonists (naloxone, naltrexone, natrexone methyl bromide) as well as agonists (morphine, beta-endorphin).
83(1,1,1,3) Details
2137676 Hargreaves KM, Flores CM, Dionne RA, Mueller GP: The role of pituitary beta-endorphin in mediating corticotropin-releasing factor-induced antinociception. Am J Physiol. 1990 Feb;258(2 Pt 1):E235-42.

Furthermore, the effect of CRF was antagonized by 1) naltrexone, 2) naltrexone methyl bromide, and 3) passive immunization with anti-beta-endorphin antiserum.
34(0,1,1,4) Details
2935140 Introini IB, McGaugh JL, Baratti CM: Pharmacological evidence of a central effect of naltrexone, morphine, and beta-endorphin and a peripheral effect of met- and leu-enkephalin on retention of an inhibitory response in mice. Behav Neural Biol. 1985 Nov;44(3):434-46.

The peripheral-acting opioid receptor blocker, naltrexone methyl bromide (MR 2263) (0.01-10.00 mg/kg), did not significantly influence retention latencies of either shocked or unshocked mice.
2(0,0,0,2) Details
2823789 Baratti CM: The impairment of retention induced by pentylenetetrazol in mice may be mediated by a release of opioid peptides in the brain. Behav Neural Biol. 1987 Sep;48(2):183-96.

On the contrary, neither naltrexone methyl bromide (0.01, 0.10, or 10.0 mg/kg, ip), a quaternarium analog of naltrexone, nor MR2266 (0.01 or 0.10 mg/kg, ip), a putative kappa opiate receptor antagonist, modified the behavioral effects of PTZ.
Administration of beta-endorphin (0.01 or 0.10 microgram/kg, ip) 10 min prior to testing attenuate the retrograde amnesia caused by PTZ.
2(0,0,0,2) Details
3104708 Buydens P, Velkeniers B, Golstein J, Finne E, Vanhaelst L: Opioid modulation of thyrotropin releasing hormone induced prolactin secretion. Life Sci. 1987 Mar 23;40(12):1207-14.

A beta-endorphin (beta EP) injection in the third ventricle stimulated PRL secretion and induced furthermore a PRL secretory reaction to TRH injected intravenously 20 min later.
Pretreatment with naloxone methyl bromide (Br-naloxone), a quaternary naloxone derivative, which does not cross the blood-brain barrier, had no effect on the PRL response to beta EP but prevented the conjugated effect of beta EP and TRH on PRL secretion.
1(0,0,0,1) Details
2087144 Baratti CM, de Erausquin GA, Faiman CP: Brain opioid peptides may participate in the reversal of pentylenetetrazol-induced amnesia. Methods Find Exp Clin Pharmacol. 1990 Sep;12(7):451-6.

The effect was reversed by any of the following treatments given 1 h prior to testing: a) a beta-endorphin injection (0.1 microgram/kg, i.p.), b) PTZ injection, or c) exposure to a novel experience (10 min in a stainless steel box with a wire mesh top).
All treatments had a similar time course of effectiveness (up to at least 3 h) and their effects were blocked by naltrexone (0.1 mg/kg, i.p.) but not by naltrexone methyl bromide (10 mg/kg, i.p.).
1(0,0,0,1) Details
6722534 Amir S: Naloxone improves, and morphine exacerbates, experimental shock induced by release of endogenous histamine by compound 48/80. Brain Res. 1984 Apr 9;297(1):187-90.

In mice, fatal shock induced by release of endogenous histamine by compound 48/80 was reversed by the intracerebroventricular (i.c.v.) administration of the opiate antagonist naloxone (10-25 micrograms) but not by the systemic administration of the selective peripherally acting antagonist, naltrexone methyl bromide (1-5 mg/kg).
The results suggest possible involvement of central opiate (endorphin) mechanisms in the pathophysiology of fatal histamine shock in mice.
1(0,0,0,1) Details