PMID- 3757772 OWN - NLM STAT- MEDLINE DCOM- 19861030 LR - 20190903 IS - 0376-8716 (Print) IS - 0376-8716 (Linking) VI - 17 IP - 4 DP - 1986 Jul TI - Development of morphine tolerance under tonic control of brain oxytocin. PG - 369-75 AB - Acute morphine tolerance was induced in mice by subcutaneous (s.c.) injection of a high dose (30 or 100 mg/kg) of morphine. The degree of tolerance was estimated 5 h later. Intracerebroventricular (i.c.v.) injection of graded doses of oxytocin (OXT) dose-dependently attenuated the development of tolerance. i.c.v. injection of a specific anti-OXT serum, on the other hand, facilitated the development of tolerance. Neither OXT nor anti-OXT serum had any effect on the pain sensitivity in morphine-naive mice; nor did these treatments modify the antinociceptive action of a single morphine treatment. It is concluded that the endogenous OXT of the mouse brain is normally involved in the adaptive response of the organism, leading to the development of morphine tolerance. FAU - Kovacs, G L AU - Kovacs GL FAU - Sarnyai, Z AU - Sarnyai Z FAU - Szabo, G AU - Szabo G FAU - Telegdy, G AU - Telegdy G LA - eng PT - Journal Article PL - Ireland TA - Drug Alcohol Depend JT - Drug and alcohol dependence JID - 7513587 RN - 0 (Immune Sera) RN - 50-56-6 (Oxytocin) RN - 76I7G6D29C (Morphine) SB - IM MH - *Adaptation, Physiological MH - Animals MH - Brain/physiology MH - Drug Tolerance MH - Immune Sera/pharmacology MH - Injections, Intraventricular MH - Male MH - Mice MH - Morphine/*pharmacology MH - Oxytocin/immunology/*physiology MH - Pain/physiopathology EDAT- 1986/07/01 00:00 MHDA- 1986/07/01 00:01 CRDT- 1986/07/01 00:00 PHST- 1986/07/01 00:00 [pubmed] PHST- 1986/07/01 00:01 [medline] PHST- 1986/07/01 00:00 [entrez] AID - 0376-8716(86)90087-6 [pii] AID - 10.1016/0376-8716(86)90087-6 [doi] PST - ppublish SO - Drug Alcohol Depend. 1986 Jul;17(4):369-75. doi: 10.1016/0376-8716(86)90087-6.