Hosobuchi Y, Meglio M, Adams J E, Li C H
Proc Natl Acad Sci U S A. 1977 Sep;74(9):4017-9. doi: 10.1073/pnas.74.9.4017.
Tolerance to beta-endorphin developed acutely in cats if the administration of the peptide was repeated within the first 24 hr. The tolerance was reversed immediately by systemic administration of the serotonin precursor, 5-hydroxytryptophan. It was further shown that 5-hydroxytryptophan potentiates the analgesic effect of the subliminal dose of beta-endorphin.
如果在最初24小时内重复给予肽类物质,猫会迅速产生对β-内啡肽的耐受性。通过全身给予血清素前体5-羟色氨酸,耐受性会立即逆转。进一步研究表明,5-羟色氨酸可增强阈下剂量β-内啡肽的镇痛效果。