title: Reduced ability of naloxone to stimulate LH and testosterone release in aging male rats; possible relation to increase in hypothalamic met5-enkephalin.
mesh_terms: D000375:Aging; D000818:Animals; D004723:Endorphins / Q000378:metabolism*; D004744:Enkephalin, Methionine; D004745:Enkephalins / Q000378:metabolism*; D007031:Hypothalamus / Q000378:metabolism; D007986:Luteinizing Hormone / Q000097:blood*; D008297:Male; D009020:Morphine / Q000494:pharmacology; D009270:Naloxone / Q000494:pharmacology*; D051381:Rats; D013739:Testosterone / Q000097:blood / Q000378:metabolism*
chemical_list: D004723:Endorphins; D004745:Enkephalins; D009270:Naloxone; D013739:Testosterone; D004744:Enkephalin, Methionine; D009020:Morphine; D007986:Luteinizing Hormone