title: Administration of LHRH analog can improve working memory in aged female rats.
abstract: We had previously found that an age-related deficit in working memory appeared in middle-aged females, possibly related to their ageing reproductive system. This experiment investigates the effect of administering an analog of luteinizing hormone-releasing hormone (LHRH), D-Trp6-LHRH, to 22-mo-old female rats submitted to successive trainings in a water-reinforced matching to sample task since the age of three months. Animals were injected SC with a long-lasting microcapsule formulation (800 micrograms/kg continuously releasing 5 micrograms D-Trp6-LHRH per day for at least 28 days). The action of the analog on ovary weight and estradiol and progesterone levels was also studied. Administration of D-Trp6-LHRH counteracted the deleterious effect of age on performance and inhibited ovary function. However, hormone plasma levels were not modified. These results suggest that the hypothalamo-ovarian axis might be implicated in memory deficits of middle-aged females.
authors.affiliation: Laboratoire de Psychophysiologie et de Neuroendocrinologie, Université Blaise Pascal, Aubiere, France.
authors.forename: J
authors.initials: J
authors.lastname: Alliot
authors.forename: P
authors.initials: P
authors.lastname: Nauton
authors.forename: M A
authors.initials: MA
authors.lastname: Bruhat
mesh_terms: D000375:Aging / Q000187:drug effects / Q000502:physiology*; D000818:Animals; D001070:Appetitive Behavior / Q000187:drug effects / Q000502:physiology; D004193:Discrimination Learning / Q000187:drug effects / Q000502:physiology; D005260:Female; D011939:Mental Recall / Q000187:drug effects / Q000502:physiology*; D009949:Orientation / Q000187:drug effects / Q000502:physiology; D010053:Ovary / Q000187:drug effects / Q000502:physiology; D051381:Rats; D017208:Rats, Wistar; D012153:Retention, Psychology / Q000187:drug effects / Q000502:physiology; D017329:Triptorelin Pamoate / Q000494:pharmacology*
chemical_list: D017329:Triptorelin Pamoate