Immunohistochemical localization of anterior pituitary cell types of vervet monkey (Chlorocebus aethiops) following sub-chronic cathinone exposure

Albert Nyongesa, Jemimah Oduma, Mustafa Al'Absi, Sanika Chirwa

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Ethnopharmacological relevance Khat (Catha edulis) contains cathinone, an active principal that is customarily used as a psychostimulant that wards off fatigue and to some extent used as an aphrodisiac. Aim of study To investigate effects of escalating doses of cathinone on hormone expression by different anterior pituitary cell types using specific antibodies. Material and methods Eleven vervet monkeys (6 males and 5 females) divided into tests (n=9) and controls (n=2) were used. Animals were allocated as group I (saline controls), group II (0.8 mg/kg), group III (3.2 mg/kg) and group IV (6.4 mg/kg) of cathinone. All treatments were via oral route at alternate days of each week. At the end of 4-month treatment phase, GnRH agonist (ZOLADEX) was administered to group II (low dose) and group IV (high dose) alongside cathinone for 2 additional weeks. Results High cathinone dose at long-term exposure caused proliferation of gonadotrophs but decrease in lactotrophs and corticotrophs in anterior pituitary sections of animals while effect of low dose on these cells was insignificant. Subsequent GnRH agonist co-treatment with low and high cathinone doses enhanced gonadotroph proliferation but no change on decline of lactotrophs and corticotrophs. Conclusion We believe that there was a possible potentiation of cathinone on pituitary hormone synthesis thereby influencing reproductive function. Suppression of corticotrophic and lactotrophic functions suggest lowering of stress levels and modulation of reproductive function based on dose level and chronicity of exposure. The findings are consistent with the hypothesis that cathinone interferes with pituitary cell integrity and consequently target organs, but further studies are required to address the precise mechanism underlying this phenomenon.

Original languageEnglish (US)
Article number9672
Pages (from-to)168-177
Number of pages10
JournalJournal of Ethnopharmacology
Volume174
DOIs
StatePublished - Aug 12 2015
Externally publishedYes

Keywords

  • HPA axis
  • Immunohistochemistry
  • Monkey
  • Pituitary

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