title: Effects of four tropical tanniniferous plant extracts on the inhibition of larval migration and the exsheathment process of Trichostrongylus colubriformis infective stage.
abstract: The anthelmintic (AH) effect of Acacia pennatula, Leucaena leucocephala, Lisyloma latisiliquum and Piscidia piscipula was evaluated in the infective larvae (L(3)) of Trichostrongylus colubriformis. Different concentrations of lyophilized extracts were tested using the larval migration inhibition (LMI) test. An inhibitor of tannins (the polyvinyl polypyrrolidone [PVPP]) was used to verify whether these compounds were responsible for the AH effects. Then, the effect of extracts on larval exsheathment was examined by observing the exsheathment process at 10-min intervals for 70 min. The LMI test showed a dose-dependant AH effect for A. pennatula, L. leucocephala and L. latisiliquum (P<0.01), but not for P. piscipula. The restoration of L(3) migration to values similar to those of controls after the addition of PVPP, indicates that tannins are involved in AH effects. Trichostrongylus colubriformis exsheathment was partially or totally blocked by the four plants extracts. Tropical tanniniferous plants evaluated in the current study may have potential as AH for the control of T. colubriformis if in vivo investigations indicate useful effects.
authors.affiliation: Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma de Yucatán, Km 15.5 Carretera Mérida-Xmatkuil, Mérida, Yucatán, Mexico.
authors.forename: M A
authors.initials: MA
authors.lastname: Alonso-Díaz
authors.forename: J F J
authors.initials: JF
authors.lastname: Torres-Acosta
authors.forename: C A
authors.initials: CA
authors.lastname: Sandoval-Castro
authors.forename: C
authors.initials: C
authors.lastname: Capetillo-Leal
authors.forename: S
authors.initials: S
authors.lastname: Brunet
authors.forename: H
authors.initials: H
authors.lastname: Hoste
mesh_terms: D000818:Animals; D000871:Anthelmintics / Q000737:chemistry / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D007814:Larva / Q000187:drug effects / Q000502:physiology; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology*; D018515:Plant Leaves / Q000737:chemistry; D013997:Time Factors; D014254:Trichostrongylus / Q000187:drug effects* / Q000502:physiology*; D014329:Tropical Climate
chemical_list: D000871:Anthelmintics; D010936:Plant Extracts