Efficacy of condensed tannins against larval Hymenolepis diminuta (Cestoda) in vitro and in the intermediate host Tenebrio molitor (Coleoptera) in vivo

TY - JOUR

T1 - Efficacy of condensed tannins against larval Hymenolepis diminuta (Cestoda) in vitro and in the intermediate host Tenebrio molitor (Coleoptera) in vivo

AU - Dhakal, Suraj

AU - Meyling, Nicolai Vitt

AU - Williams, Andrew Richard

AU - Mueller-Harvey, Irene

AU - Fryganas, Christos

AU - Kapel, Christian Moliin Outzen

AU - Fredensborg, Brian Lund

PY - 2015/1/15

Y1 - 2015/1/15

N2 - Natural anti-parasitic compounds in plants such as condensed tannins (CT) have anthelmintic properties against a range of gastrointestinal nematodes, but for other helminths such effects are unexplored. The aim of this study was to assess the effects of CT from three different plant extracts in a model system employing the rat tapeworm, Hymenolepis diminuta, in its intermediate host, Tenebrio molitor. An in vitro study examined infectivity of H. diminuta cysticercoids (excystation success) isolated from infected beetles exposed to different concentrations of CT extracts from pine bark (PB) (. Pinus sps), hazelnut pericarp (HN) (. Corylus avellana) or white clover flowers (WC) (. Trifolium repens), in comparison with the anthelmintic drug praziquantel (positive control). In the in vitro study, praziquantel and CT from all three plant extracts had dose-dependent inhibitory effects on cysticercoid excystation. The HN extract was most effective at inhibiting excystation, followed by PB and WC. An in vivo study was carried out on infected beetles (measured as cysticercoid establishment) fed different doses of PB, HN and praziquantel. There was a highly significant inhibitory effect of HN on cysticercoid development (. p=. 0.0002). Overall, CT showed a promising anti-cestodal effect against the metacestode stage of H. diminuta.

AB - Natural anti-parasitic compounds in plants such as condensed tannins (CT) have anthelmintic properties against a range of gastrointestinal nematodes, but for other helminths such effects are unexplored. The aim of this study was to assess the effects of CT from three different plant extracts in a model system employing the rat tapeworm, Hymenolepis diminuta, in its intermediate host, Tenebrio molitor. An in vitro study examined infectivity of H. diminuta cysticercoids (excystation success) isolated from infected beetles exposed to different concentrations of CT extracts from pine bark (PB) (. Pinus sps), hazelnut pericarp (HN) (. Corylus avellana) or white clover flowers (WC) (. Trifolium repens), in comparison with the anthelmintic drug praziquantel (positive control). In the in vitro study, praziquantel and CT from all three plant extracts had dose-dependent inhibitory effects on cysticercoid excystation. The HN extract was most effective at inhibiting excystation, followed by PB and WC. An in vivo study was carried out on infected beetles (measured as cysticercoid establishment) fed different doses of PB, HN and praziquantel. There was a highly significant inhibitory effect of HN on cysticercoid development (. p=. 0.0002). Overall, CT showed a promising anti-cestodal effect against the metacestode stage of H. diminuta.

U2 - 10.1016/j.vetpar.2014.11.006

DO - 10.1016/j.vetpar.2014.11.006

M3 - Journal article

C2 - 25468673

SN - 0304-4017

VL - 207

SP - 49

EP - 55

JO - Veterinary Parasitology

JF - Veterinary Parasitology

IS - 1-2

ER -