Journal article
Multiple lethal effects induced by a benzimidazole anthelmintic in the anterior intestine of the nematode Haemonchus contortus
Molecular and biochemical parasitology, Vol.105(1), pp.81-90
2000
Handle:
https://hdl.handle.net/2376/114388
PMID: 10613701
Abstract
A mechanism of benzimidazole efficacy against parasitic nematodes is postulated to involve inhibition of intestinal secretory vesicle transport via depolymerization of microtubules. We show that fenbendazole (FBZ) treatment of lambs causes pathology localized to the anterior intestine in the parasitic nematode
Haemonchus contortus. The pathology included gross disintegration of the anterior intestine, DNA fragmentation in anterior intestinal nuclei with characteristics of an apoptosis-like process, and inhibition of host erythrocyte digestion. These lethal effects were associated with inhibited transport of apical secretory vesicles in the anterior intestine, and then generalized dispersal of these vesicles–contents throughout the intestinal cytoplasm and worm body. Cytoplasmic accumulation of secretory vesicles and undigested erythrocytes preceded DNA fragmentation and vesicle–content dispersal. Both DNA fragmentation and vesicle–content dispersal were detected in disintegrated intestine and intestine that had not yet undergone disintegration. These pathologic effects in the anterior intestine appear sufficient to explain the efficacy of FBZ against adult
H. contortus. The results implicate mechanisms in the anterior intestine that govern dispersal of apical secretory vesicle contents, DNA fragmentation and tissue disintegration as effectors of this pathology.
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Details
- Title
- Multiple lethal effects induced by a benzimidazole anthelmintic in the anterior intestine of the nematode Haemonchus contortus
- Creators
- Douglas P Jasmer - Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA 99164-7040, USAChaoqun Yao - Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA 99164-7040, USAAbdur Rehman - Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA 99164-7040, USASandra Johnson - Pharmacia and Upjohn, Kalamazoo, MI, USA
- Publication Details
- Molecular and biochemical parasitology, Vol.105(1), pp.81-90
- Academic Unit
- Veterinary Microbiology and Pathology, Department of
- Publisher
- Elsevier B.V
- Identifiers
- 99900548232801842
- Language
- English
- Resource Type
- Journal article