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Brugia malayi, Brugia pahangi, and Brugia patei: pulmonary pathology in jirds, Meriones unguiculatus

Brugia malayi, Brugia pahangi, and Brugia patei: pulmonary pathology in jirds, Meriones unguiculatus

Experimental Parasitology 40(3): 330-354

ISSN/ISBN: 0014-4894

PMID: 976421

DOI: 10.1016/0014-4894(76)90100-4

The chronological development of pulmonary lesions due to subperiodic B. malayi and related species was studied in M. unguiculatus. Major pathologic changes included granulomas induced by larvae and adults, obstructive endarteritis, and chronic interstitial inflammation with degenerating microfilariae. The majority of pulmonary granulomas were initiated near the time of the final molt, about 30 days postinoculation, followed by involution and formation of residual vascular lesions over the next several months. A minority of granulomas arose about sexually mature adult worms and showed a characteristic sequence of development along the length of these worms. Ultrastructural observations suggested that within granulomas internal structures of the worm underwent an autolytic-like disintegration, while the cuticle remained intact. A material, presumably of parasitic origin, then appeared between the cuticle and adherent epitheloid and giant cells and was subsequently phagocytized by these cells. Obstructive endarteritis appeared to peak at about the time of the final molt, and became largely fibrotic by 125 days postinoculation; electron microscopy of the subintimal infiltrates revealed a variety of cells including inflammatory cells and others interpreted as modified cells of vascular origin (smooth muscle cells and 2 types of endothelial cells). Parasitological data suggested that larvae and adults migrated to the lungs and that mating occurred here, rather than in peripheral sites of development. In terms of development, reproduction and survival, the pulmonary arteries of the male jird offered a suitable alternative for the localization of these primarily lymphatic filariae; apparently the pulmonary localization of these worms should not be considered indicative of an aberrant mode of development. The failure of female jirds to develop detectable peripheral microfilaremia was associated with a high rate of infertility among female worms, rather than pulmonary sequestration or destruction of microfilariae.

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Accession: 004861899

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