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International Journal of Morphology

On-line version ISSN 0717-9502

Abstract

FLETES-ARJONA, Víctor M et al. Morphologic Alterations in the Respiratory Tract of Wistar Rats Induced by Steams of the Root of Hierba del Zorrillo (Petiveria alliacea) from Southwest of Mexico. Int. J. Morphol. [online]. 2013, vol.31, n.1, pp.121-127. ISSN 0717-9502.  http://dx.doi.org/10.4067/S0717-95022013000100019.

Petiveria alliacea, is known with different names depending of the place where it is found. Studies with leaves, stem, root or extracts, describe multiple medicinal uses. However, there are few reports that describe toxic effects. This study assessed the morphologic effect induced by steams of the root of P. alliacea on the respiratory tract of Wistar rats. We used 15 rats divided in 5 groups (n= 3): absolute control, 0, 5, 15 and 30 minutes post-exposure (I-V groups, respectively). The rats were sacrificed; representative samples of the respiratory tract were collected, and were processed by conventional histological technique until their inclusion in paraffin blocks. Histological sections were stained with H & E, Masson trichrome and toluidine blue stain. A normal histology was observed in trachea, bronchioles and lungs of rats in groups I and II. In trachea in groups III, IV and V, areas with variable hyperplasia in the epithelium, cells without cilia, increase in the secretion of goblet cells, and areas without epithelium were observed. These morphologic alterations were increased with time. In the lamina propia vascular congestion and mononuclear infiltrate were observed, also increasing with time. In bronchioles in groups III and IV, it was noted activation of Clara cells, areas without epithelium, and mononuclear cells in the bronchiolar light. In group V normal histology was observed. In lung in groups III and IV thickening of interalveolar septa, increase of collagen fibers, capillary congestion, extravasation, and exudates were present. Also was observed an apparent reversion of morphologic alterations of previous groups, but other alterations persist. No difference in mast cells number was observed.

Keywords : Petiveria alliacea; Morphologic alterations; Respiratory tract.

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