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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effects of myenteric denervation on extracellular matrix fibers and mast cell distribution in normal stomach and gastric lesions

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Author(s):
Estofolete, Cassia F. [1] ; Botelho-Machado, Carla [1] ; Taboga, Sebastiao R. [2] ; Zucoloto, Sergio [3] ; Polli-Lopes, Ana Claudia [1] ; Gil, Cristiane D. [1]
Total Authors: 6
Affiliation:
[1] FAMERP, Sch Med, Dept Anat, BR-15090000 Sao Jose Do Rio Preto, SP - Brazil
[2] UNESP, IBILCE, Inst Biosci Humanities & Exact Sci, Dept Biol, BR-15054000 Sao Jose Do Rio Preto, SP - Brazil
[3] Univ Sao Paulo, FMRP, Sch Med, Dept Pathol, BR-14049900 Ribeirao Preto, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: CANCER CELL INTERNATIONAL; v. 10, JUN 22 2010.
Web of Science Citations: 2
Abstract

Background: In this study the effect of myenteric denervation induced by benzalconium chloride (BAC) on distribution of fibrillar components of extracellular matrix (ECM) and inflammatory cells was investigated in gastric carcinogenesis induced by N-methyl-N'-nitro-N-nitrosoguanidine (MNNG). Rats were divided in four experimental groups: non-denervated (I) and denervated stomach (II) without MNNG treatment; non-denervated (III) and denervated stomachs (IV) treated with MNNG. For histopathological, histochemical and stereological analysis, sections of gastric fragments were stained with Hematoxylin-Eosin, Picrosirius-Hematoxylin, Gomori reticulin, Weigert's Resorcin-Fuchsin, Toluidine Blue and Alcian-Blue/Safranin (AB-SAF). Results: BAC denervation causes an increase in the frequency of reticular and elastic fibers in the denervated (group II) compared to the non-denervated stomachs (group I). The treatment of the animals with MNNG induced the development of adenocarcinomas in non-denervated and denervated stomachs (groups III and IV, respectively) with a notable increase in the relative volume of the stroma, the frequency of reticular fibers and the inflammatory infiltrate that was more intense in group IV. An increase in the frequency of elastic fibers was observed in adenocarcinomas of denervated (group IV) compared to the non-denervated stomachs (group III) that showed degradation of these fibers. The development of lesions (groups III and IV) was also associated with an increase in the mast cell population, especially AB and AB-SAF positives, the latter mainly in the denervated group IV. Conclusions: The results show a strong association in the morphological alteration of the ECM fibrillar components, the increased density of mast cells and the development of tumors induced by MNNG in the non-denervated rat stomach or denervated by BAC. This suggests that the study of extracellular and intracellular components of tumor microenvironment contributes to understanding of tumor biology by action of myenteric denervation. (AU)

FAPESP's process: 08/05722-6 - Study of galectin-3 and Annexin-A1 expression in the inflammatory cells during experimental model of gastric tumorigenesis in rats
Grantee:Cássia Fernanda Estofolete
Support Opportunities: Scholarships in Brazil - Scientific Initiation