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. 1996 Dec;189(Pt 3):623–630.

Distribution of alpha-vascular smooth muscle actin in the smooth muscle cells of the gastrointestinal tract of the chicken.

Y Yamamoto 1, T Kubota 1, Y Atoji 1, Y Suzuki 1
PMCID: PMC1167705  PMID: 8982838

Abstract

Immunoreactivity specific for alpha-vascular smooth muscle actin (ASMA) was examined in the enteric smooth muscle cells along the entire length of the gastrointestinal tract of the chicken. Specificity for gamma-smooth muscle actin (GSMA) and desmin was also examined. All smooth muscle layers, i.e. the muscularis mucosae, and the circular and longitudinal muscle layers, showed immunoreactivity specific for GSMA and desmin throughout the gastrointestinal tract whereas immunoreactivity for ASMA differed between regions and muscle layers. In the oesophagus and crop, immunoreactivity for ASMA was observed in the muscularis mucosae and the inner and outer muscle layers, together with staining for GSMA and desmin. In the proventriculus, immunoreactivity for ASMA was observed in all smooth muscle cells in the inner layer of the muscularis mucosae and the longitudinal muscle layer. In the outer layer of the muscularis mucosae, immunoreactivity for ASMA on smooth muscle cells was observed on the luminal side and decreased in the serosal direction. In the intermediate muscles, immunoreactivity for ASMA was observed in the luminal portion, the intensity of staining decreasing gradually in the serosal direction. In contrast to the intermediate muscles, the latter muscles were negative for ASMA. In the pyloric region, the outer part was weakly immunopositive, while the inner part was intensely positive. In the small and large intestines, the muscularis mucosae and the longitudinal muscle layer were positive for ASMA. The outer part of the circular muscle layer was immunonegative for ASMA whereas the inner part was positive. The complex structure and contractile functions of each organ and muscle layers may be related to the difference patterns of expression of ASMA molecules in the smooth muscle cells.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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