Abstract
α-Taxilin, a binding partner of the syntaxin family, is a candidate tumor marker. To gain insight into the physiological role of α-taxilin in normal tissues, we examined α-taxilin expression by Western blot and performed immunochemical analysis in the murine gastrointestinal tract where cell renewal vigorously occurs. α-Taxilin was expressed in the majority of the gastrointestinal tract and was prominently expressed in epithelial cells positive for Ki-67, a marker of actively proliferating cells. In the small intestine, α-taxilin was expressed in transient-amplifying cells and crypt base columnar cells intercalated among Paneth cells. In the corpus and antrum of the stomach, α-taxilin was expressed in cells localized in the lower pit and at the gland, respectively, but not in parietal or zymogenic cells. During development of the small intestine, α-taxilin was expressed in Ki-67-positive regions. Inhibition of cell proliferation by suppression of the Notch cascade using a γ-secretase inhibitor led to a decrease in α-taxilin- and Ki-67-positive cells in the stomach. These results suggest that expression of α-taxilin is regulated in parallel with cell proliferation in the murine gastrointestinal tract.
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Acknowledgments
We thank Mayumi Ohshima and Akemi Akima for their skillful assistance. This work was supported by a Grants-in-Aid for scientific research from the Ministry of Education, Culture, Sports, Science and Technology, Japan (2012).
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Yukimi Horii and Hiroshi Sakane have contributed equally to this work.
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Horii, Y., Sakane, H., Nogami, S. et al. Expression of α-taxilin in the murine gastrointestinal tract: potential implication in cell proliferation. Histochem Cell Biol 141, 165–180 (2014). https://doi.org/10.1007/s00418-013-1147-0
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DOI: https://doi.org/10.1007/s00418-013-1147-0