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Originally published as JHC exPRESS on December 12, 2006.
doi:10.1369/jhc.6A7033.2006
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Journal of Histochemistry and Cytochemistry
Volume 55 (3): 301-311, 2007
Copyright ©The Histochemical Society, Inc.

Tissue Distribution of Ca2+-dependent Activator Protein for Secretion Family Members CAPS1 and CAPS2 in Mice

Tetsushi Sadakata, Miwa Washida, Noriyuki Morita and Teiichi Furuichi

Laboratory for Molecular Neurogenesis, RIKEN Brain Science Institute, Wako, Saitama, Japan

Correspondence to: Teiichi Furuichi, PhD, Laboratory for Molecular Neurogenesis, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan. E-mail: tfuruichi{at}brain.riken.jp

The family of Ca2+-dependent activator proteins for secretion (CAPS) is involved in dense-core vesicle exocytosis. CAPS1/CADPS1 and CAPS2/CADPS2 have been identified in mammals. CAPS1 regulates catecholamine release from neuroendocrine cells, whereas CAPS2 is involved in the release of brain-derived neurotrophic factor and neurotrophin-3 from cerebellar granule cells. CAPS1 and CAPS2 are predominantly expressed in brain. Here we show the immunohistochemical localization of the CAPS family proteins in various mouse tissues. In the pituitary gland, CAPS1 and CAPS2 were localized to the pars nervosa and the pars intermedia, respectively. In non-neural tissues, CAPS1 was observed in the islets of Langerhans, minor cell types of the spleen and stomach, and medullary cells of the adrenal gland, whereas CAPS2 was present in bronchial epithelial cells, thyroid parafollicular cells, chief cells of the stomach, ductal epithelium of the salivary gland, kidney proximal tubules, and minor cell types of the thymus, spleen, and colon. These results suggest that secretion from distinct cell types in various tissues involves either or both members of the CAPS family. (J Histochem Cytochem 55:301–311, 2007)

Key Words: CAPS2/CADPS2 • CAPS1/CADPS1 • secretion • exocytosis • immunohistochemistry


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