Abstract
We analyzed the expression of high in normal-1 (HIN-1), a putative breast tumor suppressor gene, and uteroglobin related protein-1 (UGRP-1), a homologue of HIN-1, in adult and developing mouse tissues. Highest HIN-1 and UGRP-1 expression is detected in the lung, while lower level HIN-1 expression is also detected in the stomach, heart, small intestine, uterine and mammary glands. The expression of both genes was detected only at E17.5–18.5 and the HIN-1 messenger RNA was localized to the epithelia of the trachea, bronchi, and uterine glands. The expression of HIN-1 is up-regulated during retinoic acid induced differentiation of bronchial epithelial cells. We also identified two putative Drosophila HIN-1 homologues. The expression of HIN-1 is restricted to terminally differentiated airway epithelial cells in vivo and in vitro implicating HIN-1 in the acquisition or maintenance of terminally differentiated epithelial phenotype.
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