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(American Journal of Pathology. 1999;154:1601-1610.)
© 1999 American Society for Investigative Pathology

Regular Articles

HIP/PAP Gene, Encoding a C-Type Lectin Overexpressed in Primary Liver Cancer, Is Expressed in Nervous System as well as in Intestine and Pancreas of the Postimplantation Mouse Embryo

Chantal Lasserre*, Céline Colnot{dagger}, Christian Bréchot* and Françoise Poirier{dagger}

From the Unité INSERM 370,*
CHU Necker and INSERM U 257,{dagger}
Institut Cochin de Génétique Moléculaire, Paris, France

We originally isolated the HIP/PAP gene in a differential screen of a human hepatocellular carcinoma cDNA library. This gene is expressed at high levels in 25% of primary liver cancers but not in nontumorous liver. HIP/PAP belongs to the family of C-type lectins and acts as an adhesion molecule for hepatocytes. In normal adult human tissues, HIP/PAP expression is found in pancreas (exocrine and endocrine cells) and small intestine (Paneth and neuroendocrine cells). In order to gain insight into the possible role of HIP/PAP in vivo, we have investigated the pattern of HIP/PAP expression in the developing postimplantation mouse embryo by in situ hybridization. Detailed analysis of developing mouse embryos revealed that HIP/PAP gene exhibits a restricted expression pattern during development. Thus, HIP/PAP transcripts are first observed within the nervous system from day 14.5 onwards in trigeminal ganglia, dorsal root ganglia, and spinal cord where it appears to be an early specific marker of a subpopulation of motor neurons. At laster stages, HIP/PAP transcripts were detected in intestine and pancreas at day 16.5 but not in embryonic liver. This highly restricted expression pattern suggests that HIP/PAP might participate in neuronal as well as intestinal and pancreatic cell development.




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M.-T. SIMON, A. PAULOIN, G. NORMAND, H.-T. LIEU, H. MOULY, G. PIVERT, F. CARNOT, J. G. TRALHAO, C. BRECHOT, and L. CHRISTA
HIP/PAP stimulates liver regeneration after partial hepatectomy and combines mitogenic and anti-apoptotic functions through the PKA signaling pathway
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[Abstract] [Full Text] [PDF]


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Copyright © 1999 by the American Society for Investigative Pathology.