Comp Biochem Physiol B Biochem Mol Biol 2005 Mar 01;1403:505-11. doi: 10.1016/j.cbpc.2004.11.015.

Expression of CCAAT/enhancer binding protein delta is closely associated with degeneration of surface mucous cells of larval stomach during the metamorphosis of Xenopus laevis.

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CCAAT/enhancer binding protein delta (C/EBP delta) is one of the transcription factors that have a basic-leucine zipper domain. In mammals, it has been suggested that this transcription factor plays a role in differentiation of adipocytes or in apoptosis of mammary gland epithelial cells. The factor also plays a role in acute-phase response in injury, infection and inflammation. We cloned Xenopus homologues of the C/EBP delta gene from metamorphosing stomach by subtractive hybridization and analyzed spatio-temporal expression pattern of the homologues. Two isoforms of C/EBP delta were isolated and named C/EBP delta-1 and -2. Their deduced amino acid sequences were highly similar to each other (identity, 91.2%). Expression of the C/EBP delta mRNAs in the stomach transiently increased during its metamorphosis-associated remodeling, and the transient up-regulation was also found in thyroid hormone-induced metamorphosis. The C/EBP delta mRNAs were exclusively localized in degenerating larval surface mucous cells, not in newly proliferating and differentiating adult-type epithelial cells. The result suggests a possibility that Xenopus C/EBP delta plays a role in apoptotic cell death of larval-type epithelium during the stomach remodeling.

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Species referenced: Xenopus laevis
Genes referenced: cebpa cebpd dll1