Differential expression of the TFF-peptides xP1 and xP4 in the gastrointestinal tract of Xenopus laevis.
TFF-peptides (formerly P-domain peptides, trefoil factors) represent major secretory products of the mammalian gastrointestinal tract. A molecular cloning approach revealed the existence of two TFF-peptides, xP1 and xP4, also in the stomach of Xenopus laevis. Here, the localization of these two peptides by Western blot analysis as well as immunohistochemistry is presented. xP1 is found predominantly in the surface mucous cells of the stomach, whereas xP4 is mainly localized to a specific population of goblet cells in the esophagus, to mucous neck cells of the stomach, and to closely resembling cells in antral glands. xP4 in the esophagus and in the stomach differ by their N-glycosylation patterns. Compared to mammalian TFF-peptides, xP1 obviously represents the frog homologue of human TFF1 (formerly pS2) and xP4 seems to be the amphibian equivalent of human TFF2 (formerly hSP).
Jagla
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Institut für Molekularbiologie und Medizinische Chemie, Universitätsklinikum, Otto-von-Guericke-Universität, Leipziger Strasse 44, D-39120 Magdeburg, Germany.
Wiede
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A
Kölle
S
S
Hoffmann
W
W
D000818:Animals; D015153:Blotting, Western; D004064:Digestive System / Q000737:chemistry*; D004947:Esophagus / Q000737:chemistry; D005455:Fluorescent Antibody Technique; D006133:Growth Substances / Q000032:analysis* / Q000378:metabolism; D006801:Humans; D007422:Intestines / Q000737:chemistry; D009077:Mucins / Q000032:analysis; D009124:Muscle Proteins; D009479:Neuropeptides; D010446:Peptide Fragments / Q000032:analysis*; D010455:Peptides / Q000032:analysis* / Q000378:metabolism; D013270:Stomach / Q000737:chemistry; D000071164:Trefoil Factor-2; D000071165:Trefoil Factor-3; D014982:Xenopus laevis
D006133:Growth Substances; D009077:Mucins; D009124:Muscle Proteins; D009479:Neuropeptides; D010446:Peptide Fragments; D010455:Peptides; C000604007:TFF2 protein, human; C099037:TFF3 protein, rat; C000604008:Tff2 protein, rat; D000071164:Trefoil Factor-2; D000071165:Trefoil Factor-3