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- W2106451215 abstract "Although vgf gene knockout mice are hypermetabolic, administration of the VGF peptide TLQP-21 itself increased energy consumption. Agonist–antagonist roles are thus suggested for different VGF peptides, and the definition of their tissue heterogeneity is mandatory. We studied the rat stomach using antisera to C- or N-terminal sequences of known or predicted VGF peptides in immunohistochemistry and ELISA. TLQP (rat VGF 556 – 565 ) peptide/s were most abundant (162±11 pmol/g, mean± s.e.m. ) and were brightly immunostained in enterochromaffin-like (ECL) cells and somatostatin cells. A peptide co-eluting with TLQP-21 was revealed in HPLC of gastric and hypothalamic extracts, while the extended TLQP-62 form was restricted to the hypothalamus. Novel PGH (rat VGF 422 – 430 ) peptide/s were revealed in ghrelin cells, mostly corresponding to low MW forms (0.8–1.5 kDa), while VGF C-terminus peptides were confined to neurons. VGF mRNA was present in the above gastric endocrine cell types, and was prominent in chief cells, in parallel with low-intensity staining for further cleaved products from the C-terminal region of VGF (HVLL peptides: VGF 605 – 614 ). In swine stomach, a comparable profile of VGF peptides was revealed by immunohistochemistry. When fed and fasted rats were studied, a clear-cut, selective decrease on fasting was observed for TLQP peptides only (162±11 vs 74±5.3 pmol/g, fed versus fasted rats, mean± s.e.m. , P <0.00001). In conclusion, specific VGF peptides appear to be widely represented in different gastric endocrine and other mucosal cell populations. The selective modulation of TLQP peptides suggests their involvement in peripheral neuro-endocrine mechanisms related to feeding responses and/or ECL cell regulation." @default.
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- W2106451215 date "2010-09-27" @default.
- W2106451215 modified "2023-10-17" @default.
- W2106451215 title "Selective expression of TLQP-21 and other VGF peptides in gastric neuroendocrine cells and modulation by feeding" @default.
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- W2106451215 doi "https://doi.org/10.1677/joe-10-0189" @default.
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