Cholecystokinin immunoreactivity in the digestive tract of bowfin (Amia calva), bluegill (Lepomis macrochirus), and bullfrog (Rana catesbeiana)

Immunohistochemical localization of glucagon, substance‐P and vasoactive intestinal peptide in gastrointestinal tract mucosa of zander

“…VIP-immunoreactivity in the intestinal nerve fibres of myenteric plexus and ganglion cells and intestinal muscle layer has also been reported in S. stellaris (Cimini et al, 1989), G. morhua (Jensen et al, 1987), L. macrochirus and A. calva (Rajjo et al, 1988), Poecilia reticulata Peters and L. idus melanotus (Holm & Holmgren, 1989) and S. acanthias (Holmgren & Nilsson, 1983). The present findings of VIP-IR in some submucosal cells supports the observation of Cimini et al (1989) in S. stellaris.…”

Immunohistochemical localization of endocrine cells in the alimentary tracts of six frog species

“…In amphibian research, the cells were identified in the stomach as well as in the duodenum of R. catesbeiana (Rajjo et al, 1988) and CCK-8 were especially observed in the intestine of larvae of the R. temporaria (Bodegas et al, 1997). The presence of CCK-immunoreactivity in the digestive tracts is common among vertebrates, but toward the higher vertebrates it was detected in the stomach or proximal part of the intestine, which is related to the compact pancreas (Rajjo et al, 1988).…”

“…In amphibian research, the cells were identified in the stomach as well as in the duodenum of R. catesbeiana (Rajjo et al, 1988) and CCK-8 were especially observed in the intestine of larvae of the R. temporaria (Bodegas et al, 1997). The presence of CCK-immunoreactivity in the digestive tracts is common among vertebrates, but toward the higher vertebrates it was detected in the stomach or proximal part of the intestine, which is related to the compact pancreas (Rajjo et al, 1988). It can be considered that both gastrin and CCK-8 originated from the same ancestor since they show similar C-terminal structures, which were detected through immunoreactivity using the gastrin/CCK antiserum recognizing both gastrin and CCK-8 responded gastrin/CCK family (Larsson and Rehfeld, 1977).…”

“…To date, most research on amphibian enteroendocrine cells have elucidate the function of the ultrastructure of these cells. Several immunohistochemical studies also have been carried out for these cells, but limited to specific organs which provide researchers with fragmentary information (Rajjo et al, 1988;Valverde et al, 1993;Trandaburu and Nllrnberger, 1995;Bodegas et al, 1997). The present study aims to characterize these cells on the whole alimentary tracts of six frog species inhabiting Korea, some of which have never been studied for this purpose.…”

“…From lower vertebrates to mammals, various types of enteroendocrine cells are observed, with different ultrastructure and distribution between species (Holmgren et al, 1982;El-Salhy, 1984). Thus, immunohistochemical investigation on these cells is considered to be an important part of a phylogenic study Rajjo et al, 1988;Arena et al, 1990;Agungpiryono el al., 1994;D'Este et al, 1994).…”