Interaction of Escherichia coli heat-stable enterotoxin (STa) with its putative receptor on the intestinal tract of newborn kids.
The elaboration of heat stable enterotoxin (STa) is an important step in the pathogenesis of enterotoxigenic Escherichia coli (ETEC), which causes severe diarrhea in newborn animals. In this study, the distribution of the STa-specific receptors on enterocytes and brush border membrane vesicles (BBMVs) prepared from the anterior jejunum, posterior jejunum, ileum and colon of newborn kids was investigated. The density of STa-receptors on enterocytes and BBMVs was higher in the posterior jejunum than that in other segments of the kids' intestines. Additionally, the affinity of the posterior jejunum STa-receptors was higher than the affinity of receptors present on the epithelium of other intestinal segments. Our findings suggest that the posterior jejunum is a major target for STa within the intestinal tract of newborn kids.
Al-Majali
Ahmad M
AM
Department of Veterinary Clinical Sciences, Faculty of Veterinary Medicine, Jordan University of Science and Technology, Irbid, Jordan. almajali@just.edu.jo
Ababneh
Mohammed M
MM
Shorman
M
M
Saeed
A Mahdi
AM
D000818:Animals; D000831:Animals, Newborn; D001427:Bacterial Toxins / Q000378:metabolism*; D020895:Enterocytes / Q000166:cytology / Q000378:metabolism; D004768:Enterotoxins / Q000378:metabolism*; D004926:Escherichia coli / Q000378:metabolism*; D029968:Escherichia coli Proteins; D005434:Flow Cytometry / Q000379:methods; D006041:Goats / Q000378:metabolism*; D006162:Guanylate Cyclase / Q000378:metabolism*; D007413:Intestinal Mucosa / Q000378:metabolism*; D007457:Iodine Radioisotopes; D008297:Male; D008871:Microvilli / Q000378:metabolism; D000074261:Receptors, Enterotoxin; D050705:Receptors, Guanylate Cyclase-Coupled; D018000:Receptors, Peptide / Q000378:metabolism*
D001427:Bacterial Toxins; D004768:Enterotoxins; D029968:Escherichia coli Proteins; D007457:Iodine Radioisotopes; D018000:Receptors, Peptide; C034151:heat stable toxin (E coli); D006162:Guanylate Cyclase; D000074261:Receptors, Enterotoxin; D050705:Receptors, Guanylate Cyclase-Coupled