TY - JOUR
T1 - Intestinal carbamoyl phosphate synthase I in human and rat
T2 - expression during development shows species differences and mosaic expression in duodenum of both species
AU - van Beers, Erik H.
AU - Rings, Edmond H.H.M.
AU - Posthuma, Georg
AU - Dingemanse, Maria A.
AU - Taminiau, Jan A.J.M.
AU - Heymans, Hugo S.A.
AU - Einerhand, Alexandra W.C.
AU - Buller, Hans A.
AU - Dekker, Jan
PY - 1998/2
Y1 - 1998/2
N2 - The clinical importance of carbamoyl phosphate synthase I (CPSI) relates to its capacity to metabolize ammonia, because CPSI deficiencies cause lethal serum ammonia levels. Although some metabolic parameters concerning liver and intestinal CPSI have been reported, the extent to which enterocytes contribute to ammonia conversion remains unclear without a detailed description of its developmental and spatial expression patterns. Therefore, we determined the patterns of enterocytic CPSI mRNA and protein expression in human and rat intestine during embryonic and postnatal development, using in situ hybridization and immunohistochemistry. CPSI protein appeared during human embryogenesis in liver at 31–35 e.d. (embryonic days) before intestine (59 e.d.), whereas in rat CPSI detection in intestine (at 16 e.d.) preceded liver (20 e.d.). During all stages of development there was a good correlation between the expression of CPSI protein and mRNA in the intestinal epithelium. Strikingly, duodenal enterocytes in both species exhibited mosaic CPSI protein expression despite uniform CPSI mRNA expression in the epithelium and the presence of functional mitochondria in all epithelial cells. Unlike rat, CPSI in human embryos was expressed in liver before intestine. Although CPSI was primarily regulated at the transcriptional level, CPSI protein appeared mosaic in the duodenum of both species, possibly due to post-transcriptional regulation.
AB - The clinical importance of carbamoyl phosphate synthase I (CPSI) relates to its capacity to metabolize ammonia, because CPSI deficiencies cause lethal serum ammonia levels. Although some metabolic parameters concerning liver and intestinal CPSI have been reported, the extent to which enterocytes contribute to ammonia conversion remains unclear without a detailed description of its developmental and spatial expression patterns. Therefore, we determined the patterns of enterocytic CPSI mRNA and protein expression in human and rat intestine during embryonic and postnatal development, using in situ hybridization and immunohistochemistry. CPSI protein appeared during human embryogenesis in liver at 31–35 e.d. (embryonic days) before intestine (59 e.d.), whereas in rat CPSI detection in intestine (at 16 e.d.) preceded liver (20 e.d.). During all stages of development there was a good correlation between the expression of CPSI protein and mRNA in the intestinal epithelium. Strikingly, duodenal enterocytes in both species exhibited mosaic CPSI protein expression despite uniform CPSI mRNA expression in the epithelium and the presence of functional mitochondria in all epithelial cells. Unlike rat, CPSI in human embryos was expressed in liver before intestine. Although CPSI was primarily regulated at the transcriptional level, CPSI protein appeared mosaic in the duodenum of both species, possibly due to post-transcriptional regulation.
UR - https://www.researchgate.net/publication/13783541_Intestinal_Carbamoyl_Phosphate_Synthase_I_in_Human_and_Rat_Expression_During_Development_Shows_Species_Differences_and_Mosaic_Expression_in_Duodenum_of_Both_Species
U2 - 10.1177/002215549804600212
DO - 10.1177/002215549804600212
M3 - Article
C2 - 9446830
SN - 0022-1554
VL - 46
SP - 231
EP - 240
JO - Journal of Histochemistry & Cytochemistry
JF - Journal of Histochemistry & Cytochemistry
IS - 2
ER -