TY - JOUR
T1 - Expression of Grb7 growth factor receptor signaling protein in kidney development and in adult kidney
AU - Leavey, Sean F.
AU - Arend, Lois J.
AU - Dare, Heidi
AU - Dressler, Gregory R.
AU - Briggs, Josie P.
AU - Margolis, Benjamin L.
PY - 1998/11
Y1 - 1998/11
N2 - Grb7, a signaling protein whose physiological function is unknown, binds receptor tyrosine kinases important for normal kidney development. By investigating and correlating Grb7 gene expression with that reported for Grb7-binding receptors, we provide clues to Grb7 function(s). RT-PCR and immunoblot were used to demonstrate Grb7 gene and protein expression in the mature kidney. Additional RT-PCR studies detected gene expression in all microdissected adult nephron segments examined, except glomeruli, and in the mouse metanephric kidney from embryonic day 11 (E11) through to day 17 (E17). In situ hybridization at E14 demonstrated the following cellular pattern of localization: Grb7 mRNA in metanephric epithelia of mesenchymal and ureteric bud origin; no expression in the undifferentiated mesenchyme; and little expression in podocyte-destined cells or primitive glomeruli. Grb7 mRNA was also present in the epithelia of the lung and gut at E14. Thus Grb7 may have a basic function in growth factor signaling in terminally differentiated epithelia along the nephron and in developing epithelia in the kidney, lung, and gut. It is localized in a pattern permissive for a role in Her2 and Ret receptor signaling.
AB - Grb7, a signaling protein whose physiological function is unknown, binds receptor tyrosine kinases important for normal kidney development. By investigating and correlating Grb7 gene expression with that reported for Grb7-binding receptors, we provide clues to Grb7 function(s). RT-PCR and immunoblot were used to demonstrate Grb7 gene and protein expression in the mature kidney. Additional RT-PCR studies detected gene expression in all microdissected adult nephron segments examined, except glomeruli, and in the mouse metanephric kidney from embryonic day 11 (E11) through to day 17 (E17). In situ hybridization at E14 demonstrated the following cellular pattern of localization: Grb7 mRNA in metanephric epithelia of mesenchymal and ureteric bud origin; no expression in the undifferentiated mesenchyme; and little expression in podocyte-destined cells or primitive glomeruli. Grb7 mRNA was also present in the epithelia of the lung and gut at E14. Thus Grb7 may have a basic function in growth factor signaling in terminally differentiated epithelia along the nephron and in developing epithelia in the kidney, lung, and gut. It is localized in a pattern permissive for a role in Her2 and Ret receptor signaling.
KW - Gene expression
KW - Grb7
KW - In situ hybridization
KW - Receptor tyrosine kinase
KW - Reverse transcription- polymerase chain reaction
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U2 - 10.1152/ajprenal.1998.275.5.f770
DO - 10.1152/ajprenal.1998.275.5.f770
M3 - Article
C2 - 9815134
AN - SCOPUS:0031761128
SN - 0363-6127
VL - 275
SP - F770-F776
JO - American Journal of Physiology - Renal Physiology
JF - American Journal of Physiology - Renal Physiology
IS - 5 44-5
ER -