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GDNF and MAPK–ERK pathway signaling is reduced during nephrogenesis following maternal under-nutrition

Published online by Cambridge University Press:  09 December 2009

T. Q. Henry ,
R. Z. Mansano ,
C. C. Nast ,
J. Lakshmanan ,
M. Abdallah ,
A. K. Abdel-Hakeem ,
M. Desai ,
M. G. Ross  and
T. R. Magee
T. Q. Henry
Affiliation:
Department of Obstetrics and Gynecology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, and Los Angeles Biomedical Research Institute, Harbor–UCLA Medical Center, Torrance, CA, USA
R. Z. Mansano
Affiliation:
Department of Obstetrics and Gynecology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, and Los Angeles Biomedical Research Institute, Harbor–UCLA Medical Center, Torrance, CA, USA
C. C. Nast
Affiliation:
Department of Pathology, Cedars-Sinai Medical Center, Los Angeles, CA, USA
J. Lakshmanan
Affiliation:
Department of Obstetrics and Gynecology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, and Los Angeles Biomedical Research Institute, Harbor–UCLA Medical Center, Torrance, CA, USA
M. Abdallah
Affiliation:
Department of Obstetrics and Gynecology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, and Los Angeles Biomedical Research Institute, Harbor–UCLA Medical Center, Torrance, CA, USA
A. K. Abdel-Hakeem
Affiliation:
Department of Obstetrics and Gynecology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, and Los Angeles Biomedical Research Institute, Harbor–UCLA Medical Center, Torrance, CA, USA
M. Desai
Affiliation:
Department of Obstetrics and Gynecology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, and Los Angeles Biomedical Research Institute, Harbor–UCLA Medical Center, Torrance, CA, USA
M. G. Ross
Affiliation:
Department of Obstetrics and Gynecology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, and Los Angeles Biomedical Research Institute, Harbor–UCLA Medical Center, Torrance, CA, USA
T. R. Magee*
Affiliation:
Department of Obstetrics and Gynecology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, and Los Angeles Biomedical Research Institute, Harbor–UCLA Medical Center, Torrance, CA, USA
*
Address for correspondence: T. R. Magee, Assistant Professor, 1124 W. Carson St Building RB1, RM 215, Torrance, CA 90502, USA. (Emails [email protected], [email protected])
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Abstract

Maternal under-nutrition (MUN) during gestation results in growth-restricted newborns with reduced glomerular number and subsequent hypertension. We investigated dysregulation of glial derived neurotrophic factor (GDNF) and MAPK–ERK (mitogen-activated protein kinase–extracellular signal-regulated protein kinase) signal pathway gene expression following MUN. MUN rats were 50% food restricted from embryonic day 10 till postnatal day 1. Kidneys were harvested at embryonic day (E)20, and postnatal days (P)1 and 21. Kidney protein expression was determined by Western blot. At E20, protein expression of growth factor receptor alpha 1 (GFRα1) and phosphorylated ERK1/2 and mitogen-activated protein kinase kinase (MEK)1/2 were reduced significantly, and immunohistochemistry confirmed reduction of phosphorylated ERK (pERK) with maintenance of pERK localization. Total MEK and ERK were unchanged. At P1, only GFRα1 and pERK1/2 were reduced significantly while at P21, expression of all growth factors except total MEK was unchanged. Total MEK was increased. Glomerular number was decreased by 19% in P21 kidneys and blood pressure was increased in 12-week-old rats. In conclusion, GDNF and MAPK–ERK signaling are dysregulated during active nephrogenesis in fetal and early newborn offspring kidneys in the MUN model. This may be a key mechanism in reduced offspring nephrogenesis and programmed hypertension.

Keywords

ERK signaling, gestational programming, maternal under-nutrition, nephrogenesis, nephropenia
Type
Original Article
Information
Journal of Developmental Origins of Health and Disease , Volume 1 , Issue 1 , February 2010 , pp. 67 - 74
Copyright
Copyright © Cambridge University Press and the International Society for Developmental Origins of Health and Disease 2009

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