Insulin-like growth factor-1 enhances epidermal growth factor receptor activation and renal tubular cell regeneration in postischemic acute renal failure

J Lab Clin Med. 1995 Jun;125(6):724-33.


Growth factors such as insulin-like growth factor-1 (IGF-1), epidermal growth factor (EGF), and hepatocyte growth factor have been shown to accelerate the recovery from postischemic acute renal failure (ARF) with a concomitant increase in DNA synthesis. Interactions between growth factors have been demonstrated in a number of in vitro studies. This study examined the effect of exogenous IGF-1 on the DNA synthesis and EGF receptor (EGF-R) activation in postischemic rat kidneys. Thirty minutes after the relief of 30-minute total occlusion of the left renal artery in anesthetized 225 to 300 gm Sprague-Dawley rats, either IGF-1 (75 micrograms/kg) or normal saline solution (NS, 0.2 ml) was given by intravenous bolus, followed by twice daily subcutaneous injections of IGF-1 (50 micrograms/kg) or 0.2 ml NS for 4 days, respectively, in IGF-1-Tx) and NS treated (NS-Tx) groups (n = 8 each). On the day after the completion of treatment, inulin clearance (ml/kg/min) of the postischemic kidneys in the IGF-1-Tx group was significantly higher (p < 0.01) than inulin clearance of kidneys in the NS-Tx group. This was associated with improved kidney morphology. IGF-1 treatment also enhanced the labeling index of 5-bromo-2'-deoxyuridine (percent of stained tubule cells), a marker for active DNA synthesis, in the outer medulla of postischemic kidneys at 1 day and 2 days after the injury. EGF-R tyrosine phosphorylation (which reflects receptor activation) increased in postischemic kidneys in both NS-Tx (n = 5) and IGF-1-Tx (n = 3) groups 1 day after the injury as compared with nonischemic contralateral kidneys. In the IGF-1-Tx group there was also increased iodine 125-labeled EGF binding and EGF-R protein. Our results demonstrate a beneficial effect of IGF-1 on postischemic ARF. Furthermore, they suggest that EGF-R activation is involved in tubular regeneration and that IGF-1 may enhance EGF-R activation by increasing EGF-R expression.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acute Kidney Injury / pathology
  • Acute Kidney Injury / physiopathology*
  • Acute Kidney Injury / therapy*
  • Analysis of Variance
  • Animals
  • Blood Pressure / drug effects
  • Body Weight / drug effects
  • DNA / biosynthesis
  • DNA / drug effects
  • Epidermal Growth Factor / metabolism
  • ErbB Receptors / drug effects
  • ErbB Receptors / metabolism*
  • Insulin-Like Growth Factor I / pharmacology*
  • Iodine Radioisotopes
  • Ischemia / physiopathology*
  • Kidney Medulla / drug effects
  • Kidney Medulla / pathology
  • Kidney Medulla / physiopathology
  • Kidney Tubules / drug effects
  • Kidney Tubules / pathology
  • Kidney Tubules / physiopathology*
  • Male
  • Phosphotyrosine
  • Rats
  • Rats, Sprague-Dawley
  • Regeneration / drug effects*
  • Renal Circulation
  • Tyrosine / analogs & derivatives
  • Tyrosine / analysis


  • Iodine Radioisotopes
  • Phosphotyrosine
  • Tyrosine
  • Epidermal Growth Factor
  • Insulin-Like Growth Factor I
  • DNA
  • ErbB Receptors