Transplantation of insulin-like growth factor-II-secreting tumors into nude rodents.
Restricted supplies of insulin-like growth factor II (IGF-II) have severely limited investigation of the in vivo actions of this hormone. To circumvent this problem, we have developed an in vivo rodent model in which rat (r) IGF-II-secreting cells (18, 54-SF) are transplanted into congenitally immunodeficient (nude) rats and mice. These cells proliferate and form discrete tumors that contain rIGF-II and abundant IGF-II receptors. The tumors also secrete rIGF-II into the circulation, resulting in plasma rIGF-II concentrations many-fold greater than those in control rodents (81 +/- 19 vs. less than 10 ng/ml, rats; 159 +/- 28 vs. 18 +/- 5 ng/ml, mice; P less than 0.05, both groups). There was no significant difference between the tumor-bearing and control rodents in either body weight or tail length. The tumor-bearing rodents did have significantly lower concentrations of IGF-I (296 +/- 23 vs. 527 +/- 67 ng/ml, rats; 300 +/- 26 vs. 482 +/- 70 ng/ml, mice; P less than 0.05, both groups), suggesting that the increased concentrations of rIGF-II may have inhibited IGF-I production or secretion. This animal model may be used to explore the biological effects of increased plasma IGF-II concentrations.
D000236:Adenoma / Q000378:metabolism* / Q000473:pathology; D000818:Animals; D002460:Cell Line; D002845:Chromatography; D004591:Electrophoresis, Polyacrylamide Gel; D007335:Insulin-Like Growth Factor II / Q000097:blood / Q000378:metabolism*; D051379:Mice; D008819:Mice, Nude; D009368:Neoplasm Transplantation; D010911:Pituitary Neoplasms / Q000378:metabolism* / Q000473:pathology; D011869:Radioligand Assay; D051381:Rats; D011923:Rats, Nude; D013002:Somatomedins / Q000378:metabolism*
D013002:Somatomedins; D007335:Insulin-Like Growth Factor II