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Endocrinology Vol. 142, No. 5 1958-1967
Copyright © 2001 by The Endocrine Society

ARTICLES

Phenotypic Manifestations of Insulin-Like Growth Factor-Binding Protein-3 Overexpression in Transgenic Mice1

Tomislav Modric2, Josef V. Silha, Zengdun Shi, Yaoting Gui, Adisak Suwanichkul, Susan K. Durham, David R. Powell and Liam J. Murphy3

Departments of Internal Medicine (L.J.M.) and Physiology (T.M., J.V.S., Z.S., Y.G., L.J.M.), University of Manitoba, Winnipeg, Manitoba, Canada R3E 0W3; and Department of Pediatrics, Baylor College of Medicine (A.S., S.K.D., D.R.P.), Houston, Texas 77030

Address all correspondence and requests for reprints to: L. J. Murphy, M.B., Ph.D., Departments of Internal Medicine and Physiology, University of Manitoba, Winnipeg, Manitoba, Canada R3E 0W3. E-mail: ljmurph{at}cc.umanitoba.ca

In cell culture systems insulin-like growth factor (IGF)-binding protein-3 (IGFBP-3) can both enhance and inhibit IGF-I action. To investigate the biological role of IGFBP-3 in vivo, transgenic (Tg) mice that constitutively overexpress the human IGFBP-3 complementary DNA (cDNA) driven by the mouse phosphoglycerate kinase I (PGK) and the cytomegalovirus (CMV) promoters were examined. Serum levels of human IGFBP-3 in CMVBP-3 and PGKBP-3 Tg mice were 4.7 and 5.8 µg/ml, respectively and total IGFBP-3 was increased 4.9- and 7.7-fold compared with that in wild-type (Wt) mice. In PGKBP-3 Tg mice the levels of transgene expression were similar in all tissues. Although CMVBP-3 mice demonstrated similar levels of expression of the transgene as PGKBP-3 mice in most tissues, markedly elevated expression was apparent in the kidney and heart. The transgene-derived IGFBP-3 circulated as a 150-kDa ternary complex, and serum IGF-I levels were elevated 1.9- to 2.8-fold in Tg mice compared with Wt mice. A significant reduction in birth weight of approximately 10% and a modest reduction in litter size were apparent in both Tg strains. Early postnatal growth, as assessed by both body weight and length, was significantly reduced in Tg mice compared with Wt mice. This was more marked in PGKBP-3 than in CMVBP-3 mice, who demonstrated a propensity to adiposity after weaning. The relative organ weights of brain and kidney were reduced in both Tg strains, whereas liver size and epididymal fat were significantly increased in CMVBP-3, but not PGKBP-3, mice. Our data indicate that overexpression of IGFBP-3 is associated with modest intrauterine and postnatal growth retardation despite elevated circulating IGF-I levels.




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