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Section on Cellular and Molecular Physiology (J.L.L., M.K.,
D.L.) Diabetes Branch and Laboratory of Biochemistry and
Metabolism (B.S.) The National Institute of Diabetes and
Digestive and Kidney Diseases
Laboratory of Mammalian
Genes and Development (A.G., H.W.) and Developmental Endocrinology
Branch (D.A.) The National Institute of Child Health and Human
Development National Institutes of Health Bethesda, Maryland
20892
Insulin-like growth factor-I (IGF-I) is essential for cell growth, differentiation and postnatal development. A null mutation in igf-1 causes intrauterine growth retardation and perinatal lethality. The present study was designed to test the lower limit of igf-1 gene dosage that ensures survival and postnatal growth by using the Cre/loxP system. Mice with variable reductions in IGF-I levels were generated by crossing EIIa-cre transgenic mice and mice with loxP-flanked igf-1 locus (igf-1/flox). EIIa-cre mice express bacteriophage P1 Cre (causes recombination) recombinase under the adenovirus promoter EIIa, during early embryonic development before implantation, and cause genomic recombination of the igf-1/flox locus. Mice with the most extensive recombination die immediately after birth, while the survivors have significant growth retardation in proportion to the reduction in their igf-1 gene. Interestingly, this gene dosage effect on body weight was not very significant before weaning. However, when the young animals were weaned at 3 weeks, the igf-1 gene dosage was the only independent predictor of the weight gain between 3 and 6 weeks among the parameters tested. Although growth retarded, mice with Cre-induced partial igf-1 deficiency were fertile and gave birth to null mice. Thus Cre-induced genomic recombination using the EIIa promoter occurs during development and creates distinct phenotypes compared with the conventional null mutation. This variability allows for postnatal survival and will enable one to begin to explore the role of the endocrine vs. paracrine effects of IGF-I.
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A. A. Butler and D. LeRoith Minireview: Tissue-Specific Versus Generalized Gene Targeting of the igf1 and igf1r Genes and Their Roles in Insulin-Like Growth Factor Physiology Endocrinology, May 1, 2001; 142(5): 1685 - 1688. [Abstract] [Full Text] |
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M. Holzenberger, C. Lenzner, P. Leneuve, R. Zaoui, G. Hamard, S. Vaulont, and Y. L. Bouc Cre-mediated germline mosaicism: a method allowing rapid generation of several alleles of a target gene Nucleic Acids Res., November 1, 2000; 28(21): e92 - e92. [Abstract] [Full Text] [PDF] |
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J.-L. Liu, S. Yakar, and D. LeRoith Conditional Knockout of Mouse Insulin-Like Growth Factor-1 Gene Using the Cre/loxP System Experimental Biology and Medicine, April 1, 2000; 223(4): 344 - 351. [Abstract] [Full Text] [PDF] |
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Y. R. Boisclair, J. Wang, J. Shi, K. R. Hurst, and G. T. Ooi Role of the Suppressor of Cytokine Signaling-3 in Mediating the Inhibitory Effects of Interleukin-1beta on the Growth Hormone-dependent Transcription of the Acid-labile Subunit Gene in Liver Cells J. Biol. Chem., February 11, 2000; 275(6): 3841 - 3847. [Abstract] [Full Text] [PDF] |
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J.-L. Liu and D. LeRoith Insulin-Like Growth Factor I Is Essential for Postnatal Growth in Response to Growth Hormone Endocrinology, November 1, 1999; 140(11): 5178 - 5184. [Abstract] [Full Text] |
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S. Yakar, J.-L. Liu, B. Stannard, A. Butler, D. Accili, B. Sauer, and D. LeRoith Normal growth and development in the absence of hepatic insulin-like growth factor I PNAS, June 22, 1999; 96(13): 7324 - 7329. [Abstract] [Full Text] [PDF] |
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K. Sjogren, J.-L. Liu, K. Blad, S. Skrtic, O. Vidal, V. Wallenius, D. LeRoith, J. Tornell, O. G. P. Isaksson, J.-O. Jansson, et al. Liver-derived insulin-like growth factor I (IGF-I) is the principal source of IGF-I in blood but is not required for postnatal body growth in mice PNAS, June 8, 1999; 96(12): 7088 - 7092. [Abstract] [Full Text] [PDF] |
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H. Zhang, H. Hoff, and C. Sell Insulin-like Growth Factor I-mediated Degradation of Insulin Receptor Substrate-1 Is Inhibited by Epidermal Growth Factor in Prostate Epithelial Cells J. Biol. Chem., July 14, 2000; 275(29): 22558 - 22562. [Abstract] [Full Text] [PDF] |
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A. Hellstrom, C. Perruzzi, M. Ju, E. Engstrom, A.-L. Hard, J.-L. Liu, K. Albertsson-Wikland, B. Carlsson, A. Niklasson, L. Sjodell, et al. Low IGF-I suppresses VEGF-survival signaling in retinal endothelial cells: Direct correlation with clinical retinopathy of prematurity PNAS, May 8, 2001; 98(10): 5804 - 5808. [Abstract] [Full Text] [PDF] |
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D. S. Sohal, M. Nghiem, M. A. Crackower, S. A. Witt, T. R. Kimball, K. M. Tymitz, J. M. Penninger, and J. D. Molkentin Temporally Regulated and Tissue-Specific Gene Manipulations in the Adult and Embryonic Heart Using a Tamoxifen-Inducible Cre Protein Circ. Res., July 6, 2001; 89(1): 20 - 25. [Abstract] [Full Text] [PDF] |
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