A major goal of moderm biology is to determine how cells organize into three-dimensional structures that give rise to organs. Organogenesis that involves the development of complex tubular structures such as the lung, kidney, and vascular tree present an especially challenging problem. The cellular interactions, genetic programs and signal transduction pathways that give rise to these structures during development may become disrupted during pathological situations such as cancer or vascular injury. Recently, branching morphogenesis of the Drosophila tracheal system has been shown to be regulated by a Drosophila homolog of the fibroblast growth factor (FGF) family called Branchless and its receptor Breathless, a receptor tyrosine kinase. In the Drosophila tracheal system, new branches sprout from the growing ends of these tracheal buds. An antagonist of FGF signaling called Sprouty (Spry) regulates this apical bias. In flies mutant for the Spry gene, excessive branching occurs. Three human Spry homologs have been identified in the expressed sequence tag database (dbEST) and have been designated hSpry 1, hSpry2 and hSpry3. hSpry2 encodes a 315-residue polypeptide that contains a cysteine-rich domain with 51 percent identity to Drosophila Spry. Data from this laboratory indicates that hSpry2 is expressed in human umbilical vein endothelial cells and that its expression is up regulated by stimulation with FGF or tumor-promoting phorbol esters. These results are consistent with data from Drosophila indicating that Branchless (FGF) induces Spry expression thus creating a feedback mechanism for control of FGF signaling. Since FGF is angiogenic in vivo, we hypothesize that Spry2 may play a role in branching morphogenesis of the vascular system and that the regulatory pathway between FGF and Spry may be disrupted during tumor angiogenesis or other pathological situations involving unregulated vessel formation. To address this hypothesis we propose the following specific aims: 1) To determine the function and site(s) of action of Spry polypeptides on the FGF and VEGF signal transduction pathways using in vitro and in vivo approaches; and 2) To determine whether Spry regulates FGF or VEGF-induced endothelial cell growth, migration and/or differentiation using in vitro and in vivo models. These studies are likely to provide novel insight into the role of Spry in regulating endothelial cell function and may suggest strategies for therapeutic intervention of vascular disease.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
1R01HL065301-01A1
Application #
6327038
Study Section
Pathology A Study Section (PTHA)
Program Officer
Goldman, Stephen
Project Start
2001-06-20
Project End
2005-05-31
Budget Start
2001-06-20
Budget End
2002-05-31
Support Year
1
Fiscal Year
2001
Total Cost
$290,400
Indirect Cost
Name
Maine Medical Center
Department
Type
DUNS #
City
Portland
State
ME
Country
United States
Zip Code
04102
Yang, Xuehui; Gong, Yan; He, Qing et al. (2018) Loss of Spry1 attenuates vascular smooth muscle proliferation by impairing mitogen-mediated changes in cell cycle regulatory circuits. J Cell Biochem 119:3267-3279
Caron, Jennifer M; Ames, Jacquelyn J; Contois, Liangru et al. (2016) Inhibition of Ovarian Tumor Growth by Targeting the HU177 Cryptic Collagen Epitope. Am J Pathol 186:1649-61
Ames, Jacquelyn J; Contois, Liangru; Caron, Jennifer M et al. (2016) Identification of an Endogenously Generated Cryptic Collagen Epitope (XL313) That May Selectively Regulate Angiogenesis by an Integrin Yes-associated Protein (YAP) Mechano-transduction Pathway. J Biol Chem 291:2731-50
Contois, Liangru W; Akalu, Abebe; Caron, Jennifer M et al. (2015) Inhibition of tumor-associated ?v?3 integrin regulates the angiogenic switch by enhancing expression of IGFBP-4 leading to reduced melanoma growth and angiogenesis in vivo. Angiogenesis 18:31-46
Yang, Xuehui; Gong, Yan; Tang, Yuefeng et al. (2013) Spry1 and Spry4 differentially regulate human aortic smooth muscle cell phenotype via Akt/FoxO/myocardin signaling. PLoS One 8:e58746
Gong, Yan; Yang, Xuehui; He, Qing et al. (2013) Sprouty4 regulates endothelial cell migration via modulating integrin *3 stability through c-Src. Angiogenesis 16:861-75
Contois, Liangru W; Nugent, Desiree P; Caron, Jennifer M et al. (2012) Insulin-like growth factor binding protein-4 differentially inhibits growth factor-induced angiogenesis. J Biol Chem 287:1779-89
Young, Kira; Conley, Barbara; Romero, Diana et al. (2012) BMP9 regulates endoglin-dependent chemokine responses in endothelial cells. Blood 120:4263-73
Tang, Yuefeng; Yang, Xuehui; Friesel, Robert E et al. (2011) Mechanisms of TGF-?-induced differentiation in human vascular smooth muscle cells. J Vasc Res 48:485-94
Yang, Xuehui; Gong, Yan; Friesel, Robert (2011) Spry1 is expressed in hemangioblasts and negatively regulates primitive hematopoiesis and endothelial cell function. PLoS One 6:e18374

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