The TGF-ss superfamily is the largest group of secreted signaling molecules found in man. They regulate a very large number of cellular, developmental and physiological processes including early axial development, germ layer specification, gastrulation, organogenesis, and left right asymmetry. We will use a well-studied model organism (Drosophila) to elucidate general principles by which the activities of TGF-ss signaling pathways are regulated during development.
In Aim 1 we will examine mechanisms by which three new gene products control Dpp signaling in the early embryo. These experiments will significantly improve our understanding of how extracellular factors, affect signaling dynamics of TGF-ss factors in vivo.
In Aim 2 we will determine the functional significance and mechanism of TGF-ss type II receptor basolateral localization in epithelial cells using a combination of Drosophila molecular genetics and proteomics in MDCK cells. These experiments will considerably enhance our understanding of how receptors in this major signaling pathway are delivered to different sub-compartments of the cell membrane and how this affects tissue development.
In Aim 3 we will use molecular genetics methods, to determine how one sub-family (Activins) influences the signaling output of another subfamily (BMPs) to control tissue growth. This work will determine whether cross TGF-ss- pathway signaling or non-canonical signaling contributes to growth regulation, an important issue in the development of many tissues and disease processes. Impact on human health: In humans, genetic and somatic mutations that alter the expression or regulation of TGF-ss factors are major contributors to numerous disease processes including cancer, metastasis, fibrosis, immune regulation, cardiovascular disease, and connective tissue disorders. Therefore, there is currently much effort within the medical community to develop therapeutic intervention strategies aimed at manipulating the activities of this pathway during treatment of various disease or injury situations. Our studies aimed at understanding how the activity of these factors is regulated in time and space in a model organism should aid in the identification of new therapeutic targets and/or development or more effective treatment protocols.

Public Health Relevance

The studies described here will help identify basic molecular processes that regulate TGF-ss signaling in a model organism. Since misregulation of TGF-ss signaling plays a major role in human pathologies including cancer, fibrosis, cardiovascular disease, and connective tissue disorders, this work will provide a paradigm for understanding molecular mechanisms that are responsible for major health problems in our society and will facilitate development of new therapeutic strategies.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM095746-04
Application #
8668073
Study Section
Development - 2 Study Section (DEV2)
Program Officer
Gaillard, Shawn R
Project Start
2011-08-08
Project End
2015-05-31
Budget Start
2014-06-01
Budget End
2015-05-31
Support Year
4
Fiscal Year
2014
Total Cost
$321,413
Indirect Cost
$106,486
Name
University of Minnesota Twin Cities
Department
Genetics
Type
Schools of Medicine
DUNS #
555917996
City
Minneapolis
State
MN
Country
United States
Zip Code
55455
Song, Wei; Cheng, Daojun; Hong, Shangyu et al. (2017) Midgut-Derived Activin Regulates Glucagon-like Action in the Fat Body and Glycemic Control. Cell Metab 25:386-399
McBrayer, Zofeyah L; Dimova, Jiva; Pisansky, Marc T et al. (2015) Forebrain-Specific Loss of BMPRII in Mice Reduces Anxiety and Increases Object Exploration. PLoS One 10:e0139860
Van Bortle, Kevin; Peterson, Aidan J; Takenaka, Naomi et al. (2015) CTCF-dependent co-localization of canonical Smad signaling factors at architectural protein binding sites in D. melanogaster. Cell Cycle 14:2677-87
Ghosh, Arpan C; Shimell, MaryJane; Leof, Emma R et al. (2015) UPRT, a suicide-gene therapy candidate in higher eukaryotes, is required for Drosophila larval growth and normal adult lifespan. Sci Rep 5:13176
Peterson, Aidan J; O'Connor, Michael B (2014) Strategies for exploring TGF-? signaling in Drosophila. Methods 68:183-93
Ghosh, Arpan C; O'Connor, Michael B (2014) Systemic Activin signaling independently regulates sugar homeostasis, cellular metabolism, and pH balance in Drosophila melanogaster. Proc Natl Acad Sci U S A 111:5729-34
Kim, Myung-Jun; O'Connor, Michael B (2014) Anterograde Activin signaling regulates postsynaptic membrane potential and GluRIIA/B abundance at the Drosophila neuromuscular junction. PLoS One 9:e107443
Ting, Chun-Yuan; McQueen, Philip G; Pandya, Nishith et al. (2014) Photoreceptor-derived activin promotes dendritic termination and restricts the receptive fields of first-order interneurons in Drosophila. Neuron 81:830-846
Peterson, Aidan J; O'Connor, Michael B (2013) Activin receptor inhibition by Smad2 regulates Drosophila wing disc patterning through BMP-response elements. Development 140:649-59
Peterson, Aidan J; O'Connor, Michael B (2012) You're going to need a bigger (glass bottom) boat. Sci Signal 5:pe14

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