The role of the inositol polyphosphate 4-phosphatase in cellular signalling

Funding Activity

Website
http://purl.org/au-research/grants/nhmrc/334083

Funding Status
Closed

Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the .

Funded Activity Summary

Cells respond to hormones, stress, growth factors and other environmental stimuli resulting in secretion, cell growth, cell division and other specialized functions. These cellular responses are dependent on the generation of intracellular signals that send messages either to the nucleus, the cytoskeleton or membrane compartments and thereby elicit a specific response. A specific subset of signalling molecules that are localized on membrane compartments are called phosphoinositides. We plan to investigate the role of a specific lipid called PtdIns(3,4)P2 that recruits signalling proteins to specific cellular membranes including the inner wall of the plasma membrane and vesicles found within the cell. We have identified and are currently characterizing a novel enzyme called the inositol polyphosphate 4-phosphatase that terminates the signals generated by PtdIns(3,4)P2. We are characterizing mice which lack this enzyme. 4-phosphatase deficient mice demonstrate significant abnormalities in the brain and bone marrow. These mice appear unable to make circulating platelets, small anucleate cells which are vital in preventing bleeding. We will determine how the 4-phosphatase functions in regulating platelet production, by examining the bone marrow and blood of these mice. These studies are significant as platelet production is essential for prevention of blood loss following trauma and also is of vital importance in conditions associated with blood clotting including heart attack and stroke. Secondly we have identified a related enzyme to the 4-phosphatase designated P-Rex-1 which is highly expressed in brain and nerve cells. This proposal aims to determine if P-Rex-1 promotes nerve development.

Funded Activity Details

Start Date: 01-01-2005

End Date: 01-01-2007

Funding Scheme: NHMRC Project Grants

Funding Amount: $454,500.00

Funder: National Health and Medical Research Council

Research Topics

ANZSRC Field of Research (FoR)

ANZSRC Socio-Economic Objective (SEO)

There are no SEO codes available for this funding activity

Other Keywords

differentiation | hematology | infection | intracellular signalling | lipids | megakaryocytic proliferation | nerve development | phosphatase | phosphoinositide 3-kinase | platelet production

Related Links