PhD Proposal by Jiexi Liao

Jiexi Liao

BME PhD Proposal

 

December 14, 2017, 9-11 AM

McIntire Conference Room (3115), Whitaker Building

 

Committee:

Advisor: Cheng Zhu, PhD

Georgia Institute of Technology, Department of Biomedical Engineering

Shuichi Takayama, PhD

Georgia Institute of Technology, Department of Biomedical Engineering

Manu O. Platt, PhD

Georgia Institute of Technology, Department of Biomedical Engineering

Brian G. Petrich, PhD

Emory University, Department of Pediatrics

Shaun P. Jackson, PhD

University of Sydney, Heart Research Institute

 

Title:

Mechanically regulated hyper-reactivity of platelets in diabetes: a close look at binding-signaling-binding

 

Abstract:

Diabetes affects 422 million people globally and the prevalence is growing. Cardiovascular complications from atherothrombosis are the primary cause of diabetes-related death largely due to the exaggerated thrombotic response. Diabetic patients are typically less responsive to conventional anti-coagulant and anti-platelet therapies that target the biochemical pathways of thrombosis, which further increases the risk of morbidity and mortality. Evidence suggests that biomechanical pathways of platelets are markedly dysregulated in diabetes. This proposal aims to identify and characterize key players in the platelet mechanotransduction loop (binding-signaling-binding) and how their functional balance might be tipped in diabetes. Mechanosensors, such as GPIb and integrin GPIIbIIIa on platelets, can upregulate secondary messengers when binding to ligand under shear; the secondary messengers may initiate signaling cascade that would induce talin, a cytoplasmic adaptor protein, to link cytoskeleton to and activate integrins, resulting in platelet activation. The working hypotheses are 1) diabetic platelets, through GPIIbIIIa mechanosensing, are more reactive to increasing mechanical stimuli, and 2) the shear modulation of cGMP, a generally anti-thrombotic secondary messenger, is dysfunctional in diabetes, and 3) platelet talin is dysregulated in diabetes; disruption of interactions between the talin head and integrin GPIIbIIIa tail that are crucial for platelet adhesion and aggregation could eliminate the phenotype of diabetic platelets.

Event Details

Date/Time:

  • Thursday, December 14, 2017
    9:00 am - 11:00 am
Location: McIntire Conference Room (3115), Whitaker Building