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Function and Mechanism of the Intercalated Disc Protein XinB in Cardiomyocyte Proliferation and Cardiac Regeneration

Award Number: R01HL168900
ORGANIZATION: NATIONAL HEART, LUNG, & BLOOD INSTITUTE
OPDIV: NIH
AWARD CLASS: DISCRETIONARY
AWARD ACTIVITY TYPE: SCIENTIFIC/HEALTH RESEARCH (INCLUDES SURVEYS)
PERIOD OF PERFORMANCE START DATE: 04/01/2023
PERIOD OF PERFORMANCE END DATE: 03/31/2027

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Function and Mechanism of the Intercalated Disc Protein XinB in Cardiomyocyte Proliferation and Cardiac Regeneration - ABSTRACT Cardiovascular diseases remain the leading cause of death in humans, yet the molecular mechanisms underlying these devastating conditions have not been fully elucidated. Cardiac disease is especially common in the elderly, and as the global population ages their elevated incidence will pose a serious healthcare challenge. An important structure in heart muscle cells is the intercalated disc (ICD), which mediates the coordination of the cardiac syncytium. It functions by connecting neighboring cardiomyocytes, thereby maintaining the functional integrity of this syncytium; this is crucial to the proper contraction of the heart. Although many reports demonstrate the importance of ICDs in the organization of the myocardium, relatively little is known about how these cell-to-cell junctions transmit information between cardiac muscle cells to modulate gene expression and cardiac function. The Xin-repeat containing adaptor proteins Xinα and Xinβ, also called XIRP1 and XIRP2 respectively, were first discovered by the PI. These two proteins are located in the ICD of adult cardiomyocytes and interact with various adherens junction proteins including N-cadherin and β-catenin, supporting an essential role for them in the formation/maintenance of this structure. They also play important roles during early cardiac development and in the pathogenesis of heart disease. However, the role of the Xin proteins remains poorly studied and their specific cellular and molecular functions are largely unknown. Our recent studies of the hearts of Xin knock-out (KO) mice have identified defects in development associated with impaired cardiomyocyte proliferation. Our studies further demonstrated a physical and genetic interaction between Xin and NF2, a component of the important Hippo/YAP pathway. The Hippo-YAP pathway is a highly conserved cellular regulatory network that has been previously implicated in multiple developmental systems and disease, including the heart; however, the mechanisms of its action remain unclear and a link to the ICD is a novel and exciting new discovery. Therefore, we have designed two integrative Specific Aims to test the mechanism by which the ICD protein Xin mediates cardiomyocyte proliferation, maturation, and regeneration. For the first Aim, we will investigate the interaction between Xin and the Hippo/YAP pathway. We will study how Xin regulates YAP activity and how the interaction between Xin and Hippo-YAP signaling regulates cardiac function and regeneration. For the second Aim, we will study how YAP/Tead1 regulates Xin transcription and test our hypothesis that Xin-YAP cross-regulation is crucial to cardiac gene expression and heart regeneration. The studies proposed here will reveal novel molecular mechanisms by which the important pathophysiological Hippo/YAP signal is modulated by the ICD protein Xin in the heart. The molecules defined in this study will become targets for therapeutic intervention in the treatment of cardiac diseases.


Issue Date FY	Funding FY	Legal Entity Name	Legal Entity Address	Legal Entity City	Legal Entity State	Legal Entity Zip Code	Legal Entity COUNTY	Legal Entity COUNTRY	Assistance Listing	Award Code	Budget Year	Action Date	Action Type	Action Amount

Issue Date FY: 2026 ( Subtotal = $535,851 )
2026	2026	UNIVERSITY OF SOUTH FLORIDA	4202 E FOWLER AVE	TAMPA	FL	33620	HILLSBOROUGH	USA	Cardiovascular Diseases Research	000	4	3/9/2026	NON-COMPETING CONTINUATION	$535,851
														Subtotal = $535,851

Issue Date FY: 2025 ( Subtotal = $564,053 )
2025	2025	UNIVERSITY OF SOUTH FLORIDA	4202 E FOWLER AVE	TAMPA	FL	33620	HILLSBOROUGH	USA	Cardiovascular Diseases Research	000	3	4/9/2025	NON-COMPETING CONTINUATION	$507,647
2025	2025	UNIVERSITY OF SOUTH FLORIDA	4202 E FOWLER AVE	TAMPA	FL	33620	HILLSBOROUGH	USA	Cardiovascular Diseases Research	001	3	6/30/2025	NON-COMPETING CONTINUATION	$56,406
														Subtotal = $564,053

Issue Date FY: 2024 ( Subtotal = $552,772 )
2024	2024	UNIVERSITY OF SOUTH FLORIDA	4202 E FOWLER AVE	TAMPA	FL	33620	HILLSBOROUGH	USA	Cardiovascular Diseases Research	000	2	4/12/2024	NON-COMPETING CONTINUATION	$507,647
2024	2024	UNIVERSITY OF SOUTH FLORIDA	4202 E FOWLER AVE	TAMPA	FL	33620	HILLSBOROUGH	USA	Cardiovascular Diseases Research	001	2	6/22/2024	NON-COMPETING CONTINUATION	$45,125
														Subtotal = $552,772

Issue Date FY: 2023 ( Subtotal = $563,582 )
2023	2023	UNIVERSITY OF SOUTH FLORIDA	4202 E FOWLER AVE	TAMPA	FL	33620	HILLSBOROUGH	USA	Cardiovascular Diseases Research	000	1	3/21/2023	NEW	$563,582
														Subtotal = $563,582

Grand Total All Awards = $2,216,258

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Function and Mechanism of the Intercalated Disc Protein XinB in Cardiomyocyte Proliferation and Cardiac Regeneration

Award Number: R01HL168900

ORGANIZATION: NATIONAL HEART, LUNG, & BLOOD INSTITUTE

OPDIV: NIH

AWARD CLASS: DISCRETIONARY

AWARD ACTIVITY TYPE: SCIENTIFIC/HEALTH RESEARCH (INCLUDES SURVEYS)

PERIOD OF PERFORMANCE START DATE: 04/01/2023

PERIOD OF PERFORMANCE END DATE: 03/31/2027

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