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Mechanisms of gallbladder smooth muscle dysfunction

Award Number: R01DK131044
ORGANIZATION: NATIONAL INSTITUTE OF DIABETES & DIGESTIVE & KIDNEY DISEASES
OPDIV: NIH
AWARD CLASS: DISCRETIONARY
AWARD ACTIVITY TYPE: SCIENTIFIC/HEALTH RESEARCH (INCLUDES SURVEYS)
PERIOD OF PERFORMANCE START DATE: 07/18/2022
PERIOD OF PERFORMANCE END DATE: 05/31/2026

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Mechanisms of gallbladder smooth muscle dysfunction - Gallbladder disease is one of the most common digestive disorders, and hallmark properties include decreased contractility, inflammation, and gallstone formation. Three features are consistently associated with gallstone disease: (1) elevated cholesterol hydrophobic salt and triglyceride (TG) levels in the bile; (2) inflammation of the gallbladder; and (3) impairments in gallbladder tone and contractility. Nevertheless, the interrelationships between decreased gallstone formation, inflammation, and contractility are not understood, and this reflects our lack of understanding of the cellular events that lead to decreased resting tone and postprandial contractions in gallbladder disease. This grant application proposes to address these fundamental gaps in our knowledge. The overall objectives of this grant application are to: (1) elucidate the cellular and ionic mechanisms by which gallbladder smooth muscle (GBSM) contractility is disrupted in gallstone disease; (2) determine the role of inflammation in smooth muscle dysfunction and associated biliary stasis in gallstone disease; and (3) explore the utility of hydrophilic bile salts in the protection of gallbladder function by preventing or reversing these disruptions to GBSM. We will use wild type and transgenic mice fed a lithogenic (gallstone forming) diet to evaluate the functional changes that occur in GBSM and interstitial cells of Cajal (ICC) during the progression of gallstone disease in normal mice and mice that do not develop gallbladder inflammation. We will also evaluate GBSM function in mice fed a lithogenic diet while being treated with a cyclooxygenase inhibitor, or the protective hydrophilic bile salt, ursodeoxycholic acid (UDCA). The second model involves evaluation of the effects of cholesterol and hydrophobic bile salts applied in vitro to gallbladder muscularis preparations, with or without prior application of UDCA. This approach allows us to examine the actions of these compounds, individually or together, on GBSM and ICC in a controlled environment. This grant proposal involves an integrated approach using state-of-the-art techniques to investigate gallbladder pathophysiology from single molecules to intact tissue during the progression of disease in the animal. Techniques to be used include optogenetic Ca2+ imaging of GBSM cells and ICC in intact muscle bundles, intracellular and patch clamp recording from intact and isolated GBSM cells, respectively, and muscularis tension measurements. Together with our previous studies on smooth muscle function, we will provide insights on how gallbladder motor function is disrupted leading to biliary stasis, and the interrelationship between disrupted motor function and inflammation. Furthermore, these studies will elucidate the therapeutic potential of UDCA to prevent or reverse cellular changes in GBSM/ICC that underlie decreased gallbladder contractility, and uncover the cellular mechanisms that mediate their actions in the gallbladder.


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: 2025 ( Subtotal = $542,467 )
2025	2025	UNIVERSITY OF VERMONT & STATE AGRICULTURAL COLLEGE	85 S PROSPECT STREET	BURLINGTON	VT	05405	CHITTENDEN	USA	Diabetes, Digestive, and Kidney Diseases Extramural Research	000	4	6/13/2025	NON-COMPETING CONTINUATION	$542,467
														Subtotal = $542,467

Issue Date FY: 2024 ( Subtotal = $520,768 )
2024	2024	UNIVERSITY OF VERMONT & STATE AGRICULTURAL COLLEGE	85 S PROSPECT STREET	BURLINGTON	VT	05405	CHITTENDEN	USA	Diabetes, Digestive, and Kidney Diseases Extramural Research	001	3	5/30/2024	NON-COMPETING CONTINUATION	$520,768
2024	2023	UNIVERSITY OF VERMONT & STATE AGRICULTURAL COLLEGE	85 S PROSPECT STREET	BURLINGTON	VT	05405	CHITTENDEN	USA	Diabetes, Digestive, and Kidney Diseases Extramural Research	000	2	5/16/2024	NON-COMPETING CONTINUATION	$0
														Subtotal = $520,768

Issue Date FY: 2023 ( Subtotal = $542,467 )
2023	2023	UNIVERSITY OF VERMONT & STATE AGRICULTURAL COLLEGE	85 S PROSPECT STREET	BURLINGTON	VT	05405	CHITTENDEN	USA	Diabetes, Digestive, and Kidney Diseases Extramural Research	000	2	5/23/2023	NON-COMPETING CONTINUATION	$542,467
														Subtotal = $542,467

Issue Date FY: 2022 ( Subtotal = $555,918 )
2022	2022	UNIVERSITY OF VERMONT & STATE AGRICULTURAL COLLEGE	85 S PROSPECT ST	BURLINGTON	VT	05405	CHITTENDEN	USA	Diabetes, Digestive, and Kidney Diseases Extramural Research	000	1	7/18/2022	NEW	$555,918
														Subtotal = $555,918

Grand Total All Awards = $2,161,620

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Mechanisms of gallbladder smooth muscle dysfunction

Award Number: R01DK131044

ORGANIZATION: NATIONAL INSTITUTE OF DIABETES & DIGESTIVE & KIDNEY DISEASES

OPDIV: NIH

AWARD CLASS: DISCRETIONARY

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

PERIOD OF PERFORMANCE START DATE: 07/18/2022

PERIOD OF PERFORMANCE END DATE: 05/31/2026

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