• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

The Pathophysiological Factors Driving Diastolic Dysfunction of the Right Heart in Pulmonary Hypertension

Research Project

Project/Area Number 22K15368
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 48020:Physiology-related
Research InstitutionNational Cardiovascular Center Research Institute

Principal Investigator

Waddingham Mark  国立研究開発法人国立循環器病研究センター, 研究所, 上級研究員 (70822211)

Project Period (FY) 2022-04-01 – 2025-03-31
Project Status Granted (Fiscal Year 2023)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2024: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2023: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
KeywordsPulmonary Hypertension / Right Ventricle / Myocardium / Diastolic Dysfunction / Sarcomere / Myofilaments / Heat Shock Proteins / Cardiomyocyte / Microtubules
Outline of Research at the Start

Pulmonary hypertension (PH) patients often succumb to the associated right ventricle (RV) failure, for which there are no effective therapies. In this project, I will investigate the mechanisms underlying the development of RV diastolic dysfunction in 2 models of PH along with a novel treatment strategy for RV diastolic dysfunction. This project will utilise a "whole heart-to-myofilament" approach with numerous experimental techniques. It is hoped that this project will help enhance our understanding of RV failure development and evaluate a novel and rapidly translatable therapy.

Outline of Annual Research Achievements

In FY2023, I have expanded upon our previous in vivo findings and completed a full Group 2 pulmonary hypertension model study using the Dahl-Iwai salt-sensitive (DIS)/4% NaCl diet (as previously described) and included normal diet DIS/DIR rats as controls. Briefly, we have demonstrated that DIS rats exposed to a 4% NaCl diet for 12-weeks exhibit subtle RV systolic and diastolic dysfunction in the absence of overt pulmonary hypertension (PH). Although challenging, the biochemical analysis of myofilament proteins conducted thus far has revealed that changes in the phosphorylation status of key myofilament regulatory proteins cMyBP-C, cTnI and MLC-2 correlate with the changes in RV function in the DIS rats.

Current Status of Research Progress
Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

The Group 2 pulmonary hypertension model study is completed along with the full hemodynamic analysis. The collation and full interpretation of the hemodynamic data is near completion. Biochemical, histological and cardiomyocyte function experiments are underway with most already showing promising results. Moreover, myocardial x-ray diffraction studies at SPring-8 Synchrotron should be undertaken in late 2024/early 2025.

Strategy for Future Research Activity

1. For the Group 2 pulmonary hypertension study, it is anticipated that the final collation and interpretation of the hemodynamic data will be completed by summer 2024. The biochemical, histological and cardiomyocyte function experiments are underway, but due to complexity of these experiments I expect that these will take a majority of 2024 to complete.
2. Myocardial x-ray diffraction studies at SPring-8 Synchrotron are planned for late 2024 or early 2025.
3. For the Group 1 PH studies, I will begin studies to investigate if boosting small heat shock proteins within the myocardium may be a useful therapeutic strategy to alleviate RV diastolic dysfunction associated with pulmonary hypertension. These studies will begin in spring 2024.

Report

(2 results)
  • 2023 Research-status Report
  • 2022 Research-status Report
  • Research Products

    (5 results)

All 2024 2023 2022

All Presentation (5 results) (of which Int'l Joint Research: 2 results,  Invited: 2 results)

  • [Presentation] Myofilament changes may drive right ventricular dysfunction ahead of pulmonary hypertension in a rat model of left ventricular diastolic dysfunction.2024

    • Author(s)
      Mark T. Waddingham, Hirotsugu Tsuchimochi, Takeshi Ogo, James T. Pearson
    • Organizer
      The 101st Annual Meeting of The Physiological Society of Japan
    • Related Report
      2023 Research-status Report
    • Invited
  • [Presentation] Myofilament changes may drive right ventricular dysfunction ahead of pulmonary hypertension in a rat model of left ventricular diastolic dysfunction.2023

    • Author(s)
      Mark T. Waddingham, Hirotsugu Tsuchimochi, Takeshi Ogo, James T. Pearson
    • Organizer
      The 7th JCS Council Forum on Basic Cardiovascular Research
    • Related Report
      2023 Research-status Report
  • [Presentation] Myofilament protein post-translational modifications may underlie right ventricular dysfunction in pulmonary hypertension2023

    • Author(s)
      Waddingham MT, Tsuchimochi H, Ogo T, Pearson JT
    • Organizer
      The 100th Anniversary Annual Meeting of The Physiological Society of Japan
    • Related Report
      2022 Research-status Report
  • [Presentation] The Super Relaxed State of Myosin Contributes to the Pathogenesis of Right Ventricular Dysfunction in Pulmonary Hypertension2022

    • Author(s)
      Waddingham MT, Tsuchimochi H, Asano R, Sonobe T, Higuchi T, Aoyama K, Shirai M, Pearson JT, Ogo T
    • Organizer
      American Heart Association Scientific Sessions 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Myofilament protein post-translational modifications may underlie right ventricular dysfunction in pulmonary hypertension2022

    • Author(s)
      Waddingham MT, Tsuchimochi H, Ogo T, Pearson JT
    • Organizer
      The 6th JCS Council Forum on Basic CardioVascular Research (JCS Council-BCVR)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research

URL: 

Published: 2022-04-19   Modified: 2024-12-25  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi