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2023 Fiscal Year Final Research Report

Mechanism of Autophagy Disruption in Nonalcoholic Fatty Liver -Involvement of Calcium Dynamics

Research Project

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Project/Area Number 18K15766
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 53010:Gastroenterology-related
Research InstitutionUniversity of Occupational and Environmental Health, Japan

Principal Investigator

Miyagawa Koichiro  産業医科大学, 医学部, 助教 (20566434)

Project Period (FY) 2018-04-01 – 2024-03-31
Keywords脂肪性肝疾患 / オートファジー
Outline of Final Research Achievements

Autophagy is suppressed in the liver of non-alcoholic fatty liver disease (NAFLD) and is thought to contribute to the pathogenesis of the disease. We analyzed the effects of free fatty acids on autophagy in hepatocytes and found that, unlike unsaturated fatty acids, saturated fatty acids inhibit the fusion of autophagosomes and lysosomes, and that this defect is correlated with endoplasmic reticulum stress. We also found that a decrease in calcium concentration in the endoplasmic reticulum was the main factor, and that SERCA, a calcium transport protein, was involved. Therefore, we expected SERCA activators to ameliorate autophagy impairment caused by saturated fatty acids, but unfortunately, we did not find such an effect.

Free Research Field

脂肪性肝疾患 オートファジー

Academic Significance and Societal Importance of the Research Achievements

「遊離脂肪酸とオートファジー」の研究は肝領域のみならず様々な領域でなされているが、現在のところ、オートファジーを促進する化合物はあるものの、超選択的に促進する化合物はなく、ヒトの疾患でオートファジーをターゲットにした治療は限られている。本研究によりオートファジーの障害機序を明らかにすることで「オートファジーの誘導」ではなく、「障害されたオートファジー機能の回復」という新たな治療戦略の基盤作りが可能となることを期待している。現在食事療法や運動療法が主体であるNASHにおいても、本研究によってオートファジーのメカニズムがさらに理解されれば、NASH治療の一助になると考える。

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Published: 2025-01-30  

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