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Mitochondrial mechanotransduction through MIEF1 coordinates the nuclear response to forces

ABSTRACT: Tissue-scale architecture and mechanical properties instruct cell behavior in physiological and diseased conditions, but our understanding of the underlying mechanisms remains fragmentary. Here we show that ECM stiffness, spatial confinements, and applied forces including stretching of the mouse skin regulate mitochondrial dynamics. Actomyosin tension promotes phosphorylation of MIEF1, limiting the recruitment of DRP1 at mitochondria, peri-mitochondrial F-actin formation, and mitochondrial fission. Strikingly, mitochondrial fission is also a general mechanotransduction mechanism. Indeed we found that DRP1- and MIEF1-dependent fission is required and sufficient to regulate three transcription factors of broad relevance such as YAP-TAZ, SREBP1-2, and NRF2 to control cell proliferation, lipogenesis, antioxidant metabolism, chemotherapy resistance, and adipocyte differentiation in response to mechanical cues. This extends to the mouse liver, where DRP1 regulates hepatocyte proliferation and identity, hallmark YAP-dependent phenotypes. We propose that mitochondria fulfill a unifying signaling function by which the mechanical tissue microenvironment coordinates complementary cell functions.

INSTRUMENT(S): Q Exactive HF

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Cell Culture

SUBMITTER: Sirio Dupont

LAB HEAD: Sirio Dupont

PROVIDER: PXD040502 | Pride | 2024-09-02

REPOSITORIES: Pride

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			Action	DRS
	2021-09-16_MS_FS_PhosphoProteomics_Dupont_DMSO_16.raw	Raw
	2021-09-16_MS_FS_PhosphoProteomics_Dupont_DMSO_17.raw	Raw
	2021-09-16_MS_FS_PhosphoProteomics_Dupont_DMSO_18.raw	Raw
	2021-09-16_MS_FS_PhosphoProteomics_Dupont_DMSO_19.raw	Raw
	2021-09-16_MS_FS_PhosphoProteomics_Dupont_YM2h_20.raw	Raw

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Project description:Purpose:to verify Drp1-mediated biological pathways under physiological and ischemia conditions.Methods:C57BL/6 mice and Drp1 knockdown mice were used for ischemia treatment. Right femoral arteries were catheterized with polyethylene catheters for bleeding 50% of total blood volume (≈7% of weight). The ischemia time started to calculate after the model was established. A laparotomy was then carried out to obtain superior mesenteric artery tissues (SMAs) for transcriptome analysis. Series-Cluster analysis was performed to identify the global trends of mitochondrial DEGs after Drp1 knockdown. Gene ontology (GO) analysis was performed to facilitate elucidating the biological process (BP), molecular function (MF) and cellular component (CC) of unique genes in the significant or representative profiles. Results:In addition to its traditional roles in GTPase regulation and mitochondrial fission, Drp1 may also regulate actin cytoskeleton and the movement of microtubules. Besides, Drp1 may participate in the regulation of morphology and functions of other organelles, including endoplasmic reticulum, peroxisome, phagolysosome, etc. As for general organ functions, Drp1 may regulate vascular constriction and dilation. These consequences indicated the important role of Drp1 in ischemia-induced cellular regulation. Conclusions: Drp1 deficiency proves the important role of Drp1 in ischemia-induced biomedical processes through multiple potential fission-independent manners. Methods:C57BL/6 mice and Drp1 knockdown mice were used for ischemia treatment. Right femoral arteries were catheterized with polyethylene catheters for bleeding 50% of total blood volume (≈7% of weight). The ischemia time started to calculate after the model was established. A laparotomy was then carried out to obtain superior mesenteric artery tissues (SMAs) for transcriptome analysis. Series-Cluster analysis was performed to identify the global trends of mitochondrial DEGs after Drp1 knockdown. Gene ontology (GO) analysis was performed to facilitate elucidating the biological process (BP), molecular function (MF) and cellular component (CC) of unique genes in the significant or representative profiles. Results:In addition to its traditional roles in GTPase regulation and mitochondrial fission, Drp1 may also regulate actin cytoskeleton and the movement of microtubules. Besides, Drp1 may participate in the regulation of morphology and functions of other organelles, including endoplasmic reticulum, peroxisome, phagolysosome, etc. As for general organ functions, Drp1 may regulate vascular constriction and dilation. These consequences indicated the important role of Drp1 in ischemia-induced cellular regulation. Conclusions: Drp1 deficiency proves the important role of Drp1 in ischemia-induced biomedical processes through multiple potential fission-independent manners.

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Mitochondrial mechanotransduction through MIEF1 coordinates the nuclear response to forces

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