bims-mepmim Biomed News
on Metabolites in pathological microenvironments and immunometabolism
Issue of 2024‒04‒07
seventeen papers selected by
Erika Mariana Palmieri, NIH/NCI Laboratory of Cancer ImmunoMetabolism
  1. Drp1 controls complex II assembly and skeletal muscle metabolism by Sdhaf2 action on mitochondria.
  2. Myeloid-derived suppressor cell mitochondrial fitness governs chemotherapeutic efficacy in hematologic malignancies.
  3. Context-dependent modification of PFKFB3 in hematopoietic stem cells promotes anaerobic glycolysis and ensures stress hematopoiesis.
  4. Widespread S-persulfidation in activated macrophages as a protective mechanism against oxidative-inflammatory stress.
  5. Islet-resident macrophage-derived miR-155 promotes β cell decompensation via targeting PDX1.
  6. The IRG1-itaconate axis protects from cholesterol-induced inflammation and atherosclerosis.
  7. Lactate transporter MCT1 in hepatic stellate cells promotes fibrotic collagen expression in nonalcoholic steatohepatitis.
  8. Oleic acid triggers metabolic rewiring of T cells poising them for T helper 9 differentiation.
  9. Limited oxygen in standard cell culture alters metabolism and function of differentiated cells.
  10. Loss of CREBBP and KMT2D cooperate to accelerate lymphomagenesis and shape the lymphoma immune microenvironment.
  11. Optical imaging reveals chemotherapy-induced metabolic reprogramming of residual disease and recurrence.
  12. Role of the mitochondrial protein cyclophilin D in skin wound healing and collagen.
  13. Maternal circadian rhythm disruption affects neonatal inflammation via metabolic reprograming of myeloid cells.
  14. A clinical-stage Nrf2 activator suppresses osteoclast differentiation via the iron-ornithine axis.
  15. Protective hepatocyte signals restrain liver fibrosis in metabolic dysfunction-associated steatohepatitis.
  16. Intratumor microbiome-derived butyrate promotes lung cancer metastasis.
  17. Tissue-specific transcriptional programming of macrophages controls the microRNA transcriptome targeting multiple functional pathways.
  1. Sci Adv. 2024 Apr 05. 10(14): eadl0389
    Drp1 controls complex II assembly and skeletal muscle metabolism by Sdhaf2 action on mitochondria.
    Zhenqi Zhou, Alice Ma, Timothy M Moore, Dane M Wolf, Nicole Yang, Peter Tran, Mayuko Segawa, Alexander R Strumwasser, Wenjuan Ren, Kai Fu, Jonathan Wanagat, Alexander M van der Bliek, Rachelle Crosbie-Watson, Marc Liesa, Linsey Stiles, Rebecca Acin-Perez, Sushil Mahata, Orian Shirihai, Mark O Goodarzi, Michal Handzlik, Christian M Metallo, David W Walker, Andrea L Hevener.
      The dynamin-related guanosine triphosphatase, Drp1 (encoded by Dnm1l), plays a central role in mitochondrial fission and is requisite for numerous cellular processes; however, its role in muscle metabolism remains unclear. Here, we show that, among human tissues, the highest number of gene correlations with DNM1L is in skeletal muscle. Knockdown of Drp1 (Drp1-KD) promoted mitochondrial hyperfusion in the muscle of male mice. Reduced fatty acid oxidation and impaired insulin action along with increased muscle succinate was observed in Drp1-KD muscle. Muscle Drp1-KD reduced complex II assembly and activity as a consequence of diminished mitochondrial translocation of succinate dehydrogenase assembly factor 2 (Sdhaf2). Restoration of Sdhaf2 normalized complex II activity, lipid oxidation, and insulin action in Drp1-KD myocytes. Drp1 is critical in maintaining mitochondrial complex II assembly, lipid oxidation, and insulin sensitivity, suggesting a mechanistic link between mitochondrial morphology and skeletal muscle metabolism, which is clinically relevant in combatting metabolic-related diseases.
    DOI:  https://doi.org/10.1126/sciadv.adl0389
  2. Nat Commun. 2024 Mar 30. 15(1): 2803
    Myeloid-derived suppressor cell mitochondrial fitness governs chemotherapeutic efficacy in hematologic malignancies.
    Saeed Daneshmandi, Jee Eun Choi, Qi Yan, Cameron R MacDonald, Manu Pandey, Mounika Goruganthu, Nathan Roberts, Prashant K Singh, Richard M Higashi, Andrew N Lane, Teresa W-M Fan, Jianmin Wang, Philip L McCarthy, Elizabeth A Repasky, Hemn Mohammadpour.
      Myeloid derived suppressor cells (MDSCs) are key regulators of immune responses and correlate with poor outcomes in hematologic malignancies. Here, we identify that MDSC mitochondrial fitness controls the efficacy of doxorubicin chemotherapy in a preclinical lymphoma model. Mechanistically, we show that triggering STAT3 signaling via β2-adrenergic receptor (β2-AR) activation leads to improved MDSC function through metabolic reprograming, marked by sustained mitochondrial respiration and higher ATP generation which reduces AMPK signaling, altering energy metabolism. Furthermore, induced STAT3 signaling in MDSCs enhances glutamine consumption via the TCA cycle. Metabolized glutamine generates itaconate which downregulates mitochondrial reactive oxygen species via regulation of Nrf2 and the oxidative stress response, enhancing MDSC survival. Using β2-AR blockade, we target the STAT3 pathway and ATP and itaconate metabolism, disrupting ATP generation by the electron transport chain and decreasing itaconate generation causing diminished MDSC mitochondrial fitness. This disruption increases the response to doxorubicin and could be tested clinically.
    DOI:  https://doi.org/10.1038/s41467-024-47096-9
  3. Elife. 2024 Apr 04. pii: RP87674. [Epub ahead of print]12
    Context-dependent modification of PFKFB3 in hematopoietic stem cells promotes anaerobic glycolysis and ensures stress hematopoiesis.
    Shintaro Watanuki, Hiroshi Kobayashi, Yuki Sugiura, Masamichi Yamamoto, Daiki Karigane, Kohei Shiroshita, Yuriko Sorimachi, Shinya Fujita, Takayuki Morikawa, Shuhei Koide, Motohiko Oshima, Akira Nishiyama, Koichi Murakami, Miho Haraguchi, Shinpei Tamaki, Takehiro Yamamoto, Tomohiro Yabushita, Yosuke Tanaka, Go Nagamatsu, Hiroaki Honda, Shinichiro Okamoto, Nobuhito Goda, Tomohiko Tamura, Ayako Nakamura-Ishizu, Makoto Suematsu, Atsushi Iwama, Toshio Suda, Keiyo Takubo.
      Metabolic pathways are plastic and rapidly change in response to stress or perturbation. Current metabolic profiling techniques require lysis of many cells, complicating the tracking of metabolic changes over time after stress in rare cells such as hematopoietic stem cells (HSCs). Here, we aimed to identify the key metabolic enzymes that define differences in glycolytic metabolism between steady-state and stress conditions in murine HSCs and elucidate their regulatory mechanisms. Through quantitative 13C metabolic flux analysis of glucose metabolism using high-sensitivity glucose tracing and mathematical modeling, we found that HSCs activate the glycolytic rate-limiting enzyme phosphofructokinase (PFK) during proliferation and oxidative phosphorylation (OXPHOS) inhibition. Real-time measurement of ATP levels in single HSCs demonstrated that proliferative stress or OXPHOS inhibition led to accelerated glycolysis via increased activity of PFKFB3, the enzyme regulating an allosteric PFK activator, within seconds to meet ATP requirements. Furthermore, varying stresses differentially activated PFKFB3 via PRMT1-dependent methylation during proliferative stress and via AMPK-dependent phosphorylation during OXPHOS inhibition. Overexpression of Pfkfb3 induced HSC proliferation and promoted differentiated cell production, whereas inhibition or loss of Pfkfb3 suppressed them. This study reveals the flexible and multilayered regulation of HSC glycolytic metabolism to sustain hematopoiesis under stress and provides techniques to better understand the physiological metabolism of rare hematopoietic cells.
    Keywords:  PFKFB3; hematioietic stem cell; metabolomics; mouse; regenerative medicine; single-cell atp analysis; stem cell metabolism; stem cells; stress hematopoiesis
    DOI:  https://doi.org/10.7554/eLife.87674
  4. Redox Biol. 2024 Mar 13. pii: S2213-2317(24)00101-0. [Epub ahead of print]72 103125
    Widespread S-persulfidation in activated macrophages as a protective mechanism against oxidative-inflammatory stress.
    Talal Salti, Ilana Braunstein, Yael Haimovich, Tamar Ziv, Moran Benhar.
      Acute inflammatory responses often involve the production of reactive oxygen and nitrogen species by innate immune cells, particularly macrophages. How activated macrophages protect themselves in the face of oxidative-inflammatory stress remains a long-standing question. Recent evidence implicates reactive sulfur species (RSS) in inflammatory responses; however, how endogenous RSS affect macrophage function and response to oxidative and inflammatory insults remains poorly understood. In this study, we investigated the endogenous pathways of RSS biogenesis and clearance in macrophages, with a particular focus on exploring how hydrogen sulfide (H2S)-mediated S-persulfidation influences macrophage responses to oxidative-inflammatory stress. We show that classical activation of mouse or human macrophages using lipopolysaccharide and interferon-γ (LPS/IFN-γ) triggers substantial production of H2S/RSS, leading to widespread protein persulfidation. Biochemical and proteomic analyses revealed that this surge in cellular S-persulfidation engaged ∼2% of total thiols and modified over 800 functionally diverse proteins. S-persulfidation was found to be largely dependent on the cystine importer xCT and the H2S-generating enzyme cystathionine γ-lyase and was independent of changes in the global proteome. We further investigated the role of the sulfide-oxidizing enzyme sulfide quinone oxidoreductase (SQOR), and found that it acts as a negative regulator of S-persulfidation. Elevated S-persulfidation following LPS/IFN-γ stimulation or SQOR inhibition was associated with increased resistance to oxidative stress. Upregulation of persulfides also inhibited the activation of the macrophage NLRP3 inflammasome and provided protection against inflammatory cell death. Collectively, our findings shed light on the metabolism and effects of RSS in macrophages and highlight the crucial role of persulfides in enabling macrophages to withstand and alleviate oxidative-inflammatory stress.
    Keywords:  Cell death; Inflammation; M1 macrophages; Oxidative stress; Persulfides
    DOI:  https://doi.org/10.1016/j.redox.2024.103125
  5. iScience. 2024 Apr 19. 27(4): 109540
    Islet-resident macrophage-derived miR-155 promotes β cell decompensation via targeting PDX1.
    Yan Zhang, Rong Cong, Tingting Lv, Kerong Liu, Xiaoai Chang, Yating Li, Xiao Han, Yunxia Zhu.
      Chronic inflammation is critical for the initiation and progression of type 2 diabetes mellitus via causing both insulin resistance and pancreatic β cell dysfunction. miR-155, highly expressed in macrophages, is a master regulator of chronic inflammation. Here we show that blocking a macrophage-derived exosomal miR-155 (MDE-miR-155) mitigates the insulin resistances and glucose intolerances in high-fat-diet (HFD) feeding and type-2 diabetic db/db mice. Lentivirus-based miR-155 sponge decreases the level of miR-155 in the pancreas and improves glucose-stimulated insulin secretion (GSIS) ability of β cells, thus leading to improvements of insulin sensitivities in the liver and adipose tissues. Mechanistically, miR-155 increases its expression in HFD and db/db islets and is released as exosomes by islet-resident macrophages under metabolic stressed conditions. MDE-miR-155 enters β cells and causes defects in GSIS function and insulin biosynthesis via the miR-155-PDX1 axis. Our findings offer a treatment strategy for inflammation-associated diabetes via targeting miR-155.
    Keywords:  Cell biology; Immunology; Physiology
    DOI:  https://doi.org/10.1016/j.isci.2024.109540
  6. Proc Natl Acad Sci U S A. 2024 Apr 09. 121(15): e2400675121
    The IRG1-itaconate axis protects from cholesterol-induced inflammation and atherosclerosis.
    Yannick Cyr, Fazli K Bozal, José Gabriel Barcia Durán, Alexandra A C Newman, Letizia Amadori, Panagiotis Smyrnis, Morgane Gourvest, Dayasagar Das, Michael Gildea, Ravneet Kaur, Tracy Zhang, Kristin M Wang, Richard Von Itter, P Martin Schlegel, Samantha D Dupuis, Bernard F Sanchez, Ann Marie Schmidt, Edward A Fisher, Coen van Solingen, Chiara Giannarelli, Kathryn J Moore.
      Atherosclerosis is fueled by a failure to resolve lipid-driven inflammation within the vasculature that drives plaque formation. Therapeutic approaches to reverse atherosclerotic inflammation are needed to address the rising global burden of cardiovascular disease (CVD). Recently, metabolites have gained attention for their immunomodulatory properties, including itaconate, which is generated from the tricarboxylic acid-intermediate cis-aconitate by the enzyme Immune Responsive Gene 1 (IRG1/ACOD1). Here, we tested the therapeutic potential of the IRG1-itaconate axis for human atherosclerosis. Using single-cell RNA sequencing (scRNA-seq), we found that IRG1 is up-regulated in human coronary atherosclerotic lesions compared to patient-matched healthy vasculature, and in mouse models of atherosclerosis, where it is primarily expressed by plaque monocytes, macrophages, and neutrophils. Global or hematopoietic Irg1-deficiency in mice increases atherosclerosis burden, plaque macrophage and lipid content, and expression of the proatherosclerotic cytokine interleukin (IL)-1β. Mechanistically, absence of Irg1 increased macrophage lipid accumulation, and accelerated inflammation via increased neutrophil extracellular trap (NET) formation and NET-priming of the NLRP3-inflammasome in macrophages, resulting in increased IL-1β release. Conversely, supplementation of the Irg1-itaconate axis using 4-octyl itaconate (4-OI) beneficially remodeled advanced plaques and reduced lesional IL-1β levels in mice. To investigate the effects of 4-OI in humans, we leveraged an ex vivo systems-immunology approach for CVD drug discovery. Using CyTOF and scRNA-seq of peripheral blood mononuclear cells treated with plasma from CVD patients, we showed that 4-OI attenuates proinflammatory phospho-signaling and mediates anti-inflammatory rewiring of macrophage populations. Our data highlight the relevance of pursuing IRG1-itaconate axis supplementation as a therapeutic approach for atherosclerosis in humans.
    Keywords:  atherosclerosis; immunometabolism; innate immunity; macrophage; neutrophil
    DOI:  https://doi.org/10.1073/pnas.2400675121
  7. Elife. 2024 Apr 02. pii: RP89136. [Epub ahead of print]12
    Lactate transporter MCT1 in hepatic stellate cells promotes fibrotic collagen expression in nonalcoholic steatohepatitis.
    Kyounghee Min, Batuhan Yenilmez, Mark Kelly, Dimas Echeverria, Michael Elleby, Lawrence M Lifshitz, Naideline Raymond, Emmanouela Tsagkaraki, Shauna M Harney, Chloe DiMarzio, Hui Wang, Nicholas McHugh, Brianna Bramato, Brett Morrison, Jeffery D Rothstein, Anastasia Khvorova, Michael P Czech.
      Circulating lactate is a fuel source for liver metabolism but may exacerbate metabolic diseases such as nonalcoholic steatohepatitis (NASH). Indeed, haploinsufficiency of lactate transporter monocarboxylate transporter 1 (MCT1) in mice reportedly promotes resistance to hepatic steatosis and inflammation. Here, we used adeno-associated virus (AAV) vectors to deliver thyroxin binding globulin (TBG)-Cre or lecithin-retinol acyltransferase (Lrat)-Cre to MCT1fl/fl mice on a choline-deficient, high-fat NASH diet to deplete hepatocyte or stellate cell MCT1, respectively. Stellate cell MCT1KO (AAV-Lrat-Cre) attenuated liver type 1 collagen protein expression and caused a downward trend in trichrome staining. MCT1 depletion in cultured human LX2 stellate cells also diminished collagen 1 protein expression. Tetra-ethylenglycol-cholesterol (Chol)-conjugated siRNAs, which enter all hepatic cell types, and hepatocyte-selective tri-N-acetyl galactosamine (GN)-conjugated siRNAs were then used to evaluate MCT1 function in a genetically obese NASH mouse model. MCT1 silencing by Chol-siRNA decreased liver collagen 1 levels, while hepatocyte-selective MCT1 depletion by AAV-TBG-Cre or by GN-siRNA unexpectedly increased collagen 1 and total fibrosis without effect on triglyceride accumulation. These findings demonstrate that stellate cell lactate transporter MCT1 significantly contributes to liver fibrosis through increased collagen 1 protein expression in vitro and in vivo, while hepatocyte MCT1 appears not to be an attractive therapeutic target for NASH.
    Keywords:  AAV; NAFLD; NASH; RNAi therapeutics; cell biology; human; liver fibrosis; mouse; stellate cells
    DOI:  https://doi.org/10.7554/eLife.89136
  8. iScience. 2024 Apr 19. 27(4): 109496
    Oleic acid triggers metabolic rewiring of T cells poising them for T helper 9 differentiation.
    Nathalie A Reilly, Friederike Sonnet, Koen F Dekkers, Joanneke C Kwekkeboom, Lucy Sinke, Stan Hilt, Hayat M Suleiman, Marten A Hoeksema, Hailiang Mei, Erik W van Zwet, Bart Everts, Andreea Ioan-Facsinay, J Wouter Jukema, Bastiaan T Heijmans.
      T cells are the most common immune cells in atherosclerotic plaques, and the function of T cells can be altered by fatty acids. Here, we show that pre-exposure of CD4+ T cells to oleic acid, an abundant fatty acid linked to cardiovascular events, upregulates core metabolic pathways and promotes differentiation into interleukin-9 (IL-9)-producing cells upon activation. RNA sequencing of non-activated T cells reveals that oleic acid upregulates genes encoding key enzymes responsible for cholesterol and fatty acid biosynthesis. Transcription footprint analysis links these expression changes to the differentiation toward TH9 cells, a pro-atherogenic subset. Spectral flow cytometry shows that pre-exposure to oleic acid results in a skew toward IL-9+-producing T cells upon activation. Importantly, pharmacological inhibition of either cholesterol or fatty acid biosynthesis abolishes this effect, suggesting a beneficial role for statins beyond cholesterol lowering. Taken together, oleic acid may affect inflammatory diseases like atherosclerosis by rewiring T cell metabolism.
    Keywords:  Cell biology; Human metabolism; Immunology; Physiology; Transcriptomics
    DOI:  https://doi.org/10.1016/j.isci.2024.109496
  9. EMBO J. 2024 Apr 05.
    Limited oxygen in standard cell culture alters metabolism and function of differentiated cells.
    Joycelyn Tan, Sam Virtue, Dougall M Norris, Olivia J Conway, Ming Yang, Guillaume Bidault, Christopher Gribben, Fatima Lugtu, Ioannis Kamzolas, James R Krycer, Richard J Mills, Lu Liang, Conceição Pereira, Martin Dale, Amber S Shun-Shion, Harry Jm Baird, James A Horscroft, Alice P Sowton, Marcella Ma, Stefania Carobbio, Evangelia Petsalaki, Andrew J Murray, David C Gershlick, James A Nathan, James E Hudson, Ludovic Vallier, Kelsey H Fisher-Wellman, Christian Frezza, Antonio Vidal-Puig, Daniel J Fazakerley.
      The in vitro oxygen microenvironment profoundly affects the capacity of cell cultures to model physiological and pathophysiological states. Cell culture is often considered to be hyperoxic, but pericellular oxygen levels, which are affected by oxygen diffusivity and consumption, are rarely reported. Here, we provide evidence that several cell types in culture actually experience local hypoxia, with important implications for cell metabolism and function. We focused initially on adipocytes, as adipose tissue hypoxia is frequently observed in obesity and precedes diminished adipocyte function. Under standard conditions, cultured adipocytes are highly glycolytic and exhibit a transcriptional profile indicative of physiological hypoxia. Increasing pericellular oxygen diverted glucose flux toward mitochondria, lowered HIF1α activity, and resulted in widespread transcriptional rewiring. Functionally, adipocytes increased adipokine secretion and sensitivity to insulin and lipolytic stimuli, recapitulating a healthier adipocyte model. The functional benefits of increasing pericellular oxygen were also observed in macrophages, hPSC-derived hepatocytes and cardiac organoids. Our findings demonstrate that oxygen is limiting in many terminally-differentiated cell types, and that considering pericellular oxygen improves the quality, reproducibility and translatability of culture models.
    Keywords:  Cell Culture; Hypoxia; Metabolism/Adipocytes; Oxygen Tension
    DOI:  https://doi.org/10.1038/s44318-024-00084-7
  10. Nat Commun. 2024 Apr 03. 15(1): 2879
    Loss of CREBBP and KMT2D cooperate to accelerate lymphomagenesis and shape the lymphoma immune microenvironment.
    Jie Li, Christopher R Chin, Hsia-Yuan Ying, Cem Meydan, Matthew R Teater, Min Xia, Pedro Farinha, Katsuyoshi Takata, Chi-Shuen Chu, Yiyue Jiang, Jenna Eagles, Verena Passerini, Zhanyun Tang, Martin A Rivas, Oliver Weigert, Trevor J Pugh, Amy Chadburn, Christian Steidl, David W Scott, Robert G Roeder, Christopher E Mason, Roberta Zappasodi, Wendy Béguelin, Ari M Melnick.
      Despite regulating overlapping gene enhancers and pathways, CREBBP and KMT2D mutations recurrently co-occur in germinal center (GC) B cell-derived lymphomas, suggesting potential oncogenic cooperation. Herein, we report that combined haploinsufficiency of Crebbp and Kmt2d induces a more severe mouse lymphoma phenotype (vs either allele alone) and unexpectedly confers an immune evasive microenvironment manifesting as CD8+ T-cell exhaustion and reduced infiltration. This is linked to profound repression of immune synapse genes that mediate crosstalk with T-cells, resulting in aberrant GC B cell fate decisions. From the epigenetic perspective, we observe interaction and mutually dependent binding and function of CREBBP and KMT2D on chromatin. Their combined deficiency preferentially impairs activation of immune synapse-responsive super-enhancers, pointing to a particular dependency for both co-activators at these specialized regulatory elements. Together, our data provide an example where chromatin modifier mutations cooperatively shape and induce an immune-evasive microenvironment to facilitate lymphomagenesis.
    DOI:  https://doi.org/10.1038/s41467-024-47012-1
  11. Sci Adv. 2024 Apr 05. 10(14): eadj7540
    Optical imaging reveals chemotherapy-induced metabolic reprogramming of residual disease and recurrence.
    Enakshi D Sunassee, Riley J Deutsch, Victoria W D'Agostino, Pol Castellano-Escuder, Elizabeth A Siebeneck, Olga Ilkayeva, Brian T Crouch, Megan C Madonna, Jeffrey Everitt, James V Alvarez, Gregory M Palmer, Matthew D Hirschey, Nirmala Ramanujam.
      Fewer than 20% of triple-negative breast cancer patients experience long-term responses to mainstay chemotherapy. Resistant tumor subpopulations use alternative metabolic pathways to escape therapy, survive, and eventually recur. Here, we show in vivo, longitudinal metabolic reprogramming in residual disease and recurrence of triple-negative breast cancer xenografts with varying sensitivities to the chemotherapeutic drug paclitaxel. Optical imaging coupled with metabolomics reported an increase in non-glucose-driven mitochondrial metabolism and an increase in intratumoral metabolic heterogeneity during regression and residual disease in resistant MDA-MB-231 tumors. Conversely, sensitive HCC-1806 tumors were primarily reliant on glucose uptake and minimal changes in metabolism or heterogeneity were observed over the tumors' therapeutic life cycles. Further, day-matched resistant HCC-1806 tumors revealed a higher reliance on mitochondrial metabolism and elevated metabolic heterogeneity compared to sensitive HCC-1806 tumors. Together, metabolic flexibility, increased reliance on mitochondrial metabolism, and increased metabolic heterogeneity are defining characteristics of persistent residual disease, features that will inform the appropriate type and timing of therapies.
    DOI:  https://doi.org/10.1126/sciadv.adj7540
  12. JCI Insight. 2024 Apr 02. pii: e169213. [Epub ahead of print]
    Role of the mitochondrial protein cyclophilin D in skin wound healing and collagen.
    Ritu Bansal, Monica Torres, Matthew Hunt, Nuoqi Wang, Margarita Chatzopoulou, Mansi Manchanda, Evan P Taddeo, Cynthia Shu, Orian S Shirihai, Etty Bachar-Wikstrom, Jakob D Wikstrom.
      Central for wound healing is the formation of granulation tissue, which largely consists of collagen and whose importance stretches past wound healing, including being implicated in both fibrosis and skin aging. Cyclophilin D (CyD) is a mitochondrial protein that regulates the permeability transition pore, known for its role in apoptosis and ischemia-reperfusion. To date, the role of CyD in human wound healing and collagen generation ihas been largely unexplored. Here, we show that CyD was upregulated in normal wounds and venous ulcers, likely adaptive as CyD inhibition impaired re-epithelialization, granulation tissue formation, and wound closure in both human and pig models. Overexpression of CyD increased keratinocyte migration and fibroblast proliferation, whilst its inhibition reduced migration. Independent of wound healing, CyD inhibition in fibroblasts reduced collagen secretion and caused endoplasmic reticulum collagen accumulation, while its overexpression increased collagen secretion. This was confirmed in a Ppif knockout mouse model, which showed a reduction in skin collagen. Overall, this study revealed previously unreported roles of CyD in skin, with implications for wound healing and beyond.
    Keywords:  Collagens; Dermatology; Mitochondria; Skin
    DOI:  https://doi.org/10.1172/jci.insight.169213
  13. Nat Metab. 2024 Apr 01.
    Maternal circadian rhythm disruption affects neonatal inflammation via metabolic reprograming of myeloid cells.
    Zhaohai Cui, Haixu Xu, Fan Wu, Jiale Chen, Lin Zhu, Zhuxia Shen, Xianfu Yi, Jinhao Yang, Chunhong Jia, Lijuan Zhang, Pan Zhou, Mulin Jun Li, Lu Zhu, Shengzhong Duan, Zhi Yao, Ying Yu, Qiang Liu, Jie Zhou.
      Disruption of circadian rhythm during pregnancy produces adverse health outcomes in offspring; however, the role of maternal circadian rhythms in the immune system of infants and their susceptibility to inflammation remains poorly understood. Here we show that disruption of circadian rhythms in pregnant mice profoundly aggravates the severity of neonatal inflammatory disorders in both male and female offspring, such as necrotizing enterocolitis and sepsis. The diminished maternal production of docosahexaenoic acid (DHA) and the impaired immunosuppressive function of neonatal myeloid-derived suppressor cells (MDSCs) contribute to this phenomenon. Mechanistically, DHA enhances the immunosuppressive function of MDSCs via PPARγ-mediated mitochondrial oxidative phosphorylation. Transfer of MDSCs or perinatal supplementation of DHA relieves neonatal inflammation induced by maternal rhythm disruption. These observations collectively demonstrate a previously unrecognized role of maternal circadian rhythms in the control of neonatal inflammation via metabolic reprograming of myeloid cells.
    DOI:  https://doi.org/10.1038/s42255-024-01021-y
  14. Cell Metab. 2024 Mar 28. pii: S1550-4131(24)00084-6. [Epub ahead of print]
    A clinical-stage Nrf2 activator suppresses osteoclast differentiation via the iron-ornithine axis.
    Yimin Dong, Honglei Kang, Renpeng Peng, Zheming Liu, Fuben Liao, Shi-An Hu, Weizhong Ding, Pengju Wang, Pengchao Yang, Meipeng Zhu, Sibo Wang, Minglong Wu, Dawei Ye, Xin Gan, Feng Li, Kehan Song.
      Activating Nrf2 by small molecules is a promising strategy to treat postmenopausal osteoporosis. However, there is currently no Nrf2 activator approved for treating chronic diseases, and the downstream mechanism underlying the regulation of Nrf2 on osteoclast differentiation remains unclear. Here, we found that bitopertin, a clinical-stage glycine uptake inhibitor, suppresses osteoclast differentiation and ameliorates ovariectomy-induced bone loss by activating Nrf2. Mechanistically, bitopertin interacts with the Keap1 Kelch domain and decreases Keap1-Nrf2 binding, leading to reduced Nrf2 ubiquitination and degradation. Bitopertin is associated with less adverse events than clinically approved Nrf2 activators in both mice and human subjects. Furthermore, Nrf2 transcriptionally activates ferroportin-coding gene Slc40a1 to reduce intracellular iron levels in osteoclasts. Loss of Nrf2 or iron supplementation upregulates ornithine-metabolizing enzyme Odc1, which decreases ornithine levels and thereby promotes osteoclast differentiation. Collectively, our findings identify a novel clinical-stage Nrf2 activator and propose a novel Nrf2-iron-ornithine metabolic axis in osteoclasts.
    Keywords:  NRF2; Odc1; Slc40a1; bitopertin; iron; ornithine; osteoclast; osteoporosis
    DOI:  https://doi.org/10.1016/j.cmet.2024.03.005
  15. J Clin Invest. 2024 Apr 01. pii: e179710. [Epub ahead of print]134(7):
    Protective hepatocyte signals restrain liver fibrosis in metabolic dysfunction-associated steatohepatitis.
    Marcella Steffani, Yana Geng, Utpal B Pajvani, Robert F Schwabe.
      Metabolic dysfunction-associated steatotic liver disease (MASLD) affects nearly 40% of the global adult population and may progress to metabolic dysfunction-associated steatohepatitis (MASH), and MASH-associated liver fibrosis and cirrhosis. Despite numerous studies unraveling the mechanism of hepatic fibrogenesis, there are still no approved antifibrotic therapies. The development of MASLD and liver fibrosis results from complex cell-cell interactions that often initiate within hepatocytes but remain incompletely understood. In this issue of the JCI, Yan and colleagues describe an ATF3/HES1/CEBPA/OPN pathway that links hepatocyte signals to fibrogenic activation of hepatic stellate cells and may provide new perspectives on therapeutic options for MASLD-induced liver fibrosis.
    DOI:  https://doi.org/10.1172/JCI179710
  16. Cell Rep Med. 2024 Mar 26. pii: S2666-3791(24)00134-4. [Epub ahead of print] 101488
    Intratumor microbiome-derived butyrate promotes lung cancer metastasis.
    Yi Ma, Haiming Chen, Haoran Li, Meiling Zheng, Xianglin Zuo, Wenxiang Wang, Shaodong Wang, Yiming Lu, Jun Wang, Yun Li, Jie Wang, Mantang Qiu.
      Most recurrences of lung cancer (LC) occur within 3 years after surgery, but the underlying mechanism remains unclear. Here, we collect LC tissues with shorter (<3 years, recurrence group) and longer (>3 years, non-recurrence group) recurrence-free survival. By using 16S sequencing, we find that intratumor microbiome diversity is lower in the recurrence group and butyrate-producing bacteria are enriched in the recurrence group. The intratumor microbiome signature and circulating microbiome DNA can accurately predict LC recurrence. We prove that intratumor injection of butyrate-producing bacteria Roseburia can promote subcutaneous tumor growth. Mechanistically, bacteria-derived butyrate promotes LC metastasis by increasing expression of H19 in tumor cells through inhibiting HDAC2 and increasing H3K27 acetylation at the H19 promoter and inducing M2 macrophage polarization. Depletion of macrophages partially abolishes the metastasis-promoting effect of butyrate. Our results provide evidence for the cross-talk between the intratumor microbiome and LC metastasis and suggest the potential prognostic and therapeutic value of the intratumor microbiome.
    Keywords:  butyrate; lung cancer; macrophage; metastasis; microbiome; recurrence
    DOI:  https://doi.org/10.1016/j.xcrm.2024.101488
  17. J Biol Chem. 2024 Mar 29. pii: S0021-9258(24)01741-1. [Epub ahead of print] 107244
    Tissue-specific transcriptional programming of macrophages controls the microRNA transcriptome targeting multiple functional pathways.
    Magdalena A Czubala, Robert H Jenkins, Mark Gurney, Leah Wallace, Benjamin Cossins, James Dennis, Marcela Rosas, Robert Andrews, Donald Fraser, Philip R Taylor.
      Recent interest in the biology and function of peritoneal tissue resident macrophages (pMΦ) has led to a better understanding of their cellular origin, programming and renewal. The programming of pMΦ is dependent on microenvironmental cues and tissue specific transcription factors, including GATA6. However, the contribution of microRNAs remains poorly defined. We conducted a detailed analysis of the impact of GATA6-deficiency on microRNA expression in mouse pMΦ. Our data suggest that for many of the pMΦ, microRNA composition may be established during tissue specialization, and that the effect of GATA6 knockout is largely unable to be rescued in the adult by exogenous GATA6. The data are consistent with GATA6 modulating the expression pattern of specific microRNAs, directly or indirectly, and including miR-146a, -223, and -203 established by the lineage-determining transcription factor PU.1, to achieve a differentiated pMΦ phenotype. Lastly, we showed a significant dysregulation of miR-708 in pMΦ in the absence of GATA6 during homeostasis and in response to LPS/IFN-γ stimulation. Overexpression of miR-708 in mouse pMΦ in vivo altered 167 mRNA species demonstrating functional downregulation of predicted targets, including cell immune responses and cell cycle regulation. In conclusion, we demonstrate dependence of the microRNA transcriptome on tissue-specific programming of tissue macrophages as exemplified by the role of GATA6 in pMΦ specialization.
    Keywords:  GATA transcription factor; homeostasis; macrophage; microRNA (miRNA); transcriptomics
    DOI:  https://doi.org/10.1016/j.jbc.2024.107244
This page is being maintained by Thomas Krichel. It was last updated on 2024‒04‒15 at 17:17.