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Yin Y, Cui Q, Zhao J, Wu Q, Sun Q, Wang HQ, Yang W. Integrated Bioinformatics and Machine Learning Analysis Identify ACADL as a Potent Biomarker of Reactive Mesothelial Cells. THE AMERICAN JOURNAL OF PATHOLOGY 2024; 194:1294-1305. [PMID: 38657836 DOI: 10.1016/j.ajpath.2024.03.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 02/05/2024] [Accepted: 03/22/2024] [Indexed: 04/26/2024]
Abstract
Mesothelial cells with reactive hyperplasia are difficult to distinguish from malignant mesothelioma cells based on cell morphology. This study aimed to identify and validate potential biomarkers that distinguish mesothelial cells from mesothelioma cells through machine learning combined with immunohistochemistry. It integrated the gene expression matrix from three Gene Expression Omnibus data sets (GSE2549, GSE12345, and GSE51024) to analyze the differently expressed genes between normal and mesothelioma tissues. Then, three machine learning algorithms, least absolute shrinkage and selection operator, support vector machine recursive feature elimination, and random forest were used to screen and obtain four shared candidate markers, including ACADL, EMP2, GPD1L, and HMMR. The receiver operating characteristic curve analysis showed that the area under the curve for distinguishing normal mesothelial cells from mesothelioma was 0.976, 0.943, 0.962, and 0.956, respectively. The expression and diagnostic performance of these candidate genes were validated in two additional independent data sets (GSE42977 and GSE112154), indicating that the performances of ACADL, GPD1L, and HMMR were consistent between the training and validation data sets. Finally, the optimal candidate marker ACADL was verified by immunohistochemistry assay. Acyl-CoA dehydrogenase long chain (ACADL) was stained strongly in mesothelial cells, especially for reactive hyperplasic mesothelial cells, but was negative in malignant mesothelioma cells. Therefore, ACADL has the potential to be used as a specific marker of reactive hyperplasic mesothelial cells in the differential diagnosis of mesothelioma.
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Affiliation(s)
- Yige Yin
- School of Basic Medical Sciences, Anhui Medical University, Hefei, China; Anhui Province Key Laboratory of Medical Physics and Technology, Institute of Health and Medical Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Qianwen Cui
- Anhui Province Key Laboratory of Medical Physics and Technology, Institute of Health and Medical Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China; Science Island Branch, Graduate School of University of Science and Technology of China, Hefei, China
| | - Jiarong Zhao
- Anhui Province Key Laboratory of Medical Physics and Technology, Institute of Health and Medical Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China; Medical Pathology Center, Hefei Cancer Hospital, Chinese Academy of Sciences, Hefei, China
| | - Qiang Wu
- School of Basic Medical Sciences, Anhui Medical University, Hefei, China; Department of Pathology, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Qiuyan Sun
- Anhui Province Key Laboratory of Medical Physics and Technology, Institute of Health and Medical Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China; Medical Pathology Center, Hefei Cancer Hospital, Chinese Academy of Sciences, Hefei, China
| | - Hong-Qiang Wang
- Biological Molecular Information System Laboratory, Institute of Intelligent Machines, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Wulin Yang
- School of Basic Medical Sciences, Anhui Medical University, Hefei, China; Anhui Province Key Laboratory of Medical Physics and Technology, Institute of Health and Medical Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China; Science Island Branch, Graduate School of University of Science and Technology of China, Hefei, China.
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Dey P, Rajalaxmi S, Saha P, Thakur PS, Hashmi MA, Lal H, Saini N, Singh N, Ramanathan A. Cold-shock proteome of myoblasts reveals role of RBM3 in promotion of mitochondrial metabolism and myoblast differentiation. Commun Biol 2024; 7:515. [PMID: 38688991 PMCID: PMC11061143 DOI: 10.1038/s42003-024-06196-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Accepted: 04/15/2024] [Indexed: 05/02/2024] Open
Abstract
Adaptation to hypothermia is important for skeletal muscle cells under physiological stress and is used for therapeutic hypothermia (mild hypothermia at 32 °C). We show that hypothermic preconditioning at 32 °C for 72 hours improves the differentiation of skeletal muscle myoblasts using both C2C12 and primary myoblasts isolated from 3 month and 18-month-old mice. We analyzed the cold-shock proteome of myoblasts exposed to hypothermia (32 °C for 6 and 48 h) and identified significant changes in pathways related to RNA processing and central carbon, fatty acid, and redox metabolism. The analysis revealed that levels of the cold-shock protein RBM3, an RNA-binding protein, increases with both acute and chronic exposure to hypothermic stress, and is necessary for the enhanced differentiation and maintenance of mitochondrial metabolism. We also show that overexpression of RBM3 at 37 °C is sufficient to promote mitochondrial metabolism, cellular proliferation, and differentiation of C2C12 and primary myoblasts. Proteomic analysis of C2C12 myoblasts overexpressing RBM3 show significant enrichment of pathways involved in fatty acid metabolism, RNA metabolism and the electron transport chain. Overall, we show that the cold-shock protein RBM3 is a critical factor that can be used for controlling the metabolic network of myoblasts.
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Affiliation(s)
- Paulami Dey
- Institute for Stem Cell Science and Regenerative Medicine (inStem), GKVK-Post, Bellary Rd, Bengaluru, 560065, Karnataka, India
- SASTRA Deemed University, Tirumalaisamudram, Thanjavur, 613401, Tamil Nadu, India
| | - Srujanika Rajalaxmi
- Institute for Stem Cell Science and Regenerative Medicine (inStem), GKVK-Post, Bellary Rd, Bengaluru, 560065, Karnataka, India
| | - Pushpita Saha
- Institute for Stem Cell Science and Regenerative Medicine (inStem), GKVK-Post, Bellary Rd, Bengaluru, 560065, Karnataka, India
| | - Purvi Singh Thakur
- Institute for Stem Cell Science and Regenerative Medicine (inStem), GKVK-Post, Bellary Rd, Bengaluru, 560065, Karnataka, India
| | - Maroof Athar Hashmi
- Institute for Stem Cell Science and Regenerative Medicine (inStem), GKVK-Post, Bellary Rd, Bengaluru, 560065, Karnataka, India
- Manipal Academy of Higher Education, Manipal, 576104, Karnataka, India
| | - Heera Lal
- Institute for Stem Cell Science and Regenerative Medicine (inStem), GKVK-Post, Bellary Rd, Bengaluru, 560065, Karnataka, India
- Manipal Academy of Higher Education, Manipal, 576104, Karnataka, India
| | - Nistha Saini
- Institute for Stem Cell Science and Regenerative Medicine (inStem), GKVK-Post, Bellary Rd, Bengaluru, 560065, Karnataka, India
| | - Nirpendra Singh
- Institute for Stem Cell Science and Regenerative Medicine (inStem), GKVK-Post, Bellary Rd, Bengaluru, 560065, Karnataka, India
| | - Arvind Ramanathan
- Institute for Stem Cell Science and Regenerative Medicine (inStem), GKVK-Post, Bellary Rd, Bengaluru, 560065, Karnataka, India.
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Li A, Li Y, Wang Y, Wang Y, Li X, Qubi W, Xiong Y, Zhu J, Liu W, Lin Y. ACADL Promotes the Differentiation of Goat Intramuscular Adipocytes. Animals (Basel) 2023; 13:ani13020281. [PMID: 36670821 PMCID: PMC9854987 DOI: 10.3390/ani13020281] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 01/04/2023] [Accepted: 01/09/2023] [Indexed: 01/14/2023] Open
Abstract
Intramuscular fat (IMF) deposits help improve meat quality such as marbling, juicy, flavor and tenderness. Long-chain acyl-CoA dehydrogenase (ACADL) is a key enzyme for catalyzing fatty acid oxidation, and studies have shown ACADL is involved in the deposition and differentiation of intramuscular adipocytes. However, the effect of ACADL on intramuscular adipocytes differentiation in goats needs further study. In this study, to explore the mechanism of ACADL on the development of goat intramuscular adipocytes, we constructed an over-expression plasmids and a SI-RNA of ACADL to explore the function of ACADL on the development of goat IMF. It was found that overexpression of ACADL promoted the differentiation of goat intramuscular adipocytes, and promoted the expression of fat cell differentiation marker genes lipoprotein lipase (LPL), peroxisome proliferator activated receptor gamma (PPARγ), APETALA-2-like transcription factor gene (AP2), CCAT enhancer binding protein (CEBPα), preadipocyte Factor 1 (Pref-1) and CCAT enhancer binding protein (CEBPβ), and the opposite trend occurred after interference. In addition, we screened of this related tumor necrosis factor (TNF) signaling pathway by RNA-Seq. So, we validate the signaling pathway with inhibitor of TNF signaling pathway. In summary, these results indicate that ACADL promotes intramuscular adipocytes differentiation through activation TNF signaling pathway. This study provides an important basis for the mechanism of IMF development.
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Affiliation(s)
- An Li
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Southwest Minzu University, Chengdu 610041, China
- Key Laboratory of Sichuan Province for Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Exploitation, Southwest Minzu University, Chengdu 610041, China
- College of Animal Science and Veterinary Medicine, Southwest Minzu University, Chengdu 610041, China
| | - Yanyan Li
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Southwest Minzu University, Chengdu 610041, China
- Key Laboratory of Sichuan Province for Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Exploitation, Southwest Minzu University, Chengdu 610041, China
- College of Animal Science and Veterinary Medicine, Southwest Minzu University, Chengdu 610041, China
| | - Youli Wang
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Southwest Minzu University, Chengdu 610041, China
- Key Laboratory of Sichuan Province for Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Exploitation, Southwest Minzu University, Chengdu 610041, China
- College of Animal Science and Veterinary Medicine, Southwest Minzu University, Chengdu 610041, China
| | - Yong Wang
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Southwest Minzu University, Chengdu 610041, China
- Key Laboratory of Sichuan Province for Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Exploitation, Southwest Minzu University, Chengdu 610041, China
- College of Animal Science and Veterinary Medicine, Southwest Minzu University, Chengdu 610041, China
| | - Xin Li
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Southwest Minzu University, Chengdu 610041, China
- Key Laboratory of Sichuan Province for Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Exploitation, Southwest Minzu University, Chengdu 610041, China
- College of Animal Science and Veterinary Medicine, Southwest Minzu University, Chengdu 610041, China
| | - Wuqie Qubi
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Southwest Minzu University, Chengdu 610041, China
- Key Laboratory of Sichuan Province for Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Exploitation, Southwest Minzu University, Chengdu 610041, China
- College of Animal Science and Veterinary Medicine, Southwest Minzu University, Chengdu 610041, China
| | - Yan Xiong
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Southwest Minzu University, Chengdu 610041, China
- Key Laboratory of Sichuan Province for Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Exploitation, Southwest Minzu University, Chengdu 610041, China
- College of Animal Science and Veterinary Medicine, Southwest Minzu University, Chengdu 610041, China
| | - Jiangjiang Zhu
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Southwest Minzu University, Chengdu 610041, China
- Key Laboratory of Sichuan Province for Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Exploitation, Southwest Minzu University, Chengdu 610041, China
| | - Wei Liu
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Southwest Minzu University, Chengdu 610041, China
- Key Laboratory of Sichuan Province for Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Exploitation, Southwest Minzu University, Chengdu 610041, China
- College of Animal Science and Veterinary Medicine, Southwest Minzu University, Chengdu 610041, China
| | - Yaqiu Lin
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Southwest Minzu University, Chengdu 610041, China
- Key Laboratory of Sichuan Province for Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Exploitation, Southwest Minzu University, Chengdu 610041, China
- College of Animal Science and Veterinary Medicine, Southwest Minzu University, Chengdu 610041, China
- Correspondence: ; Tel./Fax: +86-028-85522310
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ACADL plays a tumor-suppressor role by targeting Hippo/YAP signaling in hepatocellular carcinoma. NPJ Precis Oncol 2020; 4:7. [PMID: 32219176 PMCID: PMC7096519 DOI: 10.1038/s41698-020-0111-4] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Accepted: 02/14/2020] [Indexed: 12/25/2022] Open
Abstract
Long-chain acyl-CoA dehydrogenase (ACADL) is a mitochondrial enzyme that catalyzes the initial step of fatty acid oxidation, but the role of ACADL in tumor biology remains largely unknown. Here, we found that ACADL was frequently downregulated in hepatocellular carcinoma (HCC), and its low expression was significantly correlated with poor clinical prognosis of HCC patients. Restoring the expression of ACADL in HCC cells resulted cell cycle arrest and growth suppression through suppressing Hippo/YAP signaling evidenced by decreased YAP nuclear accumulation and downstream target genes expression. Reactivation of YAP by XMU-MP-1 diminished the inhibitory effect of ACADL on HCC growth. More importantly, the nuclear accumulation of YAP was negatively correlated with ACADL expression levels in HCC specimens, and YAP inhibitor verteporfin effectively suppressed growth of HCC organoids with low ACADL expression. Together, our findings highlight a novel function of ACADL in regulating HCC growth and targeting ACADL/Yap may be a potential strategy for HCC precise treatment.
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Yu DL, Li HW, Wang Y, Li CQ, You D, Jiang L, Song YP, Li XH. Acyl-CoA dehydrogenase long chain expression is associated with esophageal squamous cell carcinoma progression and poor prognosis. Onco Targets Ther 2018; 11:7643-7653. [PMID: 30464513 PMCID: PMC6217208 DOI: 10.2147/ott.s171963] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Background Acyl-CoA dehydrogenase long chain (ACADL) was revealed to have a correlation with malignant progression of cancer. However, whether ACADL plays a role in clinical therapy remains unclear. The clinicopathological role of ACADL in esophageal squamous cell carcinoma (ESCC) will be discussed in this study. Materials and methods The expression of ACADL was analyzed via real-time PCR and Western blotting to assess mRNA and protein levels in ESCC cell lines and normal esophageal epithelial cells (NEECs), in six paired ESCC tumors and relative normal tissues. Furthermore, immunohistochemical staining was performed on 135 paraffin-embedded ESCC specimens to assess ACADL expression. The clinicopathological significance of ACADL expression was further investigated via survival analysis and Cox regression analysis. Results ACADL was found to be markedly upregulated in ESCC cell lines when compared with NEECs. Moreover, various experiments such as quantitative real-time PCR, Western blot, and immunohistochemical analyses all revealed that ACADL expression was increased in all six paired ESCC tumors and matched normal tissues. Furthermore, immunohistochemical analysis revealed an increased level of ACADL protein expression in all 135 paraffin-embedded samples from ESCC patients, which increased with disease progression. Conclusion We demonstrated that ACADL is overexpressed in ESCC, both in cell lines and clinical specimens. ACADL is found to be a vital regulator in ESCC progression and can predict a worse outcome for ESCC patients, suggesting that ACADL might be a valuable molecule to be targeted for clinical therapy of ESCC treatment.
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Affiliation(s)
- Dong-Lin Yu
- Department of basic Theory of traditional Chinese Medicine, Binzhou Medical University, Yantai, People's Republic of China
| | - Hong-Wei Li
- Department of Radiotherapy, The Affiliated Yantai Yuhuangding Hospital of Qingdao University, Yantai, People's Republic of China, ;
| | - Yang Wang
- Department of Radiotherapy, The Affiliated Yantai Yuhuangding Hospital of Qingdao University, Yantai, People's Republic of China, ;
| | - Cun-Qi Li
- Department of Radiotherapy, The Affiliated Yantai Yuhuangding Hospital of Qingdao University, Yantai, People's Republic of China, ;
| | - Dong You
- Department of Radiotherapy, The Affiliated Yantai Yuhuangding Hospital of Qingdao University, Yantai, People's Republic of China, ;
| | - Lei Jiang
- Department of Pathology, The Affiliated Yantai Yuhuangding Hospital of Qingdao University, Yantai, People's Republic of China
| | - Yi-Peng Song
- Department of Radiotherapy, The Affiliated Yantai Yuhuangding Hospital of Qingdao University, Yantai, People's Republic of China, ;
| | - Xing-Hua Li
- Department of Radiotherapy, The Affiliated Yantai Yuhuangding Hospital of Qingdao University, Yantai, People's Republic of China, ;
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Li B, Tian X, Wang C, Zeng X, Xing Y, Ling H, Yin W, Tian L, Meng Z, Zhang J, Guo S. SWATH label-free proteomics analyses revealed the roles of oxidative stress and antioxidant defensing system in sclerotia formation of Polyporus umbellatus. Sci Rep 2017; 7:41283. [PMID: 28134344 PMCID: PMC5278369 DOI: 10.1038/srep41283] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Accepted: 12/19/2016] [Indexed: 02/03/2023] Open
Abstract
Understanding the initiation and maturing mechanisms is important for rational manipulating sclerotia differentiation and growth from hypha of Polyporus umbellatus. Proteomes in P. umbellatus sclerotia and hyphae at initial, developmental and mature phases were studied. 1391 proteins were identified by nano-liquid chromatograph-mass spectrometry (LC-MS) in Data Dependant Acquisition mode, and 1234 proteins were quantified successfully by Sequential Window Acquisition of all THeoretical fragment ion spectra-MS (SWATH-MS) technology. There were 347 differentially expressed proteins (DEPs) in sclerotia at initial phase compared with those in hypha, and the DEP profiles were dynamically changing with sclerotia growth. Oxidative stress (OS) in sclerotia at initial phase was indicated by the repressed proteins of respiratory chain, tricarboxylic acid cycle and the activation of glycolysis/gluconeogenesis pathways were determined based on DEPs. The impact of glycolysis/gluconeogenesis on sclerotium induction was further verified by glycerol addition assays, in which 5% glycerol significantly increased sclerotial differentiation rate and biomass. It can be speculated that OS played essential roles in triggering sclerotia differentiation from hypha of P. umbellatus, whereas antioxidant activity associated with glycolysis is critical for sclerotia growth. These findings reveal a mechanism for sclerotial differentiation in P. umbellatus, which may also be applicable for other fungi.
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Affiliation(s)
- Bing Li
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100193 P. R. China
| | - Xiaofang Tian
- Pharmaceutical department of China-Japan Friendship Hospital, Beijing 100029 P. R. China
| | - Chunlan Wang
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100193 P. R. China
| | - Xu Zeng
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100193 P. R. China
| | - Yongmei Xing
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100193 P. R. China
| | - Hong Ling
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100193 P. R. China
| | - Wanqiang Yin
- Tianjin University of Science & Technology, Tianjin 300457, P. R. China
| | - Lixia Tian
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100193 P. R. China
| | - Zhixia Meng
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100193 P. R. China
| | - Jihui Zhang
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, P. R. China
| | - Shunxing Guo
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100193 P. R. China
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Li L, Ma Y. Effects of metal ions on growth, β-oxidation system, and thioesterase activity of Lactococcus lactis. J Dairy Sci 2014; 97:5975-82. [DOI: 10.3168/jds.2014-8047] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Accepted: 05/20/2014] [Indexed: 11/19/2022]
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Maher AC, Mohsen AW, Vockley J, Tarnopolsky MA. Low expression of long-chain acyl-CoA dehydrogenase in human skeletal muscle. Mol Genet Metab 2010; 100:163-7. [PMID: 20363655 PMCID: PMC3974577 DOI: 10.1016/j.ymgme.2010.03.011] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2010] [Revised: 03/13/2010] [Accepted: 03/14/2010] [Indexed: 10/19/2022]
Abstract
PURPOSE Long-chain acyl-CoA dehydrogenase (LCAD) is a mitochondrial flavoenzyme thought to be one of the major enzymes responsible for the first step of long-chain fatty acid (LCFA) beta-oxidation. Surprisingly, recent studies have shown LCAD is hardly detectable in human tissues such as liver and heart. Skeletal muscle is the largest organ in the body in terms of mass, and accounts for the majority of LCFA oxidation, especially during exercise. The purpose of this study was to investigate the expression levels of LCAD in human skeletal muscle. METHODS Muscle biopsies were obtained from the vastus lateralis of healthy athletic men and women, and examined for mRNA abundance, protein content, and enzyme activity of LCAD. We compared LCAD content with that of very-long chain acyl-CoA dehydrogenase (VLCAD) and medium chain acyl-CoA dehydrogenase (MCAD); two mitochondrial beta-oxidation enzymes that have overlapping chain-length specificity to that of LCAD. LCAD protein content and enzyme activity were also examined in enriched mitochondrial protein fractions. As controls, LCAD presence in skeletal muscle was compared to human heart, liver, and mouse skeletal muscle. RESULTS The mRNA presence of LCAD in human skeletal muscle is significantly less than VLCAD and MCAD (0.08+/-0.01 vs 7.3+/-0.5 vs 2.4+/-0.2 respectively, P<or=0.0001). LCAD protein was undetectable in human muscle homogenates, and coordinately LCAD enzyme activity was undetectable in enriched mitochondrial samples. CONCLUSION LCAD is minimally expressed in human skeletal muscle and likely does not play a significant role in LCFA oxidation.
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Affiliation(s)
- Amy C. Maher
- Department of Medical Science, McMaster University, Hamilton, Ontario, Canada
| | - Al-Walid Mohsen
- Department of Pediatrics, University of Pittsburgh School of Medicine, Children’s Hospital of Pittsburgh, Pittsburgh, PA 15224, USA
| | - Jerry Vockley
- Department of Pediatrics, University of Pittsburgh School of Medicine, Children’s Hospital of Pittsburgh, Pittsburgh, PA 15224, USA
- Department of Human Genetics, University of Pittsburgh Graduate School of Public Health, Pittsburgh, PA 15213, USA
| | - Mark A. Tarnopolsky
- Department of Pediatrics and Medicine, McMaster University, Hamilton, Ontario, Canada
- Correspondence to: M.A. Tarnopolsky, Department of Pediatrics and Medicine, Division of Neurology, Room 2H26, McMaster University Medical Center, 1200 Main Street West, Hamilton, Ontario, Canada L8S 3Z5. Fax: +1 905 577 8380
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Chegary M, Brinke HT, Ruiter JPN, Wijburg FA, Stoll MSK, Minkler PE, van Weeghel M, Schulz H, Hoppel CL, Wanders RJA, Houten SM. Mitochondrial long chain fatty acid beta-oxidation in man and mouse. Biochim Biophys Acta Mol Cell Biol Lipids 2009; 1791:806-15. [PMID: 19465148 DOI: 10.1016/j.bbalip.2009.05.006] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2009] [Revised: 04/28/2009] [Accepted: 05/18/2009] [Indexed: 10/20/2022]
Abstract
Several mouse models for mitochondrial fatty acid beta-oxidation (FAO) defects have been developed. So far, these models have contributed little to our current understanding of the pathophysiology. The objective of this study was to explore differences between murine and human FAO. Using a combination of analytical, biochemical and molecular methods, we compared fibroblasts of long chain acyl-CoA dehydrogenase knockout (LCAD(-/-)), very long chain acyl-CoA dehydrogenase knockout (VLCAD(-/-)) and wild type mice with fibroblasts of VLCAD-deficient patients and human controls. We show that in mice, LCAD and VLCAD have overlapping and distinct roles in FAO. The absence of VLCAD is apparently fully compensated, whereas LCAD deficiency is not. LCAD plays an essential role in the oxidation of unsaturated fatty acids such as oleic acid, but seems redundant in the oxidation of saturated fatty acids. In strong contrast, LCAD is neither detectable at the mRNA level nor at the protein level in men, making VLCAD indispensable in FAO. Our findings open new avenues to employ the existing mouse models to study the pathophysiology of human FAO defects.
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Affiliation(s)
- Malika Chegary
- Department of Clinical Chemistry, Emma Children's Hospital, Academic Medical Center, University of Amsterdam, The Netherlands
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Kim JW, Zhao SH, Uthe JJ, Bearson SMD, Tuggle CK. Physical mapping of eight pig genes whose expression level is acutely affected by Salmonella challenge. Anim Genet 2005; 36:359-62. [PMID: 16026354 DOI: 10.1111/j.1365-2052.2005.01309.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- J W Kim
- Department of Animal Science, Iowa State University, Ames, IA, USA
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Lund RJ, Chen Z, Scheinin J, Lahesmaa R. Early Target Genes of IL-12 and STAT4 Signaling in Th Cells. THE JOURNAL OF IMMUNOLOGY 2004; 172:6775-82. [PMID: 15153495 DOI: 10.4049/jimmunol.172.11.6775] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
IL-12 signaling through STAT4 is essential for induction of optimal levels of IFN-gamma production and commitment of Th1 cells. The molecular mechanism that controls how IL-12 and STAT4 signaling induces Th1 differentiation is poorly described. To identify the early target genes of IL-12 and STAT4 signaling, oligonucleotide arrays were used to compare the gene expression profiles of wild-type and STAT4-knockout murine Th cells during the early Th1 differentiation. According to the results, 20 genes were regulated in an IL-12- and STAT4-dependent manner. Importantly, Ifngamma was clearly the first gene induced by IL-12 in a STAT4-dependent manner. Most of the other defects in gene expression in STAT4-knockout cells were seen after 48 h of Th1 polarization. In addition to IL-12 signaling mediated by STAT4, STAT4-independent induction of a number of genes was observed immediately in response to Th1 induction. This induction was at least in part driven by IFN-gamma independently of STAT4. Importantly, addition of exogenous IFN-gamma into Th1 cell cultures of STAT4-knockout cells restored the defect in IFN-gamma production further demonstrating the critical role of IFN-gamma in early Th1 differentiation.
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Affiliation(s)
- Riikka J Lund
- Turku Centre for Biotechnology, Turku University and Abo Akademi, Turku Graduate School of Biomedical Sciences, Turku University, Turku, Finland.
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Bauer M, Hamm AC, Bonaus M, Jacob A, Jaekel J, Schorle H, Pankratz MJ, Katzenberger JD. Starvation response in mouse liver shows strong correlation with life-span-prolonging processes. Physiol Genomics 2004; 17:230-44. [PMID: 14762175 DOI: 10.1152/physiolgenomics.00203.2003] [Citation(s) in RCA: 123] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
We have monitored global changes in gene expression in mouse liver in response to fasting and sugar-fed conditions using high-density microarrays. From ∼20,000 different genes, the significantly regulated ones were grouped into specific signaling and metabolic pathways. Striking changes in lipid signaling cascade, insulin and dehydroepiandrosterone (DHEA) hormonal pathways, urea cycle and S-adenosylmethionine-based methyl transfer systems, and cell apoptosis regulators were observed. Since these pathways have been implicated to play a role in the aging process, and since we observe significant overlap of genes regulated upon starvation with those regulated upon caloric restriction, our analysis suggests that starvation may elicit a stress response that is also elicited during caloric restriction. Therefore, many of the signaling and metabolic components regulated during fasting may be the same as those which mediate caloric restriction-dependent life-span extension.
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Affiliation(s)
- Matthias Bauer
- Institut fuer Genetik, Forschungszentrum Karlsruhe, 76021 Karlsruhe, , Germany
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Abstract
Mitochondrial beta-oxidation of fatty acids is vital for energy production in periods of fasting and other metabolic stress. Human patients have been identified with inherited disorders of mitochondrial beta-oxidation of fatty acids with enzyme deficiencies identified at many of the steps in this pathway. Although these patients exhibit a range of disease processes, Reye-like illness (hypoketotic-hypoglycemia, hyperammonemia and fatty liver) and cardiomyopathy are common findings. There have been several mouse models developed to aid in the study of these disease conditions. The characterized mouse models include inherited deficiencies of very long-chain acyl-CoA dehydrogenase, long-chain acyl-CoA dehydrogenase, short-chain acyl-CoA dehydrogenase, mitochondrial trifunctional protein-alpha, and medium-/short-chain hydroxyacyl-CoA dehydrogenase. Mouse mutants developed, but presently incompletely characterized as models, include carnitine palmitoyltransferase-1a and medium-chain acyl-CoA dehydrogenase deficiencies. In general, the mouse models of disorders of mitochondrial fatty acid beta-oxidation have shown clinical signs that include Reye-like syndrome and cardiomyopathy, and many are cold intolerant. It is expected that these mouse models will provide vital contributions in understanding the mechanisms of disease pathogenesis of fatty acid oxidation disorders and the development of appropriate treatments and supportive care.
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Affiliation(s)
- A Michele Schuler
- Department of Genomics and Pathobiology, School of Medicine, University of Alabama at Birmingham, AL, USA
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Abstract
Mitochondrial beta-oxidation of fatty acids generates energy by direct electron transfer at the dehydrogenase steps along with the ultimate product of acetyl-coenzyme A that can be further oxidized for ATP synthesis, or conversion to ketone bodies. This review describes the human inborn errors of this pathway and recent results concerning the development and use of mouse models of these inherited enzyme deficiencies.
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Affiliation(s)
- P A Wood
- Department of Comparative Medicine, School of Medicine, University of Alabama at Birmingham 35294-0019, USA
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Kurtz DM, Rinaldo P, Rhead WJ, Tian L, Millington DS, Vockley J, Hamm DA, Brix AE, Lindsey JR, Pinkert CA, O'Brien WE, Wood PA. Targeted disruption of mouse long-chain acyl-CoA dehydrogenase gene reveals crucial roles for fatty acid oxidation. Proc Natl Acad Sci U S A 1998; 95:15592-7. [PMID: 9861014 PMCID: PMC28088 DOI: 10.1073/pnas.95.26.15592] [Citation(s) in RCA: 169] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/1998] [Indexed: 11/18/2022] Open
Abstract
Abnormalities of fatty acid metabolism are recognized to play a significant role in human disease, but the mechanisms remain poorly understood. Long-chain acyl-CoA dehydrogenase (LCAD) catalyzes the initial step in mitochondrial fatty acid oxidation (FAO). We produced a mouse model of LCAD deficiency with severely impaired FAO. Matings between LCAD +/- mice yielded an abnormally low number of LCAD +/- and -/- offspring, indicating frequent gestational loss. LCAD -/- mice that reached birth appeared normal, but had severely reduced fasting tolerance with hepatic and cardiac lipidosis, hypoglycemia, elevated serum free fatty acids, and nonketotic dicarboxylic aciduria. Approximately 10% of adult LCAD -/- males developed cardiomyopathy, and sudden death was observed in 4 of 75 LCAD -/- mice. These results demonstrate the crucial roles of mitochondrial FAO and LCAD in vivo.
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MESH Headings
- Acyl-CoA Dehydrogenase, Long-Chain/deficiency
- Acyl-CoA Dehydrogenase, Long-Chain/genetics
- Acyl-CoA Dehydrogenase, Long-Chain/metabolism
- Animals
- Disease Models, Animal
- Fatty Acids, Nonesterified/blood
- Fatty Acids, Nonesterified/metabolism
- Humans
- Lipid Metabolism, Inborn Errors/enzymology
- Lipid Metabolism, Inborn Errors/genetics
- Lipid Metabolism, Inborn Errors/pathology
- Liver/metabolism
- Liver/pathology
- Mice
- Mice, Knockout
- Mitochondria, Liver/enzymology
- Muscle, Skeletal/metabolism
- Substrate Specificity
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Affiliation(s)
- D M Kurtz
- Department of Comparative Medicine, Schools of Medicine and Dentistry, University of Alabama, Birmingham, AL 35294, USA
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