{
"METABOLOMICS WORKBENCH":{"STUDY_ID":"ST002774","ANALYSIS_ID":"AN004515","VERSION":"1","CREATED_ON":"09-19-2023"},

"PROJECT":{"PROJECT_TITLE":"Defective Branched-Chain Amino Acid Catabolism in Dorsal Root Ganglia Contributes to Mechanical Pain","PROJECT_SUMMARY":"Impaired branched-chain amino acid (BCAA) catabolism has recently been implicated in the development of mechanical pain, but the molecular mechanisms are unclear. Here we report that defective BCAA catabolism in dorsal root ganglia (DRG) neurons sensitizes mice to mechanical pain by increasing lactate production and Piezo2 expression, a mechanotransduction channel. In high-fat diet fed obese mice, we observed a downregulation of PP2Cm, a key regulator in BCAA catabolic pathway, in DRG neurons. Mice with conditional knockout of PP2Cm in DRG neurons (cKO) exhibited mechanical allodynia under normal or spare nerve injury (SNI)-induced neuropathic injury conditions. Further, in patients with peripheral neuropathic pain, we found that the Visual Analogue Scale (VAS) scores were positively correlated with BCAA contents in plasma, highlighting a link between peripheral neuropathic pain and dysregulated BCAA catabolism. Mechanistically, defective BCAA catabolism promotes the production of lactate through glycolysis in DRG neurons, which increases H3K18la modification and drives Piezo2 expression. Inhibition of lactate production or silencing of Piezo2 expression attenuated the pain phenotype of cKO to mechanical stimuli. Therefore, our study demonstrates a casual role of defective BCAA catabolism in mechanical pain by enhancing metabolite-mediated epigenetic regulation.","INSTITUTE":"West China Hospital of Sichuan University","LABORATORY":"Laboratory of Mitochondria and Metabolism","LAST_NAME":"Li","FIRST_NAME":"Tao","ADDRESS":"No. 37 Guoxue Road, Wuhou District, Chendu 610041, Sichuan, China","EMAIL":"563234879@qq.com","PHONE":"+8628-85164154","DOI":"http://dx.doi.org/10.21228/M8ZD8R"},

"STUDY":{"STUDY_TITLE":"Metabolomics studies on L4-5 Dorsal Root Ganglia of Ctrl and cKO mice","STUDY_SUMMARY":"Metabolomics studies on Dorsal Root Ganglia (DRGs) (Ctrl and cKO).The specific knockout of PP2Cm in the DRG was achieved by intracellular injection of AAV9-Pirt-Cre (1.0×1013 vg/ml) or AAV9-Pirt (1.0×1013 vg/ml)) as control. Mice were used for experiments at 4 weeks after the injection.","INSTITUTE":"West China Hospital of Sichuan University","LAST_NAME":"Li","FIRST_NAME":"Tao","ADDRESS":"No. 37 Guoxue Road, Wuhou District, Chendu 610041, Sichuan, China","EMAIL":"563234879@qq.com","PHONE":"+8628-85164154","SUBMIT_DATE":"2023-07-07"},

"SUBJECT":{"SUBJECT_TYPE":"Mammal","SUBJECT_SPECIES":"Mus musculus","TAXONOMY_ID":"10090"},
"SUBJECT_SAMPLE_FACTORS":[
{
"Subject ID":"cKO1",
"Sample ID":"cKO1",
"Factors":{"Genotype":"cKO"},
"Additional sample data":{"RAW_FILE_NAME":"XHJ_DRG NEG/POS-20221214-XHJ_DRG_aqu_KO1.mzML"}
},
{
"Subject ID":"cKO2",
"Sample ID":"cKO2",
"Factors":{"Genotype":"cKO"},
"Additional sample data":{"RAW_FILE_NAME":"XHJ_DRG NEG/POS-20221214-XHJ_DRG_aqu_KO2.mzML"}
},
{
"Subject ID":"cKO3",
"Sample ID":"cKO3",
"Factors":{"Genotype":"cKO"},
"Additional sample data":{"RAW_FILE_NAME":"XHJ_DRG NEG/POS-20221214-XHJ_DRG_aqu_KO3.mzML"}
},
{
"Subject ID":"cKO4",
"Sample ID":"cKO4",
"Factors":{"Genotype":"cKO"},
"Additional sample data":{"RAW_FILE_NAME":"XHJ_DRG NEG/POS-20221214-XHJ_DRG_aqu_KO4.mzML"}
},
{
"Subject ID":"cKO5",
"Sample ID":"cKO5",
"Factors":{"Genotype":"cKO"},
"Additional sample data":{"RAW_FILE_NAME":"XHJ_DRG NEG/POS-20221214-XHJ_DRG_aqu_KO5.mzML"}
},
{
"Subject ID":"cKO6",
"Sample ID":"cKO6",
"Factors":{"Genotype":"cKO"},
"Additional sample data":{"RAW_FILE_NAME":"XHJ_DRG NEG/POS-20221214-XHJ_DRG_aqu_KO6.mzML"}
},
{
"Subject ID":"Ctrl1",
"Sample ID":"Ctrl1",
"Factors":{"Genotype":"Ctrl"},
"Additional sample data":{"RAW_FILE_NAME":"XHJ_DRG NEG/POS-20221214-XHJ_DRG_aqu_C1.mzML"}
},
{
"Subject ID":"Ctrl2",
"Sample ID":"Ctrl2",
"Factors":{"Genotype":"Ctrl"},
"Additional sample data":{"RAW_FILE_NAME":"XHJ_DRG NEG/POS-20221214-XHJ_DRG_aqu_C2.mzML"}
},
{
"Subject ID":"Ctrl3",
"Sample ID":"Ctrl3",
"Factors":{"Genotype":"Ctrl"},
"Additional sample data":{"RAW_FILE_NAME":"XHJ_DRG NEG/POS-20221214-XHJ_DRG_aqu_C3.mzML"}
},
{
"Subject ID":"Ctrl4",
"Sample ID":"Ctrl4",
"Factors":{"Genotype":"Ctrl"},
"Additional sample data":{"RAW_FILE_NAME":"XHJ_DRG NEG/POS-20221214-XHJ_DRG_aqu_C4.mzML"}
},
{
"Subject ID":"Ctrl5",
"Sample ID":"Ctrl5",
"Factors":{"Genotype":"Ctrl"},
"Additional sample data":{"RAW_FILE_NAME":"XHJ_DRG NEG/POS-20221214-XHJ_DRG_aqu_C5.mzML"}
},
{
"Subject ID":"Ctrl6",
"Sample ID":"Ctrl6",
"Factors":{"Genotype":"Ctrl"},
"Additional sample data":{"RAW_FILE_NAME":"XHJ_DRG NEG/POS-20221214-XHJ_DRG_aqu_C6.mzML"}
}
],
"COLLECTION":{"COLLECTION_SUMMARY":"Mice were anaesthetized with volatile anesthetic isoflurane (3-4% for induction, 1-2% for maintenance, in O2≈ 2 L/min). DRG (left L4–L5) were surgically exposed and diessected. Fresh DRG samples were frozen in liquid nitrogen.5-6 DRGs were collected as one sample","SAMPLE_TYPE":"DRG"},

"TREATMENT":{"TREATMENT_SUMMARY":"No treatment."},

"SAMPLEPREP":{"SAMPLEPREP_SUMMARY":"Fresh tissue samples were frozen in liquid nitrogen. After thawing on ice, 10 mg tissue was homogenized in -80°C precooled labeled-solution (MeOH: H2O=4:1, v/v) for 30 s, 4 cycles, and placed at -80°C for 30 minutes. In ice water bath, ultrasonic wave was used for 10 min and centrifuged at 14000 rpm. The precipitated protein was dissolved in no labeled-liquid (MeOH: H2O=4:1), vortexed and centrifuged. After derivatization with N-methyl-N-(trimethylsilyl)tri-fluoroacetamide for 30 min, the supernatant was detected by GC-MS. Metabolites were identified by means of KEGG Metabolic pathways."},

"CHROMATOGRAPHY":{"INSTRUMENT_NAME":"Nexera UHPLC LC-30A ","COLUMN_NAME":"Waters BEH Amide (2.1 X 100mm, 1.7μm)","COLUMN_TEMPERATURE":"40℃","FLOW_GRADIENT":"0～1.5min,90%B.1.5~5min,90-45%B.5~10min,45%B.10~11min,45~90B.11~23min,90B","FLOW_RATE":"0.3ml/min","SOLVENT_A":"10% acetonitrile/90% water; 0.2% acetic acid","SOLVENT_B":"90% acetonitrile/10% water; 0.2% acetic acic","CHROMATOGRAPHY_TYPE":"HILIC"},

"ANALYSIS":{"ANALYSIS_TYPE":"MS"},

"MS":{"INSTRUMENT_NAME":"Nexera UHPLC LC-30A ","INSTRUMENT_TYPE":"Triple quadrupole","MS_TYPE":"ESI","MS_COMMENTS":"-","ION_MODE":"POSITIVE"},

"MS_METABOLITE_DATA":{
"Units":"pmoles/l",

"Data":[{"Metabolite":"1-Methylhistamine","cKO1":"","cKO2":"3236.0000","cKO3":"","cKO4":"","cKO5":"3033.7500","cKO6":"3032.7500","Ctrl1":"3842.1250","Ctrl2":"2425.6250","Ctrl3":"","Ctrl4":"","Ctrl5":"","Ctrl6":""},{"Metabolite":"3-Nitrotyrosine","cKO1":"","cKO2":"","cKO3":"","cKO4":"","cKO5":"","cKO6":"","Ctrl1":"","Ctrl2":"","Ctrl3":"","Ctrl4":"","Ctrl5":"","Ctrl6":""},{"Metabolite":"4-Hydroxyphenylpyruvic acid","cKO1":"","cKO2":"","cKO3":"","cKO4":"12125.3750","cKO5":"","cKO6":"","Ctrl1":"","Ctrl2":"","Ctrl3":"","Ctrl4":"","Ctrl5":"","Ctrl6":""},{"Metabolite":"4-Pyridoxic 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