Journal: Molecular Medicine
Article Title: Progressive endocannabinoid system dysregulation in autosomal dominant polycystic kidney disease
doi: 10.1186/s10020-026-01457-w
Figure Lengend Snippet: ECS components are progressively dysregulated in human ADPKD kidney tissue. a Microarray analysis ( GSE7869 ) of human kidney tissue shows stepwise increases in CNR1 transcript from healthy cortex to minimally cystic (PKDm) and fully cystic (PKD) ADPKD tissue, with corresponding reductions in AEA-metabolizing enzymes NAPEPLD and FAAH . b Single-nucleus RNA-sequencing (snRNA-seq) analysis of human ADPKD kidneys ( n = 8) versus healthy controls ( n = 5) demonstrate consistent CNR1 upregulation and marked downregulation of NAPEPLD and FAAH , while 2-AG-metabolizing enzymes remain largely unchanged. c snRNA-seq analysis of diabetic kidney disease (DKD; n = 5 patients; controls n = 6) reveals minimal alterations in CNR1 and ECS-metabolizing enzymes. d Gene expression analysis by qPCR confirms CNR1 upregulation in human ADPKD kidney tissue ( n = 17) versus non-cystic nephrectomy controls ( n = 5), with concurrent changes in ECS enzyme transcription. e-i eCB quantification by liquid chromatography-tandem mass spectrometry (LC–MS/MS) reveals significant depletion of tissue anandamide (AEA); e , N -oleoylethanolamine (OEA); f , 2-arachidonoylglycerol (2-AG); h , and arachidonic acid (AA); i , while N -palmitoylethanolamine (PEA); g remains unchanged. j-l Western blot analysis shows substantial inter-individual variability in CB 1 R protein levels without significant difference between ADPKD ( n = 6) and control kidneys ( n = 4), but significant reductions in DAGLα/β, NAPEPLD, MGLL and FAAH protein. Western blots were normalized to total proteins. Data represent mean ± SEM. Statistics of control versus PKD represented by * and control versus PKDm by #. Statistical significance assessed by Mann–Whitney U test or unpaired t -test: * p < 0.05, ** p < 0.01, *** p < 0.001, **** p < 0.0001
Article Snippet: Sections were stained with rabbit anti-CB 1 R antibody (1:200, 10006590, Cayman) followed by a goat anti-rabbit HRP conjugate (ImmPRESSTM, Vector laboratories).
Techniques: Microarray, RNA Sequencing, Gene Expression, Liquid Chromatography, Mass Spectrometry, Liquid Chromatography with Mass Spectroscopy, Western Blot, Control, MANN-WHITNEY