1 3466 106 HYPOXIA AS A KEY PLAYER IN THE AKI-TO-CKD TRANSITION. RECENT CLINICAL AND ANIMAL STUDIES HAVE SHOWN THAT ACUTE KIDNEY INJURY (AKI), EVEN IF FOLLOWED BY COMPLETE RECOVERY OF RENAL FUNCTION, CAN EVENTUALLY RESULT IN CHRONIC KIDNEY DISEASE (CKD). RENAL HYPOXIA IS EMERGING AS A KEY PLAYER IN THE PATHOPHYSIOLOGY OF THE AKI-TO-CKD TRANSITION. CAPILLARY RAREFACTION AFTER AKI EPISODES INDUCES RENAL HYPOXIA, WHICH CAN IN TURN PROFOUNDLY AFFECT TUBULAR EPITHELIAL CELLS, (MYO)FIBROBLASTS, AND INFLAMMATORY CELLS, CULMINATING IN TUBULOINTERSTITIAL FIBROSIS, I.E., PROGRESSION TO CKD. DAMAGED TUBULAR EPITHELIAL CELLS THAT FAIL TO REDIFFERENTIATE MIGHT SUPPLY A DECREASED AMOUNT OF VASCULAR ENDOTHELIAL GROWTH FACTOR AND CONTRIBUTE TO CAPILLARY RAREFACTION, THUS AGGRAVATING HYPOXIA AND FORMING A VICIOUS CYCLE. MOUNTING EVIDENCE ALSO SHOWS THAT EPIGENETIC CHANGES ARE CLOSELY RELATED TO RENAL HYPOXIA IN THE PATHOPHYSIOLOGY OF CKD PROGRESSION. ANIMAL EXPERIMENTS SUGGEST THAT TARGETING HYPOXIA IS A PROMISING STRATEGY TO BLOCK THE TRANSITION FROM AKI TO CKD. HOWEVER, THE PRECISE MECHANISMS BY WHICH HYPOXIA INDUCES THE AKI-TO-CKD TRANSITION AND BY WHICH HYPOXIA-INDUCIBLE FACTOR ACTIVATION CAN EXERT A PROTECTIVE EFFECT IN THIS CONTEXT SHOULD BE CLARIFIED IN FURTHER STUDIES. 2014 2 2034 54 EPIGENETIC CHANGES IN THE ACUTE KIDNEY INJURY-TO-CHRONIC KIDNEY DISEASE TRANSITION. PREVIOUSLY ACUTE KIDNEY INJURY (AKI) HAD BEEN BELIEVED TO BE A TRANSIENT EVENT, AND RECOVERY FROM AKI HAD BEEN THOUGHT TO LEAD TO NO CONSEQUENCES. HOWEVER, RECENT EPIDEMIOLOGICAL STUDIES HAVE SHOWN THAT EVEN IF THERE IS COMPLETE RECOVERY OF THE KIDNEY FUNCTION, AKI CAN EVENTUALLY RESULT IN CHRONIC KIDNEY DISEASE (CKD) AND EVENTUALLY IN END-STAGE KIDNEY DISEASE IN THE LONG TERM. TRANSITION OF AKI TO CKD IS MEDIATED BY MULTIPLE MECHANISMS, INCLUDING ABERRANT CELL CYCLE ARREST AND HYPOXIA. HYPOXIA OF THE KIDNEY IS INDUCED BY RAREFACTION OF THE PERITUBULAR CAPILLARIES AFTER AKI EPISODES, AND INDUCES INFLAMMATION AND FIBROSIS. IT SHOULD ALSO BE NOTED THAT EPIGENETIC CHANGES ARE CLOSELY RELATED TO HYPOXIA, AND EPIGENETIC CHANGES INDUCED BY HYPOXIA, CALLED "HYPOXIC MEMORY" CAN EXPLAIN THE AKI-TO-CKD TRANSITION IN THE LONG TERM AFTER COMPLETE RECOVERY FROM THE INITIAL AKI EPISODE. TARGETING HYPOXIA AND SUBSEQUENT EPIGENETIC CHANGES ARE PROMISING STRATEGIES TO BLOCK THE TRANSITION FROM AKI TO CKD. 2017 3 4513 29 MULTI-OMIC APPROACHES TO ACUTE KIDNEY INJURY AND REPAIR. THE KIDNEY HAS A REMARKABLE REGENERATIVE CAPACITY. IN RESPONSE TO ISCHEMIC OR TOXIC INJURY, PROXIMAL TUBULE CELLS CAN PROLIFERATE TO REBUILD DAMAGED TUBULES AND RESTORE KIDNEY FUNCTION. HOWEVER, SEVERE ACUTE KIDNEY INJURY (AKI) OR RECURRENT AKI EVENTS CAN LEAD TO MALADAPTIVE REPAIR AND DISEASE PROGRESSION FROM AKI TO CHRONIC KIDNEY DISEASE (CKD). THE APPLICATION OF SINGLE CELL TECHNOLOGIES HAS IDENTIFIED INJURED PROXIMAL TUBULE CELL STATES WEEKS AFTER AKI, DISTINGUISHED BY A PRO-INFLAMMATORY SENESCENT MOLECULAR SIGNATURE. EPIGENETIC STUDIES HIGHLIGHTED DYNAMIC CHANGES IN THE CHROMATIN LANDSCAPE OF THE KIDNEY FOLLOWING AKI AND DESCRIBED KEY TRANSCRIPTION FACTORS LINKED TO THE AKI RESPONSE. THE INTEGRATION OF MULTI-OMIC TECHNOLOGIES OPENS NEW POSSIBILITIES TO IMPROVE OUR UNDERSTANDING OF AKI AND THE DRIVING FORCES BEHIND THE AKI-TO-CKD TRANSITION, WITH THE ULTIMATE GOAL OF DESIGNING TAILORED DIAGNOSTIC AND THERAPEUTIC STRATEGIES TO IMPROVE AKI OUTCOMES AND PREVENT KIDNEY DISEASE PROGRESSION. 2021 4 4381 46 MITOCHONDRIAL DYSFUNCTION AND THE AKI-TO-CKD TRANSITION. ACUTE KIDNEY INJURY (AKI) HAS BEEN WIDELY RECOGNIZED AS AN IMPORTANT RISK FACTOR FOR THE OCCURRENCE AND DEVELOPMENT OF CHRONIC KIDNEY DISEASE (CKD). EVEN MILDER AKI HAS ADVERSE CONSEQUENCES AND COULD PROGRESS TO RENAL FIBROSIS, WHICH IS THE ULTIMATE COMMON PATHWAY FOR VARIOUS TERMINAL KIDNEY DISEASES. THUS, IT IS URGENT TO DEVELOP A STRATEGY TO HINDER THE TRANSITION FROM AKI TO CKD. SOME MECHANISMS OF THE AKI-TO-CKD TRANSITION HAVE BEEN REVEALED, SUCH AS NEPHRON LOSS, CELL CYCLE ARREST, PERSISTENT INFLAMMATION, ENDOTHELIAL INJURY WITH VASCULAR RAREFACTION, AND EPIGENETIC CHANGES. PREVIOUS STUDIES HAVE ELUCIDATED THE PIVOTAL ROLE OF MITOCHONDRIA IN ACUTE INJURIES AND DEMONSTRATED THAT THE FITNESS OF THIS ORGANELLE IS A MAJOR DETERMINANT IN BOTH THE PATHOGENESIS AND RECOVERY OF ORGAN FUNCTION. RECENT RESEARCH HAS SUGGESTED THAT DAMAGE TO MITOCHONDRIAL FUNCTION IN EARLY AKI IS A CRUCIAL FACTOR LEADING TO TUBULAR INJURY AND PERSISTENT RENAL INSUFFICIENCY. DYSREGULATION OF MITOCHONDRIAL HOMEOSTASIS, ALTERATIONS IN BIOENERGETICS, AND ORGANELLE STRESS CROSS TALK CONTRIBUTE TO THE AKI-TO-CKD TRANSITION. IN THIS REVIEW, WE FOCUS ON THE PATHOPHYSIOLOGY OF MITOCHONDRIA IN RENAL RECOVERY AFTER AKI AND PROGRESSION TO CKD, CONFIRMING THAT TARGETING MITOCHONDRIA REPRESENTS A POTENTIALLY EFFECTIVE THERAPEUTIC STRATEGY FOR THE PROGRESSION OF AKI TO CKD. 2020 5 5363 25 RECENT ADVANCES IN DIABETIC KIDNEY DISEASES: FROM KIDNEY INJURY TO KIDNEY FIBROSIS. DIABETIC KIDNEY DISEASE (DKD) IS THE LEADING CAUSE OF CHRONIC KIDNEY DISEASE AND END-STAGE RENAL DISEASE. THE NATURAL HISTORY OF DKD INCLUDES GLOMERULAR HYPERFILTRATION, PROGRESSIVE ALBUMINURIA, DECLINING ESTIMATED GLOMERULAR FILTRATION RATE, AND, ULTIMATELY, KIDNEY FAILURE. IT IS KNOWN THAT DKD IS ASSOCIATED WITH METABOLIC CHANGES CAUSED BY HYPERGLYCEMIA, RESULTING IN GLOMERULAR HYPERTROPHY, GLOMERULOSCLEROSIS, AND TUBULOINTERSTITIAL INFLAMMATION AND FIBROSIS. HYPERGLYCEMIA IS ALSO KNOWN TO CAUSE PROGRAMMED EPIGENETIC MODIFICATION. HOWEVER, THE DETAILED MECHANISMS INVOLVED IN THE ONSET AND PROGRESSION OF DKD REMAIN ELUSIVE. IN THIS REVIEW, WE DISCUSS RECENT ADVANCES REGARDING THE PATHOGENIC MECHANISMS INVOLVED IN DKD. 2021 6 5370 27 RECENT ADVANCES IN UNDERSTANDING OF CHRONIC KIDNEY DISEASE. CHRONIC KIDNEY DISEASE (CKD) IS DEFINED AS ANY CONDITION THAT CAUSES REDUCED KIDNEY FUNCTION OVER A PERIOD OF TIME. FIBROSIS, TUBULAR ATROPHY AND INTERSTITIAL INFLAMMATION ARE THE HALLMARK OF PATHOLOGICAL FEATURES IN CKD. REGARDLESS OF INITIAL INSULT, CKD HAS SOME COMMON PATHWAYS LEADING CKD TO END-STAGE KIDNEY DISEASE, INCLUDING HYPOXIA IN THE TUBULOINTERSTITIUM AND PROTEINURIA. RECENT ADVANCES IN GENOME EDITING TECHNOLOGIES AND STEM CELL RESEARCH GIVE GREAT INSIGHTS TO UNDERSTAND THE PATHOGENESIS OF CKD, INCLUDING IDENTIFICATIONS OF THE ORIGINS OF RENAL MYOFIBROBLASTS AND TUBULAR EPITHELIAL CELLS UPON INJURY. ENVIRONMENTAL FACTORS SUCH AS HYPOXIA, OXIDATIVE STRESS, AND EPIGENETIC FACTORS IN RELATION TO CKD ARE ALSO DISCUSSED. 2015 7 5420 36 REGULATION OF HYPOXIA-INDUCIBLE FACTOR IN KIDNEY DISEASE. HYPOXIA PLAYS A CRUCIAL ROLE IN THE PATHOPHYSIOLOGY OF ACUTE KIDNEY INJURY (AKI) AND PRESUMABLY ALSO CHRONIC KIDNEY DISEASE (CKD). HYPOXIA-INDUCIBLE FACTOR (HIF) IS THE MASTER TRANSCRIPTION FACTOR THAT REGULATES ADAPTIVE RESPONSES AGAINST HYPOXIA. UNDER HYPOXIC CONDITIONS, HIF ACTIVATES TARGET GENES WITH HYPOXIA-RESPONSIVE ELEMENTS IN THEIR REGULATORY REGIONS. THE HIF ISOFORMS AND REGULATORS OF HIF (I.E. PROLYL HYDROXYLASES) SHOW CELL TYPE-SPECIFIC DISTRIBUTIONS. HYPOXIA IS OBSERVED IN BOTH ISCHAEMIC AND SO-CALLED NON-ISCHAEMIC FORMS OF AKI. IN ADDITION TO THE ACUTE PHASE, HYPOXIA MAY ENSUE DURING THE RECOVERY PHASE OF AKI, POSSIBLY DUE TO THE OXYGEN-CONSUMING PROCESSES OF CELL GROWTH AND PROLIFERATION FOR REPAIR. ALTHOUGH HIF PROTECTS THE KIDNEY AGAINST AKI, INTRINSIC HIF ACTIVATION IS SUBMAXIMAL IN AKI AND FURTHER AUGMENTATION OF HIF AMELIORATES DISEASE MANIFESTATIONS. THE KIDNEY IN CKD ALSO SUFFERS FROM HYPOXIA CAUSED BY MULTIPLE MECHANISMS, INCLUDING SUSTAINED OXYGEN DEMANDS IN THE REMAINING NEPHRONS DUE TO MALADAPTIVE TUBULOGLOMERULAR FEEDBACK. WHETHER HIF IS CHRONICALLY UPREGULATED IN CKD IS CONTENTIOUS. HYPOXIA-INDUCIBLE FACTOR ACTIVATION IS A PROMISING THERAPEUTIC APPROACH TO CKD, BUT EXCESSIVE ACTIVATION OF HIF MAY BE DELETERIOUS. IT IS LIKELY THAT THERE IS A THERAPEUTIC WINDOW OF HIF ACTIVATION IN CHRONIC CONDITIONS. UNDER CERTAIN CIRCUMSTANCES, ANIMALS WITH CKD ARE PROTECTED AGAINST AKI AND THIS MAY BE EXPLAINED BY NON-PHYSIOLOGICAL HYPOXIA OF THE KIDNEY AND SUBSEQUENT HIF EXPRESSION. IN ADDITION, AN ACUTE HYPOXIC INSULT MAY INDUCE LONG-LASTING CHANGES, POSSIBLY INCLUDING EPIGENETIC MODIFICATIONS INDUCED BY HIF. THESE OBSERVATIONS SUGGEST A COMPLEX INTERACTION BETWEEN AKI AND CKD VIA HYPOXIA AND HIF ACTIVATION. 2013 8 4016 29 LOW-DOSE HYDRALAZINE PREVENTS FIBROSIS IN A MURINE MODEL OF ACUTE KIDNEY INJURY-TO-CHRONIC KIDNEY DISEASE PROGRESSION. ACUTE KIDNEY INJURY (AKI) AND PROGRESSIVE CHRONIC KIDNEY DISEASE (CKD) ARE INTRINSICALLY TIED SYNDROMES. IN THIS REGARD, THE ACUTELY INJURED KIDNEY OFTEN DOES NOT ACHIEVE ITS FULL REGENERATIVE CAPACITY AND AKI DIRECTLY TRANSITIONS INTO PROGRESSIVE CKD ASSOCIATED WITH TUBULOINTERSTITIAL FIBROSIS. UNDERLYING MECHANISMS OF SUCH AKI-TO-CKD PROGRESSION ARE STILL INCOMPLETELY UNDERSTOOD AND SPECIFIC THERAPEUTIC INTERVENTIONS ARE STILL ELUSIVE. BECAUSE EPIGENETIC MODIFICATIONS PLAY A ROLE IN MAINTAINING TISSUE FIBROSIS, WE USED A MURINE MODEL OF ISCHEMIA-REPERFUSION INJURY TO DETERMINE WHETHER ABERRANT PROMOTER METHYLATION OF RASAL1 CONTRIBUTES CAUSALLY TO THE SWITCH BETWEEN PHYSIOLOGICAL REGENERATION AND TUBULOINTERSTITIAL FIBROGENESIS, A HALLMARK OF AKI-TO-CKD PROGRESSION. IT IS KNOWN THAT THE ANTIHYPERTENSIVE DRUG HYDRALAZINE HAS DEMETHYLATING ACTIVITY, AND THAT ITS OPTIMUM DEMETHYLATING ACTIVITY OCCURS AT CONCENTRATIONS BELOW BLOOD PRESSURE-LOWERING DOSES. ADMINISTRATION OF LOW-DOSE HYDRALAZINE EFFECTIVELY INDUCED EXPRESSION OF HYDROXYLASE TET3, WHICH CATALYZED RASAL1 HYDROXYMETHYLATION AND SUBSEQUENT RASAL1 PROMOTER DEMETHYLATION. HYDRALAZINE-INDUCED CPG PROMOTER DEMETHYLATION SUBSEQUENTLY ATTENUATED RENAL FIBROSIS AND PRESERVED EXCRETORY RENAL FUNCTION INDEPENDENT OF ITS BLOOD PRESSURE-LOWERING EFFECTS. IN COMPARISON, RASAL1 DEMETHYLATION AND INHIBITION OF TUBULOINTERSTITIAL FIBROSIS WAS NOT DETECTED UPON ADMINISTRATION OF THE ANGIOTENSIN-CONVERTING ENZYME INHIBITOR RAMIPRIL IN THIS MODEL. THUS, RASAL1 PROMOTER METHYLATION AND SUBSEQUENT TRANSCRIPTIONAL RASAL1 SUPPRESSION PLAYS A CAUSAL ROLE IN AKI-TO-CKD PROGRESSION. 2017 9 1665 35 DOWNREGULATION OF KIDNEY PROTECTIVE FACTORS BY INFLAMMATION: ROLE OF TRANSCRIPTION FACTORS AND EPIGENETIC MECHANISMS. CHRONIC KIDNEY DISEASE (CKD) IS ASSOCIATED TO AN INCREASED RISK OF DEATH, CKD PROGRESSION, AND ACUTE KIDNEY INJURY (AKI) EVEN FROM EARLY STAGES, WHEN GLOMERULAR FILTRATION RATE (GFR) IS PRESERVED. THE LINK BETWEEN EARLY CKD AND THESE RISKS IS UNCLEAR, SINCE THERE IS NO ACCUMULATION OF UREMIC TOXINS. HOWEVER, PATHOLOGICAL ALBUMINURIA AND KIDNEY INFLAMMATION ARE FREQUENT FEATURES OF EARLY CKD, AND THE PRODUCTION OF KIDNEY PROTECTIVE FACTORS MAY BE DECREASED. INDEED, KLOTHO EXPRESSION IS ALREADY DECREASED IN CKD CATEGORY G1 (NORMAL GFR). KLOTHO HAS ANTI-AGING AND NEPHROPROTECTIVE PROPERTIES, AND DECREASED KLOTHO LEVELS MAY CONTRIBUTE TO INCREASE THE RISK OF DEATH, CKD PROGRESSION, AND AKI. IN THIS REVIEW, WE DISCUSS THE DOWNREGULATION BY MEDIATORS OF INFLAMMATION OF MOLECULES WITH SYSTEMIC AND/OR RENAL LOCAL PROTECTIVE FUNCTIONS, EXEMPLIFIED BY KLOTHO AND PEROXISOME PROLIFERATOR-ACTIVATED RECEPTOR GAMMA COACTIVATOR-1ALPHA (PGC-1ALPHA), A TRANSCRIPTION FACTOR THAT PROMOTES MITOCHONDRIAL BIOGENESIS. CYTOKINES SUCH AS TWEAK, TNF-ALPHA, OR TRANSFORMING GROWTH FACTOR -BETA1 PRODUCED LOCALLY DURING KIDNEY INJURY OR RELEASED FROM INFLAMMATORY SITES AT OTHER ORGANS MAY DECREASE KIDNEY EXPRESSION OF KLOTHO AND PGC-1ALPHA OR LEAD TO SUBOPTIMAL RECRUITMENT OF THESE NEPHROPROTECTIVE PROTEINS. TRANSCRIPTION FACTORS (E.G., SMAD3 AND NF-KAPPAB) AND EPIGENETIC MECHANISMS (E.G., HISTONE ACETYLATION OR METHYLATION) CONTRIBUTE TO DOWNREGULATE THE EXPRESSION OF KLOTHO AND/OR PGC-1ALPHA, WHILE HISTONE CROTONYLATION PROMOTES PGC-1ALPHA EXPRESSION. NF-KAPPABIZ FACILITATES THE REPRESSIVE EFFECT OF NF-KAPPAB ON KLOTHO EXPRESSION. A DETAILED UNDERSTANDING OF THESE MEDIATORS MAY CONTRIBUTE TO THE DEVELOPMENT OF NOVEL THERAPEUTIC APPROACHES TO PREVENT CKD PROGRESSION AND ITS NEGATIVE IMPACT ON MORTALITY AND AKI. 2016 10 3885 36 KIDNEY FIBROSIS: FROM MECHANISMS TO THERAPEUTIC MEDICINES. CHRONIC KIDNEY DISEASE (CKD) IS ESTIMATED TO AFFECT 10-14% OF GLOBAL POPULATION. KIDNEY FIBROSIS, CHARACTERIZED BY EXCESSIVE EXTRACELLULAR MATRIX DEPOSITION LEADING TO SCARRING, IS A HALLMARK MANIFESTATION IN DIFFERENT PROGRESSIVE CKD; HOWEVER, AT PRESENT NO ANTIFIBROTIC THERAPIES AGAINST CKD EXIST. KIDNEY FIBROSIS IS IDENTIFIED BY TUBULE ATROPHY, INTERSTITIAL CHRONIC INFLAMMATION AND FIBROGENESIS, GLOMERULOSCLEROSIS, AND VASCULAR RAREFACTION. FIBROTIC NICHE, WHERE ORGAN FIBROSIS INITIATES, IS A COMPLEX INTERPLAY BETWEEN INJURED PARENCHYMA (LIKE TUBULAR CELLS) AND MULTIPLE NON-PARENCHYMAL CELL LINEAGES (IMMUNE AND MESENCHYMAL CELLS) LOCATED SPATIALLY WITHIN SCARRING AREAS. ALTHOUGH THE MECHANISMS OF KIDNEY FIBROSIS ARE COMPLICATED DUE TO THE KINDS OF CELLS INVOLVED, WITH THE HELP OF SINGLE-CELL TECHNOLOGY, MANY KEY QUESTIONS HAVE BEEN EXPLORED, SUCH AS WHAT KIND OF RENAL TUBULES ARE PROFIBROTIC, WHERE MYOFIBROBLASTS ORIGINATE, WHICH IMMUNE CELLS ARE INVOLVED, AND HOW CELLS COMMUNICATE WITH EACH OTHER. IN ADDITION, GENETICS AND EPIGENETICS ARE DEEPER MECHANISMS THAT REGULATE KIDNEY FIBROSIS. AND THE REVERSIBLE NATURE OF EPIGENETIC CHANGES INCLUDING DNA METHYLATION, RNA INTERFERENCE, AND CHROMATIN REMODELING, GIVES AN OPPORTUNITY TO STOP OR REVERSE KIDNEY FIBROSIS BY THERAPEUTIC STRATEGIES. MORE MARKETED (E.G., RAS BLOCKAGE, SGLT2 INHIBITORS) HAVE BEEN DEVELOPED TO DELAY CKD PROGRESSION IN RECENT YEARS. FURTHERMORE, A BETTER UNDERSTANDING OF RENAL FIBROSIS IS ALSO FAVORED TO DISCOVER BIOMARKERS OF FIBROTIC INJURY. IN THE REVIEW, WE UPDATE RECENT ADVANCES IN THE MECHANISM OF RENAL FIBROSIS AND SUMMARIZE NOVEL BIOMARKERS AND ANTIFIBROTIC TREATMENT FOR CKD. 2023 11 2788 43 FACTORS AFFECTING THE TRANSITION OF ACUTE KIDNEY INJURY TO CHRONIC KIDNEY DISEASE: POTENTIAL MECHANISMS AND FUTURE PERSPECTIVES. ACUTE KIDNEY INJURY (AKI) IS DEFINED AS A RAPID LOSS OF KIDNEY FUNCTION CHARACTERISED BY INFLAMMATION AND CELL DEATH, ULTIMATELY LEADING TO FURTHER FUNCTIONAL AND STRUCTURAL RENAL ALTERATIONS. BASED ON EXPERIMENTAL AND EPIDEMIOLOGICAL PIECES OF EVIDENCE, AKI MAY PROGRESS TO CHRONIC KIDNEY DISEASE (CKD) EVEN AFTER A RECOVERY PERIOD DUE TO MALADAPTIVE REPAIR AND OTHER UNDERLYING MECHANISMS SUCH AS HEIGHTENED WNT SIGNALLING, OVERSTIMULATION OF THE RENIN-ANGIOTENSIN-ALDOSTERONE-SYSTEM (RAAS) PATHWAY, EPIGENETIC ALTERATIONS AND INHIBITION OF HYPOXIA-INDUCIBLE FACTOR (HIF) DEPENDENT DEFENCES. IT HAS BEEN REPORTED THAT RAAS ACTIVATION SUBSEQUENT TO RENAL INSULT MEDIATES INFLAMMATORY AND FIBROTIC MECHANISMS, WHICH ARE A HALLMARK OF CKD. MOREOVER, INTERESTING EVIDENCE REGARDING THE EXPOSURE-DEPENDENT DUAL ROLE OF WNT SIGNALLING IN BOTH INJURY AND REPAIR, EPIGENETIC CHANGES UNDERLYING KIDNEY DISEASE SUGGEST A POTENTIAL THERAPEUTIC ROLE OF THESE PATHWAYS IN AKI TO CKD CONTINUUM. IN ADDITION, THE HYPOXIA-INDEPENDENT RENAL BENEFITS OF ERYTHROPOIETIN SUCH AS ANTI-APOPTOSIS AND TUBULAR REGENERATION ALSO PRESENT AN AUSPICIOUS TARGET WHICH COULD BE USEFUL IN CLINICAL SETTINGS. IN THIS REVIEW, THE SPECIFIC ROLES OF THESE PATHWAYS IN KIDNEY DISEASE, THEIR PATHOLOGICAL MECHANISMS AND THERAPEUTIC STRATEGIES ARE DISCUSSED. MOREOVER, NOTABLE REPORTS CONCERNING STEM CELL THERAPY WHICH HOLD PROMISE IN HALTING AKI-CKD CONTINUUM WILL BE ELABORATED. 2019 12 6299 38 THE PROXIMAL TUBULE IS THE PRIMARY TARGET OF INJURY AND PROGRESSION OF KIDNEY DISEASE: ROLE OF THE GLOMERULOTUBULAR JUNCTION. THERE IS AN ALARMING GLOBAL INCREASE IN THE INCIDENCE OF END-STAGE KIDNEY DISEASE, FOR WHICH EARLY BIOMARKERS AND EFFECTIVE TREATMENT OPTIONS ARE LACKING. LARGELY BASED ON THE HISTOLOGY OF THE END-STAGE KIDNEY AND ON THE MODEL OF UNILATERAL URETERAL OBSTRUCTION, CURRENT INVESTIGATION IS FOCUSED ON THE PATHOGENESIS OF RENAL INTERSTITIAL FIBROSIS AS A CENTRAL MECHANISM IN THE PROGRESSION OF CHRONIC KIDNEY DISEASE (CKD). IT IS NOW RECOGNIZED THAT CUMULATIVE EPISODES OF ACUTE KIDNEY INJURY (AKI) CAN LEAD TO CKD, AND, CONVERSELY, CKD IS A RISK FACTOR FOR AKI. BASED ON RECENT AND HISTORIC STUDIES, THIS REVIEW SHIFTS ATTENTION FROM THE GLOMERULUS AND INTERSTITIUM TO THE PROXIMAL TUBULE AS THE PRIMARY SENSOR AND EFFECTOR IN THE PROGRESSION OF CKD AS WELL AS AKI. PACKED WITH MITOCHONDRIA AND DEPENDENT ON OXIDATIVE PHOSPHORYLATION, THE PROXIMAL TUBULE IS PARTICULARLY VULNERABLE TO INJURY (OBSTRUCTIVE, ISCHEMIC, HYPOXIC, OXIDATIVE, METABOLIC), RESULTING IN CELL DEATH AND ULTIMATELY IN THE FORMATION OF ATUBULAR GLOMERULI. ANIMAL MODELS OF HUMAN GLOMERULAR AND TUBULAR DISORDERS HAVE PROVIDED EVIDENCE FOR A BROAD REPERTOIRE OF MORPHOLOGICAL AND FUNCTIONAL RESPONSES OF THE PROXIMAL TUBULE, REVEALING PROCESSES OF DEGENERATION AND REPAIR THAT MAY LEAD TO NEW THERAPEUTIC STRATEGIES. MOST PROMISING ARE STUDIES THAT ENCOMPASS THE ENTIRE LIFE CYCLE FROM FETUS TO SENESCENCE, RECOGNIZING EPIGENETIC FACTORS. THE APPLICATION OF TECHNIQUES IN MOLECULAR CHARACTERIZATION OF TUBULE SEGMENTS AND THE DEVELOPMENT OF HUMAN KIDNEY ORGANOIDS MAY PROVIDE NEW INSIGHTS INTO THE MAMMALIAN KIDNEY SUBJECTED TO STRESS OR INJURY, LEADING TO BIOMARKERS OF EARLY CKD AND NEW THERAPIES. 2016 13 5994 28 TGFBETA-INCURRED EPIGENETIC ABERRATIONS OF MIRNA AND DNA METHYLTRANSFERASE SUPPRESS KLOTHO AND POTENTIATE RENAL FIBROSIS. RENAL FIBROSIS IS A COMMON PATHOLOGICAL FEATURE OF CHRONIC KIDNEY DISEASES (CKD) AND ITS DEVELOPMENT AND PROGRESSION ARE SIGNIFICANTLY AFFECTED BY EPIGENETIC MODIFICATIONS SUCH AS ABERRANT MIRNA AND DNA METHYLATION. KLOTHO IS AN ANTI-AGING AND ANTI-FIBROTIC PROTEIN AND ITS EARLY DECLINE AFTER RENAL INJURY IS REPORTEDLY ASSOCIATED WITH ABERRANT DNA METHYLATION. HOWEVER, THE KEY UPSTREAM PATHOLOGICAL MEDIATORS AND THE MOLECULAR CASCADE LEADING TO EPIGENETIC KLOTHO SUPPRESSION ARE NOT EXCLUSIVELY ESTABLISHED. HERE WE INVESTIGATE THE EPIGENETIC MECHANISM OF KLOTHO DEFICIENCY AND ITS FUNCTIONAL RELEVANCE IN RENAL FIBROGENESIS. FIBROTIC KIDNEYS INDUCED BY UNILATERAL URETERAL OCCLUSION (UUO) DISPLAYED MARKED KLOTHO SUPPRESSION AND THE PROMOTER HYPERMETHYLATION. THESE ABNORMALITIES WERE LIKELY DUE TO DEREGULATED TRANSFORMING GROWTH FACTOR-BETA (TGFBETA) SINCE TGFBETA ALONE CAUSED THE SIMILAR EPIGENETIC ABERRATIONS IN CULTURED RENAL CELLS AND TGFBETA BLOCKADE PREVENTED THE ALTERATIONS IN UUO KIDNEY. FURTHER INVESTIGATION REVEALED THAT TGFBETA ENHANCED DNA METHYLTRANSFERASE (DNMT) 1 AND DNMT3A VIA INHIBITING MIR-152 AND MIR-30A IN BOTH RENAL CELLS AND FIBROTIC KIDNEYS. ACCORDINGLY THE BLOCKADE OF EITHER TGFBETA SIGNALING OR DNMT1/3A ACTIVITIES SIGNIFICANTLY RECOVERED THE KLOTHO LOSS AND ATTENUATED PRO-FIBROTIC PROTEIN EXPRESSION AND RENAL FIBROSIS. MOREOVER, KLOTHO KNOCKDOWN BY RNA INTERFERENCES ABOLISHED THE ANTI-FIBROTIC EFFECTS OF DNMT INHIBITION IN BOTH TGFBETA-TREATED RENAL CELL AND UUO KIDNEY, INDICATING THAT TGFBETA-MEDIATED MIR-152/30A INHIBITIONS, DNMT1/3A ABERRATIONS AND SUBSEQUENT KLOTHO LOSS CONSTITUTE A CRITICAL REGULATORY LOOP THAT ELIMINATES KLOTHO'S ANTI-FIBROTIC ACTIVITIES AND POTENTIATES RENAL FIBROGENESIS. THUS, OUR STUDY ELABORATES A NOVEL EPIGENETIC CASCADE OF RENAL FIBROGENESIS AND REVEALS THE POTENTIAL THERAPEUTIC TARGETS FOR TREATING THE RENAL FIBROSIS-ASSOCIATED KIDNEY DISEASES. 2017 14 221 44 ACUTE KIDNEY INJURY TO CHRONIC KIDNEY DISEASE TRANSITION. BACKGROUND: ACUTE KIDNEY INJURY (AKI), EVEN IF FOLLOWED BY RENAL RECOVERY, IS A RISK FACTOR FOR THE FUTURE DEVELOPMENT OF CHRONIC KIDNEY DISEASE (CKD) AND END-STAGE RENAL DISEASE (ESRD). IN THE PREVIOUS YEARS, NOVEL INSIGHTS IN THE PATHOPHYSIOLOGY OF CKD PROGRESSION SUGGESTED A CAUSAL LINK BETWEEN AKI AND CKD DUE TO A MALADAPTIVE REPAIR AFTER SEVERE AND REPEATED INJURY. SUMMARY: SEVERAL PATHOLOGICAL MECHANISMS HAVE BEEN PROPOSED TO CONTRIBUTE TO THE PROGRESSION OF AKI AND TRANSITION TO CKD/ESRD INCLUDING HYPOXIA AND MICROVASCULAR RAREFACTION, ALTERATIONS OF RENAL RESIDENT CELL PHENOTYPES AND FUNCTIONS, CELL CYCLE ARREST IN THE G2/M PHASE, PERSISTENT CHRONIC INFLAMMATION, AND DEVELOPMENT OF INTERSTITIAL FIBROSIS, MITOCHONDRIAL FRAGMENTATION, EPIGENETIC CHANGES, ACTIVATION OF RENIN-ANGIOTENSIN SYSTEM (RAS), CELL AND TISSUE SENESCENCE. FURTHERMORE, SEVERAL CLINICAL FACTORS HAVE BEEN IDENTIFIED SUCH AS SEVERITY OF AKI, AGE, AND COMORBIDITIES. THE IDENTIFICATION OF AKI-TO-CKD BIOMARKERS COULD IMPROVE THE EARLY IDENTIFICATION OF AKI PATIENTS WITH HIGHER RISK FOR CKD PROGRESSION. HOWEVER, ALTHOUGH OUR UNDERSTANDING IN THE PATHOPHYSIOLOGY OF AKI-TO-CKD TRANSITION IS SIGNIFICANTLY IMPROVED, NO NOVEL INTERVENTION HAS BEEN VALIDATED. POTENTIAL THERAPEUTIC APPROACHES TO TREAT AKI AND BLOCK THE TRANSITION TO CKD/ESRD HAVE BEEN RECENTLY REPORTED, BUT THEY NEED FURTHER VALIDATIONS. KEY MESSAGES: MALADAPTIVE REPAIR AFTER AKI IS STRONGLY ASSOCIATED TO THE DEVELOPMENT OF CKD AND LONG-TERM CONSEQUENCES. THE PROMPT IDENTIFICATION OF PATIENTS AT HIGHER RISK FOR LATE CKD PROGRESSION AND THE DEVELOPMENT OF NEW THERAPEUTIC INTERVENTIONS REMAIN CRITICAL RESEARCH GOALS. 2018 15 6051 33 THE CONTRIBUTION OF HISTONE CROTONYLATION TO TISSUE HEALTH AND DISEASE: FOCUS ON KIDNEY HEALTH. ACUTE KIDNEY INJURY (AKI) AND CHRONIC KIDNEY DISEASE (CKD) ARE THE MOST SEVERE CONSEQUENCES OF KIDNEY INJURY. THEY ARE INTERCONNECTED SYNDROMES AS CKD PREDISPOSES TO AKI AND AKI MAY ACCELERATE CKD PROGRESSION. DESPITE THEIR GROWING IMPACT ON THE GLOBAL BURDEN OF DISEASE, THERE IS NO SATISFACTORY TREATMENT FOR AKI AND CURRENT THERAPEUTIC APPROACHES TO CKD REMAIN SUBOPTIMAL. RECENT RESEARCH HAS FOCUSED ON THE THERAPEUTIC TARGET POTENTIAL OF EPIGENETIC REGULATION OF GENE EXPRESSION, INCLUDING NON-CODING RNAS AND THE COVALENT MODIFICATIONS OF HISTONES AND DNA. INDEED, SEVERAL DRUGS TARGETING HISTONE MODIFICATIONS ARE IN CLINICAL USE OR UNDERGOING CLINICAL TRIALS. ACYL-LYSINE HISTONE MODIFICATIONS (E.G. METHYLATION, ACETYLATION, AND CROTONYLATION) HAVE MODULATED EXPERIMENTAL KIDNEY INJURY. MOST RECENTLY, INCREASED HISTONE LYSINE CROTONYLATION (KCR) WAS OBSERVED DURING EXPERIMENTAL AKI AND COULD BE REPRODUCED IN CULTURED TUBULAR CELLS EXPOSED TO INFLAMMATORY STRESS TRIGGERED BY THE CYTOKINE TWEAK. THE DEGREE OF KIDNEY HISTONE CROTONYLATION WAS MODULATED BY CROTONATE AVAILABILITY AND CROTONATE SUPPLEMENTATION PROTECTED FROM NEPHROTOXIC AKI. WE NOW REVIEW THE FUNCTIONAL RELEVANCE OF HISTONE CROTONYLATION IN KIDNEY DISEASE AND OTHER PATHOPHYSIOLOGICAL CONTEXTS, AS WELL AS THE IMPLICATIONS FOR THE DEVELOPMENT OF NOVEL THERAPEUTIC APPROACHES. THESE STUDIES PROVIDE INSIGHTS INTO THE OVERALL ROLE OF HISTONE CROTONYLATION IN HEALTH AND DISEASE. 2020 16 6647 39 UPDATE OF PERICYTES FUNCTION AND THEIR ROLES IN KIDNEY DISEASES. STUDIES HAVE HIGHLIGHTED THE SIGNIFICANT INVOLVEMENT OF KIDNEY PERICYTES IN RENAL FIBROSIS. KIDNEY PERICYTES, CLASSIFIED AS INTERSTITIAL MESENCHYMAL CELLS, ARE EXTENSIVELY BRANCHED, COLLAGEN-PRODUCING CELLS THAT CLOSELY INTERACT WITH ENDOTHELIAL CELLS. THIS ARTICLE AIMS TO PROVIDE AN OVERVIEW OF THE RECENT ADVANCEMENTS IN UNDERSTANDING THE PHYSIOLOGICAL FUNCTIONS OF PERICYTES AND THEIR ROLES IN KIDNEY DISEASES. IN A HEALTHY KIDNEY, PERICYTES HAVE ESSENTIAL PHYSIOLOGICAL FUNCTION IN ANGIOGENESIS, ERYTHROPOIETIN (EPO) PRODUCTION, AND THE REGULATION OF RENAL BLOOD FLOW. NEVERTHELESS, PERICYTE-MYOFIBROBLAST TRANSITION HAS BEEN IDENTIFIED AS THE PRIMARY CAUSE OF DISEASE PROGRESSION IN ACUTE KIDNEY INJURY (AKI)-TO-CHRONIC KIDNEY DISEASE (CKD) CONTINUUM. OUR RECENT RESEARCH HAS DEMONSTRATED THAT HYPOXIA-INDUCIBLE FACTOR-2ALPHA (HIF-2ALPHA) REGULATES ERYTHROPOIETIN PRODUCTION IN PERICYTES. HOWEVER, THIS PRODUCTION IS REPRESSED BY EPO GENE HYPERMETHYLATION AND HIF-2ALPHA DOWNREGULATION WHICH WERE INDUCED BY TRANSFORMING GROWTH FACTOR-BETA1-ACTIVATED DNA METHYLTRANSFERASE AND ACTIVIN RECEPTOR-LIKE KINASE-5 SIGNALING PATHWAY DURING RENAL FIBROSIS, RESPECTIVELY. ADDITIONALLY, AKI INDUCES EPIGENETIC MODIFICATIONS IN PERICYTES, RENDERING THEM MORE PRONE TO EXTRACELLULAR MATRIX PRODUCTION, CELL MIGRATION AND PROLIFERATION, THEREBY CONTRIBUTING TO SUBSEQUENT CAPILLARY RAREFACTION AND RENAL FIBROSIS. FURTHER INVESTIGATION INTO THE SPECIFIC FUNCTIONS AND ROLES OF DIFFERENT SUBPOPULATIONS OF PERICYTES MAY CONTRIBUTE FOR THE DEVELOPMENT OF TARGETED THERAPIES AIMED AT ATTENUATING KIDNEY DISEASE AND MITIGATING THEIR ADVERSE EFFECTS. 2023 17 3048 23 GENOME-WIDE ANALYSIS REVEALED THAT DZNEP REDUCES TUBULOINTERSTITIAL FIBROSIS VIA DOWN-REGULATION OF PRO-FIBROTIC GENES. TUBULOINTERSTITIAL FIBROSIS HAS BEEN RECENTLY REPORTED TO BE CAUSED BY THE COLLAPSE OF THE EPIGENETIC REGULATION OF KIDNEY DISEASES. WE EXAMINED WHETHER PHARMACOLOGICAL INHIBITION OF HISTONE MODIFICATION IS EFFECTIVE AGAINST RENAL FIBROSIS. DZNEP (3-DEAZANEPLANOCIN A) WAS ORIGINALLY DEVELOPED AS AN ANTI-CANCER DRUG TO INHIBIT THE REPRESSIVE HISTONE MARK, H3K27ME3. WE USED A MODEL OF CHRONIC TUBULOINTERSTITIAL FIBROSIS INDUCED BY UNILATERAL ISCHAEMIA/REPERFUSION AND ADMINISTERED DZNEP INTRAVENOUSLY TO THE MICE FOR 8 WEEKS. WE FOUND DZNEP CONTRIBUTES TO THE REDUCTION OF TUBULOINTERSTITIAL FIBROSIS. WE SELECTED ONLY TUBULAR CELLS FROM IN VIVO SAMPLES USING LASER-CAPTURE MICRODISSECTION BECAUSE EPIGENETIC REGULATION IS SPECIFIC TO THE CELL TYPES, AND WE FOCUSED ON THE CHANGES IN THE TUBULAR CELLS. WE PERFORMED A GENOME-WIDE ANALYSIS OF TUBULAR CELLS USING HIGH-THROUGHPUT SEQUENCING (RNA-SEQ) TO IDENTIFY NOVEL EPIGENETIC FACTORS ASSOCIATED WITH RENAL FIBROSIS. WE FOUND THAT PRO-FIBROTIC GENES SUCH AS COL3A1 (COLLAGEN TYPE 3A1) AND TIMP2 (TISSUE INHIBITOR OF METALLOPROTEINASE 2) WERE SUPPRESSED BY DZNEP IN VIVO. IN ADDITION, PRO-FIBROTIC GENES SUCH AS COL4A1 (COLLAGEN TYPE 4A1), TIMP2 AND MMP14 WERE DOWN-REGULATED BY DZNEP IN VITRO. IN CONCLUSION, WE FOUND THAT PHARMACOLOGICAL EPIGENETIC MODIFICATION BY DZNEP DECREASED THE EXPRESSION LEVELS OF FIBROGENIC GENES IN TUBULAR CELLS AND INHIBITED TUBULOINTERSTITIAL FIBROSIS. 2018 18 1474 30 DISTINCT PATTERNS OF TRANSCRIPTIONAL AND EPIGENETIC ALTERATIONS CHARACTERIZE ACUTE AND CHRONIC KIDNEY INJURY. ACUTE KIDNEY INJURY (AKI) AND CHRONIC KIDNEY DISEASE (CKD) ARE CONSIDERED EARLY AND LATE PHASES OF A PATHOLOGIC CONTINUUM OF INTERCONNECTED DISEASE STATES. ALTHOUGH CHANGES IN GENE EXPRESSION PATTERNS HAVE RECENTLY BEEN ELUCIDATED FOR THE TRANSITION OF AKI TO CKD, THE EPIGENETIC REGULATION OF KEY KIDNEY INJURY RELATED GENES REMAINS POORLY UNDERSTOOD. WE USED MULTIPLEX RT-QPCR, CHIP-QPCR AND INTEGRATIVE ANALYSIS TO COMPARE TRANSCRIPTIONAL AND EPIGENETIC CHANGES AT RENAL DISEASE-ASSOCIATED GENES ACROSS MOUSE AKI AND CKD MODELS. THESE STUDIES SHOWED THAT: (I) THERE ARE SUBSETS OF GENES WITH DISTINCT TRANSCRIPTIONAL AND EPIGENETICALLY PROFILES SHARED BY AKI AND CKD BUT ALSO SUBSETS THAT ARE SPECIFIC TO EITHER THE EARLY OR LATE STAGES OF RENAL INJURY; (II) DIFFERENCES IN EXPRESSION OF A SMALL NUMBER OF GENES IS SUFFICIENT TO DISTINGUISH AKI FROM CKD; (III) TRANSCRIPTION PLAYS A KEY ROLE IN THE UPREGULATION OF BOTH AKI AND CKD GENES WHILE POST-TRANSCRIPTIONAL REGULATION APPEARS TO PLAY A MORE SIGNIFICANT ROLE IN DECREASED EXPRESSION OF BOTH AKI AND CKD GENES; AND (IV) SUBSETS OF TRANSCRIPTIONALLY UPREGULATED GENES SHARE EPIGENETIC SIMILARITIES WHILE DOWNREGULATED GENES DO NOT. COLLECTIVELY, OUR STUDY SUGGESTS THAT IDENTIFIED COMMON TRANSCRIPTIONAL AND EPIGENETIC PROFILES OF KIDNEY INJURY LOCI COULD BE EXPLOITED FOR THERAPEUTIC TARGETING IN AKI AND CKD. 2018 19 6451 45 THERAPIES TARGETING EPIGENETIC ALTERATIONS IN ACUTE KIDNEY INJURY-TO-CHRONIC KIDNEY DISEASE TRANSITION. ACUTE KIDNEY INJURY (AKI) WAS PREVIOUSLY THOUGHT TO BE A MERELY TRANSIENT EVENT; HOWEVER, RECENT EPIDEMIOLOGICAL EVIDENCE SUPPORTS THE EXISTENCE OF A CAUSAL RELATIONSHIP BETWEEN AKI EPISODES AND SUBSEQUENT PROGRESSION TO CHRONIC KIDNEY DISEASE (CKD). ALTHOUGH THE PATHOPHYSIOLOGY OF THIS AKI-TO-CKD TRANSITION IS NOT FULLY UNDERSTOOD, IT IS MEDIATED BY THE INTERPLAY AMONG MULTIPLE COMPONENTS OF THE KIDNEY INCLUDING TUBULAR EPITHELIAL CELLS, ENDOTHELIAL CELLS, PERICYTES, INFLAMMATORY CELLS, AND MYOFIBROBLASTS. EPIGENETIC ALTERATIONS INCLUDING HISTONE MODIFICATION, DNA METHYLATION, NON-CODING RNAS, AND CHROMATIN CONFORMATIONAL CHANGES, ARE ALSO EXPECTED TO BE LARGELY INVOLVED IN THE PATHOPHYSIOLOGY AS A "MEMORY" OF THE INITIAL INJURY THAT CAN PERSIST AND PREDISPOSE TO CHRONIC PROGRESSION OF FIBROSIS. EACH EPIGENETIC MODIFICATION HAS A GREAT POTENTIAL AS A THERAPEUTIC TARGET OF AKI-TO-CKD TRANSITION; TIMELY AND TARGET-SPECIFIC EPIGENETIC INTERVENTIONS TO THE VARIOUS TEMPORAL STAGES OF AKI-TO-CKD TRANSITION WILL BE THE KEY TO FUTURE THERAPEUTIC APPLICATIONS IN CLINICAL PRACTICE. THIS REVIEW ELABORATES ON THE LATEST KNOWLEDGE OF EACH MECHANISM AND THE CURRENTLY AVAILABLE THERAPEUTIC AGENTS THAT TARGET EPIGENETIC MODIFICATION IN THE CONTEXT OF AKI-TO-CKD TRANSITION. FURTHER STUDIES WILL ELUCIDATE MORE DETAILED MECHANISMS AND NOVEL THERAPEUTIC TARGETS OF AKI-TO-CKD TRANSITION. 2022 20 5988 29 TGF-BETA/SMAD AND RENAL FIBROSIS. RENAL FIBROSIS IS CHARACTERIZED BY EXCESSIVE DEPOSITION OF EXTRACELLULAR MATRIX (ECM) THAT DISRUPTS AND REPLACES FUNCTIONAL PARENCHYMA, WHICH LEADS TO ORGAN FAILURE. IT IS KNOWN AS THE MAJOR PATHOLOGICAL MECHANISM OF CHRONIC KIDNEY DISEASE (CKD). ALTHOUGH CKD HAS AN IMPACT ON NO LESS THAN 10% OF THE WORLD POPULATION, THERAPEUTIC OPTIONS ARE STILL LIMITED. REGARDLESS OF ETIOLOGY, ELEVATED TGF-BETA LEVELS ARE HIGHLY CORRELATED WITH THE ACTIVATED PRO-FIBROTIC PATHWAYS AND DISEASE PROGRESSION. TGF-BETA, THE KEY DRIVER OF RENAL FIBROSIS, IS INVOLVED IN A DYNAMIC PATHOPHYSIOLOGICAL PROCESS THAT LEADS TO CKD AND END-STAGE RENAL DISEASE (ESRD). IT IS BECOMING CLEAR THAT EPIGENETICS REGULATES RENAL PROGRAMMING, AND THEREFORE, THE DEVELOPMENT AND PROGRESSION OF RENAL DISEASE. INDEED, RECENT EVIDENCE SHOWS TGF-BETA1/SMAD SIGNALING REGULATES RENAL FIBROSIS VIA EPIGENETIC-CORRELATED MECHANISMS. THIS REVIEW FOCUSES ON THE FUNCTION OF TGF-BETA/SMADS IN RENAL FIBROGENESIS, AND THE ROLE OF EPIGENETICS AS A REGULATOR OF PRO-FIBROTIC GENE EXPRESSION. 2019