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Lin Y, Sheng M, Qin H, Zhang P, Wang C, Fu W, Meng X, Wang D, Hou Y. Caspase 6 promotes innate immune activation by functional crosstalk between RIPK1-IκBα axis in liver inflammation. Cell Commun Signal 2023; 21:282. [PMID: 37828624 PMCID: PMC10568785 DOI: 10.1186/s12964-023-01287-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2023] [Accepted: 08/19/2023] [Indexed: 10/14/2023] Open
Abstract
BACKGROUND Caspase 6 is an essential regulator in innate immunity, inflammasome activation and host defense. We aimed to characterize the causal mechanism of Caspase 6 in liver sterile inflammatory injury. METHODS Human liver tissues were harvested from patients undergoing ischemia-related hepatectomy to evaluate Caspase 6 expression. Subsequently, we created Caspase 6-knockout (Caspase 6KO) mice to analyze roles and molecular mechanisms of macrophage Caspase 6 in murine models of liver ischemia/reperfusion (IR) injury. RESULTS In human liver biopsies, Caspase 6 expression was positively correlated with more severe histopathological injury and higher serum ALT/AST level at one day postoperatively. Moreover, Caspase 6 was mainly elevated in macrophages but not hepatocytes in ischemic livers. Unlike in controls, the Caspase 6-deficient livers were protected against IR injury, as evidenced by inhibition of inflammation, oxidative stress and iron overload. Disruption of macrophage NF-κB essential modulator (NEMO) in Caspase 6-deficient livers deteriorated liver inflammation and ferroptosis. Mechanistically, Caspase 6 deficiency spurred NEMO-mediated IκBα phosphorylation in macrophage. Then phosphorylated-inhibitor of NF-κBα (p-IκBα) co-localized with receptor-interacting serine/ threonine-protein kinase 1 (RIPK1) in the cytoplasm to degradate RIPK1 under inflammatory conditions. The disruption of RIPK1-IκBα interaction preserved RIPK1 degradation, triggering downstream apoptosis signal-regulating kinase 1 (ASK1) phosphorylation and inciting NIMA-related kinase 7/NOD-like receptor family pyrin domain containing 3 (NEK7/NLRP3) activation in macrophages. Moreover, ablation of macrophage RIPK1 or ASK1 diminished NEK7/NLRP3-driven inflammatory response and dampened hepatocyte ferroptosis by reducing HMGB1 release from macrophages. CONCLUSIONS Our findings underscore a novel mechanism of Caspase 6 mediated RIPK1-IκBα interaction in regulating macrophage NEK7/NLRP3 function and hepatocytes ferroptosis, which provides therapeutic targets for clinical liver IR injury. Video Abstract.
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Affiliation(s)
- Yuanbang Lin
- Department of General Surgery, Tianjin Medical University General Hospital, Anshan Road NO. 154, Tianjin, 300052, PR China, China.
| | - Mingwei Sheng
- Department of Anesthesiology, Tianjin First Central Hospital, Tianjin, China
| | - Hua Qin
- College of Life Sciences, Nankai University, Tianjin, 300071, China
| | - Peng Zhang
- Department of General Surgery, Tianjin Medical University General Hospital, Anshan Road NO. 154, Tianjin, 300052, PR China, China
| | - Chunli Wang
- Department of General Surgery, Tianjin Medical University General Hospital, Anshan Road NO. 154, Tianjin, 300052, PR China, China
| | - Wei Fu
- Department of General Surgery, Tianjin Medical University General Hospital, Anshan Road NO. 154, Tianjin, 300052, PR China, China
| | - Xiangjun Meng
- Department of General Surgery, Tianjin Medical University General Hospital, Anshan Road NO. 154, Tianjin, 300052, PR China, China
| | - Duowei Wang
- Department of General Surgery, Tianjin Medical University General Hospital, Anshan Road NO. 154, Tianjin, 300052, PR China, China
| | - Yachao Hou
- Department of General Surgery, Tianjin Medical University General Hospital, Anshan Road NO. 154, Tianjin, 300052, PR China, China
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Sanz AB, Sanchez-Niño MD, Ramos AM, Ortiz A. Regulated cell death pathways in kidney disease. Nat Rev Nephrol 2023; 19:281-299. [PMID: 36959481 PMCID: PMC10035496 DOI: 10.1038/s41581-023-00694-0] [Citation(s) in RCA: 66] [Impact Index Per Article: 66.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/16/2023] [Indexed: 03/25/2023]
Abstract
Disorders of cell number that result from an imbalance between the death of parenchymal cells and the proliferation or recruitment of maladaptive cells contributes to the pathogenesis of kidney disease. Acute kidney injury can result from an acute loss of kidney epithelial cells. In chronic kidney disease, loss of kidney epithelial cells leads to glomerulosclerosis and tubular atrophy, whereas interstitial inflammation and fibrosis result from an excess of leukocytes and myofibroblasts. Other conditions, such as acquired cystic disease and kidney cancer, are characterized by excess numbers of cyst wall and malignant cells, respectively. Cell death modalities act to clear unwanted cells, but disproportionate responses can contribute to the detrimental loss of kidney cells. Indeed, pathways of regulated cell death - including apoptosis and necrosis - have emerged as central events in the pathogenesis of various kidney diseases that may be amenable to therapeutic intervention. Modes of regulated necrosis, such as ferroptosis, necroptosis and pyroptosis may cause kidney injury directly or through the recruitment of immune cells and stimulation of inflammatory responses. Importantly, multiple layers of interconnections exist between different modalities of regulated cell death, including shared triggers, molecular components and protective mechanisms.
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Affiliation(s)
- Ana B Sanz
- Department of Nephrology and Hypertension, IIS-Fundacion Jimenez Diaz UAM, Madrid, Spain
- RICORS2040, Madrid, Spain
| | - Maria Dolores Sanchez-Niño
- Department of Nephrology and Hypertension, IIS-Fundacion Jimenez Diaz UAM, Madrid, Spain
- RICORS2040, Madrid, Spain
- Departamento de Medicina, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain
| | - Adrian M Ramos
- Department of Nephrology and Hypertension, IIS-Fundacion Jimenez Diaz UAM, Madrid, Spain
- RICORS2040, Madrid, Spain
| | - Alberto Ortiz
- Department of Nephrology and Hypertension, IIS-Fundacion Jimenez Diaz UAM, Madrid, Spain.
- RICORS2040, Madrid, Spain.
- Departamento de Farmacología, Universidad Autonoma de Madrid, Madrid, Spain.
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Qi L, Wang L, Jin M, Jiang M, Li L, Li Y. Caspase-6 is a key regulator of cross-talk signal way in PANoptosis in cancer. Immunology 2023. [PMID: 36814103 DOI: 10.1111/imm.13633] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2021] [Accepted: 02/20/2023] [Indexed: 02/24/2023] Open
Abstract
Cysteinyl aspartate specific proteinase (caspase)-6 belongs to the caspase family and plays a vital role in mediating cell death. Under certain conditions, three pathways of programmed cell death (PCD), including apoptosis, necroptosis and pyroptosis (PANoptosis), transform one way into another, with enormous therapeutic potential. Initially, scholars reported that caspase-6 is a caspase executor that mediates apoptosis. With the ceaseless exploration of the PCD types, studies have demonstrated that caspase-6 mediates pyroptosis by regulating gasdermin D and mediates necroptosis by regulating mixed lineage kinase domain-like. By regulating PANoptosis, caspase-6 plays a crucial role in tumorigenesis in humans and mediates anti-tumour immunity. Therefore, a comprehensive understanding of caspase-6 function in cancer via PANoptosis is important for the prevention and therapy of tumours. This article summarized the function of caspase-6 in PANoptosis and its impact on cancer development, providing targets and strategies for tumour treatment.
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Affiliation(s)
- Ling Qi
- Department of Gastrointestinal Oncology, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang, China.,Department of Medical Oncology, the Affiliated Hospital of Hebei North University, Zhangjiakou, Hebei, China
| | - Li Wang
- Department of Gastrointestinal Oncology, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang, China
| | - Mengru Jin
- Department of Gastrointestinal Oncology, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang, China.,Department of Medical Oncology, National Cancer Center, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Mingxia Jiang
- Department of Gastrointestinal Oncology, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang, China.,Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Lisha Li
- Department of Gastrointestinal Oncology, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang, China.,Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Yanjing Li
- Department of Gastrointestinal Oncology, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang, China
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4
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Girling KD, Demers MJ, Laine J, Zhang S, Wang YT, Graham RK. Activation of caspase-6 and cleavage of caspase-6 substrates is an early event in NMDA receptor-mediated excitotoxicity. J Neurosci Res 2017; 96:391-406. [DOI: 10.1002/jnr.24153] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Revised: 08/10/2017] [Accepted: 08/18/2017] [Indexed: 12/21/2022]
Affiliation(s)
- Kimberly D. Girling
- University of British Columbia, Brain Research Centre & Department of Medicine; Vancouver British Columbia Canada
| | - Marie-Josee Demers
- Research Centre on Aging, Department Pharmacology and Physiology, Faculty of Medicine and Health Sciences; University of Sherbrooke; Sherbrooke Quebec Canada
| | - Jean Laine
- Research Centre on Aging, Department Pharmacology and Physiology, Faculty of Medicine and Health Sciences; University of Sherbrooke; Sherbrooke Quebec Canada
| | - Shu Zhang
- University of British Columbia, Brain Research Centre & Department of Medicine; Vancouver British Columbia Canada
| | - Yu Tian Wang
- University of British Columbia, Brain Research Centre & Department of Medicine; Vancouver British Columbia Canada
| | - Rona K. Graham
- Research Centre on Aging, Department Pharmacology and Physiology, Faculty of Medicine and Health Sciences; University of Sherbrooke; Sherbrooke Quebec Canada
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Riechers SP, Butland S, Deng Y, Skotte N, Ehrnhoefer DE, Russ J, Laine J, Laroche M, Pouladi MA, Wanker EE, Hayden MR, Graham RK. Interactome network analysis identifies multiple caspase-6 interactors involved in the pathogenesis of HD. Hum Mol Genet 2016; 25:1600-18. [DOI: 10.1093/hmg/ddw036] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2015] [Accepted: 02/05/2016] [Indexed: 11/14/2022] Open
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Kaya C, Karabulut R, Turkyilmaz Z, Sonmez K, Kulduk G, Gülbahar Ö, Köse F, Basaklar AC. Lycopene has reduced renal damage histopathologically and biochemically in experimental renal ischemia-reperfusion injury. Ren Fail 2015; 37:1390-5. [DOI: 10.3109/0886022x.2015.1064742] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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7
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Wang XJ, Cao Q, Zhang Y, Su XD. Activation and regulation of caspase-6 and its role in neurodegenerative diseases. Annu Rev Pharmacol Toxicol 2014; 55:553-72. [PMID: 25340928 DOI: 10.1146/annurev-pharmtox-010814-124414] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Caspases, a family of cysteine proteases, are major mediators of apoptosis and inflammation. Caspase-6 is classified as an apoptotic effector, and it mediates nuclear shrinkage during apoptosis, but it possesses unique activation and regulation mechanisms that differ from those of other effector caspases. Furthermore, increasing evidence has shown that caspase-6 is highly involved in axon degeneration and neurodegenerative diseases, such as Huntington's disease and Alzheimer's disease. Cleavage at the caspase-6 site in mutated huntingtin protein is a prerequisite for the development of the characteristic behavioral and neuropathological features of Huntington's disease. Active caspase-6 is present in early stages of Alzheimer's disease, and caspase-6 activity is associated with the disease's pathological lesions. In this review, we discuss the evidence relevant to the role of caspase-6 in neurodegenerative diseases and summarize its activation and regulation mechanisms. In doing so, we provide new insight about potential therapeutic approaches that incorporate the modulation of caspase-6 function for the treatment of neurodegenerative diseases.
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Affiliation(s)
- Xiao-Jun Wang
- State Key Laboratory of Protein and Plant Gene Research and
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8
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Secher N, Soendergaard P, Ravlo K, Soelling C, Granfeldt A, Wogensen L, Keller AK, Moeldrup U, Ostraat EO, Joergensen TM, Jespersen B, Toennesen E. No effect of remote ischaemic conditioning on inflammation in a porcine kidney transplantation model. Transpl Immunol 2014; 31:98-104. [DOI: 10.1016/j.trim.2014.05.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2014] [Revised: 05/26/2014] [Accepted: 05/27/2014] [Indexed: 02/04/2023]
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9
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Romero MJ, Yao L, Sridhar S, Bhatta A, Dou H, Ramesh G, Brands MW, Pollock DM, Caldwell RB, Cederbaum SD, Head CA, Bagi Z, Lucas R, Caldwell RW. l-Citrulline Protects from Kidney Damage in Type 1 Diabetic Mice. Front Immunol 2013; 4:480. [PMID: 24400007 PMCID: PMC3871963 DOI: 10.3389/fimmu.2013.00480] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2013] [Accepted: 12/09/2013] [Indexed: 01/01/2023] Open
Abstract
RATIONALE Diabetic nephropathy (DN) is a major cause of end-stage renal disease, associated with endothelial dysfunction. Chronic supplementation of l-arginine (l-arg), the substrate for endothelial nitric oxide synthase (eNOS), failed to improve vascular function. l-Citrulline (l-cit) supplementation not only increases l-arg synthesis, but also inhibits cytosolic arginase I, a competitor of eNOS for the use of l-arg, in the vasculature. AIMS To investigate whether l-cit treatment reduces DN in streptozotocin (STZ)-induced type 1 diabetes (T1D) in mice and rats and to study its effects on arginase II (ArgII) function, the main renal isoform. METHODS STZ-C57BL6 mice received l-cit or vehicle supplemented in the drinking water. For comparative analysis, diabetic ArgII knock out mice and l-cit-treated STZ-rats were evaluated. RESULTS l-Citrulline exerted protective effects in kidneys of STZ-rats, and markedly reduced urinary albumin excretion, tubulo-interstitial fibrosis, and kidney hypertrophy, observed in untreated diabetic mice. Intriguingly, l-cit treatment was accompanied by a sustained elevation of tubular ArgII at 16 weeks and significantly enhanced plasma levels of the anti-inflammatory cytokine IL-10. Diabetic ArgII knock out mice showed greater blood urea nitrogen levels, hypertrophy, and dilated tubules than diabetic wild type (WT) mice. Despite a marked reduction in collagen deposition in ArgII knock out mice, their albuminuria was not significantly different from diabetic WT animals. l-Cit also restored nitric oxide/reactive oxygen species balance and barrier function in high glucose-treated monolayers of human glomerular endothelial cells. Moreover, l-cit also has the ability to establish an anti-inflammatory profile, characterized by increased IL-10 and reduced IL-1β and IL-12(p70) generation in the human proximal tubular cells. CONCLUSION l-Citrulline supplementation established an anti-inflammatory profile and significantly preserved the nephron function during T1D.
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Affiliation(s)
- Maritza J Romero
- Department of Pharmacology and Toxicology, Georgia Regents University , Augusta, GA , USA ; Department of Anesthesiology and Perioperative Medicine, Georgia Regents University , Augusta, GA , USA ; Vascular Biology Center, Georgia Regents University , Augusta, GA , USA
| | - Lin Yao
- Department of Pharmacology and Toxicology, Georgia Regents University , Augusta, GA , USA
| | - Supriya Sridhar
- Vascular Biology Center, Georgia Regents University , Augusta, GA , USA
| | - Anil Bhatta
- Department of Pharmacology and Toxicology, Georgia Regents University , Augusta, GA , USA
| | - Huijuan Dou
- Vascular Biology Center, Georgia Regents University , Augusta, GA , USA
| | - Ganesan Ramesh
- Vascular Biology Center, Georgia Regents University , Augusta, GA , USA ; Department of Medicine, Georgia Regents University , Augusta, GA , USA
| | - Michael W Brands
- Department of Physiology, Georgia Regents University , Augusta, GA , USA
| | - David M Pollock
- Department of Pharmacology and Toxicology, Georgia Regents University , Augusta, GA , USA ; Department of Medicine, Georgia Regents University , Augusta, GA , USA
| | - Ruth B Caldwell
- Vascular Biology Center, Georgia Regents University , Augusta, GA , USA ; Department of Cell Biology and Anatomy, Georgia Regents University , Augusta, GA , USA ; Department of Ophthalmology, Georgia Regents University , Augusta, GA , USA ; VA Medical Center, Georgia Regents University , Augusta, GA , USA
| | - Stephen D Cederbaum
- Intellectual and Developmental Disabilities Research Center/Neuropsychiatric Institute (IDDRC/NPI), University of California Los Angeles School of Medicine , Los Angeles, CA , USA
| | - C Alvin Head
- Department of Anesthesiology and Perioperative Medicine, Georgia Regents University , Augusta, GA , USA
| | - Zsolt Bagi
- Vascular Biology Center, Georgia Regents University , Augusta, GA , USA
| | - Rudolf Lucas
- Department of Pharmacology and Toxicology, Georgia Regents University , Augusta, GA , USA ; Vascular Biology Center, Georgia Regents University , Augusta, GA , USA ; Division of Pulmonary Medicine, Georgia Regents University , Augusta, GA , USA
| | - Robert W Caldwell
- Department of Pharmacology and Toxicology, Georgia Regents University , Augusta, GA , USA ; Department of Physiology, Georgia Regents University , Augusta, GA , USA
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10
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Ehrnhoefer DE, Skotte NH, Ladha S, Nguyen YTN, Qiu X, Deng Y, Huynh KT, Engemann S, Nielsen SM, Becanovic K, Leavitt BR, Hasholt L, Hayden MR. p53 increases caspase-6 expression and activation in muscle tissue expressing mutant huntingtin. Hum Mol Genet 2013; 23:717-29. [PMID: 24070868 DOI: 10.1093/hmg/ddt458] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Activation of caspase-6 in the striatum of both presymptomatic and affected persons with Huntington's disease (HD) is an early event in the disease pathogenesis. However, little is known about the role of caspase-6 outside the central nervous system (CNS) and whether caspase activation might play a role in the peripheral phenotypes, such as muscle wasting observed in HD. We assessed skeletal muscle tissue from HD patients and well-characterized mouse models of HD. Cleavage of the caspase-6 specific substrate lamin A is significantly increased in skeletal muscle obtained from HD patients as well as in muscle tissues from two different HD mouse models. p53, a transcriptional activator of caspase-6, is upregulated in neuronal cells and tissues expressing mutant huntingtin. Activation of p53 leads to a dramatic increase in levels of caspase-6 mRNA, caspase-6 activity and cleavage of lamin A. Using mouse embryonic fibroblasts (MEFs) from YAC128 mice, we show that this increase in caspase-6 activity can be mitigated by pifithrin-α (pifα), an inhibitor of p53 transcriptional activity, but not through the inhibition of p53's mitochondrial pro-apoptotic function. Remarkably, the p53-mediated increase in caspase-6 expression and activation is exacerbated in cells and tissues of both neuronal and peripheral origin expressing mutant huntingtin (Htt). These findings suggest that the presence of the mutant Htt protein enhances p53 activity and lowers the apoptotic threshold, which activates caspase-6. Furthermore, these results suggest that this pathway is activated both within and outside the CNS in HD and may contribute to both loss of CNS neurons and muscle atrophy.
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Affiliation(s)
- Dagmar E Ehrnhoefer
- Centre for Molecular Medicine and Therapeutics (CMMT), Department of Medical Genetics, CFRI, University of British Columbia, 950 West 28th Avenue, Vancouver, BC V5Z 4H4, Canada
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11
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Velázquez-Delgado EM, Hardy JA. Zinc-mediated allosteric inhibition of caspase-6. J Biol Chem 2012; 287:36000-11. [PMID: 22891250 DOI: 10.1074/jbc.m112.397752] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Zinc and caspase-6 have independently been implicated in several neurodegenerative disorders. Depletion of zinc intracellularly leads to apoptosis by an unknown mechanism. Zinc inhibits cysteine proteases, including the apoptotic caspases, leading to the hypothesis that zinc-mediated inhibition of caspase-6 might contribute to its regulation in a neurodegenerative context. Using inductively coupled plasma optical emission spectroscopy, we observed that caspase-6 binds one zinc per monomer, under the same conditions where the zinc leads to complete loss of enzymatic activity. To understand the molecular details of zinc binding and inhibition, we performed an anomalous diffraction experiment above the zinc edge. The anomalous difference maps showed strong 5σ peaks, indicating the presence of one zinc/monomer bound at an exosite distal from the active site. Zinc was not observed bound to the active site. The zinc in the exosite was liganded by Lys-36, Glu-244, and His-287 with a water molecule serving as the fourth ligand, forming a distorted tetrahedral ligation sphere. This exosite appears to be unique to caspase-6, as the residues involved in zinc binding were not conserved across the caspase family. Our data suggest that binding of zinc at the exosite is the primary route of inhibition, potentially locking caspase-6 into the inactive helical conformation.
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12
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Abstract
Acute kidney injury (AKI) is the leading cause of nephrology consultation and is associated with high mortality rates. The primary causes of AKI include ischemia, hypoxia, or nephrotoxicity. An underlying feature is a rapid decline in glomerular filtration rate (GFR) usually associated with decreases in renal blood flow. Inflammation represents an important additional component of AKI leading to the extension phase of injury, which may be associated with insensitivity to vasodilator therapy. It is suggested that targeting the extension phase represents an area potential of treatment with the greatest possible impact. The underlying basis of renal injury appears to be impaired energetics of the highly metabolically active nephron segments (i.e., proximal tubules and thick ascending limb) in the renal outer medulla, which can trigger conversion from transient hypoxia to intrinsic renal failure. Injury to kidney cells can be lethal or sublethal. Sublethal injury represents an important component in AKI, as it may profoundly influence GFR and renal blood flow. The nature of the recovery response is mediated by the degree to which sublethal cells can restore normal function and promote regeneration. The successful recovery from AKI depends on the degree to which these repair processes ensue and these may be compromised in elderly or chronic kidney disease (CKD) patients. Recent data suggest that AKI represents a potential link to CKD in surviving patients. Finally, earlier diagnosis of AKI represents an important area in treating patients with AKI that has spawned increased awareness of the potential that biomarkers of AKI may play in the future.
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Affiliation(s)
- David P Basile
- Department of Cellular & Integrative Physiology, Indiana University School of Medicine, Indianapolis, Indiana, USA.
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13
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Graham RK, Ehrnhoefer DE, Hayden MR. Caspase-6 and neurodegeneration. Trends Neurosci 2011; 34:646-56. [DOI: 10.1016/j.tins.2011.09.001] [Citation(s) in RCA: 97] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2011] [Revised: 09/02/2011] [Accepted: 09/13/2011] [Indexed: 01/10/2023]
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Cavalcanti MCO, Steilmann C, Failing K, Bergmann M, Kliesch S, Weidner W, Steger K. Apoptotic gene expression in potentially fertile and subfertile men. Mol Hum Reprod 2011; 17:415-20. [PMID: 21317160 DOI: 10.1093/molehr/gar011] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Human sperm contain similar amounts of protamine-1 (P1) and protamine-2 (P2). Although an aberrant protamine ratio have been observed in subfertile men, functional evidence is provided by protamine knockout mice exhibiting male infertility. As sperm DNA integrity is known to be linked with DNA fragmentation and apoptosis, we investigated whether the DNA fragmentation factor 40 (DFF40) ratio or caspase (Casp4, Casp6) and tumor necrosis factor superfamily member 10 (TNFSF10) ratio together with the P1/P2 ratio represents a reliable biomarker to discriminate between fertile and subfertile men. Real-time quantitative RT-PCR was used for amplification of P1, P2 and DFF40 in 49 testicular biopsies. Casp4, Casp6 and TNFSF10 have been selected from a PCR apoptosis array and were further investigated in another group of testicular biopsies (22 subfertile men versus 11 potentially fertile men). Using Spearman's rank correlation coefficient analysis, we did not find a correlation between DFF40 and P1, P2, P1/P2, score, fertilization rate and age. In addition, logistic regression analysis demonstrated no statistically significant effect of the analyzed variables on pregnancy. A two-way analysis of variance with repeated measures of relative expression of Casp4, Casp6 and TNFSF10 versus P1 or P2 in potentially fertile men and subfertile patients demonstrated statistically significant differences between both groups, all tested gene combinations and the interaction between two genes and both groups in all cases analyzed. Furthermore, significant differences in the expression of Casp4 and TNFSF10 between the groups of potentially fertile and subfertile men could be demonstrated. In addition, the means of differences of selected gene combinations revealed that the protamine to apoptotic gene ratio is statistically different between both groups. Our data suggest that Casp4, Casp 6 and TNFSF10 are differentially expressed in potentially fertile and subfertile men and represent useful biomarkers for predicting male fertility in combination with P1 and P2.
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Affiliation(s)
- M C O Cavalcanti
- Department of Urology, Pediatric Urology and Andrology, Justus-Liebig University Giessen, Rudolf-Buchheim-Str. 7, Giessen D-35385, Germany
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Jortay J, Senou M, Delaigle A, Noel L, Funahashi T, Maeda N, Many MC, Brichard SM. Local induction of adiponectin reduces lipopolysaccharide-triggered skeletal muscle damage. Endocrinology 2010; 151:4840-51. [PMID: 20702578 DOI: 10.1210/en.2009-1462] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Adiponectin (ApN) exhibits metabolic and antiinflammatory properties. This hormone is exclusively secreted by adipocytes under normal conditions. We have shown that ApN was induced in tibialis anterior muscle of mice injected with lipopolysaccharide (LPS) and in C2C12 myotubes cultured with proinflammatory cytokines. We hypothesized that muscle ApN could be a local protective mechanism to counteract excessive inflammatory reaction and oxidative damage. To test this paradigm, we examined whether muscles of ApN-knockout (KO) mice exhibit a higher degree of oxidative stress and apoptosis than wild-type mice when challenged by ip LPS and whether these abnormalities may be corrected by local administration of ApN. Eventually we investigated the effects of ApN in vitro. When compared with wild-type mice, ApN-KO mice exhibited myocyte degenerescence, especially after LPS. Myocytes of ApN-KO mice also displayed much stronger immunolabeling for markers of oxidative stress (peroxiredoxin-3/5 and heme oxygenase-1) as well as for a lipid peroxidation product (hydroxynonenal). Expression of TNF-α, caspase-6, a marker of apoptosis, and nuclear factor-κB was enhanced as well. Eventually muscle electrotransfer of the ApN gene, which did not induce any rise of systemic ApN, corrected all these abnormalities in LPS-injected ApN-KO mice. Likewise, ApN attenuated LPS-induced production of proinflammatory cytokines and activation of nuclear factor-κB in C2C12 cells. Thus, induction of ApN into skeletal muscle in response to an inflammatory aggression appears to be a crucial mechanism to counteract in an autocrine or paracrine fashion excessive inflammatory damage, oxidative stress, and subsequent apoptosis.
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Affiliation(s)
- Julie Jortay
- Endocrinology and Metabolism Unit, Faculty of Louvain, Brussels, Belgium
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16
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Kanduc D. Protein information content resides in rare peptide segments. Peptides 2010; 31:983-8. [PMID: 20153390 DOI: 10.1016/j.peptides.2010.02.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2010] [Revised: 02/03/2010] [Accepted: 02/03/2010] [Indexed: 01/01/2023]
Abstract
Discovering the informational rule(s) underlying structure-function relationships in the protein language is at the core of biology. Current theories have proven inadequate to explain the origins of biological information such as that found in nucleotide and amino acid sequences. Here, we demonstrate that the information content of an amino acid motif correlates with the motif rarity. A structured analysis of the scientific literature supports the theory that rare pentapeptide words have higher significance than more common pentapeptides in biological cell 'talk'. This study expands on our previous research showing that the immunological information contained in an amino acid sequence is inversely related to the sequence frequency in the host proteome.
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Affiliation(s)
- Darja Kanduc
- Department of Biochemistry and Molecular Biology, University of Bari, Italy.
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17
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Abstract
Bladder cancer is a very common and aggressive tumor entity. Unfortunately, common chemotherapy is not able to cure advanced bladder cancer. Therefore, several attempts have been made to improve the response to chemotherapy. Because changes in apoptotic pathways are frequent events in the development of chemoresistance of malignancies, pro-apoptotic treatment seems promising for the improvement of bladder cancer prognosis. Preclinical data show potential ways for a successful combination of apoptosis agonists with conventional chemotherapy. None of these principles has so far successfully been translated into clinical trials for bladder cancer. This review describes actual studies and future perspectives for apoptotic agonists in bladder cancer.
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Affiliation(s)
- Chris Protzel
- Department of Urology, University of Rostock, 18057 Rostock, Germany
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18
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Ashkenazi A. Directing cancer cells to self-destruct with pro-apoptotic receptor agonists. Nat Rev Drug Discov 2008; 7:1001-12. [DOI: 10.1038/nrd2637] [Citation(s) in RCA: 335] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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19
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Gross J, Machulik A, Amarjargal N, Moller R, Ungethüm U, Kuban RJ, Fuchs FU, Andreeva N, Fuchs J, Henke W, Pohl EE, Szczepek AJ, Haupt H, Mazurek B. Expression of apoptosis-related genes in the organ of Corti, modiolus and stria vascularis of newborn rats. Brain Res 2007; 1162:56-68. [PMID: 17612509 DOI: 10.1016/j.brainres.2007.05.061] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2006] [Revised: 04/19/2007] [Accepted: 05/21/2007] [Indexed: 11/17/2022]
Abstract
Cell death in the inner ear tissues is an important mechanism leading to hearing impairment. Here, using microarrays and real-time RT-PCR we analyzed expression of selected apoptosis-related genes in rat's inner ear. We determined the gene expression in tissues freshly isolated from neonatal rats (3-5 days old) and compared it to that of explants cultured for 24 h under normoxic or hypoxic conditions. For the analyses, we used pooled samples of the organ of Corti (OC), modiolus (MOD) and stria vascularis (SV), respectively. We observed region-specific changes in gene expression between the fresh tissues and the normoxic culture. In the OC, expression of the proapoptotic genes caspase-2, caspase-3, caspase-6 and calpain-1 was downregulated. In the MOD, the antioxidative defense SOD-2 and SOD-3 were upregulated. In the SV, caspase-2, caspase-6, calpain-1 and SOD-3 were downregulated and SOD-2 upregulated. We speculate that these changes could reflect survival shift in transcriptome of inner ear explants tissues under in vitro conditions. With the exception of SOD-2, hypoxic culture conditions induced the same changes in gene expression as the normoxic conditions indicating that culture preparation is likely the dominating factor, which modifies the gene expression pattern. We conclude that various culture conditions induce different expression pattern of apoptosis-related genes in the organotypic cochlear cultures, as compared to fresh tissues. This transcriptional pattern may reflect the survival ability of specific tissues and could become a tempting target for a pharmacological intervention in inner ear diseases.
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Affiliation(s)
- Johann Gross
- Dept. Othorhinolaryngology, Charité-Universitätsmedizin Berlin, Molecular Biology Research Laboratory, Charitéplatz 1, 10117-Berlin, Germany.
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20
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Sharples EJ, Thiemermann C, Yaqoob MM. Mechanisms of Disease: cell death in acute renal failure and emerging evidence for a protective role of erythropoietin. ACTA ACUST UNITED AC 2005; 1:87-97. [PMID: 16932374 DOI: 10.1038/ncpneph0042] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2005] [Accepted: 09/02/2005] [Indexed: 12/29/2022]
Abstract
Acute renal failure--characterized by a sudden loss of the ability of the kidneys to excrete nitrogenous waste, and to maintain electrolyte homeostasis and fluid balance--is a frequently encountered clinical problem, particularly in the intensive care unit. Unfortunately, advances in supportive interventions have done little to reduce the high mortality associated with this condition. Might erythropoietin (EPO) have utility as a therapeutic agent in acute renal failure? This hormone mediates anti-apoptotic effects in the bone marrow, facilitating maturation and differentiation of erythroid progenitors. New evidence indicates that EPO also exerts anti-apoptotic effects in the brain, heart and vasculature, which can limit the degree of organ damage. Here, we review the emerging biological role of EPO in the kidney and the pathophysiology of ischemia-reperfusion injury in an attempt to understand the therapeutic potential of EPO in acute renal failure.
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Affiliation(s)
- Edward J Sharples
- Centre for Experimental Medicine, Nephrology and Critical Care, The William Harvey Research Institute, St Bartholomew's and The Royal London School of Medicine and Dentistry, Queen Mary-University of London, London EC1M 6BQ, UK.
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21
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Bouralexis S, Findlay DM, Evdokiou A. Death to the bad guys: targeting cancer via Apo2L/TRAIL. Apoptosis 2005; 10:35-51. [PMID: 15711921 DOI: 10.1007/s10495-005-6060-0] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
All higher organisms consist of an ordered society of individual cells that must communicate to maintain and regulate their functions. This is achieved through a complex but highly regulated network of hormones, chemical mediators, chemokines and other cytokines, acting as ligands for intra or extra-cellular receptors. Ligands and receptors of the tumor necrosis factor (TNF) superfamilies are examples of signal transducers, whose integrated actions influence the development, homeostasis and adaptive responses of many cells and tissue types. Apo2L/TRAIL is one of several members of the tumour necrosis factor superfamily that induce apoptosis through the engagement of death receptors. Apo2L/TRAIL interacts with an unusually complex receptor system, which in humans comprises two death receptors and three decoy receptors. This molecule has received considerable attention recently because of the finding that many cancer cell types are sensitive to Apo2L/TRAIL-induced apoptosis, while most normal cells appear to be resistant to this action of Apo2L/TRAIL. In this review, we specifically emphasise on the actions of Apo2L/TRAIL with respect to its apoptotic signaling pathways and summarise what is known about its physiological role. The potential therapeutic usefulness of Apo2L/TRAIL, especially in combination with chemotherapeutic agents, is also discussed in some detail.
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Affiliation(s)
- S Bouralexis
- St Vincent's Institute of Medical Research, Fitzroy, 3065, Victoria, Australia.
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22
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Shinno Y, Gunduz M, Gunduz E, Shimizu K, Yoshiyama M, Yasuoka A, Nagai N. Identification of Caspase-6 as A Candidate Tumor Suppressor Gene at 4q25 in Oral Cancer. J HARD TISSUE BIOL 2005. [DOI: 10.2485/jhtb.14.328] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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23
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Tejera N, Gómez-Garre D, Lázaro A, Gallego-Delgado J, Alonso C, Blanco J, Ortiz A, Egido J. Persistent proteinuria up-regulates angiotensin II type 2 receptor and induces apoptosis in proximal tubular cells. THE AMERICAN JOURNAL OF PATHOLOGY 2004; 164:1817-26. [PMID: 15111328 PMCID: PMC1615640 DOI: 10.1016/s0002-9440(10)63740-6] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 01/09/2004] [Indexed: 11/22/2022]
Abstract
Apoptosis is implicated in the progressive cell loss and fibrosis both at glomerular and tubulointerstitial level. In this study, we examined the potential mechanisms by which persistent proteinuria (protein-overload model) could induce apoptosis. After uninephrectomy (UNX), Wistar rats received daily injections of 0.5 g of bovine serum albumin (BSA)/100 g body weight or saline. Both at day 8 and day 28, rats receiving BSA had proteinuria and renal lesions characterized by tubular atrophy and/or dilation and mononuclear cell infiltration. In relation to control-UNX rats, renal cortex of nephritic rats showed an increment in AT2 mRNA (reverse transcriptase-polymerase chain reaction) and protein (Western blot) expression. In both groups, AT2 receptor immunostaining was mainly localized in proximal tubular cells. Rats with persistent proteinuria showed a significantly increased number of terminal dUTP nick-end labeling positive apoptotic cells compared with UNX-controls, both in glomeruli and tubulointerstitium. Double staining for apoptosis and AT2 receptor showed that most terminal dUTP nick-end labeling positive cells were found in tubules expressing AT2 receptor. Using an antibody that recognizes the active form caspase-3, we observed an increment in caspase-3 activation in rats receiving BSA with respect to those receiving saline. Rats with persistent proteinuria showed a diminution in the phosphorylation of Bcl-2 with respect to UNX-controls both at day 8 and day 28. By contrast, no changes were observed either in the Bax or in the Bcl-2 protein levels. The administration of BSA to UNX rats induced a diminution in the phosphorylation of ERK with respect to UNX-control at all times studied. The changes observed in ERK activities took place without alterations of ERK1/2 protein levels. In summary, our data suggest that persistent proteinuria causes apoptosis in tubular cells through the activation of AT2 receptor, which can, in turn, inhibit MAP kinase (ERK1/2) activation and Bcl-2 phosphorylation.
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Affiliation(s)
- Nuria Tejera
- Renal and Vascular Laboratory, Fundación Jiménez Díaz-Universidad Autónoma, Madrid, Spain
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24
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Abstract
The regulation of cell death has been investigated in a number of clinical disorders including renal ischemic and toxic acute renal failure. Caspases play a crucial role in the execution or final phase of cell death by cleaving and inactivating various structural and functional intracellular proteins that are essential for cell survival and proliferation. Evidence is now emerging to implicate the caspase pathway in a variety of renal diseases including the pathogenesis of acute renal failure. Among the 14 known members of the caspase family thus far identified several executioner caspases including caspases-3, -6, and -7 and the proinflammatory caspase including caspase-1 may participate in the final degradation of intracellular proteins. The activation of these caspases is regulated by the receptor- and mitochondrial-mediated cell signaling pathways as well as by the endoplasmic reticulum stress response. While the role of some caspases in renal injury is emerging, the roles of various proinflammatory and other executioner caspases remain to be determined. Although many pro- and anti-apoptotic molecules that act upstream of caspase activation have been identified, their regulation is yet to be determined in the pathogenesis of renal injury. A precise description of caspase-mediated cell death pathway and regulation of caspase activation is, therefore, critical to the understanding of the mechanism of renal injury and to the development of therapeutic targets that prevent renal diseases and preserve renal function.
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Affiliation(s)
- Gur P Kaushal
- Department of Medicine, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA.
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