1
|
González Arbeláez LF, Pardo AC, Burgos JI, Petroff MGV, Coto JG, Ennis IL, Mosca SM, Fantinelli JC. NEW ADVANCES IN THE PROTECTIVE MECHANISMS OF ACIDIC pH AFTER ISCHEMIA: PARTICIPATION OF NO. Arch Biochem Biophys 2024:110059. [PMID: 38936683 DOI: 10.1016/j.abb.2024.110059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2024] [Revised: 06/03/2024] [Accepted: 06/07/2024] [Indexed: 06/29/2024]
Abstract
BACKGROUND It has been previously demonstrated that the maintenance of ischemic acidic pH or the delay of intracellular pH recovery at the onset of reperfusion decreases ischemic-induced cardiomyocyte death. OBJECTIVE To examine the role played by nitric oxide synthase (NOS)/NO-dependent pathways in the effects of acidic reperfusion in a regional ischemia model METHODS: Isolated rat hearts perfused by Langendorff technique were submitted to 40 min of left coronary artery occlusion followed by 60 min of reperfusion (IC). A group of hearts received an acid solution (pH=6.4) during the first 2 min of reperfusion (AR) in absence or in presence of L-NAME (NOS inhibitor). Infarct size (IS) and myocardial function were determined. In cardiac homogenates, the expression of P-Akt, P-endothelial and inducible isoforms of NOS (P-eNOS and iNOS) and the level of 3-nitrotyrosine were measured. In isolated cardiomyocytes, the intracellular NO production was assessed by confocal microscopy, under control and acidic conditions. Mitochondrial swelling after Ca2+ addition and mitochondrial membrane potential (Δψ) were also determined under control and acidosis RESULTS: AR decreased IS, improved postischemic myocardial function recovery, increased P-Akt and P-eNOS, and decreased iNOS and 3-nitrotyrosine. NO production increased while mitochondrial swelling and Δψ decreased in acidic conditions. L-NAME prevented the beneficial effects of AR CONCLUSIONS: Our data strongly supports that a brief acidic reperfusion protects the myocardium against the ischemia-reperfusion injury through eNOS/NO-dependent pathways.
Collapse
Affiliation(s)
| | - Alejandro Ciocci Pardo
- Centro de Investigaciones Cardiovasculares, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina
| | - Juan Ignacio Burgos
- Centro de Investigaciones Cardiovasculares, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina
| | - Martín Gerardo Vila Petroff
- Centro de Investigaciones Cardiovasculares, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina
| | - Joshua Godoy Coto
- Centro de Investigaciones Cardiovasculares, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina
| | - Irene Lucía Ennis
- Centro de Investigaciones Cardiovasculares, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina
| | - Susana María Mosca
- Centro de Investigaciones Cardiovasculares, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina
| | - Juliana Catalina Fantinelli
- Centro de Investigaciones Cardiovasculares, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina.
| |
Collapse
|
2
|
Li S, Zhou Y, Gu X, Zhang X, Jia Z. NLRX1/FUNDC1/NIPSNAP1-2 axis regulates mitophagy and alleviates intestinal ischaemia/reperfusion injury. Cell Prolif 2021; 54:e12986. [PMID: 33432610 PMCID: PMC7941235 DOI: 10.1111/cpr.12986] [Citation(s) in RCA: 44] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 11/17/2020] [Accepted: 12/19/2020] [Indexed: 12/11/2022] Open
Abstract
OBJECTIVES Mitophagy is considered to be a key mechanism in the pathogenesis of intestinal ischaemic reperfusion (IR) injury. NOD-like receptor X1 (NLRX1) is located in the mitochondria and is highly expressed in the intestine, and is known to modulate ROS production, mitochondrial damage, autophagy and apoptosis. However, the function of NLRX1 in intestinal IR injury is unclear. MATERIALS AND METHODS NLRX1 in rats with IR injury or in IEC-6 cells with hypoxia reoxygenation (HR) injury were measured by Western blotting, real-time PCR and immunohistochemistry. The function of NLRX1-FUNDC1-NIPSNAP1/NIPSNAP2 axis in mitochondrial homeostasis and cell apoptosis were assessed in vitro. RESULTS NLRX1 is significantly downregulated following intestinal IR injury. In vivo studies showed that rats overexpressing NLRX1 exhibited resistance against intestinal IR injury and mitochondrial dysfunction. These beneficial effects of NLRX1 overexpression were dependent on mitophagy activation. Functional studies showed that HR injury reduced NLRX1 expression, which promoted phosphorylation of FUN14 domain-containing 1 (FUNDC1). Based on immunoprecipitation studies, it was evident that phosphorylated FUNDC1 could not interact with the mitophagy signalling proteins NIPSNAP1 and NIPSNAP2 on the outer membrane of damaged mitochondria, which failed to launch the mitophagy process, resulting in the accumulation of damaged mitochondria and epithelial apoptosis. CONCLUSIONS NLRX1 regulates mitophagy via FUNDC1-NIPSNAP1/NIPSNAP2 signalling pathway. Thus, this study provides a potential target for the development of a therapeutic strategy for intestinal IR injury.
Collapse
Affiliation(s)
- Shaoqin Li
- Department of Interventional and Vascular SurgeryChangzhou No. 2 People's HospitalChangzhouChina
| | - Yi Zhou
- Department of Interventional and Vascular SurgeryChangzhou No. 2 People's HospitalChangzhouChina
| | - Xiaocheng Gu
- Department of Interventional and Vascular SurgeryChangzhou No. 2 People's HospitalChangzhouChina
| | - Xiaoping Zhang
- Department of Nuclear MedicineShanghai Tenth People's HospitalTongji UniversityShanghaiChina
- Shanghai Center of Thyroid DiseasesTongji University School of MedicineShanghaiChina
| | - Zhongzhi Jia
- Department of Interventional and Vascular SurgeryChangzhou No. 2 People's HospitalChangzhouChina
| |
Collapse
|
3
|
Geng C, Wei J, Wu C. Yap-Hippo pathway regulates cerebral hypoxia-reoxygenation injury in neuroblastoma N2a cells via inhibiting ROCK1/F-actin/mitochondrial fission pathways. Acta Neurol Belg 2020; 120:879-892. [PMID: 29796942 DOI: 10.1007/s13760-018-0944-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Accepted: 05/15/2018] [Indexed: 01/03/2023]
Abstract
Yes-associated protein (Yap), a regulator of cellular apoptosis, has been demonstrated to be involved in cerebral ischemia-reperfusion (IR) injury through poorly defined mechanisms. The present study aimed to explore the role of Yap in regulating cerebral IR injury in vitro, with a focus on mitochondrial fission and ROCK1/F-actin pathways. Our data demonstrated that Yap was actually downregulated in N2a cells after cerebral hypoxia-reoxygenation (HR) injury, and that lower expression of Yap was closely associated with increased cell death. However, the reintroduction of Yap was able to suppress the HR-mediated N2a cells death via blocking the mitochondria-related apoptotic signal. At the molecular levels, Yap overexpression sustained mitochondrial potential, normalized the mitochondrial respiratory function, reduced ROS overproduction, limited HtrA2/Omi release from mitochondria into the nucleus, and suppressed pro-apoptotic proteins activation. Subsequently, functional studies have further illustrated that HR-mediated mitochondrial apoptosis was highly regulated by mitochondrial fission, whereas Yap overexpression was able to attenuate HR-mediated mitochondrial fission and, thus, promote N2a cell survival in the context of HR injury. At last, we demonstrated that Yap handled mitochondrial fission via closing ROCK1/F-actin signaling pathways. Activation of ROCK1/F-actin pathways abrogated the protective role of Yap overexpression on mitochondrial homeostasis and N2a cell survival in the setting of HR injury. Altogether, our data identified Yap as the endogenous defender to relieve HR-mediated nerve damage via antagonizing ROCK1/F-actin/mitochondrial fission pathways.
Collapse
Affiliation(s)
- Chizi Geng
- Physician of Neurology Department, Beijing Luhe Hospital, Capital Medical University, Beijing, China.
| | - Jianchao Wei
- Director of Neurology Department, Beijing Luhe Hospital, Capital Medical University, Beijing, China
| | - Chengsi Wu
- Deputy Director of Eurology Department, Beijing Luhe Hospital, Capital Medical University, Beijing, China
| |
Collapse
|
4
|
Bai J, Wang Q, Qi J, Yu H, Wang C, Wang X, Ren Y, Yang F. Promoting effect of baicalin on nitric oxide production in CMECs via activating the PI3K-AKT-eNOS pathway attenuates myocardial ischemia-reperfusion injury. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2019; 63:153035. [PMID: 31377586 DOI: 10.1016/j.phymed.2019.153035] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Revised: 07/08/2019] [Accepted: 07/19/2019] [Indexed: 06/10/2023]
Abstract
OBJECTIVE Baicalin, which is isolated from Scutellariae Radix, has been shown to possess therapeutic potential for different diseases. Cardiac microvessel injury in myocardial ischemia-reperfusion (IR) has been extensively explored. However, there have been no studies investigating the physiological regulatory mechanisms of baicalin on nitric oxide production and the necroptosis of cardiac microvascular endothelial cells (CMECs) in myocardial IR injury. This study was designed to investigate the contribution of baicalin to repressing necroptosis and preventing IR-mediated CMEC dysfunction. MATERIALS AND METHODS Indicators of ventricular structure and function were measured by an echocardiographic system. An MTT assay was performed to assess cell viability. Nitrite detection was performed to detect nitric oxide content, and cGMP content was determined using a commercially available cGMP complete ELISA kit. Morphology and molecular characteristics were detected by electron micrographs, quantitative real-time polymerase chain reaction (qRT-PCR) and western blotting. RESULT Our results demonstrated that baicalin significantly improved cardiac function, decreased the myocardial infarction area, and inhibited myocardial cell apoptosis. Moreover, baicalin had a protective effect on cardiac microvessels and promoted the production of nitric oxide (NO) and the level of cGMP in rats that underwent myocardial IR injury. The results of the in vitro experiments showed that baicalin markedly improved cell activity and function in CMECs exposed to hypoxia-reoxygenation (HR). Further experiments indicated that baicalin supplementation suppressed the protein expression of RIP1, RIP3 and p-MLKL to interrupt CMEC necroptosis. In addition, baicalin promoted the production of NO via activating the PI3K-AKT-eNOS signaling pathway. Taken together, our results identified the PI3K-AKT-eNOS axis as a new pathway responsible for reperfusion-mediated microvascular damage. CONCLUSION Baicalin protected CMECs in IR rats by promoting the release of NO via the PI3K-AKT-eNOS pathway and mitigated necroptosis by inhibiting the protein expression of RIP1, RIP3 and p-MLKL.
Collapse
Affiliation(s)
- Jiannan Bai
- Department of Cardiology, Daqing People's Hospital, 213 Jianshe Road, Daqing, Heilongjiang 163319, China
| | - Qingchao Wang
- Department of Cardiology, Daqing People's Hospital, 213 Jianshe Road, Daqing, Heilongjiang 163319, China
| | - Jiaxin Qi
- Department of Cardiology, Daqing People's Hospital, 213 Jianshe Road, Daqing, Heilongjiang 163319, China
| | - Hongqiang Yu
- Department of Cardiology, Daqing People's Hospital, 213 Jianshe Road, Daqing, Heilongjiang 163319, China
| | - Cong Wang
- Department of Cardiology, Daqing People's Hospital, 213 Jianshe Road, Daqing, Heilongjiang 163319, China
| | - Xiaowei Wang
- Department of Cardiology, Daqing People's Hospital, 213 Jianshe Road, Daqing, Heilongjiang 163319, China
| | - Yanru Ren
- Department of Anesthesiology, Daqing People's Hospital, Daqing, Heilongjiang 163319, China.
| | - Fude Yang
- Department of Cardiology, Daqing People's Hospital, 213 Jianshe Road, Daqing, Heilongjiang 163319, China.
| |
Collapse
|
5
|
Chen Z, Wang C, Yu N, Si L, Zhu L, Zeng A, Liu Z, Wang X. INF2 regulates oxidative stress-induced apoptosis in epidermal HaCaT cells by modulating the HIF1 signaling pathway. Biomed Pharmacother 2019; 111:151-161. [DOI: 10.1016/j.biopha.2018.12.046] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Revised: 12/10/2018] [Accepted: 12/12/2018] [Indexed: 12/15/2022] Open
|
6
|
Yu W, Xu M, Zhang T, Zhang Q, Zou C. Mst1 promotes cardiac ischemia-reperfusion injury by inhibiting the ERK-CREB pathway and repressing FUNDC1-mediated mitophagy. J Physiol Sci 2019; 69:113-127. [PMID: 29961191 PMCID: PMC10717665 DOI: 10.1007/s12576-018-0627-3] [Citation(s) in RCA: 81] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2018] [Accepted: 06/19/2018] [Indexed: 12/20/2022]
Abstract
Cardiac ischemia-reperfusion (I/R) injury results mainly from mitochondrial dysfunction and cardiomyocyte death. Mitophagy sustains mitochondrial function and exerts a pro-survival effect on the reperfused heart tissue. Mammalian STE20-like kinase 1 (Mst1) regulates chronic cardiac metabolic damage and autophagic activity, but its role in acute cardiac I/R injury, especially its effect on mitophagy, is unknown. The aim of this study is to explore whether Mst1 is involved in reperfusion-mediated cardiomyocyte death via modulation of FUN14 domain containing 1 (FUNDC1)-related mitophagy. Our data indicated that Mst1 was markedly increased in reperfused hearts. However, genetic ablation of Mst1 in Mst1-knockout (Mst1-KO) mice significantly reduced the expansion of the cardiac infarction area, maintained myocardial function and abolished I/R-mediated cardiomyocyte death. At the molecular level, upregulation of Mst1 promoted ROS production, reduced mitochondrial membrane potential, facilitated the leakage of mitochondrial pro-apoptotic factors into the nucleus, and activated the caspase-9-related apoptotic pathway in reperfused cardiomyocytes. Mechanistically, Mst1 activation repressed FUNDC1 expression and consequently inhibited mitophagy. However, deletion of Mst1 was able to reverse FUNDC1 expression and thus re-activate protective mitophagy, effectively sustaining mitochondrial homeostasis and blocking mitochondrial apoptosis in reperfused cardiomyocytes. Finally, we demonstrated that Mst1 regulated FUNDC1 expression via the MAPK/ERK-CREB pathway. Inhibition of the MAPK/ERK-CREB pathway prevented FUNDC1 activation caused by Mst1 deletion. Altogether, our data confirm that Mst1 deficiency sends a pro-survival signal for the reperfused heart by reversing FUNDC1-related mitophagy and thus reducing cardiomyocyte mitochondrial apoptosis, which identifies Mst1 as a novel regulator for cardiac reperfusion injury via modulation of mitochondrial homeostasis.
Collapse
Affiliation(s)
- Wancheng Yu
- Department of Cardiovascular Surgery, Shandong Provincial Hospital Affiliated to Shandong University, NO. 324 Jingwu Road, Jinan, 250021, Shandong, China
| | - Mei Xu
- Department of Geriatrics, Shandong University Qilu Hospital, 107 Wenhua Xi Road, Jinan, 250021, Shandong, China
| | - Tao Zhang
- Department of Cardiovascular Surgery, Shandong Provincial Hospital Affiliated to Shandong University, NO. 324 Jingwu Road, Jinan, 250021, Shandong, China
| | - Qian Zhang
- Department of Cardiovascular Surgery, Shandong Provincial Hospital Affiliated to Shandong University, NO. 324 Jingwu Road, Jinan, 250021, Shandong, China
| | - Chengwei Zou
- Department of Cardiovascular Surgery, Shandong Provincial Hospital Affiliated to Shandong University, NO. 324 Jingwu Road, Jinan, 250021, Shandong, China.
| |
Collapse
|
7
|
Zhang W, Liu K, Pei Y, Ma J, Tan J, Zhao J. Mst1 regulates non-small cell lung cancer A549 cell apoptosis by inducing mitochondrial damage via ROCK1/F‑actin pathways. Int J Oncol 2018; 53:2409-2422. [PMID: 30320378 PMCID: PMC6203146 DOI: 10.3892/ijo.2018.4586] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Accepted: 09/14/2018] [Indexed: 02/06/2023] Open
Abstract
Mammalian STE20-like kinase 1 (Mst1) is well recognized as a major tumor suppressor in cancer development, growth, metabolic reprogramming, metastasis, cell death and recurrence. However, the roles of Mst1 in non-small cell lung cancer (NSCLC) A549 cell phenotypic alterations remain to be elucidated. The present study aimed to explore the functional role and underlying mechanisms of Mst1 with regards to A549 cell proliferation, migration and apoptosis; this study focused on mitochondrial homeostasis and Rho-associated coiled-coil containing protein kinase 1 (ROCK1)/F‑actin pathways. The results demonstrated that Mst1 was downregulated in A549 cells compared with in a normal pulmonary epithelial cell line. Subsequently, overexpression of Mst1 in A549 cells reduced cell viability and promoted cell apoptosis. Furthermore, overexpression of Mst1 suppressed A549 cell proliferation and migration. At the molecular level, the reintroduction of Mst1 in A549 cells led to activation of mitochondrial apoptosis, as evidenced by a reduction in mitochondrial potential, overproduction of ROS, cytochrome c release from the mitochondria into the nucleus, and upregulation of pro-apoptotic protein expression. In addition, Mst1 overexpression was closely associated with impaired mitochondrial respiratory function and suppressed cellular energy metabolism. Functional studies illustrated that Mst1 overexpression activated ROCK1/F-actin pathways, which highly regulate mitochondrial function. Inhibition of ROCK1/F-actin pathways in A549 cells sustained mitochondrial homeostasis, alleviated caspase-9-dependent mitochondrial apoptosis, enhanced cancer cell migration and increased cell proliferation. In conclusion, these data firmly established the regulatory role of Mst1 in NSCLC A549 cell survival via the modulation of ROCK1/F-actin pathways, which may provide opportunities for novel treatment modalities in clinical practice.
Collapse
Affiliation(s)
- Weiqiang Zhang
- Department of Thoracic Surgery, Army General Hospital of PLA, Beijing 100700, P. R. China
| | - Keiqiang Liu
- Department of Thoracic Surgery, Army General Hospital of PLA, Beijing 100700, P. R. China
| | - Yingxin Pei
- Department of Thoracic Surgery, Army General Hospital of PLA, Beijing 100700, P. R. China
| | - Jingbo Ma
- Department of Thoracic Surgery, Army General Hospital of PLA, Beijing 100700, P. R. China
| | - Jiang Tan
- Department of Thoracic Surgery, Army General Hospital of PLA, Beijing 100700, P. R. China
| | - Jing Zhao
- Department of Thoracic Surgery, Army General Hospital of PLA, Beijing 100700, P. R. China
| |
Collapse
|
8
|
Li J, Li N, Yan S, Lu Y, Miao X, Gu Z, Shao Y. Melatonin attenuates renal fibrosis in diabetic mice by activating the AMPK/PGC1α signaling pathway and rescuing mitochondrial function. Mol Med Rep 2018; 19:1318-1330. [PMID: 30535482 DOI: 10.3892/mmr.2018.9708] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2018] [Accepted: 08/30/2018] [Indexed: 11/06/2022] Open
Abstract
Mitochondrial homeostasis is a highly regulated process that serves a critical role in the maintenance of renal structure and function. The growing interest in the field of mitochondrial homeostasis promises to provide more information regarding the mechanisms involved in diabetic renal fibrosis, and aid in the development of novel strategies to combat the disease. In the present study, the effects of melatonin on renal damage in mice with diabetes were evaluated and the underlying mechanisms were investigated. Cellular apoptosis was determined using TUNEL assay and western blotting. Mitochondrial function was measured using fluorescence assay and western blotting. The results indicated that diabetic renal fibrosis was associated with 5'adenosine monophosphate‑activated protein kinase (AMPK) downregulation. However, melatonin administration rescued AMPK activity, reduced diabetic renal fibrosis, alleviated glomerular apoptosis and preserved kidney function. The functional experiments demonstrated that melatonin‑induced AMPK activation enhanced peroxisome proliferator‑activated receptor γ coactivator 1‑α (PGC1α) expression, sustained mitochondrial function and blocked mitochondrial apoptosis, leading to protection of the glomerulus against glucotoxicity. However, loss of AMPK and PGC1α negated the protective effects of melatonin on mitochondrial homeostasis, glomerular survival and diabetic renal fibrosis. In summary, the present study revealed that melatonin rescued impaired mitochondrial function and reduced glomerular apoptosis in the context of diabetic renal fibrosis by activating the AMPK/PGC1α pathway.
Collapse
Affiliation(s)
- Jian Li
- Department of Geriatric Endocrinology, Chinese PLA General Hospital, National Clinical Center of Geriatric Medicine, Beijing 100853, P.R. China
| | - Nan Li
- Department of Geriatric Endocrinology, Chinese PLA General Hospital, National Clinical Center of Geriatric Medicine, Beijing 100853, P.R. China
| | - Shuangtong Yan
- Department of Geriatric Endocrinology, Chinese PLA General Hospital, National Clinical Center of Geriatric Medicine, Beijing 100853, P.R. China
| | - Yanhui Lu
- Department of Geriatric Endocrinology, Chinese PLA General Hospital, National Clinical Center of Geriatric Medicine, Beijing 100853, P.R. China
| | - Xinyu Miao
- Department of Geriatric Endocrinology, Chinese PLA General Hospital, National Clinical Center of Geriatric Medicine, Beijing 100853, P.R. China
| | - Zhaoyan Gu
- Department of Geriatric Endocrinology, Chinese PLA General Hospital, National Clinical Center of Geriatric Medicine, Beijing 100853, P.R. China
| | - Yinghong Shao
- Outpatient Department, Chinese PLA General Hospital, Beijing 100853, P.R. China
| |
Collapse
|
9
|
Xie Y, Lv Y, Zhang Y, Liang Z, Han L, Xie Y. LATS2 promotes apoptosis in non-small cell lung cancer A549 cells via triggering Mff-dependent mitochondrial fission and activating the JNK signaling pathway. Biomed Pharmacother 2018; 109:679-689. [PMID: 30551520 DOI: 10.1016/j.biopha.2018.10.097] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Revised: 10/16/2018] [Accepted: 10/18/2018] [Indexed: 12/12/2022] Open
Abstract
LATS2 is a classical tumor suppressor that affects non-small cell lung cancer proliferation and mobilization. However, its role in lung cancer cell apoptosis is unknown. The aim of our study is to explore whether LATS2 activates mitochondria-related apoptosis in lung cancer cells. In the present study, A549 non-small cell lung cancer cells were transfected with a LATS2 adenovirus to induce LATS2 overexpression. Cell apoptosis was evaluated via the MTT assay, TUNEL staining, western blotting, trypan blue staining and ELISA. Mitochondrial function was measured using an immunofluorescence assay, western blotting and ELISA. The results demonstrated that LATS2 was downregulated in A549 lung cancer cells. Overexpression of LATS2 induced A549 cell apoptosis via activating mitochondrial fission. Subsequently, we confirmed that LATS2 modulated mitochondrial fission via the JNK-Mff signaling pathway. Inhibition of the JNK pathway and/or knockdown of Mff abolished the pro-apoptotic effect of LATS2 on A549 cells. Taken together, our results identified LATS2 as a classical tumor suppressor of lung cancer via triggering mitochondrial fission and activating the JNK-Mff signaling pathway. Our results lay the foundation for detailed study of the molecular mechanisms of LATS2 overexpression and regulation of mitochondrial fission for lung cancer treatment.
Collapse
Affiliation(s)
- Yudong Xie
- Respiratory Medicine Department of Zhou Kou's Center Hospital, Henan Province of China, China.
| | - Yanping Lv
- Respiratory Medicine Department of Zhou Kou's Center Hospital, Henan Province of China, China
| | - Yanli Zhang
- Respiratory Medicine Department of Zhou Kou's Center Hospital, Henan Province of China, China
| | - Zhenzhen Liang
- Respiratory Medicine Department of Zhou Kou's Center Hospital, Henan Province of China, China
| | - Lili Han
- Respiratory Medicine Department of Zhou Kou's Center Hospital, Henan Province of China, China
| | - Yiyang Xie
- Sanquan College, Xinxiang Medicine University, China
| |
Collapse
|
10
|
Li H, Feng J, Zhang Y, Feng J, Wang Q, Zhao S, Meng P, Li J. Mst1 deletion attenuates renal ischaemia-reperfusion injury: The role of microtubule cytoskeleton dynamics, mitochondrial fission and the GSK3β-p53 signalling pathway. Redox Biol 2018; 20:261-274. [PMID: 30384260 PMCID: PMC6205415 DOI: 10.1016/j.redox.2018.10.012] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2018] [Accepted: 10/15/2018] [Indexed: 11/17/2022] Open
Abstract
Despite extensive research that has been carried out over the past three decades in the field of renal ischaemia-reperfusion (I/R) injury, the pathogenic role of mitochondrial fission in renal I/R injury is poorly understood. The aim of our study is to investigate the molecular mechanism by which mammalian STE20-like kinase 1 (Mst1) participates in renal I/R injury through modifying mitochondrial fission, microtubule cytoskeleton dynamics, and the GSK3β-p53 signalling pathway. Our data demonstrated that genetic ablation of Mst1 improved renal function, alleviated reperfusion-mediated tubular epithelial cell apoptosis, and attenuated the vulnerability of kidney to I/R injury. At the molecular level, Mst1 upregulation exacerbated mitochondrial damage, as evidenced by reduced mitochondrial potential, increased ROS generation, more cyt-c liberation from mitochondria into the cytoplasm, and an activated mitochondrial apoptotic pathway. Furthermore, we demonstrated that I/R-mediated mitochondrial damage resulted from mitochondrial fission, and the blockade of mitochondrial fission preserved mitochondrial homeostasis in the I/R setting. Functional studies have discovered that Mst1 regulated mitochondrial fission through two mechanisms: induction of Drp1 phosphorylation and enhancement of F-actin assembly. Activated Mst1 promoted Drp1 phosphorylation at Ser616, contributing to Drp1 translocation from the cytoplasm to the surface of the mitochondria. Additionally, Mst1 facilitated F-actin polymerization, contributing to mitochondrial contraction. Finally, we confirmed that Mst1 regulated Drp1 post-transcriptional modification and F-actin stabilization via the GSK3β-p53 signalling pathway. Inhibition of GSK3β-p53 signalling provided a survival advantage for the tubular epithelial cell in the context of renal I/R injury by repressing mitochondrial fission. Collectively, our study identified Mst1 as the primary pathogenesis for the development and progression of renal I/R injury via activation of fatal mitochondrial fission by modulating Drp1 phosphorylation, microtubule cytoskeleton dynamics, and the GSK3β-p53 signalling pathway. Mst1 deletion sustains renal function after I/R injury. Excessive mitochondrial fission accounts for Mst1-mediated mitochondrial apoptosis. Mst1 enhances reperfusion-mediated mitochondrial fission via Drp1 phosphorylation and F-actin polymerization. Mst1 regulates Drp1 phosphorylation and F-actin polymerization by activating the GSK3β-p53 axis.
Collapse
Affiliation(s)
- Hongyan Li
- Department of Nephrology, Huadu District People's Hospital of Guangzhou, Southern Medical University, Guangzhou 510800, China.
| | - Jianxun Feng
- Department of Nephorology, Xuhui DIstrict Centeral Hospital of Shanghai, Shanghai 20031, China
| | - Yunfang Zhang
- Department of Nephrology, Huadu District People's Hospital of Guangzhou, Southern Medical University, Guangzhou 510800, China
| | - Junxia Feng
- Department of Nephrology, Huadu District People's Hospital of Guangzhou, Southern Medical University, Guangzhou 510800, China
| | - Qi Wang
- Department of Nephrology, Huadu District People's Hospital of Guangzhou, Southern Medical University, Guangzhou 510800, China
| | - Shili Zhao
- Department of Nephrology, Huadu District People's Hospital of Guangzhou, Southern Medical University, Guangzhou 510800, China
| | - Ping Meng
- Department of Nephrology, Huadu District People's Hospital of Guangzhou, Southern Medical University, Guangzhou 510800, China
| | - Jingchun Li
- Department of Nephrology, Huadu District People's Hospital of Guangzhou, Southern Medical University, Guangzhou 510800, China
| |
Collapse
|
11
|
Liu J, Xu Y, Wu Q, Ding Q, Fan W. Sirtuin‑1 protects hair follicle stem cells from TNFα-mediated inflammatory stress via activating the MAPK-ERK-Mfn2 pathway. Life Sci 2018; 212:213-224. [PMID: 30292830 DOI: 10.1016/j.lfs.2018.10.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2018] [Revised: 10/01/2018] [Accepted: 10/03/2018] [Indexed: 01/12/2023]
Abstract
OBJECTIVE Stem cell transplantation is a promising tool to treat burn injuries. However, the inflammatory microenvironment in damaged skin limits the efficiency of stem cell-based therapy via poorly understood mechanisms. The aim of our study is to explore the contribution and mechanism of Sirtuin-1 (Sirt1) in TNFα-mediated inflammatory stress in hair follicle stem cells (HFSCs). METHODS Cellular viability was determined using the MTT assay, TUNEL staining, western blot analysis and LDH release assay. Adenovirus-loaded Sirt1 was transduced into HFSCs to overexpress Sirt1 in the presence of TNFα. Mitochondrial function was determined using JC-1 staining, mitochondrial ROS staining, immunofluorescence staining and western blotting. RESULTS Sirt1 was downregulated in response to the TNFα treatment. Additionally, TNFα stress reduced the viability, mobility and proliferation of HFSCs, and these effects were reversed by the overexpression of Sirt1. At the molecular level, Sirt1 overexpression attenuated TNFα-mediated mitochondrial damage, as evidenced by increased mitochondrial energy metabolism, decreased mitochondrial ROS generation, stabilized mitochondrial potential and blockage of the mitochondrial apoptotic pathway. Furthermore, Sirt1 modulated mitochondrial homeostasis by activating the MAPK-ERK-Mfn2 axis; inhibition of this pathway abrogated the protective effects of Sirt1 on HFSC survival, migration and proliferation. SIGNIFICANCE Based on our results, the inflammatory stress-mediated HFSC injury may be associated with a decrease in Sirt1 expression and subsequent mitochondrial dysfunction. Accordingly, strategies designed to enhance Sirt1 expression would be an effective approach to enhance the survival of HFSCs in the inflammatory microenvironment.
Collapse
Affiliation(s)
- Jingjing Liu
- Department of Dermatology and Venereology, Jiangsu Provincial People's Hospital, First Affiliated Hospital of Nanjing Medical University, 210029, China
| | - Yuxuan Xu
- Department of Dermatology and Venereology, Jiangsu Provincial People's Hospital, First Affiliated Hospital of Nanjing Medical University, 210029, China
| | - Qiaofang Wu
- Department of Dermatology and Venereology, Jiangsu Provincial People's Hospital, First Affiliated Hospital of Nanjing Medical University, 210029, China
| | - Qi Ding
- Department of Dermatology and Venereology, Jiangsu Provincial People's Hospital, First Affiliated Hospital of Nanjing Medical University, 210029, China
| | - Weixin Fan
- Department of Dermatology and Venereology, Jiangsu Provincial People's Hospital, First Affiliated Hospital of Nanjing Medical University, 210029, China.
| |
Collapse
|
12
|
Zhou H, Li D, Zhu P, Ma Q, Toan S, Wang J, Hu S, Chen Y, Zhang Y. Inhibitory effect of melatonin on necroptosis via repressing the Ripk3-PGAM5-CypD-mPTP pathway attenuates cardiac microvascular ischemia-reperfusion injury. J Pineal Res 2018; 65:e12503. [PMID: 29770487 DOI: 10.1111/jpi.12503] [Citation(s) in RCA: 176] [Impact Index Per Article: 29.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Accepted: 04/24/2018] [Indexed: 12/14/2022]
Abstract
The molecular features of necroptosis in cardiac ischemia-reperfusion (IR) injury have been extensively explored. However, there have been no studies investigating the physiological regulatory mechanisms of melatonin acting on necroptosis in cardiac IR injury. This study was designed to determine the role of necroptosis in microvascular IR injury, and investigate the contribution of melatonin in repressing necroptosis and preventing IR-mediated endothelial system collapse. Our results demonstrated that Ripk3 was primarily activated by IR injury and consequently aggravated endothelial necroptosis, microvessel barrier dysfunction, capillary hyperpermeability, the inflammation response, microcirculatory vasospasms, and microvascular perfusion defects. However, administration of melatonin prevented Ripk3 activation and provided a pro-survival advantage for the endothelial system in the context of cardiac IR injury, similar to the results obtained via genetic ablation of Ripk3. Functional investigations clearly illustrated that activated Ripk3 upregulated PGAM5 expression, and the latter increased CypD phosphorylation, which obligated endothelial cells to undergo necroptosis via augmenting mPTP (mitochondrial permeability transition pore) opening. Interestingly, melatonin supplementation suppressed mPTP opening and interrupted endothelial necroptosis via blocking the Ripk3-PGAM5-CypD signal pathways. Taken together, our studies identified the Ripk3-PGAM5-CypD-mPTP axis as a new pathway responsible for reperfusion-mediated microvascular damage via initiating endothelial necroptosis. In contrast, melatonin treatment inhibited the Ripk3-PGAM5-CypD-mPTP cascade and thus reduced cellular necroptosis, conferring a protective advantage to the endothelial system in IR stress. These findings establish a new paradigm in microvascular IR injury and update the concept for cell death management handled by melatonin under the burden of reperfusion attack.
Collapse
Affiliation(s)
- Hao Zhou
- Department of Cardiology, Chinese PLA General Hospital, Beijing, China
| | - Dandan Li
- Department of Cardiology, Chinese PLA General Hospital, Beijing, China
| | - Pingjun Zhu
- Department of Cardiology, Chinese PLA General Hospital, Beijing, China
| | - Qiang Ma
- Department of Cardiology, Chinese PLA General Hospital, Beijing, China
| | - Sam Toan
- Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, California
| | - Jin Wang
- Department of Cardiology, Chinese PLA General Hospital, Beijing, China
| | - Shunying Hu
- Department of Cardiology, Chinese PLA General Hospital, Beijing, China
| | - Yundai Chen
- Department of Cardiology, Chinese PLA General Hospital, Beijing, China
| | - Yingmei Zhang
- Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Fudan University, Shanghai, China
| |
Collapse
|
13
|
Sheng J, Li H, Dai Q, Lu C, Xu M, Zhang J, Feng J. DUSP1 recuses diabetic nephropathy via repressing JNK‐Mff‐mitochondrial fission pathways. J Cell Physiol 2018; 234:3043-3057. [PMID: 30191967 DOI: 10.1002/jcp.27124] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Accepted: 07/05/2018] [Indexed: 12/21/2022]
Affiliation(s)
- Junqin Sheng
- Department of NephrologyXuhui District Central Hospital of ShanghaiShanghai China
| | - Hongyan Li
- Department of NephrologyHuadu District People’s Hospital, Southern Medical UniversityGuangzhou China
| | - Qin Dai
- Department of NephrologyXuhui District Central Hospital of ShanghaiShanghai China
| | - Chang Lu
- Department of NephrologyXuhui District Central Hospital of ShanghaiShanghai China
| | - Min Xu
- Department of NephrologyXuhui District Central Hospital of ShanghaiShanghai China
| | - Jisheng Zhang
- Department of NephrologyXuhui District Central Hospital of ShanghaiShanghai China
| | - Jianxun Feng
- Department of NephrologyXuhui District Central Hospital of ShanghaiShanghai China
| |
Collapse
|
14
|
Ji K, Lin K, Wang Y, Du L, Xu C, He N, Wang J, Liu Y, Liu Q. TAZ inhibition promotes IL-2-induced apoptosis of hepatocellular carcinoma cells by activating the JNK/F-actin/mitochondrial fission pathway. Cancer Cell Int 2018; 18:117. [PMID: 30127666 PMCID: PMC6092825 DOI: 10.1186/s12935-018-0615-y] [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] [Received: 05/24/2018] [Accepted: 08/09/2018] [Indexed: 01/31/2023] Open
Abstract
Background Cytokine-based cancer therapies have attracted a great deal of attention in recent years. Unfortunately, resistance to treatment limits the efficacy of these therapeutics. Therefore, the aim of our study was to explore the mechanism of IL-2-based therapy for hepatocellular carcinoma in an attempt to increase the efficiency of this treatment option. Methods HepG2 cells were treated with IL-2. Then, siRNA against TZA was used to transfected into HepG2 cells. Cellular apoptosis was measured via MTT assay, TUNEL assay and caspase-3 activity. Cellular proliferation was evaluated via EdU assay and western blotting. Cellular migration was detected via Transwell assay. Mitochondrial function was monitored by mitochondrial potential analysis, ROS staining, immunofluorescence and western blotting. Pathway blocker and activator were used to establish the role of JNK/F-actin/mitochondrial fission signaling pathway in HepG2 cells stress response. Results Our study found that IL-2 treatment significantly reduced the viability, mobility and proliferation of HepG2 cells in vitro. We also demonstrated that IL-2 treatment was accompanied by an increase in the expression of transcriptional co-activator with PDZ-binding motif (TAZ). Interestingly, genetic ablation of TAZ in the presence of IL-2 further promoted apoptosis, inhibited mobility, and arrested proliferation in HepG2 cells. At the molecular level, IL-2 administration activated excessive mitochondrial fission via the JNK/F-actin pathway; these effects were further enhanced by TAZ deletion. Mechanistically, TAZ knockdown further increased the expression of mitochondrial fission-related proteins such as Drp1, Mff and Fis. The augmented mitochondrial fission stimulated ROS overproduction, mediated redox imbalance, interrupted mitochondrial energy generation, reduced mitochondrial membrane potential, promoted leakage of the pro-apoptotic molecule cyt-c into the nucleus, and initiated caspase-9-related mitochondrial death. Further, we demonstrated that the anti-proliferative and anti-metastatic effects of IL-2 in HepG2 cells were enhanced by TAZ deletion, suggesting that IL-2 sensitizes HepG2 cells to IL-2-based cytokine therapy. However, JNK/F-actin pathway blockade could abrogate the inhibitory effects of TAZ deletion on HepG2 migration, proliferation and survival. Conclusions Taken together, our data indicate that the anti-tumor effects of IL-2-based therapies may be enhanced by TAZ deletion in a JNK/F-actin pathway-dependent manner. This finding provides a novel combinatorial therapeutic approach for treating hepatocellular carcinoma that might significantly increase the efficacy of cytokine-based therapies in a clinical setting. Electronic supplementary material The online version of this article (10.1186/s12935-018-0615-y) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Kaihua Ji
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin Key Laboratory of Radiation and Molecular Nuclear Medicine, Tianjin, 300192 China
| | - Kaili Lin
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin Key Laboratory of Radiation and Molecular Nuclear Medicine, Tianjin, 300192 China
| | - Yan Wang
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin Key Laboratory of Radiation and Molecular Nuclear Medicine, Tianjin, 300192 China
| | - Liqing Du
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin Key Laboratory of Radiation and Molecular Nuclear Medicine, Tianjin, 300192 China
| | - Chang Xu
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin Key Laboratory of Radiation and Molecular Nuclear Medicine, Tianjin, 300192 China
| | - Ningning He
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin Key Laboratory of Radiation and Molecular Nuclear Medicine, Tianjin, 300192 China
| | - Jinhan Wang
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin Key Laboratory of Radiation and Molecular Nuclear Medicine, Tianjin, 300192 China
| | - Yang Liu
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin Key Laboratory of Radiation and Molecular Nuclear Medicine, Tianjin, 300192 China
| | - Qiang Liu
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin Key Laboratory of Radiation and Molecular Nuclear Medicine, Tianjin, 300192 China
| |
Collapse
|
15
|
Zhou H, Wang J, Zhu P, Zhu H, Toan S, Hu S, Ren J, Chen Y. NR4A1 aggravates the cardiac microvascular ischemia reperfusion injury through suppressing FUNDC1-mediated mitophagy and promoting Mff-required mitochondrial fission by CK2α. Basic Res Cardiol 2018; 113:23. [DOI: 10.1007/s00395-018-0682-1] [Citation(s) in RCA: 247] [Impact Index Per Article: 41.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/17/2018] [Revised: 04/09/2018] [Accepted: 04/30/2018] [Indexed: 12/22/2022]
|
16
|
Vargas LA, Velasquez FC, Alvarez BV. Retraction Note to: Compensatory role of the NBCn1 sodium/bicarbonate cotransporter on Ca 2+-induced mitochondrial swelling in hypertrophic hearts. Basic Res Cardiol 2018; 113:21. [PMID: 29671120 DOI: 10.1007/s00395-018-0680-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
The authors have retracted this article [1] because of modifications in the control lanes of Figs. 2a and 8a of the COX1 blot obtained for 18-week-old rats (rotation, horizontal flipping and re-use of the control lanes for the 35-week-old rats blot). In light of the concerns raised, the conclusions drawn in this article cannot be relied upon.
Collapse
Affiliation(s)
- Lorena A Vargas
- Centro de Investigaciones Cardiovasculares CIC-CONICET, Facultad de Ciencias Médicas, Universidad Nacional de La Plata, Calle 60 y 120, 1900, La Plata, Argentina
| | - Fernanda Carrizo Velasquez
- Centro de Investigaciones Cardiovasculares CIC-CONICET, Facultad de Ciencias Médicas, Universidad Nacional de La Plata, Calle 60 y 120, 1900, La Plata, Argentina
| | - Bernardo V Alvarez
- Centro de Investigaciones Cardiovasculares CIC-CONICET, Facultad de Ciencias Médicas, Universidad Nacional de La Plata, Calle 60 y 120, 1900, La Plata, Argentina.
| |
Collapse
|
17
|
Vargas LA, Velasquez FC, Alvarez BV. Editorial Expression of Concern to: Compensatory role of the NBCn1 sodium/bicarbonate cotransporter on Ca 2+-induced mitochondrial swelling in hypertrophic hearts. Basic Res Cardiol 2018; 113:17. [PMID: 29546624 DOI: 10.1007/s00395-018-0676-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Lorena A Vargas
- Centro de Investigaciones Cardiovasculares CIC-CONICET, Facultad de Ciencias Médicas, Universidad Nacional de La Plata, Calle 60 y 120, 1900, La Plata, Argentina
| | - Fernanda Carrizo Velasquez
- Centro de Investigaciones Cardiovasculares CIC-CONICET, Facultad de Ciencias Médicas, Universidad Nacional de La Plata, Calle 60 y 120, 1900, La Plata, Argentina
| | - Bernardo V Alvarez
- Centro de Investigaciones Cardiovasculares CIC-CONICET, Facultad de Ciencias Médicas, Universidad Nacional de La Plata, Calle 60 y 120, 1900, La Plata, Argentina.
| |
Collapse
|
18
|
Ciocci Pardo A, Díaz RG, González Arbeláez LF, Pérez NG, Swenson ER, Mosca SM, Alvarez BV. Benzolamide perpetuates acidic conditions during reperfusion and reduces myocardial ischemia-reperfusion injury. J Appl Physiol (1985) 2017; 125:340-352. [PMID: 29357509 DOI: 10.1152/japplphysiol.00957.2017] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
During ischemia, increased anaerobic glycolysis results in intracellular acidosis. Activation of alkalinizing transport mechanisms associated with carbonic anhydrases (CAs) leads to myocardial intracellular Ca2+ increase. We characterize the effects of inhibition of CA with benzolamide (BZ) during cardiac ischemia-reperfusion (I/R). Langendorff-perfused isolated rat hearts were subjected to 30 min of global ischemia and 60 min of reperfusion. Other hearts were treated with BZ (5 μM) during the initial 10 min of reperfusion or perfused with acid solution (AR, pH 6.4) during the first 3 min of reperfusion. p38MAPK, a kinase linked to membrane transporters and involved in cardioprotection, was examined in hearts treated with BZ in presence of the p38MAPK inhibitor SB202190 (10 μM). Infarct size (IZ) and myocardial function were assessed, and phosphorylated forms of p38MAPK, Akt, and PKCε were evaluated by immunoblotting. We determined the rate of intracellular pH (pHi) normalization after transient acid loading in the absence and presence of BZ or BZ + SB202190 in heart papillary muscles (HPMs). Mitochondrial membrane potential (ΔΨm), Ca2+ retention capacity and Ca2+-mediated swelling after I/R were also measured. BZ, similarly to AR, reduced IZ, improved postischemic recovery of myocardial contractility, increased phosphorylation of Akt, PKCε, and p38MAPK, and normalized ΔΨm and Ca2+ homeostasis, effects abolished after p38MAPK inhibition. In HPMs, BZ slowed pHi recovery, an effect that was restored after p38MAPK inhibition. We conclude that prolongation of acidic conditions during reperfusion by BZ could be responsible for the cardioprotective benefits of reduced infarction and better myocontractile function, through p38MAPK-dependent pathways. NEW & NOTEWORTHY Carbonic anhydrase inhibition by benzolamide (BZ) maintains acidity, decreases infarct size, and improves postischemic myocardial dysfunction in ischemia-reperfusion (I/R) hearts. Protection afforded by BZ mimicked the beneficial effects elicited by an acidic solution (AR). Increased phosphorylation of p38MAPK occurs in I/R hearts reperfused with BZ or with AR. Mitochondria from I/R hearts possess abnormal Ca2+ handling and a more depolarized membrane potential compared with control hearts, and these changes were restored by treatment with BZ or AR.
Collapse
Affiliation(s)
- Alejandro Ciocci Pardo
- Centro de Investigaciones Cardiovasculares CIC-CONICET, Facultad de Ciencias Médicas, Universidad Nacional de La Plata , La Plata , Argentina
| | - Romina G Díaz
- Centro de Investigaciones Cardiovasculares CIC-CONICET, Facultad de Ciencias Médicas, Universidad Nacional de La Plata , La Plata , Argentina
| | - Luisa F González Arbeláez
- Centro de Investigaciones Cardiovasculares CIC-CONICET, Facultad de Ciencias Médicas, Universidad Nacional de La Plata , La Plata , Argentina
| | - Néstor G Pérez
- Centro de Investigaciones Cardiovasculares CIC-CONICET, Facultad de Ciencias Médicas, Universidad Nacional de La Plata , La Plata , Argentina
| | - Erik R Swenson
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, University of Washington, Department of Veterans Affairs Puget Sound Health Care System , Seattle, Washington
| | - Susana M Mosca
- Centro de Investigaciones Cardiovasculares CIC-CONICET, Facultad de Ciencias Médicas, Universidad Nacional de La Plata , La Plata , Argentina
| | - Bernardo V Alvarez
- Centro de Investigaciones Cardiovasculares CIC-CONICET, Facultad de Ciencias Médicas, Universidad Nacional de La Plata , La Plata , Argentina
| |
Collapse
|