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Nie J, Ma S, Zhang Y, Yu S, Yang J, Li A, Pei D. COPI Vesicle Disruption Inhibits Mineralization via mTORC1-Mediated Autophagy. Int J Mol Sci 2023; 25:339. [PMID: 38203512 PMCID: PMC10779376 DOI: 10.3390/ijms25010339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 12/21/2023] [Accepted: 12/22/2023] [Indexed: 01/12/2024] Open
Abstract
Bone mineralization is a sophisticated regulated process composed of crystalline calcium phosphate and collagen fibril. Autophagy, an evolutionarily conserved degradation system, whereby double-membrane vesicles deliver intracellular macromolecules and organelles to lysosomes for degradation, has recently been shown to play an essential role in mineralization. However, the formation of autophagosomes in mineralization remains to be determined. Here, we show that Coat Protein Complex I (COPI), responsible for Golgi-to-ER transport, plays a pivotal role in autophagosome formation in mineralization. COPI vesicles were increased after osteoinduction, and COPI vesicle disruption impaired osteogenesis. Mechanistically, COPI regulates autophagy activity via the mTOR complex 1 (mTORC1) pathway, a key regulator of autophagy. Inhibition of mTOR1 rescues the impaired osteogenesis by activating autophagy. Collectively, our study highlights the functional importance of COPI in mineralization and identifies COPI as a potential therapeutic target for treating bone-related diseases.
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Affiliation(s)
| | | | | | | | | | | | - Dandan Pei
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi’an Jiaotong University, Xi’an 710004, China
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2
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Li B, Wu J, Bao J, Han X, Shen S, Ye X, Dai J, Wu Z, Niu M, He Y, Ni J, Wen L, Wang X, Hu G. Activation of α7nACh receptor protects against acute pancreatitis through enhancing TFEB-regulated autophagy. Biochim Biophys Acta Mol Basis Dis 2020; 1866:165971. [PMID: 32950676 DOI: 10.1016/j.bbadis.2020.165971] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Revised: 09/10/2020] [Accepted: 09/11/2020] [Indexed: 12/23/2022]
Abstract
Acute pancreatitis (AP) is associated with impaired acinar cell autophagic flux, intracellular zymogen activation, cell necrosis and inflammation. Activation of the cholinergic system of vagus nerve has been shown to attenuate AP, but the effect of organ-intrinsic cholinergic system on pancreatitis remains unknown. In this study, we aim to examine the effect of α7 nicotinic acetylcholine receptor (α7nAChR) stimulation within the pancreas during AP. In vivo, AP was induced by caerulein plus LPS or ethanol plus palmitoleic acid in mice. In vitro, pancreatic acini were isolated and subjected to cholecystokinin (CCK) stimulation. Mice or acini were pre-treated with PNU-282987 (selective α7nAChR agonist) or methyllycaconitine citrate salt (selective α7nAChR antagonist). Pancreatitis severity, acinar cell injury, autophagic flux, and transcription factor EB (TFEB) pathway were analyzed. Both caerulein plus LPS in vivo and CCK in vitro led to an up-regulation of α7nAChR, indicating activation of pancreas-intrinsic α7nAChR signaling during AP. PNU-282987 decreased acinar cell injury, trypsinogen activation and pancreatitis severity. Conversely, methyllycaconitine citrate salt increased acinar cell injury and aggravated AP. Moreover, activation of α7nAChR by PNU-282987 promoted autophagic flux as indicated by reduced p62, increased LysoTracker staining and decreased number of autolysosomes with undegraded contents. Furthermore, PNU-282987 treatment significantly increased TFEB activity in pancreatic acinar cells. α7nAChR activation also attenuated pancreatic inflammation and NF-κB activation. Our results showed that activation of α7nAChR protected against experimental pancreatitis through enhancing TFEB-mediated acinar cell autophagy, suggesting that activation of pancreas-intrinsic α7nAChR may serve as an endogenous protective mechanism during AP.
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Affiliation(s)
- Bin Li
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai key Laboratory of Pancreatic Disease, Institute of Pancreatic Disease, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jianghong Wu
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai key Laboratory of Pancreatic Disease, Institute of Pancreatic Disease, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jingpiao Bao
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai key Laboratory of Pancreatic Disease, Institute of Pancreatic Disease, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xiao Han
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai key Laboratory of Pancreatic Disease, Institute of Pancreatic Disease, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Shuangjun Shen
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai key Laboratory of Pancreatic Disease, Institute of Pancreatic Disease, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xin Ye
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai key Laboratory of Pancreatic Disease, Institute of Pancreatic Disease, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Juanjuan Dai
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai key Laboratory of Pancreatic Disease, Institute of Pancreatic Disease, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zengkai Wu
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai key Laboratory of Pancreatic Disease, Institute of Pancreatic Disease, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Mengya Niu
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai key Laboratory of Pancreatic Disease, Institute of Pancreatic Disease, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yan He
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai key Laboratory of Pancreatic Disease, Institute of Pancreatic Disease, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jianbo Ni
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai key Laboratory of Pancreatic Disease, Institute of Pancreatic Disease, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Li Wen
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai key Laboratory of Pancreatic Disease, Institute of Pancreatic Disease, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
| | - Xingpeng Wang
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai key Laboratory of Pancreatic Disease, Institute of Pancreatic Disease, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
| | - Guoyong Hu
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai key Laboratory of Pancreatic Disease, Institute of Pancreatic Disease, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
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3
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Ye X, Han X, Li B, Dai J, Wu Z, He Y, Wen L, Hu G. Dopamine D2 receptor activator quinpirole protects against trypsinogen activation during acute pancreatitis via upregulating HSP70. Am J Physiol Gastrointest Liver Physiol 2020; 318:G1000-G1012. [PMID: 32308041 DOI: 10.1152/ajpgi.00354.2019] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Trypsinogen activation is the hallmark of acute pancreatitis (AP) independent of intra-acinar NF-κB activation and inflammation. We previously found that dopamine (DA) receptor 2 (DRD2) activation controls inflammation during AP via PP2A-dependent NF-κB activation. In this study, we sought to examine whether DRD2 signaling mediates trypsinogen activation and the underlying mechanisms. Pancreatic acinar cells were stimulated with cholecystokinin-8 in vitro. AP was induced by intraperitoneal injections of caerulein and LPS or l-arginine. Pancreatitis severity was assessed biochemically and histologically. We found that activation of DRD2 by quinpirole, a potent DRD2 agonist, resulted in the reduction of trypsinogen activation and the upregulation of HSP70 in vitro and in vivo. Mechanistically, we found that quinpirole induced dephosphorylation of heat shock factor 1 (HSF1), a master transcription factor of HSP70, leading to increased nuclear translocation of HSF1 in a PP2A-dependent pathway. Furthermore, DRD2 activation restored lysosomal pH and, therefore, maintained lysosomal cathepsin B activity in a HSP70-dependent manner. VER155008, a potent HSP70 antagonist, abolished the protective effects observed with DRD2 activation in vitro and in two experimental models of AP. Our data showed that besides controlling NF-κB activation, DRD2 activation prevented trypsinogen activation during acute pancreatitis via PP2A-dependent upregulation of HSP70 and further support that DRD2 agonist could be a promising therapeutic strategy for treating AP.NEW & NOTEWORTHY The current study demonstrated that activation of DRD2 by quinpirole protects against trypsinogen activation in the in vitro and in vivo setting of acute pancreatitis by upregulating HSP70 and restoring lysosomal degradation via a PP2A-dependent manner, therefore leading to reduced pancreatic injury. These findings provide a new mechanistic insight on the protective effect of DRD2 activation in acute pancreatitis.
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Affiliation(s)
- Xin Ye
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Shanghai Key Laboratory of Pancreatic Disease, Institute of Pancreatic Disease, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xiao Han
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Shanghai Key Laboratory of Pancreatic Disease, Institute of Pancreatic Disease, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Bin Li
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Shanghai Key Laboratory of Pancreatic Disease, Institute of Pancreatic Disease, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Juanjuan Dai
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Shanghai Key Laboratory of Pancreatic Disease, Institute of Pancreatic Disease, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zengkai Wu
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Shanghai Key Laboratory of Pancreatic Disease, Institute of Pancreatic Disease, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yan He
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Shanghai Key Laboratory of Pancreatic Disease, Institute of Pancreatic Disease, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Li Wen
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Shanghai Key Laboratory of Pancreatic Disease, Institute of Pancreatic Disease, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Guoyong Hu
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Shanghai Key Laboratory of Pancreatic Disease, Institute of Pancreatic Disease, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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4
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Miao B, Qi WJ, Zhang SW, Wang H, Wang C, Hu L, Huang GW, Li SR, Wang H. miR-148a suppresses autophagy by down-regulation of IL-6/STAT3 signaling in cerulein-induced acute pancreatitis. Pancreatology 2019; 19:557-565. [PMID: 31122822 DOI: 10.1016/j.pan.2019.04.014] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Revised: 04/24/2019] [Accepted: 04/27/2019] [Indexed: 12/11/2022]
Abstract
Acute pancreatitis (AP) is a type of sterile inflammation of the pancreas, potentially leading to systemic inflammatory response syndrome or multiple organ failure. An emerging evidence that dysfunction of miRNA expression may alter pivotal physiological functions and lead to inflammation infiltration and complication of multiple diseases, including AP. Here, the AP model was successfully replicated using cerulein in vitro and in vivo. RT-qPCR was used to detect low expression of miR-148a in AP. This study verified that IL-6 was a direct target of miR-148a. Over-expression of miR-148a decreased the mRNA and protein levels of IL-6 by RT-qPCR and Elisa. Moreover, over-expression of miR-148a improved the pathological state of AP through H&E and MPO staining and transmission electron microscopy. After over-expressing miR-148a, Western blot and immunohistochemical method were used to confirm the reduction of autophagosomes and autolysosomes, blockade of the levels of p-STAT3, LC3-II, ATG7, ATG4c, Beclin1 and the increased p62 expression in AP. The expression of LAMP-2 was not significantly different. In addition, IL-6 and AG490, the IL-6/STAT3 signaling inhibitor, were used to verify the role of IL-6/STAT3 signaling in the regulation of miR-148a on autophagy in cerulein-induced AP in vitro and in vivo. Taken together, our findings indicate that miR-148a suppresses autophagy via regulating IL-6/STAT3 signaling in cerulein-induced AP in vitro and in vivo. The miR-148a appears to be a promising candidate for the gene therapy of AP.
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Affiliation(s)
- Bin Miao
- Department of Infectious Disease, Beijing Friendship Hospital, Beijing, 100010, China
| | - Wen-Jie Qi
- Department of Infectious Disease, Beijing Friendship Hospital, Beijing, 100010, China.
| | - Shu-Wen Zhang
- Department of Infectious Disease, Beijing Friendship Hospital, Beijing, 100010, China
| | - Hong Wang
- Department of Infectious Disease, Beijing Friendship Hospital, Beijing, 100010, China
| | - Chao Wang
- Department of Infectious Disease, Beijing Friendship Hospital, Beijing, 100010, China
| | - Lan Hu
- Department of Infectious Disease, Beijing Friendship Hospital, Beijing, 100010, China
| | - Guang-Wei Huang
- Department of Infectious Disease, Beijing Friendship Hospital, Beijing, 100010, China
| | - Shi-Rong Li
- Department of Infectious Disease, Beijing Friendship Hospital, Beijing, 100010, China
| | - He Wang
- Department of Infectious Disease, Beijing Friendship Hospital, Beijing, 100010, China
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5
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Kostenko S, Heu CC, Yaron JR, Singh G, de Oliveira C, Muller WJ, Singh VP. c-Src regulates cargo transit via the Golgi in pancreatic acinar cells. Sci Rep 2018; 8:11903. [PMID: 30093675 PMCID: PMC6085363 DOI: 10.1038/s41598-018-30370-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 07/17/2018] [Indexed: 12/11/2022] Open
Abstract
The exocrine pancreatic acinar cell is unique for its rapid protein synthesis and packaging in zymogen granules (ZGs). However, while crucial to the pathogenesis of pancreatitis, the signaling involved in the transit of proteins via the Golgi is poorly understood in these cells. Noting the evidence of c-Src in regulating transit of cargo via the Golgi in other systems, we explored this in acinar cells. Stimulation of ZG formation with dexamethasone activated Src and increased the Golgi area in acinar cells. c-Src localized to the microsomes of acinar cells on immunofluorescence and subcellular fractionation. While other Src family members had no effect on the Golgi markers P115 and GM130, active c-Src increased the Golgi area these stained, extending them into the ER. Src inhibition reduced amylase staining outside the Golgi and increased it in a stack like Golgi morphology. In vivo pharmacologic inhibition or acinar specific genetic deletion of c-Src reduced ZG number and staining of amylase in ZGs along with increasing amylase retention in the microsomal fraction. Morphologically this was associated with smaller Golgi stacks, and dilation of the endoplasmic reticulum. Therefore the role c-Src regulated Golgi function, ZG formation and microsomal zymogen transit in acinar cells needs to be explored in pancreatitis.
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Affiliation(s)
- Sergiy Kostenko
- Department of Medicine, Mayo Clinic, Scottsdale, Arizona, USA
| | - Chan C Heu
- Department of Medicine, Mayo Clinic, Scottsdale, Arizona, USA
| | - Jordan R Yaron
- Department of Medicine, Mayo Clinic, Scottsdale, Arizona, USA
| | - Garima Singh
- Department of Medicine, Mayo Clinic, Scottsdale, Arizona, USA
| | | | - William J Muller
- Goodman Cancer Research Center and Department of Biology, McGill University, Montreal, QC, H3A 1A3, Canada
| | - Vijay P Singh
- Department of Medicine, Mayo Clinic, Scottsdale, Arizona, USA.
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6
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Song Z, Huang Y, Liu C, Lu M, Li Z, Sun B, Zhang W, Xue D. miR-352 participates in the regulation of trypsinogen activation in pancreatic acinar cells by influencing the function of autophagic lysosomes. Oncotarget 2018. [PMID: 29541382 PMCID: PMC5834275 DOI: 10.18632/oncotarget.24220] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
This study was performed to screen miRNAs and mRNAs that are differentially expressed during trypsinogen activation in acute pancreatitis and to verify their role in the process of trypsinogen activation. The function enrichment analysis showed that the functions of miR-352 and its regulatory targets lysosome-associated membrane protein 2 (LAMP2) and cathepsin L1 (CTSL1) were lysosome related. The results of the verification experiment showed that in the TLC-S-treated AR42J (pancreatic cell line) cells, miR-352 expression increased, expression levels of LAMP2 and CTSL1 were significantly reduced, trypsinogen activation was increased, and the autophagy pathway was blocked. In the miR-352 mimic-transfected cells, miR-352 expression increased, expression levels of LAMP2 and CTSL1 were significantly reduced, trypsinogen activation was increased, intracellular lysosomal pH increased, cathepsins L activity decreased and the amount of autophagolysosomes increased. In the miR-352 inhibitor-transfected cells, miR-352 expression was reduced, expression levels of LAMP2 and CTSL1 were significantly increased, trypsinogen activation was decreased, intracellular lysosomal pH decreased, cathepsins L activity increased and the amount of autophagolysosomes decreased. In the process of taurolithocholic acid 3-sulfate (TLC-S) induced trypsinogen activation, overexpression of miR-352 could down-regulate LAMP2 and CTSL1, resulting in the dysfunction of autophagic lysosome. Thus, the autophagy pathway was blocked, and trypsinogen activation was enhanced.
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Affiliation(s)
- Zonggong Song
- Department of General Surgery, The First Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Yongming Huang
- Department of General Surgery, The First Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Chao Liu
- Department of General Surgery, The First Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Ming Lu
- Department of Surgery, David Geffen School of Medicine, University of California at Los Angeles, Los Angeles, CA, USA
| | - Zhituo Li
- Department of General Surgery, The First Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Bei Sun
- Department of General Surgery, The First Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Weihui Zhang
- Department of General Surgery, The First Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Dongbo Xue
- Department of General Surgery, The First Affiliated Hospital of Harbin Medical University, Harbin, China
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7
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Gu G, Chen Y, Duan C, Zhou L, Chen C, Chen J, Cheng J, Shi N, Jin Y, Xi Q, Zhong J. Overexpression of ARF1 is associated with cell proliferation and migration through PI3K signal pathway in ovarian cancer. Oncol Rep 2017; 37:1511-1520. [DOI: 10.3892/or.2017.5388] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Accepted: 12/15/2016] [Indexed: 11/06/2022] Open
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8
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Messenger SW, Thomas DD, Cooley MM, Jones EK, Falkowski MA, August BK, Fernandez LA, Gorelick FS, Groblewski GE. Early to Late Endosome Trafficking Controls Secretion and Zymogen Activation in Rodent and Human Pancreatic Acinar Cells. Cell Mol Gastroenterol Hepatol 2015; 1:695-709. [PMID: 26618189 PMCID: PMC4657148 DOI: 10.1016/j.jcmgh.2015.08.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
BACKGROUND & AIMS Pancreatic acinar cells have an expanded apical endosomal system, the physiological and pathophysiological significance of which is still emerging. Phosphatidylinositol-3,5-bisphosphate (PI(3,5)P2) is an essential phospholipid generated by PIKfyve, which phosphorylates phosphatidylinositol-3-phosphate (PI(3)P). PI(3,5)P2 is necessary for maturation of early endosomes (EE) to late endosomes (LE). Inhibition of EE to LE trafficking enhances anterograde endosomal trafficking and secretion at the plasma membrane by default through a recycling endosome (RE) intermediate. We assessed the effects of modulating PIKfyve activity on apical trafficking and pancreatitis responses in pancreatic acinar cells. METHODS Inhibition of EE to LE trafficking was achieved using pharmacological inhibitors of PIKfyve, expression of dominant negative PIKfyve K1877E, or constitutively active Rab5-GTP Q79L. Anterograde endosomal trafficking was manipulated by expression of constitutively active and dominant negative Rab11a mutants. The effects of these agents on secretion, endolysosomal exocytosis of lysosome associated membrane protein (LAMP1), and trypsinogen activation in response to high-dose CCK-8, bile acids and cigarette toxin was determined. RESULTS PIKfyve inhibition increased basal and stimulated secretion. Adenoviral overexpression of PIKfyve decreased secretion leading to cellular death. Expression of Rab5-GTP Q79L or Rab11a-GTP Q70L enhanced secretion. Conversely, dominant-negative Rab11a-GDP S25N reduced secretion. High-dose CCK inhibited endolysosomal exocytosis that was reversed by PIKfyve inhibition. PIKfyve inhibition blocked intracellular trypsin accumulation and cellular damage responses to high CCK-8, tobacco toxin, and bile salts in both rodent and human acini. CONCLUSIONS These data demonstrate that EE-LE trafficking acutely controls acinar secretion and the intracellular activation of zymogens leading to the pathogenicity of acute pancreatitis.
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Affiliation(s)
- Scott W. Messenger
- Department of Nutritional Sciences, University of Wisconsin, Madison, Wisconsin
| | - Diana D.H. Thomas
- Department of Nutritional Sciences, University of Wisconsin, Madison, Wisconsin
| | - Michelle M. Cooley
- Department of Nutritional Sciences, University of Wisconsin, Madison, Wisconsin
| | - Elaina K. Jones
- Department of Nutritional Sciences, University of Wisconsin, Madison, Wisconsin
| | | | - Benjamin K. August
- Department of Nutritional Sciences, University of Wisconsin, Madison, Wisconsin
| | | | - Fred S. Gorelick
- Department of Internal Medicine, School of Medicine, Yale University, New Haven, Connecticut,Department of Cell Biology, School of Medicine, Yale University, New Haven, Connecticut,Veterans Administration Connecticut Healthcare, West Haven, Connecticut
| | - Guy E. Groblewski
- Department of Nutritional Sciences, University of Wisconsin, Madison, Wisconsin,Correspondence Address correspondence to: Guy E. Groblewski, PhD, University of Wisconsin–Madison, Department of Nutritional Sciences, 1415 Linden Drive, Madison, Wisconsin 53706. fax: (608) 262-5860.University of Wisconsin–MadisonDepartment of Nutritional Sciences1415 Linden DriveMadisonWisconsin 53706
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9
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Ackema KB, Hench J, Böckler S, Wang SC, Sauder U, Mergentaler H, Westermann B, Bard F, Frank S, Spang A. The small GTPase Arf1 modulates mitochondrial morphology and function. EMBO J 2014; 33:2659-75. [PMID: 25190516 DOI: 10.15252/embj.201489039] [Citation(s) in RCA: 72] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
The small GTPase Arf1 plays critical roles in membrane traffic by initiating the recruitment of coat proteins and by modulating the activity of lipid-modifying enzymes. Here, we report an unexpected but evolutionarily conserved role for Arf1 and the ArfGEF GBF1 at mitochondria. Loss of function of ARF-1 or GBF-1 impaired mitochondrial morphology and activity in Caenorhabditis elegans. Similarly, mitochondrial defects were observed in mammalian and yeast cells. In Saccharomyces cerevisiae, aberrant clusters of the mitofusin Fzo1 accumulated in arf1-11 mutants and were resolved by overexpression of Cdc48, an AAA-ATPase involved in ER and mitochondria-associated degradation processes. Yeast Arf1 co-fractionated with ER and mitochondrial membranes and interacted genetically with the contact site component Gem1. Furthermore, similar mitochondrial abnormalities resulted from knockdown of either GBF-1 or contact site components in worms, suggesting that the role of Arf1 in mitochondrial functioning is linked to ER-mitochondrial contacts. Thus, Arf1 is involved in mitochondrial homeostasis and dynamics, independent of its role in vesicular traffic.
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Affiliation(s)
- Karin B Ackema
- Growth and Development, Biozentrum University of Basel, Basel, Switzerland
| | - Jürgen Hench
- Division of Neuropathology, Institute of Pathology, University Hospital Basel, Basel, Switzerland
| | | | - Shyi Chyi Wang
- Institute for Molecular and Cell Biology, Singapore City, Singapore
| | - Ursula Sauder
- Microscopy Center, Biozentrum University of Basel, Basel, Switzerland
| | - Heidi Mergentaler
- Growth and Development, Biozentrum University of Basel, Basel, Switzerland
| | | | - Frédéric Bard
- Institute for Molecular and Cell Biology, Singapore City, Singapore
| | - Stephan Frank
- Division of Neuropathology, Institute of Pathology, University Hospital Basel, Basel, Switzerland
| | - Anne Spang
- Growth and Development, Biozentrum University of Basel, Basel, Switzerland
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10
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Li S, Du L, Zhang L, Hu Y, Xia W, Wu J, Zhu J, Chen L, Zhu F, Li C, Yang S. Cathepsin B contributes to autophagy-related 7 (Atg7)-induced nod-like receptor 3 (NLRP3)-dependent proinflammatory response and aggravates lipotoxicity in rat insulinoma cell line. J Biol Chem 2013; 288:30094-30104. [PMID: 23986436 DOI: 10.1074/jbc.m113.494286] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Impairment of glucose-stimulated insulin secretion caused by the lipotoxicity of palmitate was found in β-cells. Recent studies have indicated that defects in autophagy contribute to pathogenesis in type 2 diabetes. Here, we report that autophagy-related 7 (Atg7) induced excessive autophagic activation in INS-1(823/13) cells exposed to saturated fatty acids. Atg7-induced cathepsin B (CTSB) overexpression resulted in an unexpected significant increase in proinflammatory chemokine and cytokine production levels of IL-1β, monocyte chemotactic protein-1, IL-6, and TNF-α. Inhibition of receptor-interacting protein did not affect the inflammatory response, ruling out involvement of necrosis. CTSB siRNA suppressed the inflammatory response but did not affect apoptosis significantly, suggesting that CTSB was a molecular linker between autophagy and the proinflammatory response. Blocking caspase-3 suppressed apoptosis but did not affect the inflammatory response, suggesting that CTSB induced inflammatory effects independently of apoptosis. Silencing of Nod-like receptor 3 (NLRP3) completely abolished both IL-1β secretion and the down-regulation effects of Atg7-induced CTSB overexpression on glucose-stimulated insulin secretion impairment, thus identifying the NLRP3 inflammasome as an autophagy-responsive element in the pancreatic INS-1(823/13) cell line. Combined together, our results indicate that CTSB contributed to the Atg7-induced NLRP3-dependent proinflammatory response, resulting in aggravation of lipotoxicity, independently of apoptosis in the pancreatic INS-1(823/13) cell line.
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Affiliation(s)
- Shali Li
- From the Department of Cell Biology, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu Province 210046, China
| | - Leilei Du
- From the Department of Cell Biology, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu Province 210046, China
| | - Lu Zhang
- From the Department of Cell Biology, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu Province 210046, China
| | - Yue Hu
- From the Department of Cell Biology, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu Province 210046, China
| | - Wenchun Xia
- From the Department of Cell Biology, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu Province 210046, China
| | - Jia Wu
- From the Department of Cell Biology, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu Province 210046, China
| | - Jing Zhu
- From the Department of Cell Biology, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu Province 210046, China
| | - Lingling Chen
- From the Department of Cell Biology, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu Province 210046, China
| | - Fengqi Zhu
- From the Department of Cell Biology, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu Province 210046, China
| | - Chunxian Li
- From the Department of Cell Biology, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu Province 210046, China
| | - SiJun Yang
- From the Department of Cell Biology, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu Province 210046, China.
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Mishra V, Cline R, Noel P, Karlsson J, Baty CJ, Orlichenko L, Patel K, Trivedi RN, Husain SZ, Acharya C, Durgampudi C, Stolz DB, Navina S, Singh VP. Src Dependent Pancreatic Acinar Injury Can Be Initiated Independent of an Increase in Cytosolic Calcium. PLoS One 2013; 8:e66471. [PMID: 23824669 PMCID: PMC3688910 DOI: 10.1371/journal.pone.0066471] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Accepted: 05/07/2013] [Indexed: 12/12/2022] Open
Abstract
Several deleterious intra-acinar phenomena are simultaneously triggered on initiating acute pancreatitis. These culminate in acinar injury or inflammatory mediator generation in vitro and parenchymal damage in vivo. Supraphysiologic caerulein is one such initiator which simultaneously activates numerous signaling pathways including non-receptor tyrosine kinases such as of the Src family. It also causes a sustained increase in cytosolic calcium- a player thought to be crucial in regulating deleterious phenomena. We have shown Src to be involved in caerulein induced actin remodeling, and caerulein induced changes in the Golgi and post-Golgi trafficking to be involved in trypsinogen activation, which initiates acinar cell injury. However, it remains unclear whether an increase in cytosolic calcium is necessary to initiate acinar injury or if injury can be initiated at basal cytosolic calcium levels by an alternate pathway. To study the interplay between tyrosine kinase signaling and calcium, we treated mouse pancreatic acinar cells with the tyrosine phosphatase inhibitor pervanadate. We studied the effect of the clinically used Src inhibitor Dasatinib (BMS-354825) on pervanadate or caerulein induced changes in Src activation, trypsinogen activation, cell injury, upstream cytosolic calcium, actin and Golgi morphology. Pervanadate, like supraphysiologic caerulein, induced Src activation, redistribution of the F-actin from its normal location in the sub-apical area to the basolateral areas, and caused antegrade fragmentation of the Golgi. These changes, like those induced by supraphysiologic caerulein, were associated with trypsinogen activation and acinar injury, all of which were prevented by Dasatinib. Interestingly, however, pervanadate did not cause an increase in cytosolic calcium, and the caerulein induced increase in cytosolic calcium was not affected by Dasatinib. These findings suggest that intra-acinar deleterious phenomena may be initiated independent of an increase in cytosolic calcium. Other players resulting in acinar injury along with the Src family of tyrosine kinases remain to be explored.
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Affiliation(s)
- Vivek Mishra
- Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - Rachel Cline
- Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - Pawan Noel
- Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - Jenny Karlsson
- Department of Cell Biology and Physiology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - Catherine J. Baty
- Department of Cell Biology and Physiology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - Lidiya Orlichenko
- Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - Krutika Patel
- Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - Ram Narayan Trivedi
- Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - Sohail Z. Husain
- Department of Pediatrics, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, United States of America
| | - Chathur Acharya
- Department of Medicine, University of Pittsburgh Medical Center, Passavant, Pennsylvania, United States of America
| | - Chandra Durgampudi
- Department of Medicine, University of Pittsburgh Medical Center, Passavant, Pennsylvania, United States of America
| | - Donna B. Stolz
- Department of Cell Biology and Physiology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - Sarah Navina
- Department of Pathology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - Vijay P. Singh
- Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
- * E-mail:
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