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Zhao LJ, Wang ZT, Ma YH, Zhang W, Dong Q, Yu JT, Tan L. Associations of the cerebrospinal fluid hepatocyte growth factor with Alzheimer's disease pathology and cognitive function. BMC Neurol 2021; 21:387. [PMID: 34615471 PMCID: PMC8493684 DOI: 10.1186/s12883-021-02356-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2020] [Accepted: 08/16/2021] [Indexed: 11/13/2022] Open
Abstract
Background Hepatocyte growth factor (HGF) plays a role in neuronal survival and development, and has been implicated in neurodegenerative diseases. We sought to examine the associations of the CSF HGF with Alzheimer’s disease (AD) pathology and cognitive function. Methods A total of 238 participants (including 90 cognitively normal (CN) and 148 mild cognitive impairment (MCI)) who had measurements of CSF HGF were included from the Alzheimer’s Disease Neuroimaging Initiative (ADNI) database. Multiple linear regression models were utilized to explore the cross-sectional associations of CSF HGF with AD biomarkers (including Aβ42, pTau, and tTau proteins) in non-demented participants. Moreover, linear mixed-effects regression models were utilized to explore the longitudinal associations of HGF subgroups with cognitive function. Mediation analyses were utilized to explore the mediation effects of AD markers. Results MCI individuals had significantly increased CSF HGF compared with the CN individuals. Results of multiple linear regressions showed significant correlations of CSF HGF with CSF Aβ42, pTau, and tTau in non-demented participants. Higher level of baseline CSF HGF was associated with faster cognitive decline. Influences of the baseline CSF HGF on cognition were partially mediated by Aβ42, pTau, and tTau pathologies. Conclusions High concentrations of HGF in CSF may be related to faster cognitive decline. The cognitive consequences of higher CSF HGF partly stem from AD pathology, which suggests that the CSF HGF may be an attractive biomarker candidate to track AD progression. Supplementary Information The online version contains supplementary material available at 10.1186/s12883-021-02356-9.
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Affiliation(s)
- Li-Jing Zhao
- Department of Neurology, Qingdao Municipal Hospital, Dalian Medical University, Dalian, China
| | - Zuo-Teng Wang
- College of Medicine and Pharmaceutics, Ocean University of China, Qingdao, China
| | - Ya-Hui Ma
- Department of Neurology, Qingdao Municipal Hospital, Qingdao University, Qingdao, China
| | - Wei Zhang
- Department of Neurology, Qingdao Municipal Hospital, Dalian Medical University, Dalian, China
| | - Qiang Dong
- Department of Neurology and Institute of Neurology, Huashan Hospital, Shanghai Medical College, Fudan University, 12th Wulumuqi Zhong Road, Shanghai, 200040, China
| | - Jin-Tai Yu
- Department of Neurology and Institute of Neurology, Huashan Hospital, Shanghai Medical College, Fudan University, 12th Wulumuqi Zhong Road, Shanghai, 200040, China.
| | - Lan Tan
- Department of Neurology, Qingdao Municipal Hospital, Qingdao University, Qingdao, China.
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2
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Pham TL, He J, Kakazu AH, Calandria J, Do KV, Nshimiyimana R, Lam TF, Petasis NA, Bazan HEP, Bazan NG. ELV-N32 and RvD6 isomer decrease pro-inflammatory cytokines, senescence programming, ACE2 and SARS-CoV-2-spike protein RBD binding in injured cornea. Sci Rep 2021; 11:12787. [PMID: 34140611 PMCID: PMC8211643 DOI: 10.1038/s41598-021-92293-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Accepted: 06/04/2021] [Indexed: 12/31/2022] Open
Abstract
The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection that causes coronavirus disease 2019 (COVID-19) has resulted in a pandemic affecting the most vulnerable in society, triggering a public health crisis and economic collapse around the world. Effective treatments to mitigate this viral infection are needed. Since the eye is a route of virus entrance, we use an in vivo rat model of corneal inflammation as well as human corneal epithelial cells (HCEC) in culture challenged with IFNγ as models of the eye surface to study this issue. We explore ways to block the receptor-binding domain (RBD) of SARS-CoV-2 Spike (S) protein to angiotensin-converting enzyme 2 (ACE2). We found that the lipid mediators, elovanoid (ELV)-N32 or Resolvin D6-isomer (RvD6i) decreased the expression of the ACE2 receptor, furin, and integrins in damaged corneas or IFNγ-stimulated HCEC. There was also a concomitant decrease in the binding of Spike RBD with the lipid treatments. Using RNA-seq analysis, we uncovered that the lipid mediators also attenuated the expression of pro-inflammatoy cytokines participating in hyper-inflammation and senescence programming. Thus, the bioactivity of these lipid mediators will contribute to open therapeutic avenues to counteract virus attachment and entrance to the body.
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Affiliation(s)
- Thang L Pham
- Neuroscience Center of Excellence, School of Medicine, Louisiana State University Health New Orleans, 2020 Gravier St., Ste. D, New Orleans, LA, 70112-2223, USA
| | - Jiucheng He
- Neuroscience Center of Excellence, School of Medicine, Louisiana State University Health New Orleans, 2020 Gravier St., Ste. D, New Orleans, LA, 70112-2223, USA
| | - Azucena H Kakazu
- Neuroscience Center of Excellence, School of Medicine, Louisiana State University Health New Orleans, 2020 Gravier St., Ste. D, New Orleans, LA, 70112-2223, USA
| | - Jorgelina Calandria
- Neuroscience Center of Excellence, School of Medicine, Louisiana State University Health New Orleans, 2020 Gravier St., Ste. D, New Orleans, LA, 70112-2223, USA
| | - Khanh V Do
- Neuroscience Center of Excellence, School of Medicine, Louisiana State University Health New Orleans, 2020 Gravier St., Ste. D, New Orleans, LA, 70112-2223, USA
| | - Robert Nshimiyimana
- Department of Chemistry and Loker Hydrocarbon Research Institute, University of Southern California, Los Angeles, CA, USA
| | - Ting F Lam
- Department of Chemistry and Loker Hydrocarbon Research Institute, University of Southern California, Los Angeles, CA, USA
| | - Nicos A Petasis
- Department of Chemistry and Loker Hydrocarbon Research Institute, University of Southern California, Los Angeles, CA, USA
| | - Haydee E P Bazan
- Neuroscience Center of Excellence, School of Medicine, Louisiana State University Health New Orleans, 2020 Gravier St., Ste. D, New Orleans, LA, 70112-2223, USA.
| | - Nicolas G Bazan
- Neuroscience Center of Excellence, School of Medicine, Louisiana State University Health New Orleans, 2020 Gravier St., Ste. D, New Orleans, LA, 70112-2223, USA.
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3
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Pham TL, He J, Kakazu AH, Calandria J, Do KV, Nshimiyimana R, Petasis NA, Bazan HEP, Bazan NG. Elovanoid-N32 or RvD6-isomer decrease ACE2 and binding of S protein RBD after injury or INFγ in the eye. RESEARCH SQUARE 2020:rs.3.rs-55764. [PMID: 32818210 PMCID: PMC7430585 DOI: 10.21203/rs.3.rs-55764/v1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection that causes coronavirus disease 2019 (COVID-19) has resulted in a pandemic affecting the most vulnerable in society, triggering a public health crisis and economic tall around the world. Effective treatments to mitigate this virus infection are needed. Since the eye is a route of virus entrance, we use an in vivo rat model of corneal inflammation as well as human corneal epithelial cells in culture challenged with IFNγ to study this issue. We explore ways to block the receptor-binding domain (RBD) of SARS-CoV-2 spike (S) protein to angiotensin-converting enzyme 2 (ACE2). Elovanoid (ELV)-N32 or Resolvin D6-isomer (RvD6i), among the lipid mediators studied, consistently decreased the expression of the ACE2 receptor, furin, and integrins in damaged corneas or IFNγ stimulated human corneal epithelial cells (HCEC). There was also a concomitant decrease in the binding of spike RBD with the lipid treatments. Concurrently, we uncovered that the lipid mediators also attenuated the expression of cytokines that participate in the cytokine storm, hyper-inflammation and senescence programming. Thus, the bioactivity of these lipid mediators will contribute to opening therapeutic avenues for COVID-19 by counteracting virus attachment and entrance to the eye and other cells and the ensuing disruptions of homeostasis.
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Affiliation(s)
| | - Jiucheng He
- Louisiana State University Health New Orleans
| | | | | | - Khanh V Do
- Louisiana State University Health New Orleans
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4
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Luo JJ, Zhang Y, Sun H, Wei JT, Khalil MM, Wang YW, Dai JF, Zhang NY, Qi DS, Sun LH. The response of glandular gastric transcriptome to T-2 toxin in chicks. Food Chem Toxicol 2019; 132:110658. [PMID: 31299295 DOI: 10.1016/j.fct.2019.110658] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Revised: 06/28/2019] [Accepted: 07/01/2019] [Indexed: 02/07/2023]
Abstract
This study was conducted to determine the effect of T-2 toxin on the transcriptome of the glandular stomach in chicks using RNA-sequencing (RNA-Seq). Four groups of 1-day-old Cobb male broilers (n = 4 cages/group, 6 chicks/cage) were fed a corn-soybean-based diet (control) and control supplemented with T-2 toxin at 1.0, 3.0, and 6.0 mg/kg, respectively, for 2 weeks. The histological results showed that dietary supplementation of T-2 toxin at 3.0 and 6.0 mg/kg induced glandular gastric injury including serious inflammation, increased inflammatory cells, mucosal edema, and necrosis and desquamation of the epithelial cells in the glandular stomach of chicks. RNA-Seq analysis revealed that there were 671, 1393, and 1394 genes displayed ≥2 (P < 0.05) differential expression in the dietary supplemental T-2 toxin at 1.0, 3.0, and 6.0 mg/kg, respectively, compared with the control group. Notably, 204 differently expressed genes had shared similar changes among these three doses of T-2 toxin. GO and KEGG pathway analysis results showed that many genes involved in oxidation-reduction process, inflammation, wound healing/bleeding, and apoptosis/carcinogenesis were affected by T-2 toxin exposure. In conclusion, this study systematically elucidated toxic mechanisms of T-2 toxin on the glandular stomach, which might provide novel ideas to prevent adverse effects of T-2 toxin in chicks.
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Affiliation(s)
- Jing-Jing Luo
- Department of Animal Nutrition and Feed Science, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, 430070, China
| | - Yu Zhang
- Department of Animal Nutrition and Feed Science, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, 430070, China
| | - Hua Sun
- Department of Animal Nutrition and Feed Science, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, 430070, China
| | - Jin-Tao Wei
- Department of Animal Nutrition and Feed Science, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, 430070, China; Key Laboratory of Animal Embryo Engineering and Molecular Breeding of Hubei Province, China
| | | | - You-Wei Wang
- Postgraduate School, Hubei University of Medicine, Shiyan, 442000, Hubei, China
| | - Jie-Fan Dai
- Sichuan Green Food Development Center, Chengdu, 610041, China
| | - Ni-Ya Zhang
- Department of Animal Nutrition and Feed Science, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, 430070, China
| | - De-Sheng Qi
- Department of Animal Nutrition and Feed Science, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, 430070, China
| | - Lv-Hui Sun
- Department of Animal Nutrition and Feed Science, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, 430070, China.
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The Synergistic Combination of Everolimus and Paroxetine Exerts Post-ischemic Neuroprotection In Vitro. Cell Mol Neurobiol 2018; 38:1383-1397. [PMID: 30062636 DOI: 10.1007/s10571-018-0605-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2018] [Accepted: 07/24/2018] [Indexed: 01/08/2023]
Abstract
Ischemic stroke is a debilitating multi-factorial cerebrovascular disorder, representing an area of tremendous unmet medical need. Combination treatment has been proposed as a promising therapeutic approach towards combating ischemic stroke. The present study employs in vitro oxygen glucose deprivation (OGD) model to evaluate the post-ischemic neuroprotective efficacy of Everolimus and Paroxetine, alone and in combination. Post-OGD treatment with Everolimus and Paroxetine, alone or in combination, significantly improved the cell survival (~ 80%) when compared to the cells subjected to ischemic injury alone. The individual neuroprotective doses of Everolimus and Paroxetine were found to be at 6.25 and 25 nM, respectively. Whereas, the synergistic neuroprotective dose for Everolimus:Paroxetine was 2:10 nM, calculated using the Chou-Talalay combination index and other four mathematical models. The synergistic combination dose downregulated neuroinflammatory genes (Tnf-α, Il1b, Nf-κB, and iNos) and upregulated the neuroprotective genes (Bcl-2, Bcl-xl, Hif-1, and Epo). The mitochondrial functioning and ROS neutralizing ability increased with combination treatment. Further, the active role of nitric oxide synthase and calmodulin were revealed while exploring the bio-activity of Everolimus and Paroxetine through network pharmacology. The present study for the first time demonstrates the synergistic post-ischemic neuroprotective efficacy of combination treatment with Everolimus and Paroxetine in vitro. Taken together, these findings clearly suggest that Everolimus in combination with Paroxetine may represent a promising therapeutic strategy for the treatment of ischemic stroke, further supporting the combination treatment strategy for this debilitating disorder.
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Sharma D, Singh P, Singh SS. β-N-oxalyl-L-α,β-diaminopropionic acid induces wound healing by stabilizing HIF-1α and modulating associated protein expression. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2018; 44:9-19. [PMID: 29895497 DOI: 10.1016/j.phymed.2018.04.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Revised: 01/15/2018] [Accepted: 04/09/2018] [Indexed: 06/08/2023]
Abstract
BACKGROUND β-N-oxalyl-L-α,β-diaminopropionic acid (L-ODAP) is a non-protein amino acid with haemostatic property present in Lathyrus sativus. It is considered to be the causative agent of neurolathyrism that occurs upon prolonged overconsumption of Lathyrus sativus seeds. L-ODAP is used as a haemostatic drug in surgical dressings. We previously reported that it can stabilize hypoxia inducible factor (HIF)-1α in normoxic conditions. HYPOTHESIS We hypothesised that L-ODAP might affect wound healing by modulating cellular proliferation, migration and angiogenesis via HIF-1α stabilization. STUDY DESIGN We performed in vitro assays to evaluate wound healing activity of L-ODAP. Further, we prepared pharmaceutical gel containing L-ODAP and checked its effect on healing of full thickness excision wounds using Wistar albino rats. METHODS Effect of L-ODAP on HT1080 cell line proliferation, migration and invasion was investigated. Further, gel containing L-ODAP was applied on full thickness excision wounds of Wistar rats. Western blot and zymography were performed with wound tissue extracts obtained 2 days post-wounding and histological and immunohistochemical analysis with regenerated tissue obtained 10 days post-wounding. Evaluation was made based on wound contraction percentage, histological analysis and protein expression levels. RESULTS L-ODAP significantly (P < 0.05) affected wound healing both in vitro and in vivo. At non-toxic concentrations, it induced cell proliferation, migration, invasion and MMP-2 & -9 expressions. L-ODAP treated wounds healed faster than vehicle treated ones. Significantly higher expression level of HIF-1α, VEGF-A, PDGF-A and matrix metalloproteases were observed in L-ODAP treated wounds. CONCLUSION The present investigation explores potential of L-ODAP as a wound healing agent. L-ODAP positively affected wound healing both in vitro and in vivo and thus could be considered a natural wound healing agent.
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Affiliation(s)
- Deepshikha Sharma
- Department of Biochemistry, Osmania University, Hyderabad, TS, India
| | - Preeti Singh
- Bharati Vidyapeeth Medical College, Pune, Maharashtra, India
| | - Surya S Singh
- Department of Biochemistry, Osmania University, Hyderabad, TS, India.
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Abstract
Epidemiological studies have indicated that smoking is a pivotal risk factor for the progression of several chronic diseases. Nicotine, the addictive component of cigarettes, has powerful pathophysiological properties in the body. Although the effects of cigarette smoking on corneal re-epithelialization have been studied, the effects of nicotine on corneal wound healing-related neovascularization and fibrosis have not been fully demonstrated. The aim of this study was to evaluate the effects of chronic administration of nicotine on corneal wound healing following acute insult induced by an alkali burn. BALB/C female mice randomly received either vehicle (2% saccharin) or nicotine (100 or 200 μg/ml in 2% saccharin) in drinking water ad libitum. After 1 week, animals were re-randomized and the experimental group was subjected to a corneal alkali burn, and then nicotine was administered until day 14 after the alkali burn. A corneal alkali burn model was generated by placing a piece of 2 mm-diameter filter paper soaked in 1N NaOH on the right eye. Histopathological analysis and the expression level of the pro-angiogenic genes vascular endothelial growth factor (VEGF) and matrix metalloproteinase-9 (MMP9) revealed that chronic nicotine administration enhanced alkali burn-induced corneal neovascularization. Furthermore, the mRNA expression of the pro-fibrogenic factors α-smooth muscle actin (αSMA), transforming growth factor-β (TGF-β), and collagen α1 (Col1) was enhanced in the high-concentration nicotine-treated group compared with the vehicle group after corneal injury. Immunohistochemical analysis also showed that the αSMA-positive area was increased in chronic nicotine-treated mice after corneal alkali burn. An in vitro assay found that expression of the α3, α7, and β1 nicotinic acetylcholine receptor (nAChR) subunits was significantly increased by chemical injury in human corneal fibroblast cells. Moreover, alkali-induced fibrogenic gene expression and proliferation of fibroblast cells were further increased by treatment with nicotine and cotinine. The proliferation of such cells induced by treatment of nicotine and cotinine was reduced by inhibition of the PI3K and PKC pathways using specific inhibitors. In conclusion, chronic administration of nicotine accelerated the angiogenic and fibrogenic healing processes in alkali-burned corneal tissue.
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Affiliation(s)
- Jong Won Kim
- Biosafety Research Institute and Laboratory of Pathology (BK21 Plus Program), College of Veterinary Medicine, Chonbuk National University, Iksan, Republic of Korea
| | - Chae Woong Lim
- Biosafety Research Institute and Laboratory of Pathology (BK21 Plus Program), College of Veterinary Medicine, Chonbuk National University, Iksan, Republic of Korea
| | - Bumseok Kim
- Biosafety Research Institute and Laboratory of Pathology (BK21 Plus Program), College of Veterinary Medicine, Chonbuk National University, Iksan, Republic of Korea
- * E-mail:
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Takagi T, Naito Y, Uchiyama K, Mizuhima K, Suzuki T, Horie R, Hirata I, Tsuboi H, Yoshikawa T. Carbon monoxide promotes gastric wound healing in mice via the protein kinase C pathway. Free Radic Res 2016; 50:1098-1105. [DOI: 10.1080/10715762.2016.1189546] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Tomohisa Takagi
- Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Yuji Naito
- Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Kazuhiko Uchiyama
- Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Katsura Mizuhima
- Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Takahiro Suzuki
- Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Ryusuke Horie
- Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Ikuhiro Hirata
- Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Hisato Tsuboi
- Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Toshikazu Yoshikawa
- Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
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Hamasaki H, Honda H, Suzuki SO, Hokama M, Kiyohara Y, Nakabeppu Y, Iwaki T. Down-regulation of MET in hippocampal neurons of Alzheimer's disease brains. Neuropathology 2014; 34:284-90. [DOI: 10.1111/neup.12095] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Accepted: 12/14/2013] [Indexed: 01/04/2023]
Affiliation(s)
- Hideomi Hamasaki
- Department of Neuropathology; Graduate School of Medical Sciences; Kyushu University; Fukuoka Japan
| | - Hiroyuki Honda
- Department of Neuropathology; Graduate School of Medical Sciences; Kyushu University; Fukuoka Japan
| | - Satoshi O. Suzuki
- Department of Neuropathology; Graduate School of Medical Sciences; Kyushu University; Fukuoka Japan
| | - Masaaki Hokama
- Division of Neurofunctional Genomics; Department of Immunobiology and Neuroscience; Medical Institute of Bioregulation; Kyushu University; Fukuoka Japan
| | - Yutaka Kiyohara
- Department of Environmental Medicine; Graduate School of Medical Sciences; Kyushu University; Fukuoka Japan
| | - Yusaku Nakabeppu
- Division of Neurofunctional Genomics; Department of Immunobiology and Neuroscience; Medical Institute of Bioregulation; Kyushu University; Fukuoka Japan
| | - Toru Iwaki
- Department of Neuropathology; Graduate School of Medical Sciences; Kyushu University; Fukuoka Japan
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Chandrasekher G, Pothula S, Maharaj G, Bazan H. Differential effects of hepatocyte growth factor and keratinocyte growth factor on corneal epithelial cell cycle protein expression, cell survival, and growth. Mol Vis 2014; 20:24-37. [PMID: 24426773 PMCID: PMC3888494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Accepted: 01/02/2014] [Indexed: 11/12/2022] Open
Abstract
PURPOSE Hepatocyte growth factor (HGF) and keratinocyte growth factor (KGF) are secreted in the cornea in response to injury. In this study, we investigated the HGF- and KGF-mediated effect on the expression of cell cycle and apoptosis controlling proteins, cell survival, and growth in the corneal epithelium to better understand the possible role of their signaling mechanisms in repairing epithelial injuries. METHODS The cell survival capability of HGF and KGF in epithelial primary cultures was evaluated by using a staurosporine-induced apoptosis model. Apoptosis was quantified with image analysis following nuclear staining with Hoechst fluorescent dye and DNA laddering. Western immunoblotting was used to study the effect of growth factors on the expression of cell cycle- and apoptosis-regulating proteins. RESULTS HGF and KGF protected cells from apoptosis for a short duration (10 h), but only KGF exhibited cell survival capability and maintained cell growth for a longer period (24 h). The onset of apoptosis was accompanied by a significant increase in cell cycle inhibitor p27(kip). HGF and KGF suppressed p27(kip) levels in the apoptosis environment; however, KGF- but not HGF-dependent downregulation in p27(kip) expression was sustained for a longer duration. Inhibition of phosphatidylinositol 3-kinase/Akt activation blocked HGF- and KGF-mediated control of p27(kip) expression. Further, when compared to HGF, the presence of KGF produced significant downregulation of p53 and poly(adenosine diphosphate-ribose) polymerase, the key proteins involved in apoptosis and blocked the degradation of G1/S cell cycle progression checkpoint protein retinoblastoma. HGF and KGF upregulated the levels of p21(cip), cyclins A, D, and E and cyclin-dependent kinases (CDK2 and CDK4) as well, but the KGF-mediated effect on the expression of these molecules lasted longer. CONCLUSIONS Sustained effect of KGF on cell survival and proliferation could be attributed to its ability to inhibit p53, retinoblastoma, caspases, and p27(kip) functions in apoptosis and cell cycle arrest and promote the expression of cell cycle progressing molecules for longer duration. Designing therapeutic strategies targeting cell cycle control through KGF may be beneficial for repairing difficult-to-heal corneal epithelial injuries that require sustained growth and cell survival promoting signals.
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Affiliation(s)
- Gudiseva Chandrasekher
- Department of Pharmaceutical Sciences, College of Pharmacy, South Dakota State University, Brookings, SD,Department of Internal Medicine, Sanford School of Medicine of University of South Dakota, Sioux Falls, SD
| | - Swetha Pothula
- Department of Pharmaceutical Sciences, College of Pharmacy, South Dakota State University, Brookings, SD
| | - Glenn Maharaj
- Department of Pharmaceutical Sciences, College of Pharmacy, South Dakota State University, Brookings, SD
| | - Haydee.E.P. Bazan
- Eye Center and Neuroscience Center, Louisiana State University Health Sciences Center, New Orleans, LA
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Abstract
The protein kinase C (PKC) family of serine/threonine protein kinases is a heterogeneous group of enzymes receiving and integrating signals involved in both normal melanocyte biology and melanoma pathology. Alterations in PKC enzyme expression and activation contribute to the malignant phenotype of melanoma in both oncogenic and tumor suppressive roles. Delineating the diverse and often context-dependent functions of PKC enzymes in melanocyte/melanoma biology is key to capitalize on these kinases as drug targets. This review summarizes several of the diverse functions of PKC in melanocyte and melanoma biology with a focus on PKC enzyme regulation and function.
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Affiliation(s)
- Mitchell F Denning
- Department of Pathology and the Oncology Institute, Loyola University Chicago, Maywood, IL, USA.
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Shen L, Kim SH, Chen CY. Sensitization of human pancreatic cancer cells harboring mutated K-ras to apoptosis. PLoS One 2012; 7:e40435. [PMID: 22848379 PMCID: PMC3405084 DOI: 10.1371/journal.pone.0040435] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2012] [Accepted: 06/06/2012] [Indexed: 12/28/2022] Open
Abstract
Pancreatic cancer is a devastating human malignancy and gain of functional mutations in K-ras oncogene is observed in 75%-90% of the patients. Studies have shown that oncogenic ras is not only able to promote cell growth or survival, but also apoptosis, depending upon circumstances. Using pancreatic cancer cell lines with or without expressing mutated K-ras, we demonstrated that the inhibition of endogenous PKC activity sensitized human pancreatic cancer cells (MIA and PANC-1) expressing mutated K-ras to apoptosis, which had no apoptotic effect on BxPC-3 pancreatic cancer cells that contain a normal Ras as well as human lung epithelial BAES-2B cells. In this apoptotic process, the level of ROS was increased and PUMA was upregulated in a p73-dependent fashion in MIA and PANC-1 cells. Subsequently, caspase-3 was cleaved. A full induction of apoptosis required the activation of both ROS- and p73-mediated pathways. The data suggest that PKC is a crucial factor that copes with aberrant K-ras to maintain the homeostasis of the pancreatic cancer cells harboring mutated K-ras. However, the suppression or loss of PKC disrupts the balance and initiates an apoptotic crisis, in which ROS and p73 appear the potential, key targets.
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Affiliation(s)
- Ling Shen
- Department of Radiation Oncology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Sung-Hoon Kim
- Lab of Angiogenesis and Chemoprevention, Graduate School of East-West Medical Science, Kyunghee University, Seoul, South Korea
| | - Chang Yan Chen
- Department of Radiation Oncology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, United States of America
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Thomason HA, Cooper NH, Ansell DM, Chiu M, Merrit AJ, Hardman MJ, Garrod DR. Direct evidence that PKCα positively regulates wound re-epithelialization: correlation with changes in desmosomal adhesiveness. J Pathol 2012; 227:346-56. [PMID: 22407785 DOI: 10.1002/path.4016] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2011] [Revised: 02/03/2012] [Accepted: 02/24/2012] [Indexed: 12/17/2022]
Abstract
Non-healing wounds cause considerable patient morbidity and represent a significant economic burden. Central to wound repair is re-epithelialization, a crucial process involving the modulation of cell adhesion to allow keratinocyte migration to cover the exposed underlying tissues. The cellular mechanisms regulating the earliest stages of re-epithelialization are unclear. We present the first direct evidence that protein kinase Cα (PKCα) plays an important role in regulating wound re-epithelialization. In PKCα(-/-) mice re-epithelialization is delayed, while in novel bitransgenic mice over-expressing constitutively active PKCα it is accelerated. These effects are not due to changes in keratinocyte proliferation, apoptosis or intrinsic cell motility. Instead, they correlate with changes in desmosomal adhesiveness, delay being preceded by retained desmosomal hyper-adhesiveness and acceleration with a rapid switch to desmosomal Ca(2+) -dependence. We demonstrate mechanistic conservation in acute human wounds where PKCα localizes to wound edge desmosomes, which become Ca(2+) -dependent. However, in chronic wounds PKCα remains cytoplasmic and desmosomes fail to switch from the hyper-adhesive state. These results throw new mechanistic light on the earliest stages of wound re-epithelialization and suggest activation of PKCα as a new therapeutic strategy for non-healing wounds.
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Mediero A, Crooke A, Guzmán-Aránguez A, Pintor J. Phospholipase C/Protein Kinase C pathway is essential for corneal re-epithelialization induced by Ap(4)A. Curr Eye Res 2011; 36:1108-15. [PMID: 21988553 DOI: 10.3109/02713683.2011.614371] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
PURPOSE We have previously demonstrated the importance of P2Y(2) receptors in the corneal re-epithelialization effect triggered by diadenosine tetraphosphate (Ap(4)A). In addition, we have also shown the ERK1/2 and ROCK-I activation in Ap(4)A-wound repair response. Phospholipase C/Protein Kinase C (PLC/PKC) pathway activation has been suggested as a molecular mechanism of growth factors-modulated corneal cell migration and P2Y(2) agonists. Hence, the aim of this study is to investigate the role of PLC/PKC cascade in the modification of re-epithelialization rate triggered by Ap(4)A in an established corneal epithelial cell line (Statens Seruminstitut rabbit cornea [SIRC] cells). METHODS In wounded confluent SIRC cell monolayers and in the presence or absence of Ap(4)A 100 μM, a group of PLC/PKC inhibitors (U73122 3 μM, Staurosporine 1 nM and Bisindolylmaleimide-I 10 μM) and activator (PDBU 1 μM) were assayed and the migration rate was evaluated. Also, the activation of ERK1/2 and ROCK-I was examined by Western blot assay after treatment with or without Ap(4)A, U73122, Staurosporine, Bisindolylmaleimide-I and PDBU. RESULTS Pre-treatment of wounded SIRC cells with PLC/PKC inhibitors significantly diminished the Ap(4)A-stimulated cell migration rate. Furthermore, PLC/PKC inhibitors also reduced ERK1/2 phosphorylation and ROCK-I activation triggered by Ap(4)A. CONCLUSIONS The present study shows the involvement of PLC/PKC pathway in the activation of ERK1/2 and ROCK-I downstream signal transduction pathways stimulated by Ap(4)A/P2Y(2) receptor during corneal epithelial wound repair.
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Affiliation(s)
- Aránzazu Mediero
- Departamento de Bioquímica, EU Óptica, Universidad Complutense de Madrid, Madrid, Spain
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15
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Specific subcellular targeting of PKCα and PKCε in normal and tumoral lactotroph cells by PMA-mitogenic stimulus. J Mol Histol 2010; 40:417-25. [DOI: 10.1007/s10735-010-9255-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2009] [Accepted: 02/09/2010] [Indexed: 10/19/2022]
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Sonkoly E, Wei T, Pavez Loriè E, Suzuki H, Kato M, Törmä H, Ståhle M, Pivarcsi A. Protein kinase C-dependent upregulation of miR-203 induces the differentiation of human keratinocytes. J Invest Dermatol 2010; 130:124-34. [PMID: 19759552 DOI: 10.1038/jid.2009.294] [Citation(s) in RCA: 104] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Terminal differentiation of keratinocytes is a multistep process that requires a coordinated program of gene expression. We aimed to explore the possible involvement of a previously unreported class of non-coding RNA genes, microRNAs (miRNAs) in keratinocyte differentiation by using miRNA expression profiling. Out of 365 miRNAs tested, 7 showed significant change between keratinocytes cultured in low or high calcium concentration. The highest-ranked upregulated gene was miR-203, whose expression was significantly upregulated in response to calcium and other inducers of keratinocyte differentiation such as 12-O-tetradecanoylphorbol-13-acetate (TPA) and vitamin D(3). Differentiation-induced upregulation of miR-203 expression was blocked by treatment with specific inhibitors of protein kinase C (PKC), GF109203X, and Ro31-8220. Moreover, our results showed that the activator protein-1 (AP-1) proteins c-Jun and JunB regulate miR-203 expression in keratinocytes. In contrast to inducers of keratinocyte differentiation, epidermal growth factor and keratinocyte growth factor suppressed miR-203 expression in keratinocytes below the basal level. Overexpression of miR-203 in keratinocytes resulted in enhanced differentiation, whereas inhibition of miR-203 suppressed calcium-induced terminal differentiation as judged by involucrin expression. These results suggest that upregulation of miR-203 in human keratinocytes is required for their differentiation and is dependent on the activation of the PKC/AP-1 pathway.
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Affiliation(s)
- Enikö Sonkoly
- Molecular Dermatology Research Group, Unit of Dermatology and Venerology, Department of Medicine, Center for Molecular Medicine, Karolinska Institutet, Stockholm, Sweden.
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Wang X, Zhou X, Ma J, Tian H, Jiao Y, Zhang R, Huang Z, Xiao J, Zhao B, Qian H, Li X. Effects of Keratinocyte Growth Factor-2 on Corneal Epithelial Wound Healing in a Rabbit Model of Carbon Dioxide Laser Injury. Biol Pharm Bull 2010; 33:971-6. [DOI: 10.1248/bpb.33.971] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Xiaojie Wang
- School of Public Health, Jilin University
- Biopharmaceutics and Bioreactor Research Center, Ministry of Education, Jilin Agriculture University
| | - Xin Zhou
- Biopharmaceutics and Bioreactor Research Center, Ministry of Education, Jilin Agriculture University
| | - Jisheng Ma
- Biopharmaceutics and Bioreactor Research Center, Ministry of Education, Jilin Agriculture University
- School of Public Health, Jilin University
| | - Haishan Tian
- Biopharmaceutics and Bioreactor Research Center, Ministry of Education, Jilin Agriculture University
| | - Yue Jiao
- Biopharmaceutics and Bioreactor Research Center, Ministry of Education, Jilin Agriculture University
| | - Rui Zhang
- Biopharmaceutics and Bioreactor Research Center, Ministry of Education, Jilin Agriculture University
| | - Zhifeng Huang
- Key Laboratory Biotechnology Pharmaceutical Engineering, Wenzhou Medical College
| | - Jian Xiao
- Key Laboratory Biotechnology Pharmaceutical Engineering, Wenzhou Medical College
| | | | - Huanwen Qian
- Institute of Radiation Medicine, The Academy of Military Medical Science
| | - Xiaokun Li
- School of Public Health, Jilin University
- Biopharmaceutics and Bioreactor Research Center, Ministry of Education, Jilin Agriculture University
- Key Laboratory Biotechnology Pharmaceutical Engineering, Wenzhou Medical College
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Saghizadeh M, Kramerov AA, Yu FSX, Castro MG, Ljubimov AV. Normalization of wound healing and diabetic markers in organ cultured human diabetic corneas by adenoviral delivery of c-Met gene. Invest Ophthalmol Vis Sci 2009; 51:1970-80. [PMID: 19933191 DOI: 10.1167/iovs.09-4569] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Purpose. Diabetic corneas display altered basement membrane and integrin markers, increased expression of proteinases, decreased hepatocyte growth factor (HGF) receptor, c-met proto-oncogene, and impaired wound healing. Recombinant adenovirus (rAV)-driven c-met overexpression in human organ-cultured corneas was tested for correction of diabetic abnormalities. Methods. Forty-six human corneas obtained postmortem from 23 donors with long-term diabetes (5 with diabetic retinopathy) were organ cultured and transduced with rAV-expressing c-met gene (rAV-cmet) under the cytomegalovirus promoter at approximately 10(8) plaque-forming units per cornea for 48 hours. Each control fellow cornea received control rAV (rAV expressing the beta-galactosidase gene or vector alone). After an additional 4 to 5 days of incubation, 5-mm epithelial wounds were created with n-heptanol, and healing was monitored. The corneas were analyzed afterward by immunohistochemistry and Western blot analysis. Signaling molecule expression and role was examined by immunostaining, phosphokinase antibody arrays, Western blot analysis, and inhibitor analysis. Results. rAV-cmet transduction led to increased epithelial staining for c-met (total, extracellular, and phosphorylated) and normalization of the patterns of select diabetic markers compared with rAV-vector-transduced control fellow corneas. Epithelial wound healing time in c-met-transduced diabetic corneas decreased twofold compared with rAV-vector-transduced corneas and became similar to normal. c-Met action apparently involved increased activation of p38 mitogen-activated protein kinase. c-Met transduction did not change tight junction protein patterns, suggesting unaltered epithelial barrier function. Conclusions. rAV-driven c-met transduction into diabetic corneas appears to restore HGF signaling, normalize diabetic marker patterns, and accelerate wound healing. c-Met gene therapy could be useful for correcting human diabetic corneal abnormalities.
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Affiliation(s)
- Mehrnoosh Saghizadeh
- Ophthalmology Research Laboratories, Cedars-Sinai Medical Center, Los Angeles, California, USA
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Caino MC, Meshki J, Kazanietz MG. Hallmarks for senescence in carcinogenesis: novel signaling players. Apoptosis 2009; 14:392-408. [DOI: 10.1007/s10495-009-0316-z] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Abstract
Expressed sequence tag (EST), proteomic, and antibody capture assays are revealing a level of tear film protein complexity far greater than previously appreciated. A systems biology approach will be needed to fully appreciate function as tear protein doses fluctuate in time through different conditions. Although consensus is growing on what fully constitutes the human tear proteome, questions remain about the source and significance of the approximately 256 tear proteins designated as "intracellular." Many of these may derive from normal cellular turnover and could therefore be informative. A further >183 are designated as "extracellular." Surprisingly, only 4 to 5% of these appear to be dysregulated in the three forms of dry eye preliminarily examined to date. Some differ and a couple overlap, suggesting that disease-specific signatures could be identified. Future dry eye treatment might include recombinant tear protein rescue as a personalized ophthalmic approach to ocular surface disease.
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Kakazu A, Sharma G, Bazan HEP. Association of protein tyrosine phosphatases (PTPs)-1B with c-Met receptor and modulation of corneal epithelial wound healing. Invest Ophthalmol Vis Sci 2008; 49:2927-35. [PMID: 18579758 DOI: 10.1167/iovs.07-0709] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
PURPOSE The purpose of this study was to investigate the expression and activity of protein tyrosine phosphatases (PTPs) in epithelium during corneal wound healing and to investigate how PTPs regulate activation of the c-Met receptor and the receptor's proximal signaling. METHODS Rabbit corneas were injured by gentle scraping of the surface, leaving the limbal epithelium intact, and epithelium was collected at 1, 2, 3, and 7 days after injury. In organ culture models, epithelium was removed and corneas were incubated with hepatocyte growth factor (HGF), with or without the PTP inhibitor bpV(phen), and the PI-3K inhibitors wortmannin and LY294002. Human corneal epithelial (HCE) cells were stimulated with HGF with or without bpV(phen). Total cell lysates and cytosolic and membrane fractions were analyzed by Western blot. PTP activities were measured with specific substrates. PTP1B and SHP-2 genes were knocked down by interference RNA (siRNA). RESULTS PTP activity and expression increased during wound healing. The most abundant were SHP-2, PTP1B, and PTEN. HGF activated the c-Met receptor in HCE cells up to 30 minutes and was downregulated by 2 hours. Inhibition of PTPs increased HGF-promoted wound healing, HGF-activated phosphorylation of c-Met, and its downstream signal PI-3K/Akt, but not ERK1/2 or p70S6K. PTP1B and SHP-2 were bound to the c-Met. Part of the c-Met was colocalized in the endoplasmic reticulum with PTP1B. PTP1B phosphorylation increased when the c-Met receptor was deactivated, and gene knockdown of PTP1B increased c-Met activation. SHP-2 phosphorylation and binding to c-Met was higher during receptor activation, and SHP-2 gene silencing decreased receptor phosphorylation. CONCLUSIONS Inhibition of PTP activity mimics the effect of HGF by activating the PI-3K/Akt signal involved in wound healing. PTP1B and SHP-2 are bound to the c-Met receptor to control its activity. Although the binding of PTP1B increases when there is a decrease in c-Met activation and acts as a negative regulator of the receptor, the increased binding and phosphorylation of SHP-2 coincide with maximal stimulation of c-Met, acting as a positive regulator.
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Affiliation(s)
- Azucena Kakazu
- Department of Ophthalmology and Neuroscience Center of Excellence, Louisiana State University Health Sciences Center, New Orleans, Louisiana 70112, USA
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Petiti JP, De Paul AL, Gutiérrez S, Palmeri CM, Mukdsi JH, Torres AI. Activation of PKC epsilon induces lactotroph proliferation through ERK1/2 in response to phorbol ester. Mol Cell Endocrinol 2008; 289:77-84. [PMID: 18534741 DOI: 10.1016/j.mce.2008.04.015] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/28/2007] [Revised: 04/09/2008] [Accepted: 04/18/2008] [Indexed: 10/22/2022]
Abstract
The aim of this investigation was to contribute to current knowledge about intracellular mechanisms that are involved in lactotroph cell proliferation, by evaluating the role of PKCalpha, PKCepsilon and extracellular-signal regulated kinase (ERK) 1/2 in response to phorbol 12-myristate13-acetate (PMA). In primary pituitary cultures, the activation of protein kinase C (PKC) by PMA for 15 min stimulated lactotroph proliferation; whereas a prolonged activation for 3-8h diminished this proliferative effect. The use of PMA for 15 min-activated PKCepsilon and ERK1/2, whereas incubation with PMA for 3 h induced PKCalpha activation and attenuated the PMA-triggered phosphorylation of ERK1/2. The following inhibitors: PKCs (bisindolylmaleimide I), PKCepsilon (epsilonV1 peptide) and ERK1/2 (PD98059) prevented the mitogenic activity induced by PMA for 15 min. Lactotroph cells stimulated with PMA for 15 min showed a translocation of PKCepsilon to membrane compartment and nucleus. These results thus establish that PKCepsilon plays an essential role in the lactotroph proliferation induced by PMA by triggering signals that involve ERK1/2 activation.
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Affiliation(s)
- Juan Pablo Petiti
- Centro de Microscopía Electrónica, Facultad de Ciencias Médicas, Universidad Nacional de Córdoba, Haya de la Torre esq. Enrique Barros, 5000 Córdoba, Argentina.
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Akita Y. Protein kinase Cε: multiple roles in the function of, and signaling mediated by, the cytoskeleton. FEBS J 2008; 275:3995-4004. [DOI: 10.1111/j.1742-4658.2008.06557.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Zelenka PS, Arpitha P. Coordinating cell proliferation and migration in the lens and cornea. Semin Cell Dev Biol 2007; 19:113-24. [PMID: 18035561 DOI: 10.1016/j.semcdb.2007.10.001] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2007] [Accepted: 10/01/2007] [Indexed: 10/22/2022]
Abstract
Migration is a complex process for epithelial tissues, because the epithelium must move as an intact sheet to preserve its barrier function. The requirement for structural integrity is met by coupling cell-to-matrix and cell-to-cell adhesion at the cellular level, and by coordinating cell proliferation and cell migration in the tissue as a whole. Proliferation is suppressed at the migrating cell front, allowing cells in this region to remain tightly packed while advancing rapidly. At the same time, proliferation is enhanced in a region behind the advancing cell front to expand the epithelial cell sheet. This review considers the extracellular signals and intracellular signaling pathways that regulate these processes in the lens and corneal epithelium, with emphasis on the commonalities that link these tissues.
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Affiliation(s)
- P S Zelenka
- National Eye Institute, NIH, Bethesda, MD 20892, USA.
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