1
|
Liu J, Zhang Y, Liu M, Shi F, Cheng B. AG1024, an IGF-1 receptor inhibitor, ameliorates renal injury in rats with diabetic nephropathy via the SOCS/JAK2/STAT pathway. Open Med (Wars) 2023; 18:20230683. [PMID: 37034500 PMCID: PMC10080708 DOI: 10.1515/med-2023-0683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 02/22/2023] [Accepted: 03/02/2023] [Indexed: 04/11/2023] Open
Abstract
Insulin-like-growth factor-1 (IGF-1) is the ligand for insulin-like growth factor-1 receptor (IGF-1R), and the roles of IGF-1/IGF-1R in diabetic nephropathy (DN) are well-characterized previously. However, the biological functions of AG1024 (an IGF-1R inhibitor) in DN remain unknown. This study investigates the roles and related mechanisms of AG-1024 in DN. The experimental DN was established via intraperitoneal injection of streptozotocin, and STZ-induced diabetic rats were treated with AG1024 (20 mg/kg/day) for 8 weeks. The 24 h proteinuria, blood glucose level, serum creatinine, and blood urea nitrogen were measured for biochemical analyses. The increase in 24 h proteinuria, blood glucose level, serum creatinine, and blood urea of DN rats were conspicuously abated by AG1024. After biochemical analyses, the renal tissue specimens were collected, and as revealed by hematoxylin and eosin staining and Masson staining, AG-1024 mitigated typical renal damage and interstitial fibrosis in DN rats. Then, the anti-inflammatory effect of AG-1024 was assessed by western blotting and ELISA. Mechanistically, AG-1024 upregulated SOCS1 and SOCS3 expression and decreased phosphorylated JAK2, STAT1, and STAT3, as shown by western blotting. Collectively, AG-1024 (an IGF-1R inhibitor) ameliorates renal injury in experimental DN by attenuating renal inflammation and fibrosis via the SOCS/JAK2/STAT pathway.
Collapse
Affiliation(s)
- Jianhua Liu
- Department of Nephrology, The Sixth Hospital of Wuhan (Affiliated Hospital of Jianghan University), Wuhan 430015, Hubei, China
| | - Yun Zhang
- Department of Nephrology, The Sixth Hospital of Wuhan (Affiliated Hospital of Jianghan University), Wuhan 430015, Hubei, China
| | - Min Liu
- Department of Nephrology, The Sixth Hospital of Wuhan (Affiliated Hospital of Jianghan University), Wuhan 430015, Hubei, China
| | - Feng Shi
- Department of Nephrology, The Sixth Hospital of Wuhan (Affiliated Hospital of Jianghan University), Wuhan 430015, Hubei, China
| | - Bo Cheng
- Department of Nephrology, The Sixth Hospital of Wuhan (Affiliated Hospital of Jianghan University), No. 168, Hong Kong Road, Jiang’an District, Wuhan 430015, Hubei, China
| |
Collapse
|
2
|
Yu Y, Wei SG, Weiss RM, Felder RB. Silencing Epidermal Growth Factor Receptor in Hypothalamic Paraventricular Nucleus Reduces Extracellular Signal-regulated Kinase 1 and 2 Signaling and Sympathetic Excitation in Heart Failure Rats. Neuroscience 2021; 463:227-237. [PMID: 33540053 DOI: 10.1016/j.neuroscience.2021.01.025] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 01/12/2021] [Accepted: 01/13/2021] [Indexed: 12/29/2022]
Abstract
Activation of extracellular signal-regulated kinase 1 and 2 (ERK1/2) signaling in cardiovascular regulatory regions of the brain contributes to sympathetic excitation in myocardial infarction (MI)-induced heart failure (HF) by increasing brain renin-angiotensin system (RAS) activity, neuroinflammation, and endoplasmic reticulum (ER) stress. The mechanisms eliciting brain ERK1/2 signaling in HF are still poorly understood. We tested the involvement of the epidermal growth factor receptor (EGFR) which, upon activation, stimulates ERK1/2 activity. Adult male Sprague-Dawley rats received bilateral microinjections of a lentiviral vector encoding a small interfering RNA (siRNA) for EGFR, or a scrambled siRNA, into the hypothalamic paraventricular nucleus (PVN), a recognized source of sympathetic overactivity in HF. One week later, coronary artery ligation was performed to induce HF. Four weeks later, the EGFR siRNA-treated HF rats, compared with the scrambled siRNA-treated HF rats, had lower mRNA and protein levels of EGFR, lower levels of phosphorylated (p-) EGFR and p-ERK1/2 and lower mRNA levels of the inflammatory mediators TNF-α, IL-1β and cyclooxygenase-2, the RAS components angiotensin-converting enzyme and angiotensin II type 1a receptor and the ER stress markers BIP and ATF4 in the PVN. They also had lower plasma and urinary norepinephrine levels and improved peripheral manifestations of HF. Additional studies revealed that p-EGFR was increased in the PVN of HF rats, compared with sham-operated control rats. These results suggest that activation of EGFR in the PVN triggers ERK1/2 signaling, along with ER stress, neuroinflammation and RAS activity, in MI-induced HF. Brain EGFR may be a novel target for therapeutic intervention in MI-induced HF.
Collapse
Affiliation(s)
- Yang Yu
- Department of Internal Medicine, Roy J and Lucille A Carver College of Medicine, University of Iowa, Iowa City, IA, USA
| | - Shun-Guang Wei
- Department of Internal Medicine, Roy J and Lucille A Carver College of Medicine, University of Iowa, Iowa City, IA, USA
| | - Robert M Weiss
- Department of Internal Medicine, Roy J and Lucille A Carver College of Medicine, University of Iowa, Iowa City, IA, USA
| | - Robert B Felder
- Department of Internal Medicine, Roy J and Lucille A Carver College of Medicine, University of Iowa, Iowa City, IA, USA; VA Medical Center, Iowa City, IA, USA.
| |
Collapse
|
3
|
Song L, Liu Z, Hu HH, Yang Y, Li TY, Lin ZZ, Ye J, Chen J, Huang X, Liu DT, Zhou J, Shi Y, Zhao H, Xie C, Chen L, Song E, Lin SY, Lin SC. Proto-oncogene Src links lipogenesis via lipin-1 to breast cancer malignancy. Nat Commun 2020; 11:5842. [PMID: 33203880 PMCID: PMC7672079 DOI: 10.1038/s41467-020-19694-w] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Accepted: 09/21/2020] [Indexed: 02/06/2023] Open
Abstract
Increased lipogenesis has been linked to an increased cancer risk and poor prognosis; however, the underlying mechanisms remain obscure. Here we show that phosphatidic acid phosphatase (PAP) lipin-1, which generates diglyceride precursors necessary for the synthesis of glycerolipids, interacts with and is a direct substrate of the Src proto-oncogenic tyrosine kinase. Obesity-associated microenvironmental factors and other Src-activating growth factors, including the epidermal growth factor, activate Src and promote Src-mediated lipin-1 phosphorylation on Tyr398, Tyr413 and Tyr795 residues. The tyrosine phosphorylation of lipin-1 markedly increases its PAP activity, accelerating the synthesis of glycerophospholipids and triglyceride. Alteration of the three tyrosine residues to phenylalanine (3YF-lipin-1) disables lipin-1 from mediating Src-enhanced glycerolipid synthesis, cell proliferation and xenograft growth. Re-expression of 3YF-lipin-1 in PyVT;Lpin1-/- mice fails to promote progression and metastasis of mammary tumours. Human breast tumours exhibit increased p-Tyr-lipin-1 levels compared to the adjacent tissues. Importantly, statistical analyses show that levels of p-Tyr-lipin-1 correlate with tumour sizes, lymph node metastasis, time to recurrence and survival of the patients. These results illustrate a direct lipogenesis-promoting role of the pro-oncogenic Src, providing a mechanistic link between obesity-associated mitogenic signaling and breast cancer malignancy.
Collapse
Affiliation(s)
- Lintao Song
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, 361102, Fujian, China
| | - Zhihua Liu
- Center of Intestinal Barrier and Fecal Microbiota Transplantation, The Fifth Affiliated Hospital of Guangzhou Medical University, 510700, Guangdong, China
| | - Hui-Hui Hu
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, 361102, Fujian, China
| | - Ying Yang
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, 361102, Fujian, China
| | - Terytty Yang Li
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, 361102, Fujian, China
| | - Zhi-Zhong Lin
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, 361102, Fujian, China
| | - Jing Ye
- Department of Pathology, Xijing Hospital, Fourth Military Medical University, 710000, Shaanxi, China
| | - Jianing Chen
- Breast Tumor Center, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, 510120, Guangzhou, China
| | - Xi Huang
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, 361102, Fujian, China
| | - Dong-Tai Liu
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, 361102, Fujian, China
| | - Jing Zhou
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, 361102, Fujian, China
| | - Yiran Shi
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, 361102, Fujian, China
| | - Hao Zhao
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, 361102, Fujian, China
| | - Changchuan Xie
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, 361102, Fujian, China
| | - Lanfen Chen
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, 361102, Fujian, China
| | - Erwei Song
- Breast Tumor Center, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, 510120, Guangzhou, China
| | - Shu-Yong Lin
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, 361102, Fujian, China
| | - Sheng-Cai Lin
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, 361102, Fujian, China.
| |
Collapse
|
4
|
Role of Epidermal Growth Factor Receptor (EGFR) and Its Ligands in Kidney Inflammation and Damage. Mediators Inflamm 2018; 2018:8739473. [PMID: 30670929 PMCID: PMC6323488 DOI: 10.1155/2018/8739473] [Citation(s) in RCA: 81] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Revised: 10/29/2018] [Accepted: 11/07/2018] [Indexed: 12/29/2022] Open
Abstract
Chronic kidney disease (CKD) is characterized by persistent inflammation and progressive fibrosis, ultimately leading to end-stage renal disease. Although many studies have investigated the factors involved in the progressive deterioration of renal function, current therapeutic strategies only delay disease progression, leaving an unmet need for effective therapeutic interventions that target the cause behind the inflammatory process and could slow down or reverse the development and progression of CKD. Epidermal growth factor receptor (EGFR) (ERBB1), a membrane tyrosine kinase receptor expressed in the kidney, is activated after renal damage, and preclinical studies have evidenced its potential as a therapeutic target in CKD therapy. To date, seven official EGFR ligands have been described, including epidermal growth factor (EGF) (canonical ligand), transforming growth factor-α, heparin-binding epidermal growth factor, amphiregulin, betacellulin, epiregulin, and epigen. Recently, the connective tissue growth factor (CTGF/CCN2) has been described as a novel EGFR ligand. The direct activation of EGFR by its ligands can exert different cellular responses, depending on the specific ligand, tissue, and pathological condition. Among all EGFR ligands, CTGF/CCN2 is of special relevance in CKD. This growth factor, by binding to EGFR and downstream signaling pathway activation, regulates renal inflammation, cell growth, and fibrosis. EGFR can also be “transactivated” by extracellular stimuli, including several key factors involved in renal disease, such as angiotensin II, transforming growth factor beta (TGFB), and other cytokines, including members of the tumor necrosis factor superfamily, showing another important mechanism involved in renal pathology. The aim of this review is to summarize the contribution of EGFR pathway activation in experimental kidney damage, with special attention to the regulation of the inflammatory response and the role of some EGFR ligands in this process. Better insights in EGFR signaling in renal disease could improve our current knowledge of renal pathology contributing to therapeutic strategies for CKD development and progression.
Collapse
|
5
|
Mitsuishi Y, Shibata H, Kurihara I, Kobayashi S, Yokota K, Murai-Takeda A, Hayashi T, Jo R, Nakamura T, Morisaki M, Itoh H. Epidermal growth factor receptor/extracellular signal-regulated kinase pathway enhances mineralocorticoid receptor transcriptional activity through protein stabilization. Mol Cell Endocrinol 2018; 473:89-99. [PMID: 29391190 DOI: 10.1016/j.mce.2018.01.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Revised: 01/12/2018] [Accepted: 01/16/2018] [Indexed: 12/14/2022]
Abstract
Activation of mineralocorticoid receptor (MR) is evoked by aldosterone, and it induces hypertension and cardiovascular disease when it's concomitant with excessive salt loading. We have proposed the notion of "MR-associated hypertension", in which add-on therapy of MR blockers is effective even though serum aldosterone level is within normal range. To elucidate its underlying molecular mechanism, we focused on the effect of epidermal growth factor receptor (EGFR)/extracellular signal-regulated kinase (ERK) activation on MR activity. Epidermal growth factor (EGF) administration increased MR transcriptional activity through EGFR/ERK pathway and increased protein level by counteracting MR ubiquitylation in vitro. EGF administration in vivo also increased MR protein level and target gene expression in kidney, which were decreased by EGFR inhibitor. In addition, the administration of EGFR inhibitor lowered systolic blood pressure and MR activity in DOCA/salt-treated mice. In conclusion, EGFR/ERK pathway activation is considered as one of the underlying mechanisms of aberrant MR activation and EGFR/ERK pathway blockade could be an alternative approach for the prevention of MR-related cardiovascular events.
Collapse
Affiliation(s)
- Yuko Mitsuishi
- Department of Internal Medicine, School of Medicine, Keio University, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
| | - Hirotaka Shibata
- Department of Internal Medicine, School of Medicine, Keio University, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan; Department of Endocrinology, Metabolism, Rheumatology and Nephrology, Faculty of Medicine, Oita University, 1-1 Idaigaoka, Hasamamachi, Yufu 879-5593, Oita, Japan.
| | - Isao Kurihara
- Department of Internal Medicine, School of Medicine, Keio University, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
| | - Sakiko Kobayashi
- Department of Internal Medicine, School of Medicine, Keio University, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
| | - Kenichi Yokota
- Department of Internal Medicine, School of Medicine, Keio University, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
| | - Ayano Murai-Takeda
- Department of Internal Medicine, School of Medicine, Keio University, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
| | - Takeshi Hayashi
- Department of Internal Medicine, School of Medicine, Keio University, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan; Division of Diabetes Metabolism and Endocrinology, Department of Internal Medicine, The Jikei University School of Medicine, 3-19-18 Nishishimbashi, Minato-ku, Tokyo 105-8471, Japan
| | - Rie Jo
- Department of Internal Medicine, School of Medicine, Keio University, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
| | - Toshifumi Nakamura
- Department of Internal Medicine, School of Medicine, Keio University, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
| | - Mitsuha Morisaki
- Department of Internal Medicine, School of Medicine, Keio University, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
| | - Hiroshi Itoh
- Department of Internal Medicine, School of Medicine, Keio University, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
| |
Collapse
|
6
|
Affiliation(s)
- Milton Packer
- Baylor Heart and Vascular Institute, Baylor University Medical Center, Dallas, TX
| |
Collapse
|
7
|
Mali V, Haddox S, Hornersmith C, Matrougui K, Belmadani S. Essential role for EGFR tyrosine kinase and ER stress in myocardial infarction in type 2 diabetes. Pflugers Arch 2017; 470:471-480. [PMID: 29288332 DOI: 10.1007/s00424-017-2097-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Revised: 12/05/2017] [Accepted: 12/17/2017] [Indexed: 12/11/2022]
Abstract
We previously reported that EGFR tyrosine kinase (EGFRtk) activity and endoplasmic reticulum (ER) stress are enhanced in type 2 diabetic (T2D) mice and cause vascular dysfunction. In the present study, we determined the in vivo contribution of EGFRtk and ER stress in acute myocardial infarction induced by acute ischemia (40 min)-reperfusion (24 h) (I/R) injury in T2D (db-/db-) mice. We treated db-/db- mice with EGFRtk inhibitor (AG1478, 10 mg/kg/day) for 2 weeks. Mice were then subjected to myocardial I/R injury. The db-/db- mice developed a significant infarct after I/R injury. The inhibition of EGFRtk significantly reduced the infarct size and ER stress induction. We also determined that the inhibition of ER stress (tauroursodeoxycholic acid, TUDCA, 150 mg/kg per day) in db-/db- significantly decrease the infarct size indicating that ER stress is a downstream mechanism to EGFRtk. Moreover, AG1478 and TUDCA reduced myocardium p38 and ERK1/2 MAP-kinases activity, and increased the activity of the pro-survival signaling cascade Akt. Additionally, the inhibition of EGFRtk and ER stress reduced cell apoptosis and the inflammation as indicated by the reduction in macrophages and neutrophil infiltration. We determined for the first time that the inhibition of EGFRtk protects T2D heart against I/R injury through ER stress-dependent mechanism. The cardioprotective effect of EGFRtk and ER stress inhibition involves the activation of survival pathway, and inhibition of apoptosis, and inflammation. Thus, targeting EGFRtk and ER stress has the potential for therapy to overcome myocardial infarction in T2D.
Collapse
Affiliation(s)
- Vishal Mali
- Department of Physiological Sciences, EVMS, Norfolk, VA, 23501, USA
| | - Samuel Haddox
- Department of Physiological Sciences, EVMS, Norfolk, VA, 23501, USA
| | | | - Khalid Matrougui
- Department of Physiological Sciences, EVMS, Norfolk, VA, 23501, USA
| | - Souad Belmadani
- Department of Physiological Sciences, EVMS, Norfolk, VA, 23501, USA.
| |
Collapse
|
8
|
Ray A. Tumor-linked HER2 expression: association with obesity and lipid-related microenvironment. Horm Mol Biol Clin Investig 2017; 32:/j/hmbci.ahead-of-print/hmbci-2017-0020/hmbci-2017-0020.xml. [PMID: 29087955 DOI: 10.1515/hmbci-2017-0020] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Accepted: 09/08/2017] [Indexed: 02/07/2023]
Abstract
Obesity is associated with the risk of several health disorders including certain cancers. Among obesity-related cancers, postmenopausal breast carcinoma is a well-studied one. Apart from an increase in certain types of lipids in obesity, excess adipose tissue releases many hormone-like cytokines/adipokines, which are usually pro-inflammatory in nature. Leptin is one of such adipokines and significantly linked with the intracellular signaling pathways of other growth factors such as insulin-like growth factor-1 (IGF-1), vascular endothelial growth factor (VEGF), human epidermal growth factor receptor 2 (HER2). In general, HER2 is overexpressed in roughly 30% of breast carcinomas; its presence indicates aggressive tumor behavior. Conversely, HER2 has certain effects in normal conditions such as differentiation of preadipocytes, cardiovascular health and vitamin D metabolism. HER2 has no known endogenous ligand, but it may form dimers with other three members of the epidermal growth factor receptor (EGFR) family and can activate downstream signaling pathways. Furthermore, HER2 is intimately connected with several enzymes, e.g. fatty acid synthase (FASN), phosphatidylinositol 3-kinase (PI3K), AKT and mechanistic target of rapamycin (mTOR), all of which play significant regulatory roles in lipogenic pathways or lipid metabolism. In obesity-related carcinogenesis, characteristics like insulin resistance and elevated IGF-1 are commonly observed. Both IGF-1 and leptin can modulate EGFR and HER2 signaling pathways. Although clinical studies have shown mixed results, the behavior of HER2+ tumor cells including HER2 levels can be altered by several factors such as obesity, leptin and fatty acids. A precise knowledge is useful in new therapeutic approaches against HER+ tumors.
Collapse
Affiliation(s)
- Amitabha Ray
- Lake Erie College of Osteopathic Medicine, Seton Hill University, 20 Seton Hill Drive, Greensburg, PA 15601, USA, Phone: +(724) 552-2882, Fax: +(724) 552-2865
| |
Collapse
|
9
|
Gomart S, Gaudreau-Ménard C, Jespers P, Dilek OG, Hupkens E, Hanthazi A, Naeije R, Melot C, Labranche N, Dewachter L, Mc Entee K. Leptin-Induced Endothelium-Independent Vasoconstriction in Thoracic Aorta and Pulmonary Artery of Spontaneously Hypertensive Rats: Role of Calcium Channels and Stores. PLoS One 2017; 12:e0169205. [PMID: 28085954 PMCID: PMC5234800 DOI: 10.1371/journal.pone.0169205] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Accepted: 12/13/2016] [Indexed: 01/28/2023] Open
Abstract
Decreased leptin-induced endothelium-dependent vasodilation has been reported in spontaneously hypertensive rats (SHR). Here, we report leptin-induced vasoconstriction in endothelium-denuded pulmonary artery and thoracic aorta from SHR and sought to characterize calcium handling underlying these mechanisms. Vasoreactivity to leptin was evaluated on pulmonary artery and thoracic aorta rings from 18 weeks old male SHR with or without calcium free medium, caffeine + thapsigargin + carbonyl cyanide-4-trifluoromethoxyphenylhydrazone emptying intracellular calcium stores, nifedipine a voltage-gated calcium channel inhibitor, SKF-96365 a transient receptor potential cation channels (TRPC) inhibitor, wortmaninn, a phosphatidylinositide 3-kinases (PI3K) inhibitor, or PD98059 a mitogen-activated protein kinase kinase (MAPKK) inhibitor. Calcium imaging was performed on cultured vascular smooth muscle cells incubated with leptin in presence or not of wortmaninn or PD98059. Leptin induced vasoconstriction in denuded pulmonary artery and thoracic aorta from SHR. Response was abolished when intra- or extracellular calcium stores were emptied, after blocking TRPC or voltage-dependent calcium channels or when using MAPKK or PI3K inhibitors. In vascular smooth muscle cells, leptin increased intracellular calcium. This rise was higher in SHR and abolished by MAPKK or PI3K inhibitors. TRPC6 gene expression was upregulated in arteries from SHR. Leptin-induced vasoconstriction in denuded arteries of SHR requires intracellular stores and is TRPC- and voltage-gated calcium channels dependent. Intracellular calcium increase is more pronounced in spontaneously hypertensive rats.
Collapse
MESH Headings
- Animals
- Aorta, Thoracic/drug effects
- Aorta, Thoracic/metabolism
- Calcium/metabolism
- Cells, Cultured
- Endothelium, Vascular/drug effects
- Endothelium, Vascular/metabolism
- Hypertension/physiopathology
- Leptin/administration & dosage
- Leptin/metabolism
- Male
- Mitogen-Activated Protein Kinase Kinases/metabolism
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- Phosphatidylinositol 3-Kinases/metabolism
- Pulmonary Artery/drug effects
- Pulmonary Artery/metabolism
- Rats
- Rats, Inbred SHR
- Rats, Wistar
- Vasoconstriction/drug effects
Collapse
Affiliation(s)
- Samantha Gomart
- Laboratory of Physiology and Pharmacology, Université Libre de Bruxelles, Campus Erasme, Brussels, Belgium
| | - Caroline Gaudreau-Ménard
- Laboratory of Physiology and Pharmacology, Université Libre de Bruxelles, Campus Erasme, Brussels, Belgium
- Faculty of Medicine, University of Montréal, Montréal, Canada
| | - Pascale Jespers
- Laboratory of Physiology and Pharmacology, Université Libre de Bruxelles, Campus Erasme, Brussels, Belgium
| | - Omer Gurkan Dilek
- Faculty of Veterinary Medicine, Department of Anatomy, University of Mehmet Akif Ersoy, Burdur, Turkey
| | - Emeline Hupkens
- Laboratory of Physiology and Pharmacology, Université Libre de Bruxelles, Campus Erasme, Brussels, Belgium
| | - Aliénor Hanthazi
- Laboratory of Physiology and Pharmacology, Université Libre de Bruxelles, Campus Erasme, Brussels, Belgium
| | - Robert Naeije
- Laboratory of Physiology and Pharmacology, Université Libre de Bruxelles, Campus Erasme, Brussels, Belgium
| | - Christian Melot
- Emergency Department, Erasme University Hospital, and Biostatistics Université Libre de Bruxelles, Campus Erasme, Brussels, Belgium
| | - Nathalie Labranche
- Laboratory of Physiology and Pharmacology, Université Libre de Bruxelles, Campus La Plaine, Brussels, Belgium
| | - Laurence Dewachter
- Laboratory of Physiology and Pharmacology, Université Libre de Bruxelles, Campus Erasme, Brussels, Belgium
| | - Kathleen Mc Entee
- Laboratory of Physiology and Pharmacology, Université Libre de Bruxelles, Campus Erasme, Brussels, Belgium
- * E-mail:
| |
Collapse
|
10
|
Loria AS. Can we fight chronic kidney disease by targeting endothelial HB-EGF? Am J Physiol Renal Physiol 2016; 311:F406-8. [PMID: 27335378 DOI: 10.1152/ajprenal.00345.2016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 06/14/2016] [Indexed: 11/22/2022] Open
Affiliation(s)
- Analia S Loria
- Department of Pharmacology and Nutritional Sciences, University of Kentucky, Lexington, Kentucky
| |
Collapse
|
11
|
Chen J, Zeng F, Forrester SJ, Eguchi S, Zhang MZ, Harris RC. Expression and Function of the Epidermal Growth Factor Receptor in Physiology and Disease. Physiol Rev 2016; 96:1025-1069. [DOI: 10.1152/physrev.00030.2015] [Citation(s) in RCA: 103] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The epidermal growth factor receptor (EGFR) is the prototypical member of a family of membrane-associated intrinsic tyrosine kinase receptors, the ErbB family. EGFR is activated by multiple ligands, including EGF, transforming growth factor (TGF)-α, HB-EGF, betacellulin, amphiregulin, epiregulin, and epigen. EGFR is expressed in multiple organs and plays important roles in proliferation, survival, and differentiation in both development and normal physiology, as well as in pathophysiological conditions. In addition, EGFR transactivation underlies some important biologic consequences in response to many G protein-coupled receptor (GPCR) agonists. Aberrant EGFR activation is a significant factor in development and progression of multiple cancers, which has led to development of mechanism-based therapies with specific receptor antibodies and tyrosine kinase inhibitors. This review highlights the current knowledge about mechanisms and roles of EGFR in physiology and disease.
Collapse
Affiliation(s)
- Jianchun Chen
- Departments of Medicine, Cancer Biology, and Molecular Physiology and Biophysics, Vanderbilt University School of Medicine and Nashville Veterans Affairs Hospital, Nashville, Tennessee; and Cardiovascular Research Center, Lewis Katz School of Medicine at Temple University, Philadelphia, Pennsylvania
| | - Fenghua Zeng
- Departments of Medicine, Cancer Biology, and Molecular Physiology and Biophysics, Vanderbilt University School of Medicine and Nashville Veterans Affairs Hospital, Nashville, Tennessee; and Cardiovascular Research Center, Lewis Katz School of Medicine at Temple University, Philadelphia, Pennsylvania
| | - Steven J. Forrester
- Departments of Medicine, Cancer Biology, and Molecular Physiology and Biophysics, Vanderbilt University School of Medicine and Nashville Veterans Affairs Hospital, Nashville, Tennessee; and Cardiovascular Research Center, Lewis Katz School of Medicine at Temple University, Philadelphia, Pennsylvania
| | - Satoru Eguchi
- Departments of Medicine, Cancer Biology, and Molecular Physiology and Biophysics, Vanderbilt University School of Medicine and Nashville Veterans Affairs Hospital, Nashville, Tennessee; and Cardiovascular Research Center, Lewis Katz School of Medicine at Temple University, Philadelphia, Pennsylvania
| | - Ming-Zhi Zhang
- Departments of Medicine, Cancer Biology, and Molecular Physiology and Biophysics, Vanderbilt University School of Medicine and Nashville Veterans Affairs Hospital, Nashville, Tennessee; and Cardiovascular Research Center, Lewis Katz School of Medicine at Temple University, Philadelphia, Pennsylvania
| | - Raymond C. Harris
- Departments of Medicine, Cancer Biology, and Molecular Physiology and Biophysics, Vanderbilt University School of Medicine and Nashville Veterans Affairs Hospital, Nashville, Tennessee; and Cardiovascular Research Center, Lewis Katz School of Medicine at Temple University, Philadelphia, Pennsylvania
| |
Collapse
|
12
|
El-Zein O, Usta J, El Moussawi L, Kreydiyyeh SI. Leptin inhibits the Na(+)/K(+) ATPase in Caco-2 cells via PKC and p38MAPK. Cell Signal 2014; 27:416-23. [PMID: 25499980 DOI: 10.1016/j.cellsig.2014.12.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Revised: 11/22/2014] [Accepted: 12/06/2014] [Indexed: 10/24/2022]
Abstract
We demonstrated previously an inhibitory effect of luminal leptin on glucose absorption in differentiated Caco-2 cells. Since this process is dependent on the Na(+) gradient established by the Na(+)/K(+)ATPase this work was undertaken to investigate if the ATPase is one of the hormone's targets. Fully differentiated Caco-2 cells were incubated with 10nM luminal leptin and the activity of the Na(+)/K(+) ATPase was assayed by measuring the amount of inorganic phosphate liberated. To elucidate the signaling pathway involved, the suspected mediators, namely PKC, p38MAPK, ERK and PI3K, were inhibited with specific pharmacological inhibitors and their implication was confirmed by determining changes in the protein expression of their active phosphorylated forms by Western blot analysis. Leptin reduced significantly the activity of the Na(+)/K(+) ATPase, by activating p38MAPK via inhibition of PKC, an upstream inhibitor of the kinase. ERK and PI3K are modulators of the pump and are not along the pathway activated by leptin but cross talk with it at the level of p38MAPK.
Collapse
Affiliation(s)
- Ola El-Zein
- Department of Biology, Faculty of Arts & Sciences, American University of Beirut, Beirut, Lebanon
| | - Julnar Usta
- Department of Biochemistry & Molecular Genetics, Faculty of Medicine, American University of Beirut, Beirut, Lebanon
| | - Layla El Moussawi
- Department of Biology, Faculty of Arts & Sciences, American University of Beirut, Beirut, Lebanon
| | | |
Collapse
|
13
|
Abstract
PURPOSE OF THE REVIEW The epidermal growth factor receptor (EGFR) is a receptor tyrosine kinase with a wide implication in tumor biology, wound healing and development. Besides acting as a growth factor receptor activated by ligands such as EGF, the EGFR can also be transactivated and thereby mediate cross-talk with different signaling pathways. The aim of this review is to illustrate the Janus-faced function of the EGFR in the vasculature with its relevance for vascular biology and disease. RECENT FINDINGS Over recent years, the number of identified signaling partners of the EGFR has steadily increased, as have the biological processes in which the EGFR is thought to be involved. Recently, new models have allowed investigation of EGFR effects in vivo, shedding some light on the overall function of the EGFR in the vasculature. At the same time, EGFR inhibitors and antibodies have become increasingly established in cancer therapy, providing potential therapeutic tools for decreasing EGFR signaling. SUMMARY The EGFR is a versatile signaling pathway integrator associated with vascular homeostasis and disease. In addition to modulating basal vascular tone and tissue homeostasis, the EGFR also seems to be involved in proinflammatory, proliferative, migratory and remodeling processes, with enhanced deposition of extracellular matrix components, thereby promoting vascular diseases such as hypertension or atherosclerosis.
Collapse
|
14
|
Tsuda M, Okamoto K, Muguruma N, Sannomiya K, Nakagawa T, Miyamoto H, Kitamura S, Goji T, Kimura T, Okahisa T, Izumi K, Takayama T. Suppressive effect of RAS inhibitor manumycin A on aberrant crypt foci formation in the azoxymethane-induced rat colorectal carcinogenesis model. J Gastroenterol Hepatol 2013; 28:1616-23. [PMID: 23730936 DOI: 10.1111/jgh.12287] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 05/15/2013] [Indexed: 12/09/2022]
Abstract
BACKGROUND AND AIM The chemopreventive effect of RAS inhibitors on colorectal cancer is unknown. Because aberrant crypt foci (ACF), earliest preneoplastic lesions, are highly positive for K-RAS mutation, RAS inhibitors are likely to be effective for chemoprevention. Therefore, in the present study, the suppressive effect of a RAS inhibitor, manumycin A, on ACF formation in an azoxymethane (AOM)-induced rat colorectal carcinogenesis model was investigated. METHODS Rats injected with AOM were administered manumycin A (30 mg/kg) subcutaneously thrice weekly for 8 weeks or for 4 weeks (latter half), sacrificed at 8 weeks, and examined for ACF in the colorectum. Phosphorylated ERK and Ki-67 expression was evaluated by immunohistochemistry. Apoptosis was assessed by TUNEL staining. RESULTS The mean number of ACF in the 8-week manumycin A group (72.9 ± 20.1) was significantly lower than in the vehicle group (155.6 ± 56.7, P < 0.01), and it was significantly lower even in the 4-week manumycin A group than in the vehicle group (92.2 ± 13.0 vs 222.3 ± 83.3, P < 0.01). The positive rate for phosphorylated ERK in the manumycin A group (13.5 ± 19.2%) was significantly lower than in the vehicle group (50.2 ± 19.8%, P < 0.01). The positive rate for Ki-67 in the manumycin A group (2.2 ± 3.4%) was significantly lower than in the vehicle group (14.7 ± 8.2%, P < 0.01). There were significantly more terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate nick-end labeling-positive cells in tissue samples from the manumycin A group versus the vehicle group (8.6 ± 9.7% vs 2.9 ± 2.0%, P < 0.05). CONCLUSION Manumycin A suppressed ACF formation in the AOM-induced colorectal carcinogenesis model, demonstrating that RAS inhibitors may be very effective for chemoprevention of colorectal cancers.
Collapse
Affiliation(s)
- Miho Tsuda
- Department of Gastroenterology and Oncology, Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima, Japan
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Vecchio L, Seke Etet PF, Kipanyula MJ, Krampera M, Nwabo Kamdje AH. Importance of epigenetic changes in cancer etiology, pathogenesis, clinical profiling, and treatment: what can be learned from hematologic malignancies? Biochim Biophys Acta Rev Cancer 2013; 1836:90-104. [PMID: 23603458 DOI: 10.1016/j.bbcan.2013.04.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2012] [Revised: 01/25/2013] [Accepted: 04/10/2013] [Indexed: 02/06/2023]
Abstract
Epigenetic alterations represent a key cancer hallmark, even in hematologic malignancies (HMs) or blood cancers, whose clinical features display a high inter-individual variability. Evidence accumulated in recent years indicates that inactivating DNA hypermethylation preferentially targets the subset of polycomb group (PcG) genes that are regulators of developmental processes. Conversely, activating DNA hypomethylation targets oncogenic signaling pathway genes, but outcomes of both events lead in the overexpression of oncogenic signaling pathways that contribute to the stem-like state of cancer cells. On the basis of recent evidence from population-based, clinical and experimental studies, we hypothesize that factors associated with risk for developing a HM, such as metabolic syndrome and chronic inflammation, trigger epigenetic mechanisms to increase the transcriptional expression of oncogenes and activate oncogenic signaling pathways. Among others, signaling pathways associated with such risk factors include pro-inflammatory nuclear factor κB (NF-κB), and mitogenic, growth, and survival Janus kinase (JAK) intracellular non-receptor tyrosine kinase-triggered pathways, which include signaling pathways such as transducer and activator of transcription (STAT), Ras GTPases/mitogen-activated protein kinases (MAPKs)/extracellular signal-related kinases (ERKs), phosphatidylinositol 3-kinase (PI3K)/Akt/mammalian target of rapamycin (mTOR), and β-catenin pathways. Recent findings on epigenetic mechanisms at work in HMs and their importance in the etiology and pathogenesis of these diseases are herein summarized and discussed. Furthermore, the role of epigenetic processes in the determination of biological identity, the consequences for interindividual variability in disease clinical profile, and the potential of epigenetic drugs in HMs are also considered.
Collapse
Affiliation(s)
- Lorella Vecchio
- Laboratory of Cytometry, Institute of Molecular Genetics, CNR, University of Pavia, 27100 Pavia, Italy
| | | | | | | | | |
Collapse
|
16
|
Bełtowski J, Rachańczyk J, Włodarczyk M. Thiazolidinedione-induced fluid retention: recent insights into the molecular mechanisms. PPAR Res 2013; 2013:628628. [PMID: 23577024 PMCID: PMC3614122 DOI: 10.1155/2013/628628] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Accepted: 02/19/2013] [Indexed: 01/11/2023] Open
Abstract
Peroxisome proliferator-activated receptor- γ (PPAR γ ) agonists such as rosiglitazone and pioglitazone are used to improve insulin sensitivity in patients with diabetes mellitus. However, thiazolidinediones induce fluid retention, edema, and sometimes precipitate or exacerbate heart failure in a subset of patients. The mechanism through which thiazolidinediones induce fluid retention is controversial. Most studies suggest that this effect results from the increase in tubular sodium and water reabsorption in the kidney, but the role of specific nephron segments and sodium carriers involved is less clear. Some studies suggested that PPAR γ agonist stimulates Na(+) reabsorption in the collecting duct by activating epithelial Na(+) channel (ENaC), either directly or through serum and glucocorticoid-regulated kinase-1 (SGK-1). However, other studies did not confirm this mechanism and even report the suppression of ENaC. Alternative mechanisms in the collecting duct include stimulation of non-ENaC sodium channel or inhibition of chloride secretion to the tubular lumen. In addition, thiazolidinediones may augment sodium reabsorption in the proximal tubule by stimulating the expression and activity of apical Na(+)/H(+) exchanger-3 and basolateral Na(+)-HCO3 (-) cotransporter as well as of Na(+),K(+)-ATPase. These effects are mediated by PPAR γ -induced nongenomic transactivation of the epidermal growth factor receptor and downstream extracellular signal-regulated kinases (ERK).
Collapse
Affiliation(s)
- Jerzy Bełtowski
- Department of Pathophysiology, Medical University of Lublin, 8 Jaczewskiego, 20090 Lublin, Poland
| | - Jolanta Rachańczyk
- Department of Pathophysiology, Medical University of Lublin, 8 Jaczewskiego, 20090 Lublin, Poland
| | - Mirosław Włodarczyk
- Department of Pathophysiology, Medical University of Lublin, 8 Jaczewskiego, 20090 Lublin, Poland
| |
Collapse
|
17
|
Zhuang S, Duan M, Yan Y. Src family kinases regulate renal epithelial dedifferentiation through activation of EGFR/PI3K signaling. J Cell Physiol 2012; 227:2138-44. [PMID: 21780115 DOI: 10.1002/jcp.22946] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Dedifferentiation, a process by which differentiated cells become mesenchymal-like proliferating cells, is the first step in renal epithelium repair and occurs in vivo after acute kidney injury and in vitro in primary culture. However, the underlying mechanism remains poorly understood. In this report, we studied the signaling events that mediate dedifferentiation of proximal renal tubular cells (RPTC) in primary culture. RPTC dedifferentiation characterized by increased expression of vimentin concurrent with decreased expression of cytokeratin-18 was observed at 24 h after the initial plating of freshly isolated proximal tubules and persisted for 72 h. At 96 h, RPTC started to redifferentiate as revealed by reciprocal expression of cytokeratin-18 and vimentin and completed at 120 h. Phosphorylation levels of Src, epidermal growth factor receptor (EGFR), AKT (a target of phosphoinositide-3-kinase (PI3K)), and ERK1/2 were increased in the early time course of culture (<72 h). Inhibition of Src family kinases (SFKs) with PP1 blocked EGFR, AKT, and ERK1/2 phosphorylation, as well as RPTC dedifferentiation. Inhibition of EGFR with AG1478 also blocked AKT and ERK1/2 phosphorylation and RPTC dedifferentiation. Although inactivation of the PI3K/AKT pathway with LY294002 inhibited RPTC dedifferentiation, blocking the ERK1/2 pathway with U0126 did not show such an effect. Moreover, inhibition of SFKs, EGFR, PI3K/AKT, but not ERK1/2 pathways abrogated RPTC outgrowth and SFK inhibition decreased RPTC proliferation and migration. These findings demonstrate a critical role of SFKs in mediating RPTC dedifferentiation through activation of the EGFR/PI3K signaling pathway.
Collapse
Affiliation(s)
- Shougang Zhuang
- Department of Nephrology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China.
| | | | | |
Collapse
|
18
|
Ray A, Cleary MP. Obesity and breast cancer: a clinical biochemistry perspective. Clin Biochem 2011; 45:189-97. [PMID: 22178111 DOI: 10.1016/j.clinbiochem.2011.11.016] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2011] [Revised: 10/28/2011] [Accepted: 11/27/2011] [Indexed: 02/06/2023]
Abstract
OBJECTIVES To evaluate the laboratory diagnosis aspects of obesity-related health problems with special reference to postmenopausal breast cancer. DESIGN AND METHODS We conducted a systemic search of the literature primarily from the PubMed to obtain the relevant data. RESULTS Obesity is associated with the dysregulations of a number of body components such as blood constituents, extracellular matrix, and hormones/growth factors axes, which could be utilized for early diagnosis. CONCLUSIONS Obesity-related disorders including breast cancer have emerged as major health problems in almost all the nations. There is a need to elucidate different biochemical markers that are being used in the clinics or have the potential for such use. A precise understanding of the complex pathologies related with obesity is useful in prevention, early diagnosis and overall clinical management.
Collapse
Affiliation(s)
- Amitabha Ray
- The Hormel Institute, University of Minnesota, 801-16th Avenue NE, Austin, MN 55912, USA
| | | |
Collapse
|
19
|
Bełtowski J. Leptin and the Regulation of Renal Sodium Handling and Renal Na-Transporting ATPases: Role in the Pathogenesis of Arterial Hypertension. Curr Cardiol Rev 2011; 6:31-40. [PMID: 21286276 PMCID: PMC2845792 DOI: 10.2174/157340310790231644] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/07/2009] [Revised: 08/03/2009] [Accepted: 08/03/2009] [Indexed: 12/13/2022] Open
Abstract
Leptin, an adipose tissue hormone which regulates food intake, is also involved in the pathogenesis of arterial hypertension. Plasma leptin concentration is increased in obese individuals. Chronic leptin administration or transgenic overexpression increases blood pressure in experimental animals, and some studies indicate that plasma leptin is elevated in hypertensive subjects independently of body weight. Leptin has a dose- and time-dependent effect on urinary sodium excretion. High doses of leptin increase Na(+) excretion in the short run; partially by decreasing renal Na(+),K(+)-ATPase (sodium pump) activity. This effect is mediated by phosphatidylinositol 3-kinase (PI3K) and is impaired in animals with dietary-induced obesity. In contrast to acute, chronic elevation of plasma leptin to the level observed in patients with the metabolic syndrome impairs renal Na(+) excretion, which is associated with the increase in renal Na(+),K(+)-ATPase activity. This effect results from oxidative stress-induced deficiency of nitric oxide and/or transactivation of epidermal growth factor receptor and subsequent stimulation of extracellular signal-regulated kinases. Ameliorating "renal leptin resistance" or reducing leptin level and/or leptin signaling in states of chronic hyperleptinemia may be a novel strategy for the treatment of arterial hypertension associated with the metabolic syndrome.
Collapse
Affiliation(s)
- Jerzy Bełtowski
- Dept. of Pathophysiology, Medical University, Lublin, Poland
| |
Collapse
|
20
|
Halliwell B, Lee CYJ. Using isoprostanes as biomarkers of oxidative stress: some rarely considered issues. Antioxid Redox Signal 2010; 13:145-56. [PMID: 20001743 DOI: 10.1089/ars.2009.2934] [Citation(s) in RCA: 151] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The measurement of F2-isoprostanes by methods utilizing mass spectrometry is widely regarded as the best currently available biomarker of lipid peroxidation. F2-isoprostanes and their metabolites can be measured accurately in plasma, urine, and other body fluids using mass spectrometric techniques, and detailed protocols have been published in several papers. However, many clinical studies and intervention studies with diets or supplements, have employed single "spot" measurements of F2-isoprostanes on either plasma/serum or urine to estimate "oxidative stress." This review examines the validity of the common assumption that plasma and urinary F2-isoprostane measurements are equivalent. It identifies scenarios where they may not be and where "spot" measurements can be misleading, with examples from the literature. We also discuss the controversial issue of whether and how F2-isoprostane levels in plasma should be standardized against lipids, and, if so, which lipids to use.
Collapse
Affiliation(s)
- Barry Halliwell
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore , Singapore
| | | |
Collapse
|
21
|
Melenhorst WBWH, Mulder GM, Xi Q, Hoenderop JGJ, Kimura K, Eguchi S, van Goor H. Epidermal growth factor receptor signaling in the kidney: key roles in physiology and disease. Hypertension 2008; 52:987-93. [PMID: 18981331 DOI: 10.1161/hypertensionaha.108.113860] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Wynand B W H Melenhorst
- Department of Pathology and Medical Biology, University Medical Center Groningen, Groningen, The Netherlands.
| | | | | | | | | | | | | |
Collapse
|