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Lian HM, Guo JY, Sun Y, Zhang MH, Piao LH, Jin Z, Cai YL. Mechanism of CNP-mediated DG-PKC and IP4 signaling pathway in diabetic rats with gastric motility disorder. Mol Biol Rep 2019; 47:141-149. [PMID: 31583569 DOI: 10.1007/s11033-019-05115-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Accepted: 09/26/2019] [Indexed: 11/26/2022]
Abstract
In the precedent research conducted by the same team, it concluded that the activities in C-type natriuretic peptide (CNP)/cyclic guanosine monophosphate (cGMP)/cyclic adenosine monophosphate (cAMP)/β-type phospholipase C (PLCβ) pathways of rat antral smooth muscle were changed due to diabetes, which was the key pathogenetic mechanism for diabetic gastric dysmotility. As the follow-on step, this study was designed to probe into the downstream signaling pathway of CNP/PLCβ. The results showed that level of α-type protein kinase C (PKCα),cell membrane to cytoplasm ratio of PKCα, cell membrane to cytoplasmic ratio of βI-type protein kinase C (PKCβI) and level of Phosphor-PKCα (P-PKCα) were significantly reduced in diabetes rat antral smooth muscle samples. The content of tetraphosphate inositol (IP4) in gastric antral smooth muscle of diabetic rats reduced, and the content of diacyl-glycerol (DG) was unchanged. CNP significantly decreased the content of IP4 and DG, this effect was more obvious in diabetic rats. Subsequent to the addition of protein kinase A (PKA) blocker N-[2- (p-Bromocin-namylamino)ethyl]-5 -isoquinolinesulfonamide dihydrochloride (H-89) before CNP treatment, the inhibitory effect of CNP was reduced; subsequent to the addition of protein kinase G (PKG) blocker KT5823 before CNP treatment, the inhibitory effect of CNP was also reduced. With the addition of the combination of H-89 and KT5823 before CNP treatment, the inhibition by CNP could be offset. These results were concluded that CNP inhibited the activity of PKC family in rat smooth muscle and reduced the levels of IP4 and DG through the PKG/PKA-PLCβ pathways, causing inhibited muscular contractions, which may be a key pathogenetic factor for diabetic gastroparesis.
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Affiliation(s)
- Hui-Ming Lian
- Department of Histology and Embryology, Yanbian University School of Medicine, 977 Gongyuan, Road, Jilin, Yanji, 133002, China
| | - Jun-Yu Guo
- Department of Histology and Embryology, Yanbian University School of Medicine, 977 Gongyuan, Road, Jilin, Yanji, 133002, China
| | - Yan Sun
- Department of Histology and Embryology, Yanbian University School of Medicine, 977 Gongyuan, Road, Jilin, Yanji, 133002, China
| | - Mo-Han Zhang
- Department of Histology and Embryology, Yanbian University School of Medicine, 977 Gongyuan, Road, Jilin, Yanji, 133002, China
| | - Li-Hua Piao
- Department of Histology and Embryology, Yanbian University School of Medicine, 977 Gongyuan, Road, Jilin, Yanji, 133002, China
| | - Zheng Jin
- Department of Histology and Embryology, Yanbian University School of Medicine, 977 Gongyuan, Road, Jilin, Yanji, 133002, China
| | - Ying-Lan Cai
- Department of Histology and Embryology, Yanbian University School of Medicine, 977 Gongyuan, Road, Jilin, Yanji, 133002, China.
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An J, Li Y, Song S, Liu S. Electroacupuncture promotes the gastrointestinal motility of diabetic mice by CNP/NPR-B-cGMP and PDE3A-cGMP signaling. Neurogastroenterol Motil 2019; 31:e13539. [PMID: 30672071 DOI: 10.1111/nmo.13539] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Revised: 12/03/2018] [Accepted: 12/11/2018] [Indexed: 12/12/2022]
Abstract
BACKGROUND Electroacupuncture (EA) can promote gastrointestinal (GI) motility of diabetic mice, but the mechanism is not clearly elucidated. Natriuretic peptides (NPs) were related to the diabetes-induced gut dysfunction of mice, which may be associated with ICC (interstitial cells of cajal). Besides, EA could increase the ICC of diabetic mice. Our aim was to explore whether EA can promote the gut motility by CNP/NPR-B-cGMP and PDE3A-cGMP signaling in diabetic mice, and the relationship between NPs and ICC. METHODS Wild C57BL/6 male mice were divided into five groups: control group, diabetic mellitus (DM group), diabetic mellitus plus sham EA group (SEA), diabetic mellitus plus low-frequency EA group (LEA), and diabetic mellitus plus high-frequency group (HEA). Gastrointestinal motility was assessed by gastric emptying and GI transit test. Immunofluorescence staining was applied to assess the expression level of CNP, NPR-B, and c-Kit. Western blot, PCR, and ELISA were used to detect the level of CNP, NPR-B, PDE2A, PDE3A, c-Kit, mSCF, and cGMP content. The correlativity between NPR-B and mSCF was evaluated by Pearson's correlation and linear regression analyses. KEY RESULTS (a) EA could improve the GI dysfunction of diabetic mice. (b) CNP, NPR-B, and cGMP contents were decreased, but the level of PDE3A, c-Kit, and mSCF was increased in the EA groups. (c) There was a negative correlation between NPR-B and mSCF among the groups. CONCLUSIONS AND INFERENCES Electroacupuncture promotes the GI function by CNP/NPR-B-cGMP and PDE3A-cGMP signaling in diabetic mice; up-regulated mSCF/c-Kit signaling by EA may be mediated partially via down-regulation of CNP/NPR-B signaling.
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Affiliation(s)
- Jing An
- Division of Gastroenterology, Union Hospital, Tongji medical college, Huazhong University of Science and Technology, Wuhan, China
| | - YingLi Li
- Division of Gastroenterology, Union Hospital, Tongji medical college, Huazhong University of Science and Technology, Wuhan, China
| | - ShuangNing Song
- Division of Gastroenterology, Union Hospital, Tongji medical college, Huazhong University of Science and Technology, Wuhan, China
| | - Shi Liu
- Division of Gastroenterology, Union Hospital, Tongji medical college, Huazhong University of Science and Technology, Wuhan, China
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Fu-Jiao N, Zhi-Min L, Shu-Ming S, Yi-Jing Y, Xiang-Dong C, Qing-Hua P. Dan Huang Ming Mu Recipe Suppresses the Progression of Streptozotocin-induced Diabetic Retinopathy After Retinal Laser Photocoagulation in Brown Norway Rats via Down-regulating Vascular Endothelial Growth Factor and Up-regulating Pigment Epithelium-derived Factor. DIGITAL CHINESE MEDICINE 2019. [DOI: 10.1016/j.dcmed.2019.05.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
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Guo JY, Zhang MH, Jiang JZ, Piao LH, Fang XS, Jin Z, Cai YL. The role of CNP-mediated PKG/PKA-PLCβ pathway in diabetes-induced gastric motility disorder. Peptides 2018; 110:47-55. [PMID: 30391424 DOI: 10.1016/j.peptides.2018.10.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Revised: 10/30/2018] [Accepted: 10/30/2018] [Indexed: 12/18/2022]
Abstract
Our previous work demonstrated that the C-type natriuretic peptide (CNP)/cyclic guanosine monophosphate (cGMP)/cyclic adenosine monophosphate (cAMP) pathway in gastric antrum smooth muscle of rats with diabetes was upregulated and played an important role in the development of diabetic gastric dysmotility. Our goal for this study was to explore the downstream signaling pathways of CNP. We found that the expressions of protein kinase G (PKG) and protein kinase A (PKA) in gastric smooth muscle tissue of rats with diabetes were significantly upregulated. The expressions of β-type phospholipase C 3(PLCβ3) and β-type phospholipase C 1(PLCβ1) protein were reduced, whereas Phosphor-PLCβ3Ser1105 (P-PLCβ3Ser1105) was increased. The inhibitory effect of CNP on gastric antral smooth muscle in diabetic rats was significantly greater than in the normal group. The content of trisphosphate inositol (IP3) in the gastric antral smooth muscle of rats with diabetes was significantly lower than that of the normal group. After blocking PKA with N-[2-(p-Bromocinnamylamino)ethyl]-5-isoquinolinesulfonamide dihydrochloride (H-89, a blockage PKA), the effect of CNP on the production of IP3 was decreased, while blocking PKG with KT5823 (a blockage PKG) simultaneously, and CNP can no longer reduce the IP3 production. CNP promoted the phosphorylation of PLCβ3Ser1105, thereby inhibiting the activity of PLCβ3 in gastric smooth muscle tissue of rats with diabetes; this effect can be abolished by blocking PKA and PKG. These results suggested that CNP can decrease IP3 level in gastric smooth muscle cells and thus inhibit gastric smooth muscle contraction through PKG/PKA-PLCβ pathway, which may play an important role in the development of diabetic gastroparesis.
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Affiliation(s)
- Jun-Yu Guo
- Department of Physiology, Yanbian University School of Medicine, 977 Gongyuan, Road, Jilin, Yanji 133002, China
| | - Mo-Han Zhang
- Department of Physiology, Yanbian University School of Medicine, 977 Gongyuan, Road, Jilin, Yanji 133002, China
| | - Jing-Zhi Jiang
- Department of Physiology, Yanbian University School of Medicine, 977 Gongyuan, Road, Jilin, Yanji 133002, China
| | - Li-Hua Piao
- Department of Physiology, Yanbian University School of Medicine, 977 Gongyuan, Road, Jilin, Yanji 133002, China
| | - Xue-Sen Fang
- Department of Physiology, Yanbian University School of Medicine, 977 Gongyuan, Road, Jilin, Yanji 133002, China
| | - Zheng Jin
- Department of Physiology, Yanbian University School of Medicine, 977 Gongyuan, Road, Jilin, Yanji 133002, China
| | - Ying-Lan Cai
- Department of Physiology, Yanbian University School of Medicine, 977 Gongyuan, Road, Jilin, Yanji 133002, China.
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Wu LH, Zhang Q, Zhang S, Meng LY, Wang YC, Sheng CJ. Effects of gene knockdown of CNP on ventricular remodeling after myocardial ischemia-reperfusion injury through NPRB/Cgmp signaling pathway in rats. J Cell Biochem 2017; 119:1804-1818. [PMID: 28796407 DOI: 10.1002/jcb.26341] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Accepted: 08/08/2017] [Indexed: 01/27/2023]
Abstract
This study aimed to explore effects of CNP on ventricular remodeling following myocardial ischemia-reperfusion (I/R) injury through the NPRB/cGMP signaling pathway. Rat cardiomyocytes were assigned into: control, I/R, I/R + CNP, and I/R + 8-Br-cGMP groups. ELISA, qRT-PCR, and Western blotting were used to detect cGMP content and expression, respectively. After model establishment of I/R rats, normal control, CNP-/- control, I/R, and CNP-/- groups were set. Indexes of heart were detected using echocardiography and hemodynamics. ELISA was used to measure serum CNP, cGMP, LDH, cTn I, CK-MB, TNF-α, and IL-6 levels. Myocardial infarct was identified by TTC staining, and apoptosis conditions by TUNEL staining. QRT-PCR and Western blotting were adopted to detect expressions of CNP, NPRB, cGMP, and apoptosis-related genes. Compared with control group, cGMP contents and expression in the I/R, I/R + CNP and I/R + 8-Br-cGMP groups were decreased. Levels of LVEDV, LVESV, LVDS, LVDD, IVSD, LVM, LVEDP, and LVSP were higher in the I/R, CNP-/- control, and CNP-/- groups than normal control group while LVEF, SV, CO, and ±dp/dtmax were lower. Compared with the normal control group, LDH, cTn I, CK-MB, TNF-α, and IL-6 were higher in the I/R, CNP-/- control and CNP-/- groups; pathological changes and myocardial infarction were observed in the I/R, CNP-/- control, and CNP-/- groups; expressions of apoptosis-related genes in those groups were higher; while CNP, NPRB, cGMP, and Bcl-2 expressions were decreased. We came to the conclusion that gene knockdown of CNP blocks the NPRB/cGMP signaling pathway, thereby aggravating myocardial I/R injury and causing ventricular remodeling in rats.
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Affiliation(s)
- Lian-He Wu
- Department of Cardiac Surgery, Jining No.1 People's Hospital, Jining, China
| | - Qi Zhang
- Department of Cardiology, Dongying City People's Hospital, Dongying, China
| | - Shen Zhang
- Department of Cardiac Surgery, Jining No.1 People's Hospital, Jining, China
| | - Lu-Yu Meng
- Department of Cardiac Surgery, Jining No.1 People's Hospital, Jining, China
| | - Yan-Chi Wang
- Department of Cardiac Surgery, Jining No.1 People's Hospital, Jining, China
| | - Cun-Jian Sheng
- Department of Cardiac Surgery, Jining No.1 People's Hospital, Jining, China
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