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Objective::To investigate the protective effect of Ginseng Radix et Rhizoma, Notoginseng Radix et Rhizoma and Chuanxiong Rhizoma extracts on vascular calcification induced by high glucose in mice by observing the expression of osteopontin (OPN) and smooth muscle 22α (SM22α) as well as vascular calcium deposition in the common carotid artery and thoracic aorta of mice. Method::Totally 130 male C57BL/6 mice were randomly divided into normal control group and high glucose group. The mice in high glucose group were intraperitoneally injected with streptozotocin(STZ), and fed on a high-fat diet for 7 months. Then, the mice were randomly divided into model group, low-dose and high-dose Ginseng Radix et Rhizoma, Notoginseng Radix et Rhizoma and Chuanxiong Rhizoma extracts groups (0.819, 1.638 g·kg-1), and metformin group (150 mg·kg-1). Each group was intragastrically administered once a day for 9 weeks. The changes in blood glucose were measured. Seven days before the end of the administration, a group of 4-week old male C57BL/6 mice were purchased and fed normally for one week as a youth group. At the end of the administration, the common carotid artery and thoracic aorta tissues of the mice were collected. Von Kossa staining was used to determine the degree of calcium deposition in the common carotid artery and thoracic aorta. The expression levels of OPN and SM22α protein in the common carotid artery and thoracic aorta were detected by immunohistochemistry. The expression of OPN and SM22α protein in the common carotid artery of mice was determined by Western blot. Result::As compared with the young group, the blood glucose of the normal control group was slightly increased without statistical difference, the common carotid artery and thoracic aorta were uniformly stained, and no black granular precipitate was observed. As compared with the normal control group, the blood glucose of the model group was increased (P<0.01), with a large amount of brown-black particles deposited in the intimal elastic fibers, showing obvious calcium salt deposition. As compared with the model group, blood glucose was significantly decreased in each administration group (P<0.05, P<0.01), and the degree of vascular calcium salt deposition was significantly reduced. There were no significant changes in expression levels of OPN protein and SM22α protein in the common carotid artery and thoracic aorta between the youth group and normal control group. As compared with the normal control group, the expression of intimal OPN protein in the common carotid artery and thoracic aorta of the model group was positive, SM22α protein expression was weakly positive, and the gray value of OPN protein expression in the common carotid artery was significantly increased (P<0.01), while the gray value of SM22α protein was decreased significantly (P<0.01). As compared with the model group, the expression levels of intimal OPN protein and SM22α protein in the common carotid artery and thoracic aorta of each administration group were significantly improved, and the gray value of OPN protein expression in the common carotid artery was reduced (P<0.05, P<0.01), while SM22α protein expression was significantly increased (P<0.01). Conclusion::High glucose can induce calcification of common carotid artery and thoracic aorta in mice and accelerate vascular aging. This formation process may be related to the expression of OPN and SM22α. Ginseng Radix et Rhizoma, Notoginseng Radix et Rhizoma and Chuanxiong Rhizoma extracts can reduce vascular calcification and delay vascular aging by regulating the expression of OPN and SM22α.
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Objective To study the expression of osteopontin (OPN) in pancreatic cancer and to determine its prognostic significance.Methods Studies which evaluated the relationship between the expression of OPN and pancreatic cancer published up to May 2018 were found by searching the electronic databases which included the PubMed,Embase,Cochrane Library,CNKI,Wanfang and VIP.The RevMan 5.3 was used to analyze the data in this meta-analysis by determining the odds ratios (ORs) and their 95％ confidence intervals (CIs).Results Using our predetermined selection criteria,this meta-analysis included 13 studies,with 1073 cases of pancreatic cancer tissues in the case group and 346 cases of normal tissues in the control group.The results indicated OPN was over expressed in pancreatic cancers (OR =8.13,95％ CI:6.00 ～ 11.02;P ＜ 0.05).The differences in the expressions of OPN between the well differentiation group and the moderate-poor differentiation group (OR =0.37,95％ CI:O.25 ～ 0.57;P ＜ 0.05),between the clinical stage Ⅰ-Ⅱ group and the clinical stage Ⅲ-Ⅳ group (OR =0.23,95 ％ CI:0.14 ～ 0.38;P ＜0.05),and between the lymph node metastasis group and the no lymph node metastasis group (OR =3.77,95％ CI:1.99 ～ 7.13;P ＜ 0.05) were significant.The expressions of OPN did not correlate with gender,age and location of pancreatic cancer.Conclusions Current evidence indicated that OPN was significantly correlated with pancreatic cancer and its clinicopathological features.OPN could be used as an effective diagnostic and survival evaluation marker.
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Objective To study the effects of osteopontin (OPN) on the nuclear mechanics of bone marrow-derived mesenchymal stem cells (BMSCs) as well as its involved mechanisms. Methods The BMSC migration was evaluated using the Transwell assay. An atomic force microscope (AFM) was used to determine the elastic modulus of the BMSC nucleus and analyze the changes in the nuclear mechanics of the BMSCs after treatment with OPN. The activation of focal adhesion kinase (FAK) and extracellular signal-regulated kinase1/2 (ERK1/2) was measured by Western blot. The role of the FAK-ERK1/2 signaling pathway in mediating the OPN-affected BMSC nuclear mechanics was investigated by employing a specific inhibitor. RT-PCR and Western blot were used to detect the expression of Lamin A/C at mRNA and protein levels in the BMSCs, respectively. Results The elastic modulus of the BMSC nucleus exhibited a significant decrease after OPN treatment compared with that of the control group. OPN could upregulate the phosphorylation level of FAK and ERK1/2, but the inhibitor of FAK or ERK1/2 restored the OPN-decreased elastic modulus of the BMSC nucleus and inhibited the BMSC migration significantly. After treatment with OPN, the expression of Lamin A/C in the BMSCs reduced significantly, and such a reduced expression could be suppressed by the inhibitor of FAK or ERK1/2. Conclusions OPN could probably downregulate the expression of Lamin A/C of the BMSCs via the FAK-ERK1/2 signaling pathway, decrease the stiffness of the BMSC nucleus, and promote the migration of the BMSCs. The research outcomes provide the experimental evidence for further understanding the mechanism of the OPN-regulated BMSC migration and its potential clinical application.
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Objective:To systematic review the relationships between the expression of osteopontin (OPN) and esophageal squamous cell carcinoma and its clinicopathologic feature with meta-analyses.Methods: The published studies in the PubMed, the Cochrane Library, EMbase, CBM, CNKI, VIP and WanFang databases were searched, at the time, the documents retrospective method was adopted, and then a series researches about the relationships between the expression of OPN and esophageal squamous cell carcinoma and its clinicopathologic feature were collected. The Jan., 2017 was the deadline of search. The study arranged two researcher to screen documents as the standards of inclusion and exclusion, and extract data and evaluate the quality of methodology for these included documents. The RevMan 5.2 was applied to analyze these data in this Meta analysis.Results: A total of 12 case control studies were included, which included 782 cases of esophageal squamous cell carcinoma in case group and 700 persons in control group. The results of Meta analysis showed the OR of the expression of OPN between cases group and control group was 52.71, and its 95% confidence interval (CI) was 17.95-154.79. Besides, the OR of the expression of OPN between clinical Ⅰ-Ⅱ stage group and clinical Ⅲ-Ⅳ stage group was 0.20, and its 95% (CI) was 0.07-0.60. The OR of the expression of OPN between group with lymph node metastasis and group without lymph node metastasis was 6.37, and its CI was 3.64-11.15. The OR of the expression of OPN between T1+T2 group and T3+T4 group was 0.31, and its 95% (CI) was 0.15-0.64. The differences of the expression of OPN among various group had statistically significant.Conclusion:Current evidence indicates that the expression level of OPN is significantly correlated with esophageal squamous cell carcinoma and its clinicopathologic features. Due to the limited quantity of documents and quality of included studies, above conclusions need to be verified by conducting more high quality studies.
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The concentration of osteopontin (OPN)in serum of patients with oral squamous cell carcinoma(n=58),benign maxillofacial tumor(n=45)and healthy controls(n=60)was examined using ELISA kit.The OPN level(ng/ml)in the 3 groups was 1 61 .8 ±1 2.6, 52.3 ±8.6 and 48.6 ±1 2.8(P<0.05)respectively,the cases with nodal metastasis and late clinical stage have relatively higher expression levels of OPN(P<0.05).Serum OPN may be related to OSCC progression.
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Osteopontin (OPN) is phosphorylated sialic acid –rich non-collagenous bone matrix protein. OPN is found in several biological fluids including human plasma, serum, breast milk and urine.OPN was named for its function as a bridge between cells and minerals. OPN has been implicated as an important factor in bone remodeling. Osteopontin is expressed in immune cells, including macrophages, neutrophils, dendritic cells with varying kinetics. OPN influences cell mediated immunity and has Th 1 cytokine functions .OPN is overexpressed in cancers of lung, breast, colorectal, stomach and ovary.OPN is found in atheromatous plaques within arteries. OPN plays an important role during both acute and chronic inflammation. OPN is upregulated in tissues during several pathological process including atherosclerosis, valve stenosis, myocardial infarction and rheumatic arthritis. OPN is a key cytokine regulating tissue repair. OPN’s plasma levels are elevated in overweight and obesity.
Subject(s)
Atherosclerosis , Humans , Inflammation , Obesity , Osteopontin/blood , Osteopontin/chemistry , Osteopontin/immunology , Osteopontin/metabolism , Osteopontin/physiology , Osteopontin/urine , Vascular CalcificationABSTRACT
Objective To investigate the effect of different doses of Vitamin K3 on the expression of osteopontin in rats kidney. Methods After different dose of Vitamin K3 were injected to different groups of rats feeded with same stone-inducing agent, the level of expression of OPN in renal tissues was observed with immunohistological staining. Results OPN expression located at distal convoluted tubule when the rats feeded without stone-inducing agent, and the OPN expression stain was extended to proximal convoluted tubule when the stone-inducing agent was feeded. Vitamin K3 can decrease the extension of OPN expression induced by the agent and more doses of Vitamin K3, more effects. Conclusions Vitamin K3 can decrease the expression of OPN in the kidney tubule of rats feeded with stone-induced agent.