CN111175522B - Application of oxidized high-density lipoprotein - Google Patents

Application of oxidized high-density lipoprotein Download PDF

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CN111175522B
CN111175522B CN201811331617.6A CN201811331617A CN111175522B CN 111175522 B CN111175522 B CN 111175522B CN 201811331617 A CN201811331617 A CN 201811331617A CN 111175522 B CN111175522 B CN 111175522B
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density lipoprotein
oxidized high
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孙嘉腾
杨克
刘艳
陈媛媛
陈亚芬
王燕萍
毛静妍
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Ruinjin Hospital Affiliated to Shanghai Jiaotong University School of Medicine Co Ltd
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Abstract

The invention belongs to the field of medicines, and particularly relates to application of oxidized high-density lipoprotein. The oxidized high-density lipoprotein is used as a target or marker of the calcified aortic valve diseases, and the detection reagent of the oxidized high-density lipoprotein and/or the oxidized high-density lipoprotein can be used for preparing a diagnostic reagent of the calcified aortic valve diseases, monitoring the concentration of the oxidized high-density lipoprotein and predicting the occurrence and the process of the calcified aortic valve diseases; the inhibitor or blocker of oxidized high density lipoprotein can also be used for preparing medicine for treating calcific aortic valve diseases; the oxidized high-density lipoprotein and/or the detection reagent of the oxidized high-density lipoprotein can also be used for preparing a screening agent of drugs for treating calcified aortic valve diseases and screening drugs for treating calcified aortic valve diseases. The application of the oxidized high-density lipoprotein provides a new way and basis for clinical diagnosis and treatment of calcified aortic valve diseases.

Description

Application of oxidized high-density lipoprotein
Technical Field
The invention belongs to the field of medicines, and particularly relates to application of oxidized high-density lipoprotein.
Background
At present, calcific Aortic Valve Disease (CAVD) is the most common heart valvular disease worldwide and is characterized by progressive mineralization of the aortic valve. However, the specific cellular and molecular mechanisms of calcified aortic disease are not fully studied. Similar to the pathogenic mechanism of vascular atherosclerosis, increasing lipid infiltration and increasing oxidative stress levels can promote the development of CAVD.
Aortic Valve Interstitial Cells (AVICs) are the most abundant cell type in the valve leaflets and play an important role in maintaining aortic valve function. In normal aortic valves, AVICs are quiescent fibroblast-like cells (qVICs); however, under a series of changes (such as lipid infiltration, oxidative stress, inflammation and the like) induced by mechanical stress, disease states and the like, AVICs are activated and differentiated into osteoblast-like valve mesenchymal cells (oVICs), which are important for calcium deposition caused by CAVD.
High-density lipoprotein (HDL) can protect the arterial wall through multiple mechanisms to prevent atherosclerosis, for example, HDL can promote reverse cholesterol transport, inhibit low-density lipoprotein (LDL) oxidation and inflammatory reaction, and directly exert endothelial protection effect. In vitro studies have found that native human high density lipoprotein (native human HDL, N-HDL) can reduce the degree of calcification of Vascular Smooth Muscle (VSMCs) and valvular myofibroblasts by down-regulating inflammatory factor expression. However, the protective effects of HDL are quite unstable, e.g. in oxidative stress, HDL has an atherogenic effect after oxidative modification, ox-HDL can induce VSMC proliferation, cause Endothelial Cell (EC) and Endothelial Progenitor Cell (EPC) dysfunction, and promote the occurrence of oxidative stress and apoptosis in monocytes/macrophages. Recent studies have found that apolipoprotein A1 (a major protein component of apoproteina A1, apoA1, HDL) accumulates in valve tissue of CAVD patients, and apoA 1-derived amyloid extracts promote apoptosis of AVICs. However, it is not currently clear whether oxidative modification of HDL occurs in CAVD patients, and what role ox-HDL plays in the mineralization of AVICs.
The research discovers that HDL oxidation modification in CAVD patients generates oxidized high density lipoprotein (ox-HDL), the ox-HDL participates in the pathological process of aortic valve calcification by promoting osteoblast differentiation of AVICs, and discovers that the concentration of the ox-HDL is positively correlated with the risk of CAVD, thereby providing a new way for monitoring, diagnosing and treating CAVD diseases.
Disclosure of Invention
The invention aims to provide application of oxidized high-density lipoprotein.
Clinical researches of the application find that the content of oxidized high-density lipoprotein (ox-HDL) in the serum of a patient with Calcific Aortic Valve Diseases (CAVD) is obviously increased, and the concentration of the ox-HDL is positively correlated with the incidence rate of the calcific aortic valve diseases. In vitro researches show that the ox-HDL can increase ALP activity of alkaline phosphatase in a concentration-dependent manner, and/or increase the gene expression level of osteogenic factors such as BMP2, runx2, msx2 and the like, promote differentiation and/or calcification of Aortic Valve Interstitial Cells (AVICs) in an osteogenic direction, and increase the risk of onset of Calcific Aortic Valve Diseases (CAVD).
By monitoring the concentration of oxidized high-density lipoprotein in serum and the change thereof, the occurrence and the progress of calcified aortic valve diseases can be predicted, and effective diagnosis, monitoring and evaluation can be carried out. Therefore, oxidized high-density lipoprotein can be used as a target or marker for diagnosis and/or treatment of calcified aortic valve diseases.
The oxidized high-density lipoprotein or the detection reagent of the oxidized high-density lipoprotein can be used for preparing a calcified aortic valve disease diagnostic agent, and the concentration of the oxidized high-density lipoprotein in serum is detected by taking the oxidized high-density lipoprotein as a target or a marker.
The oxidized high-density lipoprotein is used as a target or a marker of the calcified aortic valve diseases, and a detection reagent of the oxidized high-density lipoprotein can be used for screening the medicines for treating the calcified aortic valve diseases.
The inhibitor or the blocker of the oxidized high-density lipoprotein can be used for preparing medicaments for treating calcified aortic valve diseases and inhibiting and/or reversing calcified aortic valve diseases by inhibiting and/or blocking the generation of the oxidized high-density lipoprotein in serum, reducing ALP activity of alkaline phosphatase, and/or inhibiting BMP2, runx2 and Msx2 osteogenic factor gene expression, and inhibiting and/or reversing differentiation and/or calcification of interstitial cells of the aortic valve in the osteogenesis direction.
A diagnostic agent for calcified aortic valve diseases contains oxidized high density lipoprotein and/or detection reagent. The detection reagent for the oxidized high-density lipoprotein can detect the concentration of the oxidized high-density lipoprotein in serum, predict the progress of calcified aortic valve diseases, and carry out effective diagnosis, monitoring and evaluation.
The diagnostic agent can be prepared into any pharmaceutically acceptable form with the functions of diagnosis and/or monitoring according to needs. The diagnostic agent also comprises any one or more pharmaceutically acceptable auxiliary diagnostic components and/or carriers.
The inhibitor or blocker of oxidized high-density lipoprotein can also be used for preparing medicine for treating calcific aortic valve diseases.
The inhibitor or blocker of oxidized high-density lipoprotein can inhibit and/or reverse differentiation and/or calcification of interstitial cells of aortic valve towards osteogenesis direction by inhibiting and/or blocking the production of oxidized high-density lipoprotein in serum, thereby inhibiting and/or reversing calcified aortic valve diseases.
The inhibitor or the blocker of oxidized high-density lipoprotein inhibits the ALP activity of alkaline phosphatase and/or inhibits the expression of genes related to the calcification of valve interstitial cells by inhibiting and/or blocking the generation of oxidized high-density lipoprotein in serum, thereby inhibiting and/or reversing the differentiation and/or calcification of the valve interstitial cells to the osteogenic direction.
The genes related to the calcification of the valve interstitial cells are BMP2, runx2 and Msx2.
A medicine for treating calcified aortic valve diseases contains inhibitor or blocker of oxidized high density lipoprotein.
The therapeutic drug can be prepared into any pharmaceutically acceptable dosage form with the functions of prevention and/or treatment according to the needs. The therapeutic drug also comprises any one or more pharmaceutically acceptable auxiliary therapeutic ingredients and/or carriers.
The oxidized high-density lipoprotein is used as a new target or marker for diagnosing the calcified aortic valve diseases, and can also be used for screening therapeutic drugs for the calcified aortic valve diseases. The oxidized high-density lipoprotein or the detection reagent of the oxidized high-density lipoprotein can be used for preparing a screening agent of a calcified aortic valve disease treatment drug, screening substances for inhibiting and/or blocking the generation of the oxidized high-density lipoprotein in serum, inhibiting and/or reversing differentiation and/or calcification of aortic valve interstitial cells to the osteogenesis direction, and treating calcified aortic valve diseases.
The oxidized high-density lipoprotein or the detection reagent of the oxidized high-density lipoprotein can be used for screening the therapeutic drugs for calcified aortic valve diseases, and the oxidized high-density lipoprotein is used as a target or a marker to screen substances which can inhibit or block the generation of the oxidized high-density lipoprotein.
The inhibitor or the blocker of the oxidized high-density lipoprotein is used as an active molecule for inhibiting and/or reversing calcified aortic valve diseases, and inhibiting and/or blocking the generation of the oxidized high-density lipoprotein in serum, thereby inhibiting and/or reversing differentiation and/or calcification of interstitial cells of the aortic valve towards osteogenesis.
The inhibitor or blocker of oxidized high-density lipoprotein can inhibit ALP activity of alkaline phosphatase and/or inhibit gene expression related to calcification of valve interstitial cells by inhibiting and/or blocking the production of oxidized high-density lipoprotein in serum, thereby inhibiting differentiation and/or calcification of valve interstitial cells towards osteogenesis direction.
The genes related to the calcification of the valve interstitial cells are BMP2, runx2 and Msx2.
A screening agent for a therapeutic agent for calcified aortic valve diseases contains a detection reagent for oxidized high-density lipoprotein and/or oxidized high-density lipoprotein. The detection reagent for the oxidized high-density lipoprotein can monitor and/or evaluate the therapeutic activity of the therapeutic drug for the calcified aortic valve diseases by detecting the concentration of the oxidized high-density lipoprotein, and screen the therapeutic drug for the calcified aortic valve diseases.
The screening agent can be prepared into any pharmaceutically acceptable form with diagnosis and/or monitoring effects according to needs. The screening agent also comprises any one or more pharmaceutically acceptable auxiliary screening components and/or carriers.
Compared with the prior art, the invention has the following advantages:
clinical researches of the application find that the content of oxidized high-density lipoprotein (ox-HDL) in the serum of a patient with Calcified Aortic Valve Disease (CAVD) is obviously increased, the incidence of CAVD is gradually increased along with the increase of the concentration of ox-HDL, and the concentration of ox-HDL is positively correlated with the incidence of CAVD. In vitro studies show that the ox-HDL can promote differentiation and/or calcification of Aortic Valve Interstitial Cells (AVICs) to the osteogenic direction by enhancing ALP activity of alkaline phosphatase and/or increasing the expression level of BMP2, runx2 and Msx2 genes.
Therefore, the oxidized high-density lipoprotein can be used as a new target or a marker for clinical diagnosis and treatment of the calcified aortic valve diseases, and the oxidized high-density lipoprotein and a detection reagent thereof can be used for preparing a diagnostic agent for the calcified aortic valve diseases, detecting the concentration of the oxidized high-density lipoprotein in serum, predicting the occurrence and the process of the calcified aortic valve diseases, and diagnosing, monitoring and evaluating the calcified aortic valve diseases.
Meanwhile, the inhibitor or the blocker of the oxidized high-density lipoprotein can also be used for preparing a therapeutic drug for calcified aortic valve diseases, can inhibit ALP activity of alkaline phosphatase and/or inhibit expression levels of BMP2, runx2 and Msx2 genes by inhibiting and/or blocking the generation of the oxidized high-density lipoprotein, further inhibit and/or reverse differentiation and/or calcification of Aortic Valve Interstitial Cells (AVICs) to the osteogenic direction, finally inhibit and/or reverse calcified aortic valve diseases, and is used for treating calcified aortic valve diseases.
The oxidized high-density lipoprotein and the detection reagent thereof can also be used for preparing a screening agent of calcified aortic valve disease treatment drugs, detecting the concentration of the oxidized high-density lipoprotein, predicting and/or evaluating the treatment activity of the calcified aortic valve disease treatment drugs and screening the calcified aortic valve disease treatment drugs.
In conclusion, the oxidized high-density lipoprotein is used as a new target or marker for clinical diagnosis and treatment of the calcified aortic valve diseases, so that a new way and basis are provided for clinical diagnosis and treatment of the calcified aortic valve diseases, and a new way and basis are provided for research and development of drugs for treating the calcified aortic valve diseases.
Drawings
FIG. 1 is a ROC curve for the evaluation of CAVD risk using ox-HDL as described in example 1.
FIG. 2 shows the results of alizarin Red S staining and alkaline phosphatase ALP activity assay after the calcification culture of AVICs in example 2. FIG. 2A is a graph showing alizarin Red S staining and alkaline phosphatase ALP activity staining for each experimental group (Con, 50. Mu.g/mL N-HDL, 10. Mu.g/mL ox-HDL, 50. Mu.g/mL ox-HDL), FIG. 2B is a graph showing ALP activity test results for each experimental group (Con, 50. Mu.g/mL N-HDL, 10. Mu.g/mL ox-HDL, 50. Mu.g/mL ox-HDL), and FIG. 2C is a graph showing calcium deposition level for each experimental group (Con, 50. Mu.g/mL N-HDL, 10. Mu.g/mL ox-HDL, 50. Mu.g/mL ox-HDL).
FIG. 3 is a graph showing the expression levels of the calcification-associated genes (BMP 2, runx2, msx 2) in each experimental group (Con, 50. Mu.g/mL N-HDL, 10. Mu.g/mL ox-HDL, 50. Mu.g/mL ox-HDL) in example 2.
Detailed Description
The statistical analysis method comprises the following steps: statistical data analysis was performed using SPSS 22.0 (usa, illinois) and MedCalc 11.4 (kelck, belgium, mary) software. Measure data to
Figure BDA0001860154670000051
And (4) showing. The metering data conforming to normal distribution is tested by an independent sample t; the non-normal distribution is tested using the ManWhitney rank sum test. The counting data is checked by chi-square. The difference between the mean values of the multiple samples was analyzed using variance.
Multivariate linear regression and Pearson's test were used to assess the correlation between ox-HDL concentration and hypertension, diabetes, glycated hemoglobin, triglycerides, total cholesterol, high density lipoprotein, low density lipoprotein, lipoprotein (a), hypersensitive C-reactive protein, creatinine, statin intake, and body mass index.
After correcting the incidence of CAD and the related risk factors of atherosclerosis, logistic regression was used to analyze whether the increase in ox-HDL level is an independent predictor of CAVD risk. Calculating ox-HDL by an ROC curve to evaluate the diagnostic value of CAVD suffering risk. The areas under the ROC curves between groups were compared by MedCalc. Differences were statistically significant with a two-sided P < 0.05.
Example 1
1.1 test population
A total of 2674 patients with myocardial ischemia were collected continuously in the Shanghai Rekin Hospital, and an echocardiogram and a coronary angiography were performed for each patient. Of these, 168 patients were diagnosed as CAVD patients by echocardiography and Doppler flow imaging and were enrolled in the CAVD cohort. The aortic valve in CAVD patients exhibits calcific degeneration and meets the criteria of leaflet opacity with mild focal thickening and leaflet stiffness (according to AHA guidelines). Each CAVD patient was age (+ -1 year) and gender matched to one of the remaining patients, and was included in the non-CAVD group.
The study did not incorporate patients with a history of rheumatic diseases, bicuspid aortic valve malformations, moderate to severe aortic regurgitation or inflammatory diseases to avoid confounding factors. The CAD is diagnosed when the diameter stenosis degree of the main coronary artery lumen is more than or equal to 50 percent. According to the ethical guidelines of Helsinki declaration, the study was approved by the ethical Committee of the medical college of Shanghai university of transportation, and all participants signed informed consent.
1.2 general data on subjects
Subject baseline data and risk factors are shown in table 1. The blood pressure, body mass index, hypersensitivity C-reactive protein and lipoprotein (a) of CAVD group patients are all obviously higher than those of non-CAVD group. And the CAVD group patients had lower ejection fraction compared to the non-CAVD group.
Between groups, fasting plasma glucose, glycated hemoglobin, calcium, phosphorus, renal function, diabetes, CAD and hyperlipidemia were not statistically different. Except that more CAVD patients receive the treatment of hypertension, the treatment conditions of the medicines in the two groups are equivalent.
TABLE 1 Baseline data and Biochemical evaluation data
CAVD(n=168) non-CAVD (n = 168) P value
Age (year) 70.0±7.4 69.9±7.3 Matching
Male/female 101/67 101/67 Matching
Body mass index 25.6±3.4 23.7±4.0 <0.001
Blood pressure (n,%) 134(79.7) 110(65.5) 0.003
Diabetes mellitus (n,%) 56(33.3) 53(31.5) Is not significant
History of smoking (n,%) 37(22.0) 35(20.8) Is not significant
History of drinking (n,%) 56(33.3) 50(29.8) Is not significant
Coronary artery disease (n,%) 129(76.8) 123(73.2) Is not significant
Triglyceride (mmol/L) 1.67±1.14 1.60±1.82 Is not significant
Total cholesterol (mmol/L) 4.28±1.17 4.1±0.97 Is not significant
High density lipoprotein cholesterol (mmol/L) 1.10±0.22 1.10±0.26 Is not significant
Low density lipoprotein cholesterol (mmol/L) 2.42±0.93 2.30±0.94 Is not significant
Lipoprotein (a) (g/L)) 0.29±0.34 0.20±0.19 0.004
Fasting blood glucose (mmol/L) 5.62±1.52 5.60±1.62 Is not significant
Glycated hemoglobin (%) 6.33±1.11 6.16±0.99 Is not significant
Hypersensitivity C-reactive protein (mg/L) 2.20±2.14 1.74±1.95 0.038
Creatinine (mu mol/L) 82.77±18.6 81.21±19.95 Is not significant
Blood urea nitrogen (mmol/L) 6.08±1.99 5.81±1.40 Is not significant
Glomerular filtration Rate (mL/min/1.73 m) 2 ) 81.34±17.78 79.81±17.06 Is not significant
Serum cystatin C (mg/L) 1.17±0.28 1.13±0.31 Is not significant
Calcium (mmol/L) 2.21±0.10 2.20±0.11 Is not significant
Phosphate (mmol/L) 1.13±0.18 1.10±0.18 Is not significant
Ejection fraction (%) 63.19±7.38 66.07±5.16 <0.001
High density lipoprotein oxide (ng/mL) 131.52±30.96 112.58±32.20 <0.001
Medical treatment
Statins (n,%) 42(72.4) 50(84.7) Is not significant
Hypoglycemic agent (n,%) 50(29.8) 48(28.6) Is not significant
Antihypertensive drug (n,%) 130(77.4) 105(62.5) 0.003
1.3 Biochemical detection of clinical specimens
All participants collected blood samples before cardiac catheterization, and serum was stored in a-70 ℃ refrigerator after standard treatment. Peripheral blood biochemical assays were performed using a Hitachi 912Analyzer (Roche Diagnostics, germany) according to standard laboratory manual protocols. ELISA kit (Cell Biolabs, USA) is adopted to detect the concentration of ox-HDL in serum, and the specific operation is as follows: firstly, adding serum to a high-affinity ELISA plate pre-coated by an MDA antibody, then co-incubating with an anti-human apoA1 antibody, then adding horse radish peroxidase labeled streptavidin for detection, and finally reading the absorbance value of each sample with the wavelength of 450nm of a spectrophotometer.
1.4ox-HDL levels and risk of CAVD
Compared with a non-CAVD group, the serum ox-HDL concentration of the CAVD group patients is remarkably increased (131.52 +/-30.96 ng/mL vs.112.58 +/-32.20 ng/mL, P is less than 0.001); the rates of CAVD patients also increased progressively from lower quartiles (< 97.0 ng/mL) to upper quartiles (> 143.7 ng/mL) in serum ox-HDL concentrations (Table 2).
Compared with the quartile at the serum ox-HDL concentration, the CAVD risk is significantly increased by 3.06 (95%: 1.98-4.74) compared with the quartile at the ox-HDL concentration (Table 2).
The ROC analysis showed that the area under the curve for the ox-HDL predicted CAVD risk was 0.681 (95% CI 0.628-0.730, P-Ap-0.001), and the optimal screening value for the ox-HDL predicted CAVD risk was 106.8ng/mL. The ox-HDL at this concentration was 80.4% sensitive and 51.8% specific for CAVD.
TABLE 2 CAVD incidence based on ox-HDL concentration levels
CAVD,n(%) Probability (95% confidence interval)
The first quartile (n =84,<97.0ng/mL) 18(21.4) 1
second quartile (n =84,97.1-119.3 ng/mL) 43(51.2) 2.39(1.51–3.78)
Third quartile (n =84,119.4-143.6 ng/mL) 52(62.0) 2.89(1.86–4.50)
The fourth quartile (n =84,>143.7ng/mL) 55(65.4) 3.06(1.98–4.74)
quartile P value <0.001
1.5 correlation between ox-HDL and aortic valve calcification independent of CAD
After correction for CAD incidence, logistic regression showed that ox-HDL levels were independently correlated with CAVD (OR 1.019,95% CI 1.012-1.027, P-Ap 0.001) (Table 3).
Similarly, after correction for atherosclerosis-related risk factors including hypertension, diabetes, glycated hemoglobin, lipid metabolism disorders, lipoprotein (a), body mass index, hypersensitive C-reactive protein, and creatinine, logistic regression showed that ox-HDL levels remained independently associated with CAVD risk (OR 1.027,95% CI 1.017-1.037, P < -0.001) (Table 4).
In addition, logistic regression showed that hypertension, body mass index, hypersensitive C reactive protein and lipoprotein (a) are determinants of CAVD (model 1). After inclusion of the ox-HDL concentration, the ox-HDL was independently correlated with CAVD risk (model 2). Furthermore, the addition of ox-HDL significantly increased the risk predictive effect (AUC 0.703 (0.651-0.751) vs.0.764 (0.715-0.808), P < 0.01) (fig. 1).
TABLE 3 Logistic regression analysis of CAVD patients
Variables of Probability (95% confidence interval) P value
CAD 1.058(0.631–1.772) Is not significant
ox-HDL 1.019(1.012–1.027) <0.001
TABLE 4 Logistic regression analysis after correction of atherosclerotic Risk factors
Variables of OR(95%CI) P value
Blood pressure 2.013(1.126–3.599) 0.018
Diabetes mellitus 0.684(0.395–1.187) Is not significant
Glycated hemoglobin 0.876(0.678–1.132) Is not significant
Triglycerides 0.901(0.730–1.113) Is not significant
Total Cholesterol 1.245(0.873–1.775) Is not significant
High density lipoprotein cholesterol 0.320(0.092–1.107) Is not significant
Low density lipoprotein cholesterol 1.001(0.670–1.495) Is not significant
Lipoprotein (a) 5.232(1.634–16.748) 0.005
Body mass index 1.180(1.090–1.278) <0.001
Hypersensitive C response protein 1.147(1.008–1.305) 0.037
Creatinine 1.001(0.988–1.015) Is not significant
Statins medicine 1.473(0.588–3.691) Is not significant
High density lipoprotein oxide 1.027(1.017–1.037) <0.001
1.6 factors affecting ox-HDL plasma levels
To further investigate potential factors that may affect ox-HDL concentration, general linear analysis and multiple linear regression analysis were employed. General linear correlation analysis showed a positive correlation between ox-HDL and HDL, glycated hemoglobin and lipoprotein (a), and multiple linear regression analysis showed independent correlation between ox-HDL and glycated hemoglobin levels, as shown in Table 5.
TABLE 5 influencing factors of the plasma ox-HDL level
Figure BDA0001860154670000101
Example 2
2.1 preparation of HDL and ox-HDL
Fresh fasting plasma of 10 healthy normal participants was collected and mixed, HDL (1.063-1.210 g/mL) was obtained by density gradient centrifugation, and the detailed procedures were as follows: firstly, placing the blood plasma in an ultracentrifuge, and centrifuging for 5 hours at 500000g and 4 ℃; then placing the HDL obtained by centrifugation in phosphate buffer solution (PBS, pH 7.4) for full dialysis; finally, the dialyzed HDL was filtered through a 0.22 μm pore size filter and stored at 4 ℃ in the dark until used (N-HDL). The concentration of the HDL was determined by determining the concentration of apoA-1 by SDS-PAGE.
Incubating HDL and copper sulfate solution (20 μmol/L) prepared from PBS at 37 deg.C for 24 hr, adding EDTA to stop oxidation reaction, and dialyzing in PBS for 48 hr to obtain ox-HDL for use. The degree of HDL oxidation, expressed as nanomolar amounts of TBARS per milligram of protein, was determined by the TBARS kit.
The TBARS value in ox-HDL is 25.3 +/-5.2 nmol/mg, and the TBARS value in N-HDL is less than 5nmol/mg, which indicates that the in vitro oxidation modification of the N-HDL to generate ox-HDL is successful and is used for the subsequent in vitro induction of AVICs calcification.
2.2 culture of Primary aortic valve stromal cells
Aortic valve leaflets (uncalcified normal leaflets) of 9 patients with heart transplantation were collected and cultured in primary AVICs, specifically: firstly, the valve leaflet is digested by collagenase to eliminate endothelial cells, and then the valve leaflet is cut into 1-2 mm 2 The mass of (2) was treated with DMEM F12 (1) (containing 20% fetal bovine serum, 2 mmol/L-glutamine, 100U/mL penicillin and 100. Mu.g/mL streptomycin) medium at 37 ℃ 5% 2 Culturing in an incubator.
2.3 in vitro Induction of AVICs calcification
To induce calcification, cell cultures were performed in osteogenic medium (containing 15% fetal bovine serum, 50mg/mL ascorbic acid-2-phosphate, 10nM dexamethasone, and 10mM beta-glycerophosphate) with DMEM.
When the cells cultured according to the "culture of 2.2 primary aortic valve stromal cells" method were confluent to 90%, they were grouped as follows: blanks (control, con), N-HDL (50. Mu.g/mL), ox-HDL (10. Mu.g/mL) and ox-HDL (50. Mu.g/mL) were sequentially stimulated with no additives, 50. Mu.g/mLN-HDL, 10. Mu.g/mL ox-HDL and 50. Mu.g/mL ox-HDL, respectively, for two weeks, and the medium was changed every two days.
The preparation method of N-HDL and ox-HDL is described in "2.1 preparation of HDL and ox-HDL".
2.4 detection of results of AVICs calcification
Alizarin Red S staining (Alzarin Red S): fixing the cells with 4% formaldehyde for 30min, washing with distilled water for 3 times, adding 2% alizarin red S (pH 4.1-4.3), and dyeing at room temperature for 30min, wherein the dyeing result is shown in FIG. 2A: alizarin red S positive staining is red/orange, blank (control, con) has obvious red staining, the number of positive staining cells in N-HDL (50 mu g/mL) group is reduced compared with that in blank group, the number of positive staining cells in ox-HDL (10 mu g/mL, 50 mu g/mL) group is increased compared with that in blank group, and the number of positive staining cells is gradually increased along with the increase of the concentration level of ox-HDL.
For quantitative analysis of alizarin red staining result, cells were incubated with cetylpyridinium chloride for 15min to release the dye in the cell matrix, absorbance values of each sample at 540nm wavelength of the spectrophotometer were read, and the quantitative analysis result is shown in fig. 2C: the amount of calcification was reduced in the N-HDL group (50. Mu.g/mL) compared to the control group (Con), resulting in reversal; the calcification amount of ox-HDL (10. Mu.g/mL, 50. Mu.g/mL) increased with the increase of the concentration of ox-HDL, and both were significantly higher than the blank group.
Alizarin red S staining shows that ox-HDL formed by oxidizing modification of N-HDL shows bone-promoting capacity and stimulates AVICs calcium deposition, and the calcification capacity of the ox-HDL is in positive correlation with the concentration of the ox-HDL; while N-HDL reverses AVICs calcium deposition and AVICs calcification.
Alkaline phosphatase ALP activity assay: the alkaline phosphatase activity was measured using a colorimetric kit (Biyuntian, china), and the staining results for alkaline phosphatase activity were obtained by Image-Pro Plus 6.0 photography, and are shown in FIG. 2A: ALP positive staining of alkaline phosphatase is purple, blank (control, con) has obvious purple staining, the number of positive staining cells of N-HDL (50 mu g/mL) group is reduced compared with that of blank group, the number of positive staining cells of ox-HDL (10 mu g/mL and 50 mu g/mL) group is increased compared with that of blank group, and the number of positive staining cells is gradually increased along with the increase of the concentration level of ox-HDL.
The activity of alkaline phosphatase ALP was quantitatively analyzed by p-nitrophenol level in AVICs, absorbance value at 405nm was read and substituted into a standard curve for calculation, and the quantitative analysis result is shown in FIG. 2B: reduction in ALP activity of alkaline phosphatase in the N-HDL group (50. Mu.g/mL) as compared with the control group (Con); ALP activity of ox-HDL group (10. Mu.g/mL, 50. Mu.g/mL) alkaline phosphatase increased with increasing ox-HDL concentration, and both were significantly higher than blank group.
Alizarin red S staining and alkaline phosphatase ALP activity assay showed: the ALP activity of the alkaline phosphatase is related to the calcification of AVICs, and the higher the ALP activity of the alkaline phosphatase, the more remarkable the calcification of the AVICs; ox-HDL can induce differentiation and/or calcification of AVICs in the osteogenic direction by enhancing ALP activity, and this effect is enhanced with increasing concentration of ox-HDL. N-HDL reverses calcification of AVICs by inhibiting ALP activity.
2.5AVICs Calcification-related Gene expression
Total RNA was first extracted with Trizol, after which 5. Mu.g of total RNA was reverse transcribed to cDNA by a reverse transcription kit (Promega, wisconsin, USA). PCR amplification was carried out using Power SYBR Green PCR Master Mix (Applied Biosystems, calif., USA) kit, and amplification was carried out using StepOne systems (Applied Biosystems). The oligonucleotides used in the real-time quantitative fluorescent PCR analysis are all listed in Table 6. The gene expression levels were analyzed using beta-actin as an endogenous reference and StepOne v2.1 software (Applied Biosystems), and the results are shown in FIG. 3.
TABLE 6real-time PCR primers
Figure BDA0001860154670000131
Compared with a blank control (Con), after adding ox-HDL (10 mu g/mL and 50 mu g/mL), BMP2, runx2 and Msx2 gene expression levels are obviously improved, and the BMP2, runx2 and Msx2 gene expression levels are positively correlated with the concentration of ox-HDL.
When N-HDL (50. Mu.g/mL) was added, BMP2, runx2 and Msx2 gene expression levels decreased and N-HDL inhibited BMP2, runx2 and Msx2 gene expression, compared to control (Con).
Combining alizarin red S staining results (2A, 2C), it is known that BMP2, runx2, and Msx2 gene expression levels are related to AVICs calcification, and the higher BMP2, runx2, and Msx2 gene expression levels are, the more significant AVICs calcification is. ox-HDL can induce differentiation and/or calcification of AVICs in the osteogenic direction by increasing BMP2, runx2 and Msx2 gene expression levels, and this effect is enhanced with increasing concentration of ox-HDL. N-HDL reverses AVICs calcification by inhibiting BMP2, runx2 and Msx2 gene expression levels.

Claims (9)

1. The application of oxidized high-density lipoprotein or the detection reagent of the oxidized high-density lipoprotein in the preparation of the calcified aortic valve disease diagnostic agent.
2. The use according to claim 1, wherein the oxidized high density lipoprotein detection reagent is used for detecting the concentration of oxidized high density lipoprotein in serum.
3. A diagnostic agent for calcific aortic valve diseases, comprising a detection reagent for oxidized high-density lipoprotein and/or oxidized high-density lipoprotein.
4. Use of a blocker or inhibitor of oxidized high density lipoprotein in the preparation of a medicament for the treatment of calcified aortic valve disorders.
5. The use according to claim 4, wherein the inhibitor and/or blocker of oxidized high-density lipoprotein as an active molecule for inhibiting and/or reversing calcified aortic valve disorders, inhibiting and/or reversing differentiation and/or calcification of interstitial cells of the aortic valve into osteogenic direction.
6. A drug for treating calcific aortic valve diseases, which comprises an inhibitor or a blocker of oxidized high-density lipoprotein.
7. The oxidized high-density lipoprotein or the detection reagent of the oxidized high-density lipoprotein is used for screening the therapeutic drugs for calcified aortic valve diseases.
8. The use according to claim 7, wherein the oxidized high density lipoprotein is used as a target or marker for screening an inhibitor or a blocker of the oxidized high density lipoprotein.
9. A screening agent for a therapeutic agent for calcified aortic valve diseases, which comprises a detection reagent for oxidized high-density lipoprotein and/or oxidized high-density lipoprotein.
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