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Volume 38 Issue 2
Feb.  2022
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Article Navigation >  CHINESE JOURNAL OF BURNS AND WOUNDS  > 2022  >  38(2): 147-155
Qi XX,Liu L,Yang YX,et al.Changes of heparin-binding protein in severe burn patients during shock stage and its effects on human umbilical vein endothelial cells and neutrophils[J].Chin J Burns Wounds,2022,38(2):147-155.DOI: 10.3760/cma.j.cn501120-20210805-00269.
Citation: Qi XX,Liu L,Yang YX,et al.Changes of heparin-binding protein in severe burn patients during shock stage and its effects on human umbilical vein endothelial cells and neutrophils[J].Chin J Burns Wounds,2022,38(2):147-155.DOI: 10.3760/cma.j.cn501120-20210805-00269.
shu

Changes of heparin-binding protein in severe burn patients during shock stage and its effects on human umbilical vein endothelial cells and neutrophils

doi: 10.3760/cma.j.cn501120-20210805-00269
  • 1.

    School of Medicine, Jiangsu University, Zhenjiang 212001, China

  • 2.

    Department of Burns and Plastic Surgery, Affiliated Suzhou Hospital of Nanjing Medical University, Suzhou 215002, China

Funds:

General Program of National Natural Science Foundation of China 81772135, 82072217

Natural Science Foundation of Jiangsu Province of China BK20201178

More Information
  • Corresponding author: Sun Bingwei, Email: sunbinwe@hotmail.com
  • Received Date: 2021-08-05
    Abstract
  •   Objective  To investigate the changes of heparin-binding protein (HBP) in severe burn patients during shock stage and its effects on human umbilical vein endothelial cells (HUVECs) and neutrophils in vitro.  Methods  Prospective observational and experimental research methods were used. Twenty severe burn patients who met the inclusion criteria and were admitted to the Department of Burns and Plastic Surgery of Affiliated Suzhou Hospital of Nanjing Medical University from August to November 2020 were included in severe burn group (12 males and 8 females, aged 44.5 (31.0, 58.0) years). During the same period, 20 healthy volunteers with normal physical examination results in the unit's Physical Examination Center were recruited into healthy control group (13 males and 7 females, aged 39.5 (26.0, 53.0) years). Enzyme-linked immunosorbent assay (ELISA) method was used to detect the protein expression levels of HBP and tissue inhibitor of metalloproteinase 1 (TIMP-1) in plasma of patients within 48 hours after injury in severe burn group and in plasma of volunteers in healthy control group. The correlation between protein expression of HBP and that of TIMP-1 in the plasma in the two groups was analyzed by Pearson correlation analysis. The fourth passage of HUVECs in logarithmic growth phase were used for the experiment. The HUVECs were divided into normal control group with routine culture (the same treatment below) and recombinant HBP (rHBP)-treated 12 h group, rHBP-treated 24 h group, and rHBP-treated 48 h group with corresponding treatment according to the random number table (the same grouping method below), and the mRNA expression of TIMP-1 in cells was detected by real-time fluorescence quantitative reverse transcription polymerase chain reaction. The HUVECs were divided into normal control group and rHBP-treated 48 h group with corresponding treatment, and the protein expression of TIMP-1 in the cells was detected by Western blotting. The HUVECs were divided into normal control group, rHBP alone group, aprotinin alone group, and rHBP+aprotinin group treated with the corresponding reagents (with the final molarity of rHBP being 200 nmol/L and the final concentration of aprotinin being 20 μg/mL, respectively), cultured for 48 h, and ELISA was used to detect the protein expression of TIMP-1 in the culture supernatant of cells. The neutrophils were isolated from the peripheral venous blood of the aforementioned 10 healthy volunteers by immunomagnetic bead sorting, and the cells were divided into normal control group, recombinant TIMP-1 (rTIMP-1) alone group, phorbol acetate (PMA) alone group, and rTIMP-1+PMA group treated with corresponding reagents (with the final concentration of rTIMP-1 being 500 ng/mL and the final molarity of PMA being 10 nmol/L, respectively). After being cultured for 1 h, the expression of CD63 protein in cells was detected by immunofluorescence method, the positive expression rate of CD63 protein in cells was detected by flow cytometry, and the protein expression levels of HBP and myeloperoxidase (MPO) in the culture supernatant of cells were detected by ELISA. The normal control group underwent the above-mentioned related tests at appropriate time points. The number of samples was 3 in each group of cell experiment. Data were statistically analyzed with chi-square test, Mann-Whitney U test, Kruskal-Wallis H test, and Tamhane's T2 test.  Results  The protein expression levels of HBP and TIMP-1 in the plasma of patients in severe burn group were 404.9 (283.1, 653.2) and 262.1 (240.6, 317.4) ng/mL, respectively, which were both significantly higher than 61.6 (45.0, 68.9) and 81.0 (66.3, 90.0) ng/mL of volunteers in healthy control group (with Z values of -5.41 and -5.21, respectively, P<0.01). The correlation between the protein expression of HBP and that of TIMP-1 in the plasma of volunteers in healthy control group was not strong (P>0.05). The protein expression of HBP was significantly positively correlated with that of TIMP-1 in the plasma of patients in severe burn group (r=0.64, P<0.01). Compared with that in normal control group, the mRNA expression of TIMP-1 in HUVECs was significantly increased in rHBP-treated 12 h group, rHBP-treated 24 h group, and rHBP-treated 48 h group (with t values of -3.58, -2.25, and -1.26, respectively, P<0.05). Western blotting detection showed that compared with that in normal control group, the protein expression of TIMP-1 in HUVECs in rHBP-treated 48 h group was significantly enhanced. After 48 h of culture, compared with that in normal control group, the protein expression level of TIMP-1 in the culture supernatant of HUVECs in rHBP alone group was significantly increased (t=9.43, P<0.05), while the protein expression level of TIMP-1 in the culture supernatant of HUVECs didn't change significantly in aprotinin alone group or rHBP+aprotinin group (P>0.05); compared with that in rHBP alone group, the protein expression level of TIMP-1 in the culture supernatant of HUVECs in rHBP+aprotinin group was significantly decreased (t=4.76, P<0.01). After 1 h of culture, the trend of CD63 protein expression in neutrophils detected by immunofluorescence method and that by flow cytometry were consistent in each group. After 1 h of culture, compared with that in normal control group, the positive expression rate of CD63 protein in the neutrophils and the protein expression levels of HBP and MPO in the culture supernatant of cells in rTIMP-1 alone group all had no significant changes (P>0.05), while the positive expression rate of CD63 protein in the neutrophils and the protein expression levels of HBP and MPO in the culture supernatant of cells were all significantly increased in PMA alone group and rTIMP-1+PMA group (with t values of 2.41, 3.82, 5.73, 1.05, 4.16, and 1.08, respectively, P<0.05 or P<0.01); compared with that in PMA alone group, the positive expression rate of CD63 protein in the neutrophils and the protein expression levels of HBP and MPO in the culture supernatant of cells in rTIMP-1+PMA group were all significantly decreased (with t values of 5.26, 2.83, and 1.26, respectively, P<0.05 or P<0.01).  Conclusions  The expression level of HBP in the plasma of severe burn patients is increased during shock stage. HBP can induce HUVECs to secrete TIMP-1 in vitro, and TIMP-1 can reduce the expression of CD63 molecule in human neutrophils.

     

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