Laboratory Medicine ›› 2024, Vol. 39 ›› Issue (7): 621-626.DOI: 10.3969/j.issn.1673-8640.2024.07.001

    Next Articles

Correlation between Lp-PLA2 gene polymorphism and histopathological staining of carotid plaque

LIU Yadong1, YANG Lei2, SONG Shaoting1, DU Xiong3, LIU Qiang4, SUN Jianrong5()   

  1. 1. Department of Clinical Laboratory,the Affiliated Hospital of Yan'an University,Yan'an 716000,Shaanxi,China
    2. Emergency Department,the Affiliated Hospital of Yan'an University,Yan'an 716000,Shaanxi,China
    3. Department of Pathology,the Affiliated Hospital of Yan'an University,Yan'an 716000,Shaanxi,China
    4. Department of Neurology,the Affiliated Hospital of Yan'an University,Yan'an 716000,Shaanxi,China
    5. Department of Geriatric Respiratory,the Affiliated Hospital of Yan'an University,Yan'an 716000,Shaanxi,China
  • Received:2023-12-21 Revised:2024-03-06 Online:2024-07-30 Published:2024-07-31

Abstract:

Objective To investigate the correlation between the histopolymorphism of lipoprotein-associated phospholipase A2 (Lp-PLA2) gene and the results of histopathological staining of carotid plaque. Methods A total of 135 patients who underwent carotid artery dissection in the Affiliated Hospital of Yan'an University from January 2021 to October 2023 were enrolled. The clinical and drug use data were collected from all the patients. Serum total cholesterol (TC),triglyceride (TG),high-density lipoprotein cholesterol (HDL-C),low-density lipoprotein cholesterol (LDL-C),homocysteine (Hcy),lipoprotein (a) [Lp (a)],high-sensitivity C-reactive protein (hs-CRP),Lp-PLA2 level and Lp-PLA2 gene R92H,V297F,A379V polymorphisms were determined. Von kossa staining,α-SMA,oil red O staining,EVG staining and CD68+ immunohistochemical staining were performed on the carotid plaque. According to the results of Lp-PLA2 gene polymorphism determination,all the patients were classified into control group (no mutation at R92H,A379V and V297F sites),A379V group (only mutation at A379V site),V297F group (only mutation at V297F site) and R92H group (only mutation at R92H site). Spearman correlation analysis was used to evaluate the correlation with histopathological staining of carotid plaque. Logistic regression analysis was used to evaluate the effect of Lp-PLA2 gene polymorphism on carotid plaque histopathological staining results. Results There was statistical significance in age and serum levels of HDL-C,LDL-C and Lp-PLA2 among control group,A379V group,V297F group and R92H group (P<0.05),while there was no statistical significance in the other indicators among the 4 groups(P>0.05). The positive percentages of calcified and necrotic nuclei,fat,elastic fiber,collagen fiber and macrophage in the carotid plaque of control group,A379V group,V297F group and R92H group were statistically significant(P<0.05). There was no statistical significance in the positive percentage of smooth muscle cells among the 4 groups(P>0.05). There was a positive correlation between Von kossa staining and CD68+ immunohistochemical staining in R92H group (r=0.819,P=0.025),and there was no correlation between the other histopathological staining results (P>0.05). There was no correlation among the histopathological staining results in control group,A379V group and V297F group (P>0.05). After adjusting age and serum HDL-C,LDL-C and Lp-PLA2,Lp-PLA2 gene R92H site mutation was an independent risk factor for increased calcification and necrotic nucleus positive percentage and macrophage positive percentage in carotid plaque [odds ratios (OR) were 1.97 and 1.26,95% confidence intervals(CI)were 1.56- 2.19 and 1.06-1.53,respectively,P<0.05]. Conclusions Lp-PLA2 gene R92H site mutation can affect the stability of carotid plaque and increase the risk of plaque rupture. Clinical attention should be paid to Lp-PLA2 gene R92H site mutation population.

Key words: Lipoprotein-associated phospholipase A2, Gene polymorphism, Carotid plaque, Pathological staining

CLC Number: