Laboratory Medicine ›› 2024, Vol. 39 ›› Issue (3): 227-236.DOI: 10.3969/j.issn.1673-8640.2024.03.004

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Application of CD14 reverse assisted gate method in detection of lymphocyte subsets

JING Lanting1, ZHU Mengting2, YANG Zhenkun1, LUO Yuanyuan1, ZOU Jian1(), YIN Ying1()   

  1. 1. Department of Clinical Laboratory,Wuxi People's Hospital,Nanjing Medical University,Wuxi 214023,Jiangsu,China
    2. School of Medicine,Jiangsu University,Zhenjiang 212013,Jiangsu,China
  • Received:2023-02-10 Revised:2023-11-16 Online:2024-03-30 Published:2024-04-24

Abstract:

Objective To establish CD14 reverse assisted gate method and investigate its application in the detection of lymphocyte subsets. Methods CD14-BV421 antibody was added to the conventional 6-color flow cytometry assay(conventional flow cytometry),and CD14 reverse assisted gate method was established. The lymphocyte subsets of quality control products,samples with different placement times(4,24,48 and 72 h)and patients with different diseases(systemic lupus erythematosus,viral pneumonia and kidney transplantation)were detected by conventional flow cytometry and CD14 reverse assisted gate method,and the difference and deviation of the detection results of the 2 methods were compared. Results The percentage of lymphocytes(LYMPH%)and the percentage of natural killer(NK)cells(NK%)detected by CD14 reverse assisted gate method were lower than those by conventional flow cytometry method(P<0.05),while there was no statistical significance in all the items between the 2 methods(P>0.05). Compared with 4 h,the differentiation between CD14+ monocytes and lymphocytes was decreased with the extension of the sample placement time. Compared with whole blood samples at room temperature for 4 h,the relative deviations of CD14 reverse assisted gate method and conventional flow cytometry were <5% after 24 h(P>0.05). After 48 h of sample placement,the relative deviations of CD14 reverse assisted gate method were all <5%,and the relative deviations of cytotoxic T lymphocyte(CTL)(CD3+CD8+)and B cells(CD3-CD19+)percentages and their absolute values were all >5% by conventional flow cytometry. After 72 h of sample placement,the relative deviation of all the items by the both methods was >10%,which was clinically unacceptable. CD14 reverse assisted gate method can be used to detect lymphocyte subsets in peripheral blood of patients with systemic kidney erythematosus,viral pneumonia and kidney transplantation,which could better distinguish lymphocytes from monocytes and reduce the influence of atypical monocytes on NK% and the absolute value of NK cells. Conclusions CD14 reverse assisted gate method can reduce the wrong loop of lymphocyte gate in flow cytometry and improve the detection accuracy.

Key words: CD14, Reverse assisted gate method, Lymphocyte subset, Flow cytometry

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