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Study of KIR gene expression at the mRNA level in specific donor-derived NK cells after allogeneic HSCT

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Abstract

The function of natural killer (NK) cells after allogeneic hematopoietic stem cell transplantation (allo-HSCT) is regulated by the balance between inhibitory KIRs (iKIRs) and activating KIRs (aKIRs). However, few studies have examined the subsequent expression of KIR genes unique to the donor. We defined the set of KIR genes expressed only in the donor and designed a method for measuring the expression of these KIR genes by quantitative real-time polymerase chain reaction (RT-qPCR) based on genetic cloning techniques. In this study, we evaluated the recovery pattern of KIR genes in 252 donor-recipient pairs. The expression of each KIR unique to the donor was in line with that of KIR genes shared by the donor and recipient, such as KIR2DS1, KIR3DS1, KIR2DS4, or KIR2DS3. The timing of the peak mRNA expression of aKIRs unique to the donor was inconsistent but occurred within the first 3 months posttransplantation, whereas the peak mRNA expression of iKIRs was consistently observed in the third month after transplantation. The expression of KIR2DL2 in the third month posttransplantation was significantly higher in the transplant recipients than in the donors (p = 0.01). The KIR2DL1 and KIR3DL1 levels in the transplant recipients in the second and third months posttransplantation were also obviously higher than the donor levels (p < 0.0001). Thus, these observations should be considered when attempting to predict the correlation between mRNA expression and prognosis after allo-HSCT.

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Funding

This work was supported by the National Natural Science Foundation of China (Grant No. 81671549), the Jiangsu Province Medical Innovation Team (CXTDB2017009), the Jiangsu Provincial Key Research and Development Program (BE2019656), and the Collaborative Innovation Center of Hematology (SX21100117).

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Correspondence to Jun He.

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This protocol was approved by the local ethics committee. In accordance with the ethical guidelines of the Declaration of Helsinki; written informed consent was obtained from all the subjects.

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The authors declare that they have no conflict of interest.

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Li, Y., Wang, T., Hu, X. et al. Study of KIR gene expression at the mRNA level in specific donor-derived NK cells after allogeneic HSCT. Immunogenetics 72, 135–141 (2020). https://doi.org/10.1007/s00251-019-01153-6

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  • DOI: https://doi.org/10.1007/s00251-019-01153-6

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