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PTPN21‐CDS long isoform inhibits the response of acute lymphoblastic leukemia cells to NK‐mediated lysis via the KIR/HLA‐I axis
Author(s) -
Wang Huafang,
Zhu Ni,
Ye Xiaohang,
Wang Limengmeng,
Wang Binsheng,
Shan Wei,
Lai Xiaoyu,
Tan Yamin,
Fu Shan,
Xiao Haowen,
Huang He
Publication year - 2020
Publication title -
journal of cellular biochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.028
H-Index - 165
eISSN - 1097-4644
pISSN - 0730-2312
DOI - 10.1002/jcb.29601
Subject(s) - gene isoform , biology , microbiology and biotechnology , protein tyrosine phosphatase , haematopoiesis , transcriptome , sanger sequencing , receptor , stem cell , gene , genetics , gene expression , mutation
Protein tyrosine phosphatase non‐receptor type 21 (PTPN21) is a member of the non‐receptor tyrosine phosphatase family. We have found that PTPN21 is mutated in relapsed Philadelphia chromosome‐negative acute lymphoblastic leukemia (ALL) after allogeneic hematopoietic stem cell transplantation. PTPN21 consists of three types of isoforms according to the length of the protein encoded. However, the roles of different isoforms in leukemic cells have not been elucidated. In the study, PTPN21 isoform constitution in five ALL cell lines were identified by transcriptome polymerase chain reaction combined with Sanger sequencing, and the relationship between PTPN21 isoforms and sensitivity to natural killer (NK) cells mediated killing in ALL cell lines were further assessed by knock‐out of different isoforms of PTPN21 using CRISPR‐Cas9 technique. Subsequently, we explored the functional mechanisms through RNA sequencing and confirmatory testing. The results showed that there was no significant change when all PTPN21 isoforms were knocked out in ALL cells, but the sensitivity of NALM6 cells with PTPN21‐CDS long knock‐out (NALM6‐PTPN21 lk ) to NK‐mediated killing was significantly increased. Whole transcriptome sequencing and further validation testing showed that human leukocyte antigen class I (HLA‐I) molecules were significantly decreased, accompanied by a significantly downregulated expression of antigen presenting‐related chaperones in NALM6‐PTPN21 lk cells. Our results uncovered a previously unknown mechanism that PTPN21‐CDS long and CDS short isoforms may play opposite roles in NK‐mediated killing in ALL cells, and showed that the endogenous PTPN21‐CDS long isoform inhibited ALL cells to NK cell‐mediated lysis by regulating the KIR‐HLA‐I axis.