Expression of Bruton's tyrosine kinase in B lymphoblastoid cell lines from X-linked agammaglobulinaemia patients

被引:14
作者
DeWeers, M
Dingjan, GM
Brouns, GS
Kraakman, MEM
Mensink, RGJ
Lovering, RC
Schuurman, RKB
Borst, J
Hendriks, RW
机构
[1] ERASMUS UNIV ROTTERDAM,DEPT CELL BIOL & GENET,NL-3000 DR ROTTERDAM,NETHERLANDS
[2] UNIV LEIDEN HOSP,NL-2300 RC LEIDEN,NETHERLANDS
[3] NETHERLANDS CANC INST,DIV CELLULAR BIOCHEM,NL-1066 CX AMSTERDAM,NETHERLANDS
[4] INST CHILD HLTH,MOL IMMUNOL UNIT,LONDON,ENGLAND
关键词
Bruton's tyrosine kinase; X-linked agammaglobulinaemia; B lymphoblastoid cell lines; X-linked immunodeficiency;
D O I
10.1111/j.1365-2249.1997.296-ce1185.x
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
X-linked agammaglobulinaemia (XLA) is an immunodeficiency caused by mutations in Bruton's tyrosine kinase (Btk) and is characterized by ail almost complete arrest of B cell development. We analysed expression of Btk in B lymphoblastoid cell lines (BLCL) derived from four unrelated XLA patients. In one patient, with a 3.5 kb genomic deletion encompassing the first (untranslated) exon, mRNA levels and in vitro kinase activities were very low. The patient manifested a mild phenotype with a delayed onset of the disease. Another mutation: in which the intron 3 donor splice site is lost, was also associated with very low mRNA levels and an absence of detectable Btk protein. Patients with this mutation showed extensive heterogeneity of the immunological phenotype. In the BLCL of a third patient, with an Arg(288) substitution in the SH2 domain, the mutation did not appear to affect the expression level, nor to abrogate in vitro phosphorylation activity. In the BLCL of the fourth patient, with an Arg(28) mutation in the PH domain, tyrosine kinase activity in BTK precipitates appeared to be decreased compared with control BLCL.
引用
收藏
页码:235 / 240
页数:6
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