Pro-apoptotic and antiproliferative activity of human KCNRG, a putative tumor suppressor in 13q14 region.
Deletion of 13q14.3 and a candidate gene KCNRG (potassium channel regulating gene) is the most frequent chromosomal abnormality in B-cell chronic lymphocytic leukemia and is a common finding in multiple myeloma (MM). KCNRG protein may interfere with the normal assembly of the K+ channel proteins causing the suppression of Kv currents. We aimed to examine possible role of KCNRG haploinsufficiency in chronic lymphocytic leukemia (CLL) and MM cells. We performed detailed genomic analysis of the KCNRG locus; studied effects of the stable overexpression of KCNRG isoforms in RPMI-8226, HL-60, and LnCaP cells; and evaluated relative expression of its transcripts in various human lymphomas. Three MM cell lines and 35 CLL PBL samples were screened for KCNRG mutations. KCNRG exerts growth suppressive and pro-apoptotic effects in HL-60, LnCaP, and RPMI-8226 cells. Direct sequencing of KCNRG exons revealed point mutation delT in RPMI-8226 cell line. Levels of major isoform of KCNRG mRNA are lower in DLBL lymphomas compared to normal PBL samples, while levels of its minor mRNA are decreased across the broad range of the lymphoma types. The haploinsufficiency of KCNRG might be relevant to the progression of CLL and MM at least in a subset of patients.
Molecular Biology and Microbiology Department, College of Science, George Mason University, David King Hall, MSN 3E1, Fairfax, VA 22030, USA.
Aybike
A
Birerdinc
Elizabeth
E
Nohelty
Andrey
A
Marakhonov
Ganiraju
G
Manyam
Ivan
I
Panov
Stephanie
S
Coon
Eugene
E
Nikitin
Mikhail
M
Skoblov
Vikas
V
Chandhoke
Ancha
A
Baranova
D000818:Animals; D017209:Apoptosis; D002465:Cell Movement; D049109:Cell Proliferation; D002874:Chromosome Mapping; D002882:Chromosomes, Human, Pair 13; D016147:Genes, Tumor Suppressor; D018922:HL-60 Cells; D006801:Humans; D015451:Leukemia, Lymphocytic, Chronic, B-Cell / Q000235:genetics; D051379:Mice; D009101:Multiple Myeloma / Q000235:genetics; D009361:Neoplasm Invasiveness; D016133:Polymerase Chain Reaction; D015221:Potassium Channels / Q000235:genetics* / Q000502:physiology; D020033:Protein Isoforms; D012333:RNA, Messenger / Q000032:analysis; D051381:Rats
C473317:KCNRG protein, human; D015221:Potassium Channels; D020033:Protein Isoforms; D012333:RNA, Messenger