Loss of expression of LyGDI (ARHGDIB), a rho GDP-dissociation inhibitor, in Hodgkin lymphoma.
The guanosine triphosphatase (GTPase) inhibitor LyGDI (ARHGDIB, Ly/D4-GDI, RhoGDIb or RhoGDI 2) is abundantly expressed in haematopoetic cells and possibly plays a role in the onset of apoptosis. Gene expression profiling of Hodgkin cell lines revealed that LyGDI expression was downregulated in these cell lines. The present study evaluated the expression of LyGDI in Hodgkin cells in vivo and studied the function of LyGDI in Hodgkin cell lines in vitro. Our results showed that virtually all Hodgkin and Reed-Sternberg cells in classical Hodgkin lymphoma lacked LyGDI protein expression. On the other hand, almost all non-Hodgkin lymphomas, except for anaplastic large cell lymphomas, expressed LyGDI protein. Transfection of the classical Hodgkin cell line L428 with a vector containing full-length LyGDI-induced apoptosis in a subset of cells. However, the majority of Hodgkin cells with transgenic expression of LyGDI escaped apoptosis. Our data show that lack of LyGDI expression is a frequent feature of cHL but that it is not of vital importance for the growth and survival of these cells.
Ma
Liya
L
Department of Pathology, Schleswig-Holstein University Hospitals, Kiel, Germany.
Xu
Gaixiang
G
Sotnikova
Anna
A
Szczepanowski
Monika
M
Giefing
Maciej
M
Krause
Kristina
K
Krams
Matthias
M
Siebert
Reiner
R
Jin
Jie
J
Klapper
Wolfram
W
D017209:Apoptosis; D045744:Cell Line, Tumor; D005434:Flow Cytometry; D005786:Gene Expression Regulation; D020730:Guanine Nucleotide Dissociation Inhibitors / Q000032:analysis / Q000235:genetics*; D006689:Hodgkin Disease / Q000378:metabolism* / Q000473:pathology; D006801:Humans; D007150:Immunohistochemistry; D008228:Lymphoma, Non-Hodgkin / Q000378:metabolism / Q000473:pathology; D015735:Mifepristone / Q000494:pharmacology; D016539:Reed-Sternberg Cells / Q000378:metabolism* / Q000473:pathology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014162:Transfection; D019076:Transgenes; D025521:Tumor Suppressor Proteins / Q000032:analysis / Q000235:genetics*; D062948:rho Guanine Nucleotide Dissociation Inhibitor alpha; D062949:rho Guanine Nucleotide Dissociation Inhibitor beta; D062947:rho-Specific Guanine Nucleotide Dissociation Inhibitors
C569638:ARHGDIA protein, human; C569658:ARHGDIB protein, human; D020730:Guanine Nucleotide Dissociation Inhibitors; D025521:Tumor Suppressor Proteins; D062948:rho Guanine Nucleotide Dissociation Inhibitor alpha; D062949:rho Guanine Nucleotide Dissociation Inhibitor beta; D062947:rho-Specific Guanine Nucleotide Dissociation Inhibitors; D015735:Mifepristone