Immunohistochemical studies of protein kinase D (PKD) 2 expression in malignant human lymphomas.
OBJECTIVE
To study the PKD2 expression, autophosphorylation and localization in reactive lymph nodes and tumors of lymphoid tissues.


METHODS
Specific antibodies, which recognize PKD1/2 or PKD2 and autophosphorylated PKD1/2, were used for immunohistochemical and biochemical studies of tonsils, reactive lymph nodes, tumor samples of non-Hodgkin's lymphoma (NHL) and Hodgkin's lymphoma (HL).


RESULTS
Immunohistochemical and biochemical analysis of PKD1 and PKD2 expression showed PKD2 expression in tonsils, reactive lymph nodes and tumor tissues from patients with NHL and HL. Furthermore, we were not able to reveal PKD1 expression in studied lymphoid tissues. In tonsils and reactive lymph nodes the PKD2 expression was detected in T and B cell zones with highest level in germinal centers of lymphoid follicles and the maximum level of autophosphorylation in the light zones of the germinal centers. We found that low level of PKD2 expression and autophosphorylation was characteristic feature for mantle cell lymphomas, Burkitt's lymphomas, and in 50% of CLL/small lymphocytic lymphomas. Lymphoma cells of germinal center origin and with activated B cell phenotype (diffuse large B cell lymphomas, HL) and anaplastic large cells lymphoma demonstrated the high level of PKD2 expression and autophosphorylation.


CONCLUSIONS
The level of PKD2 expression and autophosphorylation in neoplastic cells corresponds to the expression pattern of this kinase in their normal analogs, and to the level of cell differentiation and activation.
Kovalevska
L M
LM
Signal Transductions Laboratory, R.E. Kavetsky Institute of Experimental Pathology, Oncology and Radiobiology, NAS of Ukraine, Ukraine.
Yurchenko
O V
OV
Shlapatska
L M
LM
Berdova
G G
GG
Mikhalap
S V
SV
Van Lint
J
J
Sidorenko
S P
SP
D006689:Hodgkin Disease / Q000201:enzymology* / Q000473:pathology; D006801:Humans; D007150:Immunohistochemistry; D008198:Lymph Nodes / Q000201:enzymology; D008228:Lymphoma, Non-Hodgkin / Q000201:enzymology* / Q000473:pathology; D014066:Palatine Tonsil / Q000201:enzymology; D010766:Phosphorylation; D011493:Protein Kinase C / Q000032:analysis; D000091283:Protein Kinase D2; D011494:Protein Kinases / Q000032:analysis*
D000091283:Protein Kinase D2; D011494:Protein Kinases; C089212:protein kinase D; D011493:Protein Kinase C