D1 and D2 dopamine receptor-mediated inhibition of activated normal T cell proliferation is lost in jurkat T leukemic cells.
Dopamine is a catecholamine neurotransmitter, which plays an important role in the regulation of T cell functions. In activated T cells from normal volunteers, stimulation of D(1) and D(2) dopamine receptors inhibit cell proliferation and cytokine secretion. However, there is no report yet regarding the regulatory role of D(1) and D(2) dopamine receptors in abnormally proliferating T cells. The present study investigates the expression and effect of activation of these dopamine receptors in Jurkat cells, a leukemic T cell line showing uncontrolled proliferation. Like normal human T cells, in Jurkat cells, D(1) and D(2) dopamine receptors are also expressed; however, unlike activated normal T cells, stimulation of these dopamine receptors in Jurkat cells fails to inhibit their T cell receptor-induced proliferation. This alteration is due to failure of D(1) dopamine receptor-mediated activation of cyclic AMP signaling and a missense mutation at the third cytoplasmic loop of D(2) dopamine receptors affecting inhibition of phosphorylation of ZAP-70, an important downstream protein transducing signal from the T cell receptor. These results help to understand the biology of abnormal proliferation of T cells in pathophysiological conditions where dopamine plays an important role.
Basu
Biswarup
B
Department of Signal Transduction and Biogenic Amines, Chittaranjan National Cancer Institute, Kolkata 700026, India.
Sarkar
Chandrani
C
Department of Pathology, Ohio State University, Columbus, Ohio 43210.
Chakroborty
Debanjan
D
Department of Pathology, Ohio State University, Columbus, Ohio 43210.
Ganguly
Subhalakshmi
S
Department of Signal Transduction and Biogenic Amines, Chittaranjan National Cancer Institute, Kolkata 700026, India.
Shome
Saurav
S
Department of Signal Transduction and Biogenic Amines, Chittaranjan National Cancer Institute, Kolkata 700026, India.
Dasgupta
Partha Sarathi
PS
Department of Signal Transduction and Biogenic Amines, Chittaranjan National Cancer Institute, Kolkata 700026, India. Electronic address: partha42002@yahoo.com.
Basu
Sujit
S
Department of Pathology, Ohio State University, Columbus, Ohio 43210; Arthur G. James Comprehensive Cancer Center, Ohio State University, Columbus, Ohio 43210. Electronic address: sujit.basu@osumc.edu.
D049109:Cell Proliferation / Q000187:drug effects*; D016207:Cytokines / Q000378:metabolism; D004298:Dopamine / Q000378:metabolism / Q000494:pharmacology*; D015259:Dopamine Agents / Q000378:metabolism / Q000494:pharmacology*; D015973:Gene Expression Regulation, Leukemic / Q000187:drug effects; D006801:Humans; D019169:Jurkat Cells; D008213:Lymphocyte Activation / Q000187:drug effects; D010766:Phosphorylation / Q000187:drug effects; D017447:Receptors, Dopamine D1 / Q000235:genetics / Q000378:metabolism*; D017448:Receptors, Dopamine D2 / Q000235:genetics / Q000378:metabolism*; D015398:Signal Transduction / Q000187:drug effects*; D013601:T-Lymphocytes / Q000378:metabolism*; D051746:ZAP-70 Protein-Tyrosine Kinase / Q000235:genetics / Q000378:metabolism
D016207:Cytokines; D015259:Dopamine Agents; D017447:Receptors, Dopamine D1; D017448:Receptors, Dopamine D2; D051746:ZAP-70 Protein-Tyrosine Kinase; C497261:ZAP70 protein, human; D004298:Dopamine