TY - JOUR
T1 - Combination therapy for adult T-cell leukemia-xenografted mice
T2 - Flavopiridol and anti-CD25 monoclonal antibody
AU - Zhang, Meili
AU - Zhang, Zhuo
AU - Goldman, Carolyn K.
AU - Janik, John
AU - Waldmann, Thomas A.
PY - 2005/2/1
Y1 - 2005/2/1
N2 - Adult T-cell leukemia (ATL) develops in a small proportion of individuals infected with human T-cell lymphotrophic virus-1. The leukemia consists of an overabundance of activated T cells, which express CD25 on their cell surfaces. Presently, there is no accepted curative therapy for ATL. Flavopiridol, an inhibitor of cyclin-dependent kinases, has potent antiproliferative effects and antitumor activity. We investigated the therapeutic efficacy of flavopiridol alone and in combination with humanized anti-Tac antibody (HAT), which recognizes CD25, in a murine model of human ATL. The ATL model was established by intraperitoneal injection of MET-1 leukemic cells into nonobese diabetic/severe combined immunodeficient mice. Either flavopiridol, given 2.5 mg/kg body weight daily for 5 days, or HAT, given 100 μg weekly for 4 weeks, inhibited tumor growth as monitored by serum levels of human β-2-microglobulin (β2μ; P < .01), and prolonged survival of the leukemia-bearing mice (P < .05) as compared with the control group. Combination of the 2 agents dramatically enhanced the antitumor effect, as shown by both β2μ levels and survival of the mice, when compared with those in the flavopiridol or HAT alone group (P < .01). The significantly improved therapeutic efficacy by combining flavopiridol with HAT provides support for a clinical trial in the treatment of ATL.
AB - Adult T-cell leukemia (ATL) develops in a small proportion of individuals infected with human T-cell lymphotrophic virus-1. The leukemia consists of an overabundance of activated T cells, which express CD25 on their cell surfaces. Presently, there is no accepted curative therapy for ATL. Flavopiridol, an inhibitor of cyclin-dependent kinases, has potent antiproliferative effects and antitumor activity. We investigated the therapeutic efficacy of flavopiridol alone and in combination with humanized anti-Tac antibody (HAT), which recognizes CD25, in a murine model of human ATL. The ATL model was established by intraperitoneal injection of MET-1 leukemic cells into nonobese diabetic/severe combined immunodeficient mice. Either flavopiridol, given 2.5 mg/kg body weight daily for 5 days, or HAT, given 100 μg weekly for 4 weeks, inhibited tumor growth as monitored by serum levels of human β-2-microglobulin (β2μ; P < .01), and prolonged survival of the leukemia-bearing mice (P < .05) as compared with the control group. Combination of the 2 agents dramatically enhanced the antitumor effect, as shown by both β2μ levels and survival of the mice, when compared with those in the flavopiridol or HAT alone group (P < .01). The significantly improved therapeutic efficacy by combining flavopiridol with HAT provides support for a clinical trial in the treatment of ATL.
UR - http://www.scopus.com/inward/record.url?scp=12844277942&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=12844277942&partnerID=8YFLogxK
U2 - 10.1182/blood-2004-05-1709
DO - 10.1182/blood-2004-05-1709
M3 - Article
C2 - 15383455
AN - SCOPUS:12844277942
SN - 0006-4971
VL - 105
SP - 1231
EP - 1236
JO - Blood
JF - Blood
IS - 3
ER -