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Blood, 1 September 2001, Vol. 98, No. 5, pp. 1607-1613
TRANSPLANTATION
Targeting Janus kinase 3 to attenuate the severity of acute
graft-versus-host disease across the major histocompatibility barrier
in mice
Marina Cetkovic-Cvrlje,
Bertram A. Roers,
Barbara Waurzyniak,
Xing-Ping Liu, and
Fatih M. Uckun
From the Experimental BMT Program, Parker Hughes Cancer
Center, and the Departments of Immunology, Pathology, Chemistry, and
Drug Discovery Program, Parker Hughes Institute, St Paul, MN.
To prevent the development of acute graft-versus-host disease
(GVHD) in lethally irradiated C57BL/6 (H-2b)
recipient mice transplanted with bone marrow-splenocyte grafts from major histocompatibility complex (MHC) disparate BALB/c mice (H-2d), recipient mice were treated with the rationally
designed JAK3 inhibitor WHI-P131
[4-(4'-hydroxyphenyl)-amino-6,7-dimethoxyquinazoline] (20 mg/kg, 3 times a day [tid]) daily from the day of bone marrow transplantation
(BMT) until the end of the 85-day observation period. Total body
irradiation (TBI)-conditioned, vehicle-treated control C57BL/6 mice
(n = 38) receiving bone marrow-splenocyte grafts from BALB/c mice
survived acute TBI toxicity, but they all developed histologically
confirmed severe multi-organ GVHD and died after a median survival time
of 37 days. WHI-P131 treatment (20 mg/kg intraperitoneally, tid)
prolonged the median survival time of the BMT recipients to 56 days.
The probability of survival at 2 months after BMT was 11% ± 5% for
vehicle-treated control mice (n = 38) and 41% ± 9% for mice
treated with WHI-P131 (n = 32) (P < .0001). Notably,
the combination regimen WHI-P131 plus the standard anti-GVHD drug
methotrexate (MTX) (10 mg/m2 per day) was more effective
than WHI-P131 or MTX alone. More than half the C57BL/6 recipients
receiving this most effective GVHD prophylaxis remained alive and
healthy throughout the 85-day observation period, with a cumulative
survival probability of 70% ± 10%. Taken together, these results
indicate that targeting JAK3 in alloreactive donor lymphocytes with a
chemical inhibitor such as WHI-P131 may attenuate the severity of GVHD
after BMT.

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