Abstract
In the present study, Hu-Mikβ 1, a humanized mAb directed at the shared IL-2/IL-15Rβ subunit (CD122) was evaluated in patients with T-cell large granular lymphocytic (T-LGL) leukemia. Hu-Mikβ 1 blocked the trans presentation of IL-15 to T cells expressing IL-2/IL-15Rβ and the common γ -chain (CD132), but did not block IL-15 action in cells that expressed the heterotrimeric IL-15 receptor in cis. There was no significant toxicity associated with Hu-Mikβ 1 administration in patients with T-LGL leukemia, but no major clinical responses were observed. One patient who had previously received murine Mikβ 1 developed a measurable Ab response to the infused Ab. Nevertheless, the safety profile of this first in-human study of the humanized mAb to IL-2/IL-15Rβ (CD122) supports its evaluation in disorders such as refractory celiac disease, in which IL-15 and its receptor have been proposed to play a critical role in the pathogenesis and maintenance of disease activity. The protocol is registered with www.clinicaltrials.gov as number NCT 00076180.
Original language | English |
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Pages (from-to) | 476-484 |
Number of pages | 9 |
Journal | Blood |
Volume | 121 |
Issue number | 3 |
DOIs | |
State | Published - 17 Jul 2013 |
Externally published | Yes |