Immunotherapy for neuroblastoma elicits a complement dependent whole body allodynia
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Linda S. Sorkin
GD2 ganglioside is found on plasma membranes of tumor cells of neuroectodermal origin, including neuroblastoma cells. A chimeric antibody against GD2 (ch14.18) is currently being used as a treatment for pediatric neuroblastoma. Intravenous administration of the antibody induces severe whole body allodynia in patients which lasts from 24 to 48 h. Similar administration of antibody to rats produces tactile, but not thermal sensitivity, whole body touch evoked agitation as well as ectopic activation of identified C nociceptors in the sural nerve. Both the peripheral nerve firing and patient allodynia are sensitive to low dose systemic lidocaine. Pain behavior, in rats and children, is also sensitive to gabapentin.
We postulated that the mechanism of the anti-GD2-induced pain involved activation of the complement cascade resulting in a complement-dependent cytotoxicity (CDC). With this in mind we engineered a new form of the antibody (Hu14.18) with a point mutation within the C region that was intended to reduce complement fixation. In vitro experiments of the mutated antibody confirmed significantly diminished CDC, however, there was still a strong antibody-dependent cellular cytotoxicity (ADCC) involving natural killer cells. In rats, Hu14.18 results in a smaller magnitude of mechanical sensitization with a greatly shortened duration compared to ch14.18. Thus, ability to activate complement increases the antibody-elicited pain.
The two most likely complement factors to be involved in this process are C5a and membrane attack complex (MAC). Systemic pretreatment with a C5a receptor antagonist totally prevented ch14.18 elicited pain behavior. To look at the role of MAC, we utilized rats with deficient complement factor C6 as C6 is a necessary component of membrane attack complex. C6 deficient rats injected with ch14.18 showed greatly reduced tactile sensitivity. Injection of these animals with Hu14.18 resulted in pain behavior that was no different from animals injected with saline. We conclude that both C5a and MAC are necessary for full manifestation of the anti-GD2 induced pain behavior, although C5a appears to be playing a greater role. Reducing complement activity of immunotherapeutic agents may increase their utility by decreasing their side effects.
© 2010 Scandinavian Association for the Study of Pain
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