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2016 ; 28
(3
): 260-7
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New therapeutic and diagnostic opportunities for injured tissue-specific
targeting of complement inhibitors and imaging modalities
#MMPMID27282113
Holers VM
; Tomlinson S
; Kulik L
; Atkinson C
; Rohrer B
; Banda N
; Thurman JM
Semin Immunol
2016[Jun]; 28
(3
): 260-7
PMID27282113
show ga
Despite substantial opportunity and commercial interest in developing drugs that
modulate the complement system in a broad range of non-orphan indications,
several obstacles remain to be overcome. Among these issues is the biophysical
nature of complement proteins, whose circulating levels are typically very high
and whose turnover rates are relatively rapid, especially in the setting of
chronic inflammatory conditions. This situation necessitates the use of very high
levels of therapeutic compounds in order to achieve both multi-pathway and
multiple effector mechanism inhibition. In addition, one must avoid infectious
complications or the systemic impairment of the other important physiological
functions of complement. Herein we focus on the development of a novel
therapeutic strategy based on injured tissue-specific targeting of complement
inhibitors using the antigen-combining domains of a small subset of natural IgM
antibodies, which as endogenous antibodies specifically recognize sites of local
damage across a broad range of tissues and locally activate complement C3,
resulting in C3 fragment covalent fixation. Because the use of such recombinant
tissue-targeting inhibitors precludes the utility of measuring systemic levels of
complement biomarkers or function, since a goal of this targeting strategy is to
leave those processes intact and unimpeded, we also briefly describe a new method
designed to quantitatively measure using imaging modalities the inhibition of
generation of fixed C3 fragments at sites of inflammation/injury. In addition to
the ability to determine whether complement activation is locally constrained
with the use of inhibitors, there is also a broader application of this imaging
approach to inflammatory and autoimmune diseases characterized by local
complement activation.
|Animals
[MESH]
|Autoimmunity
[MESH]
|Complement Activation
[MESH]
|Complement Inactivating Agents/*therapeutic use
[MESH]