Key result
On a CNTF null background, LIF knockout was associated with increased EAE severity (EAE grade 2.6 vs 2.1; P < 0.05) and increased axonal damage relative to LIF heterozygous mice.
Absolute Event Rate: 2.6% vs 2.1%
p-value: p=<0.05
Endogenous CNTF and LIF act centrally to protect axons from acute inflammatory destruction in EAE via an oligodendrocyte-independent mechanism.
Suggests LIF compensates for CNTF loss in axonal protection during EAE; extends mechanistic insights but leaves open translation to human disease.
Leukemia inhibitory factor (LIF) and Ciliary Neurotrophic factor (CNTF) are members of the interleukin-6 family of cytokines, defined by use of the gp130 molecule as an obligate receptor. In the murine experimental autoimmune encephalomyelitis (EAE) model, antagonism of LIF and genetic deletion of CNTF worsen disease. The potential mechanism of action of these cytokines in EAE is complex, as gp130 is expressed by all neural cells, and could involve immuno-modulation, reduction of oligodendrocyte injury, neuronal protection, or a combination of these actions. In this study we aim to investigate whether the beneficial effects of CNTF/LIF signalling in EAE are associated with axonal protection; and whether this requires signalling through oligodendrocytes. We induced MOG₃₅₋₅₅ EAE in CNTF, LIF and double knockout mice. On a CNTF null background, LIF knockout was associated with increased EAE severity (EAE grade 2.1±0.14 vs 2.6±0.19; P<0.05). These mice also showed increased axonal damage relative to LIF heterozygous mice, as indicated by decreased optic nerve parallel diffusivity on MRI (1540±207 µm²-/s vs 1310±175 µm²-/s; P<0.05), and optic nerve (-12.5%) and spinal cord (-16%) axon densities; and increased serum neurofilament-H levels (2.5 fold increase). No differences in inflammatory cell numbers or peripheral auto-immune T-cell priming were evident. Oligodendrocyte-targeted gp130 knockout mice showed that disruption of CNTF/LIF signalling in these cells has no effect on acute EAE severity. These studies demonstrate that endogenous CNTF and LIF act centrally to protect axons from acute inflammatory destruction via an oligodendrocyte-independent mechanism.
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Gresle et al. (2012) studied Experimental Autoimmune Encephalomyelitis (EAE) (n=244). LIF knockout (on CNTF null background) vs. LIF heterozygous (on CNTF null background) was evaluated on EAE severity grade (p=<0.05). On a CNTF null background, LIF knockout was associated with increased EAE severity (EAE grade 2.6 vs 2.1; P < 0.05) and increased axonal damage relative to LIF heterozygous mice.
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