Antibody Treatment Shows Promise in Reversing Endogenous Retrovirus Damage in Multiple Sclerosis Models
Researchers demonstrated that a neutralizing antibody targeting the HERV-W envelope protein accelerated myelin repair and reduced neurodegeneration in a transgenic mouse model of demyelination. HERV-W, a human endogenous retrovirus, has been implicated in driving disease progression in multiple sclerosis independent of relapse activity, and early clinical trials with the antibody Temelimab had suggested therapeutic potential. The findings provide direct preclinical evidence that such antibodies can penetrate the central nervous system and counter the neurotoxic effects of this viral protein, potentially addressing a mechanism underlying smouldering MS progression.
A new preprint study on bioRxiv reports that a neutralizing antibody directed against the envelope (ENV) protein of human endogenous retrovirus type W (HERV-W) can meaningfully reduce neurological damage and promote myelin repair in transgenic mice engineered to express the human HERV-W ENV protein. In the non-inflammatory demyelination model used, repeated intraperitoneal injections of the anti-ENV antibody led to accelerated differentiation of oligodendrocytes — the cells responsible for producing myelin — along with enhanced remyelination and measurable axonal protection. Serum levels of neurofilament light chain, a biomarker of neuronal damage, were also reduced following treatment. At the cellular level, microglia and astrocytes, which had been polarized toward neurotoxic states by HERV-W ENV expression, shifted toward more homeostatic and regenerative phenotypes after antibody treatment. These results build on earlier clinical trial data for Temelimab, a therapeutic antibody with the same target, and strengthen the hypothesis that HERV-W ENV contributes to progression independent of relapse activity (PIRA) in MS — a form of worsening that current anti-inflammatory therapies do not adequately address.
What's missing
The study uses a non-inflammatory demyelination mouse model, which may not fully recapitulate the complex immune environment of human MS; translation to patients remains unproven. The transgenic mice express HERV-W ENV constitutively, whereas in MS patients ENV expression is variable and context-dependent. Long-term safety and dosing data for the antibody approach in this model are not reported, and the mechanistic pathway by which the antibody crosses the blood-brain barrier is not fully characterized.
What different sources said
- bioRxivCenter
Antibody-mediated rescue of endogenous retrovirus-induced damage in the demyelinated central nervous system
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