CDNF

Class

neurotrophic factor (recombinant protein)

CDNF (cerebral dopamine neurotrophic factor) is a small secreted protein that belongs to a distinct family of neurotrophic factors, alongside MANF, that differs structurally and mechanistically from classical neurotrophic factors such as the NGF or GDNF families. Rather than acting primarily through cell-surface receptor tyrosine kinases, CDNF is thought to work partly inside cells, where it helps regulate the endoplasmic reticulum's response to misfolded or accumulating proteins, a process called the unfolded protein response. It also appears to support neuron survival and dampen inflammatory activity in supporting glial cells from outside the cell. The biological rationale for developing CDNF as a therapeutic rests on the observation that dopamine-producing neurons in the brain are vulnerable to protein-handling stress and progressive degeneration, a hallmark of Parkinson's disease. By reducing cellular stress and supporting neuron survival through a mechanism distinct from dopamine replacement, CDNF-based therapies aim to address the underlying degenerative process rather than only its symptoms. Because CDNF is a protein rather than a small molecule, delivering it to the brain in adequate amounts is a central challenge, which has motivated engineered variants designed to improve tissue distribution or ease of administration. This mechanism is of broad interest wherever neuronal loss driven by cellular stress and protein misfolding is implicated, most notably in Parkinson's disease.