The present invention relates in general to an inhibitor of a glutaminyl peptide cyclotransferase-like protein (QPCTL), and the use thereof for the treatment and / or prevention of an inflammatory disease or disorder selected from the group consisting of (a) chronic and acute inflammations, e.g. rheumatoid arthritis, atherosclerosis, restenosis, pancreatitis; (b) other inflammatory diseases, e.g. neuropathic pain, graft rejection / graft failure / graft vasculopathy, HIV infections / AIDS, gestosis, tuberous sclerosis, Guillain-Barré syndrome, chronic inflammatory demyelinizing polyradiculoneuropathy and multiple sclerosis; (c) neuroinflammation; and (d) neurodegenerative diseases, e.g. mild cognitive impairment (MCI), Alzheimer's disease, neurodegeneration in Down Syndrome, Familial British Dementia, and Familial Danish Dementia, which may result from neuroinflammation.