CCL2 and amyotrophic lateral sclerosis: An induction of neuronal CCL2 expression was described in response to various types of injury and degeneration such as ischemia, Alzheimer’s disease, MS, axonal injury, amyotrophic lateral sclerosis (ALS) or peripheral nerve injury (Barna et al., 1994; Che et al., 2001; Pang et al., 2001; Rancan et al., 2001; Schreiber et al., 2001; Baron et al., 2005; Bose and Cho, 2013; Perner et al., 2018).