NG2 cells can form synapses with neurons. What are the functions of such connection?
Following may help.
Polydendrocytes: NG2 Cells with Many Roles in Development and Repair of the CNS
Nishiyama Neuroscientist.2007; 13: 62-76
NG2 cells response to axonal alteration in the spinal cord white matter in mice with genetic disruption of neurofilament light subunit expression.
Wu YJ, Tang YF, Xiao ZC, Bao ZM, He BP
Mol Neurodegener 2008 Oct 28, 3:18
NG2 Glial Cells Provide a Favorable Substrate for Growing Axons. The Journal of Neuroscience, April 5, 2006, 26(14):3829-3839; doi:10.1523/JNEUROSCI.4247-05.2006