Fig. 2
Acute hyperglycemia affects ensheathment by the perineurium. A: in control ins:NTR;Tg(nkx2.2a:megfp) fish 7 days postfertilization (dpf), the perineurium is present in regular intervals (asterisks) along the spinal cord. NTR, nitroreductase; megfp, monomeric enhanced green fluorescent protein. B: following the schedule of treatment described in Fig. 1A, nkx2.2a+ perineurial glia in ins:NTR;Tg(nkx2.2a:megfp) fish are stalled at the motor exit point along the spinal cord (white arrows) and are occasionally observed in ectopic locations (arrowhead). MTZ, metronidazole. Scale bar = 50 μm. C: percentage of nerves in which perineurial glia were present was higher in control than MTZ-treated fish. ****P < 0.0001. D: fewer nerves were properly ensheathed by the perineurium in MTZ-treated than control fish. ****P < 0.0001. E: perineurial segments along the peripheral nerve were shorter in MTZ-treated than control fish. ****P < 0.0001.