05; Fig. 3a). Table 1 Paranode and incisure measurements The spatiotemporal localization of JAM-C immunoreactive incisures JAM-C immunoreactive incisures were examined in a similar spatiotemporal manner as JAM-C immunoreactive paranodes. At three (not illustrated) and 14 days (Fig. 2a, c, e, and g) after injury, JAM-C immunoreactive incisures decreased significantly in the distal nerve and remained below control levels (Fig. 3b). Fourteen days postcrush, incisural shapes had become much narrower (Table 1), and the interincisural distance appeared #learn more keyword# to have decreased (Fig. 2c). Similar to our findings with paranodes, the complete disappearance of JAM-C

immunoreactive incisures was apparent in the middle and far-most distal regions at three and 14 days (Figs. 2e, g, ​,3b).3b). Analogous to the paranodes, a spatial pattern of localization after injury along the length of the distal Inhibitors,research,lifescience,medical nerve

was observed for the incisures, with the greatest loss of JAM-C appearing in the more distal regions. However, in contrast to the paranodes, at 14 days there was a significant increase in the number of incisures in the proximal nerve in comparison to controls (1245 ± 105 vs. 1012 ± 34 incisures/mm2; P < 0.05; Fig. 3b). JAM-C immunoreactive incisures appeared to show numerical recovery by 28 days (Fig. 3b) after injury, similar to the findings of JAM-C Inhibitors,research,lifescience,medical localization in paranodes. The shapes of incisures remained Inhibitors,research,lifescience,medical narrow, but their length had also decreased (Table 1). This may correspond to “partial” Schmidt–Lantermann incisures (i.e., incisures that do not cross through the entire thickness of the sheath). In the nerve just distal (1.4 mm) to the crush site, the density of JAM-C immunoreactive incisures was similar

to controls (1047 ± 93 incisures/mm2 Inhibitors,research,lifescience,medical vs. 986 ± 30 incisures/mm2; Fig. 3b). However, in the mid- and far-distal regions, there was still a significant decrease (16% and 40%, respectively, compared to the controls; P < 0.05). Fifty-six days following nerve injury (Fig. 2d, f, and h), the incisures remained small (Table 1), similar to those observed at 28 days. Quantitative Thymidine kinase analysis showed the density of JAM-C immunoreactive incisures was higher at just-distal site (1.4 mm) compared to controls, but decreased along the length of the nerve from the crush site to reach normal levels in the far-distal regions, with 1417 ± 93 JAM-C immunoreactive incisures/mm2 in the near-distal region compared to 1114 ± 65 JAM-C immunoreactive incisures/mm2 in the far-distal region (P < 0.05; Fig. 3b). This pattern of localization spatially is the opposite to that observed with the JAM-C immunoreactive paranodes. Summarizing all results of crush lesions at various time points, the densities of JAM-C immunoreactive paranodes and incisures decreased three days following nerve crush injury, and then notably underwent a subsequent increase over time.