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Background The treatment of trigeminal neuralgia remains a challenging issue.
Stem cells from human exfoliated deciduous teeth (SHED) provide optimized therapy for chronic pain. This study aimed to investigate the mechanisms underlying the attenuation of trigeminal neuralgia by SHED.
Methods Trigeminal neuralgia was induced by chronic constriction injury of the infraorbital nerve. The mechanical threshold was assessed after model establishment and local SHED transplantation. Endoplasmic reticulum (ER) morphology and Caspase12 expression in trigeminal ganglion (TG) was evaluated as well. BiP expression was observed in PC12 cells induced by tunicamycin.
Results The local transplantation of SHED could relieve trigeminal neuralgia in rats.
Further, transmission electron microscopy revealed swelling of the ER in rats with trigeminal neuralgia. Moreover, SHED inhibited the tunicamycin-induced up-regulated expression of BiP mRNA and protein in vitro. Additionally, SHED decreased the up-regulated expression of Caspase12 mRNA and protein in the TG of rats caused by trigeminal neuralgia after chronic constriction injury of the infraorbital nerve mode.
Conclusions This findings demonstrated that SHED could alleviate pain by relieving ER stress which provide potential basic evidence for clinical pain treatment.
Fig. 1
Changes in the mechanical threshold. Compared with the sham group, the CCI-ION group showed a decreased mechanical threshold at 3, 6, 10, and 17 days after nerve ligation (**P < 0.001). Compared with the baseline level, the CCI-ION group showed a decreased mechanical threshold at 3, 6, 10, and 17 days after nerve ligation (##P < 0.001). Compared with the baseline level, the SHED group showed increased mechanical threshold at 6, 10, and 17 days after nerve ligation (#P < 0.001). Compared with the medium group, the SHED group showed an increased mechanical threshold at 6, 10, and 17 days after nerve ligation (*P < 0.001). Mechanical threshold data were analyzed using two-way repeated measures ANOVA followed by Bonferroni’s post hoc test. The significance level was determined at P < 0.05. The error bars indicate mean ± standard deviation. CCI-ION: chronic constriction injury of the infraorbital nerve, SHED: stem cells from human exfoliated deciduous teeth.
Fig. 2
Change of the shape of the endoplasmic reticulum after nerve ligation. (A) The arrow shows the normal form of the endoplasmic reticulum. (B) The star shows the abnormal form of the endoplasmic reticulum. Scale bar = 1 μm. N: nucleus.
Fig. 3
Relative mRNA and protein levels of BiP induced by TM after SHED treatment in PC12 cells. (A) The TM group compared with the control group (*P = 0.033). The SHED group compared with the TM group (#P = 0.013). (B) The TM group compared with the control group (*P = 0.012).The SHED group compared with the TM group (#P = 0.006). One-way ANOVA was used to compare data in the three groups. The significance level was determined at P < 0.05. The error bars indicate mean ± standard deviation. TM: tunicamycin, SHED: stem cells from human exfoliated deciduous teeth.
Fig. 4
Relative mRNA and protein levels of Caspase12 from CCI-ION rats after SHED transplantation. (A) The CCI-ION group compared with the sham group (*P = 0.006). The SHED group compared with the CCI-ION group (n = 6 rats in each group) (#P = 0.001). (B) The CCI-ION group compared with the sham group (*P = 0.005). The SHED group compared with the CCI-ION group (n = 6 rats each group) (#P = 0.009). One-way ANOVA was used to compare data in the three groups. The significance level was determined at P < 0.05. The error bars indicate mean ± standard deviation. CCI-ION: chronic constriction injury of the infraorbital nerve, SHED: stem cells from human exfoliated deciduous teeth.