Perturbing the mitochondrial pores using inhibitors of bax and bid along with cyclosporine-A could prevent cell death due to secondary injury after contusion spinal cord injury.

Delayed cell death following contusion spinal cord injury (SCI) is mediated through multiple, overlapping apoptotic pathways, including intrinsic, extrinsic, and granzyme-mediated cascades. Mitochondrial permeability transition pore (mPTP) opening plays a central role in the intrinsic pathway by compromising mitochondrial membrane integrity and enabling the release of cytochrome C and apoptosis-inducing factor (AIF), which activate caspase-dependent and -independent mechanisms. In this study, a holistic approach to preventing the intrinsic pathway of apoptosis was undertaken by inhibiting mPTP gating through targeting the responsible proteins, namely, both BAX and BID, key pro-apoptotic Bcl-2 family proteins, along with cyclosporine A, a known inhibitor of the VDAC-ANT-Cyp-D pore complex. In a rodent model of thoracic contusion SCI, intraparenchymal administration of these inhibitors was followed by Western blot analysis of pathway-specific apoptotic markers at 3 and 7 days post-injury. The results demonstrated effective attenuation of intrinsic apoptosis, accompanied by a collateral reduction in extrinsic and granzyme-mediated pathways. Importantly, this inhibition of apoptosis did not exacerbate necrotic progression, indicating a selective and beneficial modulation of secondary cell death mechanisms. These findings provide initial evidence supporting mitochondrial pore-targeted strategies as a promising therapeutic avenue to mitigate apoptosis-driven secondary damage following SCI. Interestingly, it appears targeting just one pathway of apoptosis itself can produce more beneficial effects by collateral inhibition of other pathways as well. Further studies would be required to validate whether the molecular level benefits observed transulate into systemic improvement in functional recovery after contusion SCI.