Abstract (eng)
Acute slices are an important model for research on neuronal circuits. The model is well suited for movement-sensitive electrophysiological recording techniques and pharmacological drug application. However, neuronal tissue can suffer from ischemic injury during slice production. Reports claim that slices from older animals were more prone to ischemic injury resulting in low viability. One of the most effective methods to protect their viability is the modification of the artificial cerebrospinal fluid (aCSF) that is used for cutting and subsequent incubation. A NMDG-HEPES aCSF enriched with antioxidants was proposed to reduce cell swelling, acidification and oxidative stress in the tissue. While already successfully used for preparing healthy brain slices, the beneficial effect of protective cutting protocols for spinal cord slices – if any – is still unclear. In this study, I aimed at testing the effectiveness of a NMDG-HEPES aCSF for preservation of spinal cord slices of adolescent male rats.
Here, a comparison of overall viability of spinal cord slices prepared from young (20–25 days) or adolescent male rats (35–40 days) revealed no differences. Likewise, the electrophysiological properties of neurons in lamina I were similar between the groups. The use of NMDG-HEPES aCSF for slice preparation did not have any beneficial effects on overall health when compared to a modified sucrose aCSF. In contrast, slices showed significantly lower viability, which could be restored by reducing the time of incubation in NMDG-HEPES aCSF. Taken together, NMDG-HEPES aCSF was no more suitable to preserve spinal cord slice viability than traditional sucrose aCSF under our experimental conditions.