11 kinesiska forskare har studerat människans nervbanor och de idag förekommande försök att reparera och återskapa skadade nervbanor. Utan att veta med 100% säkerhet förmodar jag att studien handlar om signalsystemet mellan hjärna och ryggrad. Ex en skada som uppkommit antingen i hjärnan eller ryggraden och hur dessa 2 kroppsdelar kan fås att återkopplas igen. Tänk benförlamning. Studien är tyvärr inlåst så vi får hålla tillgodo med abstractet tills vidare.
Mechanical Stretch Promotes Neurite Outgrowth of Primary Cultured Dorsal Root Ganglion Neurons via Suppression of Semaphorin 3A-Neuropilin-1/Plexin-A1 Signaling
Publication Date:November 22, 2022
Abstract
Significant attempts have been made to promote neuronal extension and migration in nerve development and regeneration. Although mechanical stretch induces persistent elongation of the axon, the underlying molecular mechanisms are not yet clear. Some axonal guidance cues secreted in the growth cone that affect the axonal growth could attract or repel axons in neurite connection. As semaphorin 3A (Sema3A) is an important repulsion guidance molecule, inhibition of Sema3A has been postulated to promote neuronal development. In this study, the effects of mechanical stretch on dorsal root ganglion neuronal growth and the underlying mechanisms were investigated by assessing the extension direction, neurite length, cell body size, mitochondrial membrane potential, and the expression of Sema3A and its receptors. Our results showed that cell viability significantly increased at tensile strains of 2.5, 5, and 10% for 4 h, with the most prominent effect at 5% tensile strain. Moreover, neurons migrated closer to the stretching direction at 5% tensile strain (0–12 h), while the neurons of the control group moved in a disorderly manner. Furthermore, Sema3A-Neuropilin-1/Plexin-A1 signaling pathway was found to be suppressed after mechanical stretch at 5% tensile strain for 4 h by immunofluorescence staining, immunoprecipitation, and western blot assay. Finally, a Sema3A-SiRNA (SiRNA = small interfering RNA) treatment led to remarkable guidance growth in the stretch-grown neurons. Importantly, there was significant decrease of repulsive cue Sema3A expression and remarkable increase of attractive molecule Netrin-1 expression after mechanical stretching treatment, which jointly promoted neurite outgrowth. This study provides a promising new approach for the development of mechanical stretching therapy or guidance factor-related drugs in injured neuronal regeneration.
För verifikation vid användande av HoloMonitor i denna studie får Mr Google voucha för det. Eftersom jag inte hittar att studien skulle haft koppling till liknande studier och då refererats med dåvarande HoloMonitoranvändande får det anses ganska säkert att Mr Google är att lita på denna gång. För säkerhets skull har undertecknad letat upp 2 Googleverifikationer.
Mvh the99
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