Systematic Review of 12 Preclinical Studies A meta-analysis published in Molecular Biology Reports examined 12 animal studies evaluating MSC treatment for hearing loss: MSC treatment resulted in a mean improvement of 15.22 dB in auditory brainstem response (ABR) thresholds Distortion product otoacoustic emissions (DPOAE) improved by a mean of +9.10 dB MSCs were derived from multiple tissue sources including bone marrow, adipose tissue, and umbilical cord blood Doses ranged from 4 10 to 1 10 cells Umbilical Cord Blood MSC Study (Guinea Pigs) Research published in Biochemical and Biophysical Research Communications demonstrated dramatic hearing restoration in deaf animals: Deaf animals receiving intravenous human umbilical cord blood MSCs showed significant hearing restoration Hearing thresholds improved from 80-90 dB (profound deafness) to 40 dBa 40-50 dB improvement Histological examination showed increased numbers of spiral ganglion cells and outer hair cells Untreated deaf animals showed no recovery and remained at 80-90 dB thresholds Cisplatin-Induced Hearing Loss Study (Mice) Research published in Hearing Research found that intravenous skin-derived MSCs provided significant protection: MSC treatment significantly reduced hearing thresholds in cisplatin-treated mice Cochlear hair cells were significantly preserved Reduced apoptosis (cell death) in cochlear tissues as measured by TUNEL and caspase-3 staining Gene analysis showed MSCs downregulated genes involved in apoptosis, oxidative stress, and tissue damage MSCs upregulated genes affecting neural connectivity, growth factor signaling, and neurotransmitter function Noise-Induced Hearing Loss Study (Mice) Research published in Frontiers in Cellular Neuroscience examined MSCs derived from human umbilical cord Whartons jelly: MSCs were injected into the perilymph after severe sound trauma Treatment induced a moderate hearing protective effect MSC treatment resulted in upregulation of genes related to immune modulation, hypoxia response, mitochondrial function, and regulation of apoptosis Downregulation occurred in genes related to synaptic remodeling, calcium homeostasis, and extracellular matrix changes Cord Tissue vs
GLT-1: The elusive presynaptic glutamate transporter
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