But do we really know for sure that the 'bomb blast' pill by HEI is also repeating/creating synapses? I have listened to the Tinnitus Talk Podcast, where they talked about it:
"Then, subsequently we found out that it might have some restorative capabilities and may have some efficacy for tinnitus. At least as we've seen in pre-clinical rodent models. It seems to regenerate the afferent nerve endings and synapses at the base of the inner hair cell, quite interestingly"
"Yes, so this doesn't regenerate hair cells, but it regenerates a nerve ending. The injection technology regenerates hair cells. But with regard to the window there for the pill, we know it's effective if given shortly after the injury in animal models for sure. But we've done some delayed studies where it was administered four weeks later and there was regeneration of the nerve endings and reduction of tinnitus percept. So, it may work in chronic situations and we are submitting a grant to that effect right now to look more intently and intensely to see if they can reverse chronic tinnitus. But our pilot data suggests that it may."
"I think the pre-clinical data for tinnitus are pretty strong and reproduceable and we have had an outside lab reproduce some of our data. So, I think the pre-clinical data for tinnitus are pretty strong. In addition to decreasing tinnitus percept, we see a number of file markers that are normalised that were previously abnormal from the noise exposure that are associated with tinnitus both in the cochlear and the brain stem and the auditory cortex so we see a correlation between re-grown nerve endings and normalisation of Wave 5 - Wave 1 ratio in the ABR Tracings and normalisation of these file markers that are thrown off that are associated with tinnitus. So, really the data are quite robust. All that being said, it's a big jump from small animals to humans. I think that the pre-clinical data are very strong for tinnitus. Hyperacusis, we haven't really looked at that too much. In theory I think it should be helpful, but we really haven't explored that to any degree at this point but would be willing to do so as we have funding and bandwidth."
But for me it seems for now more like speculation whether it actually does regenerate synapses even for chronic tinnitus. The second problem is, that there is up to now not much progress going on. If one looks in the
Hough Ear Institute's Hair Cell Regeneration Project thread, one can see, that so far nothing more than safety trials have been performed. The to be expected doses of HPN-07 mentioned in their patents are all over the place - ranging from 1,5 g per day in the safety trial up to 20 g per day IV...