Lollapalooza, Coachella, EDC, and many more music festivals have become a more and more popular scene for people of all ages and demographics to have a fun time and listen to music in astonishing environments. I know, as I work at concert halls and music festivals in Chicago, like Lollapalooza, Summersmash, Beyond Wonderland, Aragon Ballroom, and more. With concerts blasting music up to 130 decibels, and as I stand in front of the stage right where the speakers are located, I ask myself: Are my ears about to fall off? Or, raise actual concerns like: In the future, am I gonna be able to hear my kids? As a result, acoustic trauma is one of the many leading causes of Sensorineural Hearing Loss (SNHL). I believe that it is important for people to be aware of how crucial our sense of hearing is, so it is imperative we protect and educate ourselves. Of course, there are many other reasons, such as aging, ototoxic drugs(drugs that damage the inner ear), head trauma, and infections. Nonetheless, they aren’t mutually exclusive, and SNHL is becoming more and more prevalent due to the increasing elderly population, the increasing use of ototoxic drugs, and music festivals gaining traction among diverse audiences.
I had the fortune to listen to a seminar where Dr. Wei-Ming Yu spoke about the research he was a part of. In the experiments, it focuses on mutations in the type II transmembrane serine protease(TMPRSS), which is associated with hearing loss. Hepsin, also known as TMPRSS1, a part of the TMPRSS family, is a protein found in the liver that also has a significant influence on the auditory system in humans. Using mice, they discovered that Hepsin-Knockout mice showed profound hearing loss due to the disintegrating structure of the tectorial membrane, a protein-based membrane that is essential for hearing. This type of problem arising in humans would have to be genetically screened early on after birth. But introducing wild-type human hepsin into the inner ear of hepsin knockout mice partially restored both auditory function and the structural integrity of the tectorial membrane. This makes one wonder about the potential clinical applications, if more mechanisms are properly identified, that can help our demographic of those with hearing problems or those who are at risk of hearing problems.
After attending to Dr. Wei-Ming Yu’s research and hearing that calcium channels are highly involved in the auditory system, it reminded me of my neuroscience 101 class where I first learned about calcium channels in the synapse. Thanks to my NEUR 101 class, it prompted me to look online for any information about hearing loss as a result of hypo/hypercalcemia or any other consequence disrupting the flow of calcium. That led me to this next research journal, The Role of Calcium Signaling in Sensorineural Hearing Loss. It claims that SNHL is growing, with approximately 104 million people affected in China by mild or more severe hearing impairments. According to the journal, calcium has a lot of roles, such as maintaining a homeostatic environment for the inner ear, transducing signals from vibrations into sounds that the brain can process, and much more. Clearly, we can understand the value of calcium regarding the auditory system. The researchers discovered that a large influx of calcium is induced into the inner ear cells due to the large amounts of acoustic energy. Then, the overload of calcium causes a mitochondrial ion channel to pull the calcium to mitigate the damage, but that eventually leads to mitochondrial depolarization and cell death because of apoptosis. And because mammalian cells in the inner ear don’t come back, this damage is permanent. While prevention for loud environments can be achieved via ear protection, genetic hearing problems can benefit a lot more from therapeutics that this article suggests: Calcium channel blockers are one way to mitigate the damage to mammalian cells in the inner ear. Some calcium channel blockers have the potential to even reduce hearing loss. However, that cited study had many limitations due to timing and other unknown mechanisms.
All in all, that type of information is very promising for potential future breakthroughs that can improve the quality of life of hundreds of millions of people on this planet. Especially because of the importance of the auditory system. I am hopeful that research like this continues to learn more about the auditory system. I also hope that the future can implement preventative measures for people like me as well!
Works Cited
Ting-Hua Yang, Yu-Chen Hsu, Peng Yeh, Chia-Jui Hung, Yu-Fei Tsai, Mo-Chu Fang, Alice Chih Chia Yen, Li-Fu Chen, Jhih-Yu Pan, Chen-Chi Wu, Tien-Chen Liu, Fong-Ling Chung, Wei-Ming Yu, Shu-Wha Lin, Critical role of hepsin/TMPRSS1 in hearing and tectorial membrane morphogenesis: Insights from transgenic mouse models, Hearing Research,
Volume 453, 2024, 109134, ISSN 0378-5955, https://doi.org/10.1016/j.heares.2024.109134.
Hu Y, Li J, Tian L, Zhang P, Zeng X. The Role of Calcium Signaling in Sensorineural Hearing Loss. Int J Med Sci. 2025 Sep 21;22(15):4063-4076. doi: 10.7150/ijms.119492. PMID: 41049429; PMCID: PMC12492363.
No comments:
Post a Comment