Can hydrogen therapy prevent drug-induced hearing loss?

Yes, this study shows that hydrogen delivered via special nanoparticles can effectively prevent hearing loss caused by certain medications. The hydrogen acts as an antioxidant to protect inner ear hair cells from damage.

What medications can cause hearing loss?

Aminoglycoside antibiotics and chemotherapy drugs like cisplatin are known to cause hearing damage. These medications can destroy hair cells in the inner ear, leading to permanent hearing loss.

How do hydrogen nanoparticles protect the inner ear?

The nanoparticles deliver hydrogen directly to the inner ear where it neutralizes harmful free radicals and reduces inflammation. They're designed to release their protective contents only when damage is occurring.

Is hydrogen therapy safe for hearing loss prevention?

The study showed high biocompatibility with no adverse effects even after long-term use. Hydrogen is naturally produced in the body and is considered very safe.

Could this treatment help cancer patients avoid hearing loss?

Potentially yes, since many cancer patients experience hearing loss from chemotherapy drugs like cisplatin. This research offers hope for protecting hearing during cancer treatment.

Hydrogen Nanoparticles Protect Against Drug-Induced Hearing Loss

Authors: Wenbin Xiao, Kerui He, Chong Yu, Zeming Zhou, Liye Xia, Shibao Xie, Hanqi Li, Ming Zhang, Zhifeng Zhang, Pei Luo, Wen Lu, Gang Chen
Journal: Molecular Pharmaceutics
Year: 2023
DOI: 10.1021/acs.molpharmaceut.3c00177
Study Type: Cell Culture
Outcome: Positive
Peer Reviewed: Yes
Country: China
Health Condition: Sensorineural Hearing Loss
Body System: Auditory

TL;DR

Scientists have developed tiny, smart particles that can deliver a combination of drugs directly to the inner ear to prevent drug-induced hearing loss.

Key Finding

Composite nanoparticles loaded with natural compounds and hydrogen nearly completely preserved inner ear hair cells and maintained normal hearing thresholds in guinea pigs treated with ototoxic drugs, suggesting a potential protective mechanism against drug-induced hearing loss.

Summary

Researchers created tiny composite particles designed to deliver multiple therapeutic compounds—including natural plant extracts and hydrogen—directly into the inner ear to protect against hearing loss caused by certain antibiotics and chemotherapy drugs. In guinea pig studies, these nanoparticles successfully preserved inner ear hair cells (which are essential for hearing) and prevented hearing damage by reducing harmful molecules called reactive oxygen species and decreasing inflammation.

Practical Takeaway

While this research is promising, it remains in early-stage animal testing and has not been tested in humans. The study demonstrates that hydrogen combined with other compounds may help protect hearing in a laboratory setting, but much more research is needed before any conclusions can be drawn about effectiveness or safety in people taking hearing-damaging medications.

Abstract

Ototoxic drugs such as aminoglycoside antibiotics and cisplatin (CDDP) can cause sensorineural hearing loss (SNHL), which is closely related to oxidative stress and the acidification of the inner ear microenvironment. Effective treatment of SNHL often requires multifaceted approach due to the complex pathology, and drug combination therapy is expected to be at the forefront of modern hearing loss treatment. Here, space-station-like composite nanoparticles (CCC@mPP NPs) with pH/oxidation dual responsiveness and multidrug simultaneous delivery capability were constructed and then loaded with various drugs including panax notoginseng saponins (PNS), tanshinone IIA (TSIIA), and ammonia borane (AB) to provide robust protection against SNHL. Molecular dynamics simulation revealed that carboxymethyl chitosan/calcium carbonate-chitosan (CCC) NPs and monomethoxy poly(ethylene glycol)-PLGA (mPP) NPs can rendezvous and dock primarily by hydrogen bonding, and electrostatic forces may be involved. Moreover, CCC@mPP NPs crossed the round window membrane (RWM) and entered the inner ear through endocytosis and paracellular pathway. The docking state was basically maintained during this process, which created favorable conditions for multidrug delivery. This nanosystem was highly sensitive to pH and reactive oxygen species (ROS) changes, as evidenced by the restricted release of payload at alkaline condition (pH 7.4) without ROS, while significantly promoting the release in acidic condition (pH 5.0 and 6.0) with ROS. TSIIA/PNS/AB-loaded CCC@mPP NPs almost completely preserved the hair cells and remained the hearing threshold shift within normal limits in aminoglycoside- or CDDP-treated guinea pigs. Further experiments demonstrated that the protective mechanisms of TSIIA/PNS/AB-loaded CCC@mPP NPs involved direct and indirect scavenging of excessive ROS, and reduced release of pro-inflammatory cytokines. Both in vitro and in vivo experiments showed the high biocompatibility of the composite NPs, even after long-term administration. Collectively, this work suggests that composite NPs is an ideal multi-drug-delivery vehicle and open new avenues for inner ear disease therapies.