A wearable patch developed by researchers at King Abdullah University of Science & Technology (KAUST) tracks levels of potent antibiotics such as vancomycin in the body in real time using microneedles coated in DNA molecules. According to doctoral student Yurii Tsyban, the platform aims to improve precision drug monitoring by continuously measuring concentrations in the dermal interstitial fluid just beneath the skin rather than relying on occasional laboratory blood draws.
How DNA-Coated Microneedles Track Antibiotics in Real Time
The wearable patch utilizes a tiny array of microneedles that lightly puncture the outer layers of the skin. These needles are coated with DNA aptamers, which are short strands of DNA designed to selectively recognize and bind specific target molecules like vancomycin, according to KAUST researchers. When the antibiotic is present in the interstitial fluid, the aptamer changes its shape.
This conformational change creates an electrochemical signal that allows for continuous quantification of the drug’s concentration. Tsyban explains that a miniature mobile potentiostat (MSTAT) designed by the team measures this electrical signal, processes the incoming data, converts it into an estimated drug concentration, and wirelessly transmits the results to a smartphone application.
Did you know? Dermal interstitial fluid surrounds cells in the dermis and contains nutrients and metabolites whose drug concentrations closely reflect those found in the bloodstream.
Overcoming the Limits of Traditional Blood Draws
Traditional therapeutic drug monitoring relies on drawing blood and waiting several hours for laboratory results. According to Yurii Tsyban, this long-established method only offers doctors a snapshot of a highly dynamic system. Every individual’s body reacts to and metabolizes drugs differently, making periodic snapshots less effective for medications with a narrow therapeutic window.
When a drug has a narrow therapeutic window, small changes in concentration can lead to significant clinical consequences. A dose that remains safe and effective for one patient can easily prove toxic or ineffective for another. By shifting from periodic blood tests to continuous monitoring, medical providers could theoretically optimize drug dosing and improve treatment safety across hospital, outpatient, and home settings.
Initial animal studies conducted by the KAUST team in mice demonstrated that the device successfully tracked repeated dosing events over a four-hour window. Furthermore, separate laboratory tests utilizing artificial interstitial fluid showed that the sensing system remained stable for up to 10 hours.
Khaled Nabil Salama, who supervised the project, notes that the device revealed clear differences in vancomycin levels from one animal to another. This level of variability highlights the exact information that gets missed when dosing decisions depend solely on occasional blood tests. However, before the patch can see regular clinical use, Salama points out that important work remains, including improving long-term stability and completing required biocompatibility studies.
Pro Tip: While conventional hypodermic needles can cause anxiety, microneedles penetrate only the outermost layers of the skin, making them comfortable to wear during continuous health monitoring.
Frequently Asked Questions
What is dermal interstitial fluid?
It is the liquid found in the microscopic spaces between cells in the dermis layer beneath the skin’s surface. Its concentrations of many drugs closely reflect those found in the bloodstream.
How does the wearable patch transmit data?
A miniature mobile potentiostat (MSTAT) processes the electrical signals generated by the DNA aptamers, converts them into an estimated drug concentration, and wirelessly sends the results to a smartphone app.
Is the microneedle patch painful to wear?
According to researchers, the tiny microneedles penetrate only the outer layers of the skin, offering a comfortable alternative to conventional hypodermic needles and repeated blood draws.
Want to stay updated on the latest medical technology breakthroughs? Subscribe to our newsletter or explore more health tech articles on our site today.
Keep reading