Tiny Robots Deliver Cancer Drugs Better with Hydrogen Therapy Benefits
- Authors
- Qingtao Song, Yilin Liu, Xiaoyong Ding, Miao Feng, Jing Li, Wenjuan Liu, Bohan Wang, Zhongwei Gu
- Journal
- Nanoscale
- Year
- 2023
- DOI
- 10.1039/d3nr01548c
- Study Type
- Cell Culture
- Outcome
- Positive
- Peer Reviewed
- Yes
- Country
- China
- Health Condition
- Hepatocellular Carcinoma
- Body System
- Hepatic
TL;DR
Scientists have created tiny self-powered "micromotors" that carry cancer drugs directly into liver cancer cells, making the treatment more effective.
Key Finding
Magnesium-based micromotors delivered chemotherapy drugs 2.9 times more effectively to liver cancer cells compared to passive delivery systems, while also producing hydrogen gas that reduced cellular damage.
Summary
Researchers designed tiny moving particles made of magnesium coated with polymers to deliver cancer drugs directly to liver cancer cells. These micromotors (particles small enough to move on their own) carried two different chemotherapy drugs and moved through cells at high speed, delivering about 3 times more drug than traditional methods. As a bonus, the magnesium produced hydrogen gas, which reduced harmful molecules called reactive oxygen species in the cancer cells.
Practical Takeaway
This is early laboratory research in cancer cells only—not tested in animals or humans yet. While the hydrogen byproduct is interesting, the study's main focus is on the drug delivery system itself, not hydrogen water as a standalone treatment. The results suggest active drug delivery platforms may help overcome drug resistance in liver cancer, but much more research is needed before any clinical application.
Abstract
Combination therapy is an emerging strategy to overcome multidrug resistance (MDR) in hepatocellular carcinoma (HCC) chemotherapy treatment. However, the passive diffusion in traditional delivery systems greatly retards the approach and penetration of drugs into hepatocellular carcinoma cells and thus hinders the efficacy of combination therapy. Micro/nanomotors with autonomous locomotion in a tiny scale provide the possibility of tackling this issue. Herein, an active drug delivery micromotor platform delicately designed to load drugs with different physicochemical properties and enhance the drug permeability of cells is demonstrated for HCC chemotherapy treatment. The biocompatible micromotor platform Mg/PLGA/CHI comprised magnesium (Mg) coated with two polymer layers made of poly(lactic-co-glycolic acid) (PLGA) and chitosan (CHI), where the hydrophobic and hydrophilic drugs doxorubicin (Dox) and Curcumin (Cur) were loaded, respectively. The autonomous motion of the micromotors with velocity up to 45 μm s-1 greatly enhanced the diffusion of chemotherapeutic drugs and led to higher extracellular and intracellular drug distribution. Moreover, hydrogen produced during the motion eliminated the excess reactive oxygen species (ROS) in the human hepatocellular carcinoma (HepG2) cells. Compared with inert groups, the absorption of Dox and Cur from the active micromotors was about 2.9 and 1.5 times higher in human hepatocellular carcinoma (HepG2) cells. In addition, the anti-tumor activity also obviously improved at the micromotor concentration of 1 mg mL-1 (cell proliferation was reduced by almost 30%). Overall, this work proposes an approach based on loading different chemotherapy agents on an active delivery system to enhance drug permeability and overcome MDR and provides a potentially effective therapeutic strategy for the treatment of HCC.