With backing from the National Institutes of Health, Hai-Quan Mao and his collaborators are addressing health challenges on a scale ranging from that of individual patients to entire populations, working on topics including cancer treatment, protection against malaria, and nerve and tissue regeneration.
A professor in the Whiting School’s Department of Materials Science and Engineering and director of the Johns Hopkins Institute for NanoBioTechnology (INBT), Mao is also a key member of the NIH-funded Johns Hopkins Center for Translational Immunoengineering.
“With the support of the NIH, our team collaborates closely with clinicians and physician-scientists to design patient-centric solutions that address urgent medical challenges. By harnessing the power of materials science, we are developing innovative biomaterials—such as nanoparticles, hydrogels, and composite systems—that can enhance healing, improve immune therapies, and ultimately transform patient care,” Mao said.
RNA medicine shows promise for training the body to recognize tumors and eliminate them, but a better delivery system is needed to activate the immune cells within the body and generate an anti-tumor response. Mao is currently teaming up with Jordan Green, Jonathan Schneck, and Lei Zheng from the School of Medicine in an NIH-supported effort to address this challenge. By developing biodegradable mRNA nanoparticles to target circulating monocytes, which are white blood cells in the bloodstream, the team aims to create more potent mRNA-based immunotherapies that target solid tumors and metastatic cancers.
In other Mao-led NIH-funded projects, he is collaborating with Sami Tuffaha, an associate professor of plastic and reconstructive surgery at the Johns Hopkins School of Medicine to develop nanoparticles to aid persistent nerve regeneration and improve functional recoveries for patients suffering from peripheral nerve injuries, and with Sashank Reddy— also an associate professor of plastic and reconstructive surgery and associate director of the INBT—to develop a nanofiber-hydrogel composite to promote vascularized soft tissue regeneration that could be used for facial reconstruction and to address tissue loss after cancer surgery. These findings, “Kinetic Assembly of Polymer-mRNA Nanoparticles Targets Circulating Monocytes to Enhance Cancer Immunotherapy,” are presented in RePORTER.
Through an NIH-funded partnership with the University of Washington and the University of South Florida, Mao is working to better understand, treat, and prevent infectious diseases such as malaria. In 2023, there were more than 150 million infections globally, leading to more than 600,000 deaths.
“We seek to improve defense against malaria by generating liver-resident T cells, which block the parasite lifecycle in the patient’s liver,” Mao said. This strategy will help improve the potency to stop the spread of malaria and provide protection for people in endemic and non-endemic regions.
Mao acknowledges the NIH for enabling these advances in medical research.
“The NIH has supported large-scale studies like these for generations and has been critical to research that directly impacts our health today. Continued funding from the NIH is critical to solve complex health challenges we are facing globally,” he said.