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A chewing gum laced with a plant-grown protein serves as a “trap” for the SARS-CoV-2 virus, reducing viral load in saliva and potentially tamping down transmission, according to a new study.
The work, led by Henry Daniell at Penn’s School of Dental Medicine and performed in collaboration with scientists at the Perelman School of Medicine and School of Veterinary Medicine, as well as at The Wistar Institute and Fraunhofer USA, could lead to a low-cost tool in the arsenal against the COVID-19 pandemic. Their study was published in the journal Molecular Therapy.
“SARS-CoV-2 replicates in the salivary glands, and we know that when someone who is infected sneezes, coughs, or speaks some of that virus can be expelled and reach others,” says Daniell. “This gum offers an opportunity to neutralize the virus in the saliva, giving us a simple way to possibly cut down on a source of disease transmission.”
Vaccinations for COVID-19 have helped change the course of the pandemic but haven’t stamped out transmission. Even people who are fully vaccinated can still become infected with SARS-CoV-2 and, according to recent research, can carry a viral load similar to those who are unvaccinated.
Prior to the pandemic, Daniell had been studying the angiotensin-converting enzyme 2 (ACE2) protein in the context of treating hypertension. His lab had grown this protein, as well as many others that may have therapeutic potential, using a patented plant-based production system. By bombarding plant material with the DNA of target proteins, they coax plant chloroplasts to take up the DNA and begin growing the proteins. The plant material, freeze-dried and ground-up, could be used as a means of delivering the protein. This system has the potential to avoid the usual obstacles to protein drug synthesis: namely, an expensive production and purification process.
Daniell’s past work on ACE2 proved fortuitous in the context of the COVID-19 pandemic. The receptor for ACE2 on human cells also happens to bind the SARS-CoV-2 spike protein. Other research groups have shown that injections of ACE2 can reduce viral load in people with severe infections.
Meanwhile, another line of work by Daniell and Penn Dental Medicine colleague Hyun (Michel) Koo has involved research to develop a chewing gum infused with plant-grown proteins to disrupt dental plaque. Pairing his insights about ACE2 with this technology, Daniell wondered if such a gum, infused with plant-grown ACE2 proteins, could neutralize SARS-CoV-2 in the oral cavity.
To find out, he reached out to Ronald Collman at Penn Medicine, a virologist and pulmonary and critical care doctor whose team, since the early stages of the pandemic, had been collecting blood, nasal swabs, saliva, and other biospecimens from COVID patients for scientific research.
“Henry contacted me and asked if we had samples to test his approach, what kind of samples would be appropriate to test, and whether we could internally validate the level of SARS-CoV-2 virus in the saliva samples,” Collman says. “That led to a cross-school collaboration building on our microbiome studies.”
To test the chewing gum, the team grew ACE2 in plants, paired with another compound that enables the protein to cross mucosal barriers and facilitates binding, and incorporated the resulting plant material into cinnamon-flavored gum tablets. Incubating samples obtained from nasopharyngeal swabs from COVID-positive patients with the gum, they showed that the ACE2 present could neutralize SARS-CoV-2 viruses.
Those initial investigations were followed by others at The Wistar Institute and Penn Vet, in which viruses, less-pathogenic than SARS-CoV-2, were modified to express the SARS-CoV-2 spike protein. The scientists observed that the gum largely prevented the viruses or viral particles from entering cells, either by blocking the ACE2 receptor on the cells or by binding directly to the spike protein.
Finally, the team exposed saliva samples from COVID-19 patients to the ACE2 gum and found that levels of viral RNA fell so dramatically to be almost undetectable.
The research team is currently working toward obtaining permission to conduct a clinical trial to evaluate whether the approach is safe and effective when tested in people infected with SARS-CoV-2 .
“Henry’s approach of making the proteins in plants and using them orally is inexpensive, hopefully scalable; it really is clever,” Collman says.
Though the research is still in early stages of development, if the clinical trials prove the gum is safe and effective, it could be given to patients whose infection status is unknown or even for a dental check-ups when masks must be removed, to reduce the likelihood of passing the virus to caregivers.
“We are already using masks and other physical barriers to reduce the chance of transmission,” says Daniell. “This gum could be used as an additional tool in that fight.”
Henry Daniell is vice chair and the W. D. Miller Professor in the Department of Basic and Translational Sciences in the University of Pennsylvania School of Dental Medicine.
Ronald Collman is a professor of medicine and microbiology and director of the Penn Center for AIDS Research at the University of Pennsylvania’s Perelman School of Medicine.
Daniell’s coauthors on the paper were Penn Dental Medicine’s Smruti K. Nair, Nardana Esmaeili, Geetanjali Wakade, Naila Shahid, Prem Kumar Ganesan, Md Reyazul Islam, Manunya Nuth, and Robert Ricciardi; Penn Medicine’s Sheng Feng, Selene Nuñez Cruz, Jevon Graham-Wooten, Michael Milone, Ping Wang, Kenneth B. Margulies, and Ronald G. Collman; Penn Vet’s Ariel Shepley-McTaggart and Ronald N. Harty; The Wistar Institute’s Ebony N. Gary, Ali R. Ali, and David B. Weiner; and Fraunhofer USA’s Stephen J. Streatfield, Rubén Montoya-López, Paul Kaznica, Margaret Mawson, and Brian J. Green.
Daniell is a patentee in this field. Relevant information on patents and applications is available here.
The study was supported by the National Institutes of Health (grants HL107904, HL109442, HL133191, HL137063, and AI070077), the Commonwealth of Pennsylvania, the University of Pennsylvania School of Veterinary Medicine COVID-19 Pilot Award, a Mercatus Center award, the Penn Center for Precision Medicine, Penn Health-Tech, the Penn Center for Innovation and Precision Dentistry, and the NIH RADx program.
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