December 04, 2018 | Nora Samaranayake
Research Suggests that Bacterial Infections May Contribute Far More to Cancers Than Previously Thought
The Institute of Human Virology (IHV) at the University of Maryland School of Medicine (UMSOM) announced today the discovery that DnaK, a protein of the bacterium mycoplasma, interferes with the mycoplasma-infected cell’s ability to respond to and repair DNA damage, a known origin of cancer.
Members of this research team include those pictured here: Fiorenza Cocchi, MD, Francesca Benedetti, PhD, Davide Zella, PhD, Robert Gallo, MD, Sabrina Curreli, PhD, and Selvi Krishnan, PhD
Little or no mycoplasma DnaK DNA sequences were found associated with the tumor, which was fully developed, suggesting a hit-and-run or hide mechanism of transformation, indicating that the damage is done early, but the protein may not be needed once the cancer cells are formed.
The study was published in the Proceedings of the National Academy of Sciences and suggests that bacterial infections may contribute to far more cancers than previously thought. The announcement was made by Robert Gallo, MD, The Homer & Martha Gudelsky Distinguished Professor in Medicine and Co-Founder and Director, Institute of Human Virology, University of Maryland School of Medicine and Davide Zella, PhD, Assistant Professor of Biochemistry and Molecular Biology, Institute of Human Virology, University of Maryland School of Medicine. Drs. Gallo and Zella collaborated with Hervé Tettelin, PhD, Associate Professor of Microbiology and Immunology, Institute for Genome Sciences, University of Maryland School of Medicine.
“Currently, approximately 20% of cancers are thought to be caused by infection, most are known to be due to viruses,” said Dr. Gallo. who is also Co-Founder and Director of the Global Virus Network. “Mycoplasmas are a family of bacteria that are associated with cancers, especially in people with HIV. Our work provides an explanation for how a bacterial infection can trigger a series of events that lead to cancer. Of particular importance, the infection did not need to persist and the protein did not need to be continuously present in all cancer cells. The study also provides a mechanism for how some bacterial infections can interfere with specific cancer drugs.”
Researchers utilized immune-compromised mice as a model for analyzing the effect of mycoplasma infection on the development of lymphoma. They compared how quickly non-infected immune-compromised mice developed lymphoma compared to mycoplasma-infected immune-compromised mice. The mice were infected with a strain of mycoplasma from an HIV patient. The researchers found that mycoplasma infection caused the mice to develop lymphoma earlier in life than non-infected immune-compromised mice and that some, but not all, of the cancer cells had bacterial DNA. Finding only a small amount of bacterial DNA in the cancer cells suggested that the infection did not have to persist to trigger cancer.
“We focused on a protein called DnaK, which is part of a family of proteins that function as a ‘chaperone’ for other proteins protecting them from damage or helping them to fold,” said Dr. Zella. “However, in this case, DnaK reduces the activity of important cellular proteins involved in DNA repair and anti-cancer-activities, such as p53. Thus, cells infected with mycoplasma would not be able to properly repair damaged DNA, thus, potentially increasing the risk for cancer development.”
The scientists noted that the bacteria can release DnaK and the DnaK enters nearby uninfected cells. The study also demonstrates that by reducing p53, DnaK can also reduce the efficacy of anti-cancer drugs. Thus, mycoplasma infection could not only trigger events leading to the accumulation of DNA damage and oncogenesis in infected cells, but also trigger cancer-causing events in nearby uninfected cells that took up DnaK released from infected neighboring cells.
“We analyzed the amino acid sequences of DnaK from many bacteria and found that the DnaK proteins from bacteria associated with cancer grouped together were different DnaK sequences from bacteria that are not associated with cancer,” said Dr. Tettelin. “This raises the possibility that other bacteria have the same cancer-promoting ability.”
According to Dr. Gallo, “This hit-and-run, or hide, mechanism mediated by a protein common to many cancer-associated bacteria changes how we need to think about infection and at least some cancers. Furthermore, this provides a basis for understanding how infection can influence the effectiveness of some cancer treatments.”
“This is fascinating science with important implications,” said UMSOM Dean E. Albert Reece, MD, PhD, MBA, who is also the Executive Vice President for Medical Affairs, University of Maryland, and the John Z. and Akiko K. Bowers Distinguished Professor. “We are pleased to see a cross-collaboration between two disciplines here at the University of Maryland School of Medicine. Our Institute of Human Virology’s basic science laboratory research was aided by the School’s Institute of Genome Sciences’ sequencing expertise, bringing the research to full fruition.”
This research was partially funded by the Maryland Cigarette Restitution Fund (CRF) Program. Morgan State University also participated in this study.
About the Institute of Human Virology
Formed in 1996 as a partnership between the State of Maryland, the City of Baltimore, the University System of Maryland and the University of Maryland Medical System, IHV is an institute of the University of Maryland School of Medicine and is home to some of the most globally-recognized and world-renowned experts in all of virology. The IHV combines the disciplines of basic research, epidemiology and clinical research in a concerted effort to speed the discovery of diagnostics and therapeutics for a wide variety of chronic and deadly viral and immune disorders - most notably, HIV the virus that causes AIDS. For more information, www.ihv.org and follow us on Twitter @IHVmaryland.
About the University of Maryland School of Medicine
Now in its third century, the University of Maryland School of Medicine was chartered in 1807 as the first public medical school in the United States. It continues today as one of the fastest growing, top-tier biomedical research enterprises in the world -- with 43 academic departments, centers, institutes, and programs; and a faculty of more than 3,000 physicians, scientists, and allied health professionals, including members of the National Academy of Medicine and the National Academy of Sciences, and a distinguished recipient of the Albert E. Lasker Award in Medical Research. With an operating budget of more than $1 billion, the School of Medicine works closely in partnership with the University of Maryland Medical Center and Medical System to provide research-intensive, academic and clinically-based care for more than 1.2 million patients each year. The School has over 2,500 students, residents, and fellows, and more than $530 million in extramural funding, with most of its academic departments highly ranked among all medical schools in the nation in research funding. As one of the seven professional schools that make up the University of Maryland, Baltimore campus, the School of Medicine has a total workforce of nearly 7,000 individuals. The combined School and Medical System (“University of Maryland Medicine”) has an annual budget of nearly $6 billion and an economic impact more than $15 billion on the state and local community. The School of Medicine faculty, which ranks as the 8th highest among public medical schools in research productivity, is an innovator in translational medicine, with 600 active patents and 24 start-up companies. The School works locally, nationally, and globally, with research and treatment facilities in 36 countries around the world. Visit medschool.umaryland.edu/
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Institute of Human Virology
Jennifer Gonzales
Public Relations & Communications Manager
jennifer.gonzales@ihv.umaryland.edu
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Wednesday, April 13, 2016
IHV Releases Data Supporting Community-Based Treatment Providers in Fight Against Hepatitis C
The Institute of Human Virology (IHV) at the University of Maryland School of Medicine released data today at The International Liver Congress 2016 in Barcelona, Spain demonstrating that treatment for hepatitis C virus (HCV) can be provided safely and effectively within a community-based and non-specialist setting.
Thursday, March 10, 2016
UM SOM Establishes Two Endowed Professorships Through Private Gifts and Matching State Funds
University of Maryland School of Medicine (UM SOM) Dean E. Albert Reece, MD, PhD, MBA, announced today that the School has been awarded matching funds from the Maryland Department of Business and Economic Development (DBED) as part of the Maryland E-Nnovation Initiative Fund program. The funds, when combined with private philanthropy, will enable UM SOM to establish two new endowed professorships – one in human virology and vaccine development, the other in surgical science and entrepreneurship.
Tuesday, December 01, 2015
A Statement from the Leadership of the Institute of Human Virology on World AIDS Day
Research enabled treatment to be developed for HIV/AIDS, allowing the Institute of Human Virology (IHV) at the University of Maryland School of Medicine (which Dr. Gallo heads and co-founded with his colleagues Drs. William Blattner and Robert Redfield) to develop a promising HIV vaccine candidate, treat nearly 6,000 patients annually in Baltimore, and care for more than 1 million people in Africa and the Caribbean since 2004.
Tuesday, September 29, 2015
Institute of Human Virology Hosts International Meeting of Prominent AIDS Researchers
The Institute of Human Virology (IHV) at the University of Maryland School of Medicine is hosting IHV’s 17th Annual International Meeting Sunday, September 27 through Wednesday, September 30 at the Baltimore Marriott Waterfront Hotel in Baltimore, Maryland.