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Collectively, viruses are the principal cause of cancers arising in patients with immune dysfunction, including human immunodeficiency virus (HIV)-positive patients. Kaposi sarcoma (KS) etiologically linked to Kaposi sarcoma-associated herpesvirus (KSHV) continues to be the most common AIDS-associated tumor. The involvement of the oral cavity represents one of the most common clinical manifestations of this tumor. HIV infection incurs an increased risk among individuals with periodontal diseases and oral carriage of a variety of pathogenic bacteria. However, whether interactions involving periodontal bacteria and oncogenic viruses in the local environment facilitate replication or maintenance of these viruses in the oral cavity of HIV-positive patients remain largely unknown. We previously showed that pathogen-associated molecular patterns (PAMPs) from specific periodontal bacteria promoted KSHV entry into oral cells and subsequent establishment of latency. In the current study, we demonstrate that Staphylococcus aureus, one of common pathogens causing infection in HIV-positive patients, and its PAMPs can effectively induce KSHV lytic reactivation from infected oral cells, through the Toll-like receptor reactive oxygen species and cyclin D1-Dicer-viral microRNA axis. This investigation provides further clinical evidence about the relevance of coinfection due to these 2 pathogens in the oral cavities of a cohort HIV-positive patients and reveals novel mechanisms through which these coinfecting pathogens potentially promote virus-associated cancer development in the unique niche of immunocompromised patients.

the journal of infectious diseases (online. university of chicago press)/the journal of infectious diseases

Kaposi Sarcoma–Associated Herpesvirus and Staphylococcus aureus Coinfection in Oral Cavities of HIV-Positive Patients: A Unique Niche for Oncogenic Virus Lytic Reactivation