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Current anti-influenza drugs target viral proteins; however, the emergence of resistant strains has hampered their effectiveness. Fortunately, as with most viruses, influenza virus depends on various host factors during its replication cycle and in pathogenicity. Therefore, the manipulation of key host factors for viral replication to combat influenza has garnered increased attention due to its lesser tendency to induce viral mutation. Cyclin-dependent kinases (CDKs) are a family of protein kinases that regulate various cellular processes, including the cell cycle and transcription. While the specific involvement of CDKs in the transcription of influenza virus genes is less extensively studied than their roles in the cell cycle, some evidence suggests their potential contributions as anti-influenza drugs. Here, we report that LDC000067 (LDC), a highly specific CDK9 inhibitor, not only strongly suppressed influenza virus replication\n              <jats:italic>in vitro<\/jats:italic>\n              and\n              <jats:italic>in vivo<\/jats:italic>\n              but also emerged as a potential candidate for anti-influenza virus agents. Further investigation revealed that inhibition of CDK9 by LDC treatment and CDK9 silencing disrupts viral RNA transcription and the nuclear import of vRNPs, significantly suppressing influenza virus replication. Mechanistically, we showed that LDC treatment and CDK9 silencing reduce Pol II expressions, a requisite host protein for viral RNA transcription. Altogether, our findings indicate that CDK9 could be a promising target for developing antivirals against influenza virus infections, and LDC, with its strong anti-influenza properties, instills confidence in its potential as an effective anti-influenza agent.\n            <\/jats:p>\n          <\/jats:sec>","DOI":"10.1128\/aac.01172-24","type":"journal-article","created":{"date-parts":[[2024,11,20]],"date-time":"2024-11-20T14:00:57Z","timestamp":1732111257000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":5,"title":["LDC000067, a CDK9 inhibitor, unveils promising results in suppressing influenza virus infections\n            <i>in vitro<\/i>\n            and\n            <i>in vivo<\/i>"],"prefix":"10.1128","volume":"69","author":[{"given":"Mingxin","family":"Zhang","sequence":"first","affiliation":[{"name":"Department of Immunology and Microbiology, Institute of Medical Microbiology, College of Life Science and 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