title: TMPRSS2 activates the human coronavirus 229E for cathepsin-independent host cell entry and is expressed in viral target cells in the respiratory epithelium.
abstract: Infection with human coronavirus 229E (HCoV-229E) is associated with the common cold and may result in pneumonia in immunocompromised patients. The viral spike (S) protein is incorporated into the viral envelope and mediates infectious entry of HCoV-229E into host cells, a process that depends on the activation of the S-protein by host cell proteases. However, the proteases responsible for HCoV-229E activation are incompletely defined. Here we show that the type II transmembrane serine proteases TMPRSS2 and HAT cleave the HCoV-229E S-protein (229E-S) and augment 229E-S-driven cell-cell fusion, suggesting that TMPRSS2 and HAT can activate 229E-S. Indeed, engineered expression of TMPRSS2 and HAT rendered 229E-S-driven virus-cell fusion insensitive to an inhibitor of cathepsin L, a protease previously shown to facilitate HCoV-229E infection. Inhibition of endogenous cathepsin L or TMPRSS2 demonstrated that both proteases can activate 229E-S for entry into cells that are naturally susceptible to infection. In addition, evidence was obtained that activation by TMPRSS2 rescues 229E-S-dependent cell entry from inhibition by IFITM proteins. Finally, immunohistochemistry revealed that TMPRSS2 is coexpressed with CD13, the HCoV-229E receptor, in human airway epithelial (HAE) cells, and that CD13(+) TMPRSS2(+) cells are preferentially targeted by HCoV-229E, suggesting that TMPRSS2 can activate HCoV-229E in infected humans. In sum, our results indicate that HCoV-229E can employ redundant proteolytic pathways to ensure its activation in host cells. In addition, our observations and previous work suggest that diverse human respiratory viruses are activated by TMPRSS2, which may constitute a target for antiviral intervention.
authors.affiliation: Institute of Virology, Hannover Medical School, Hannover, Germany.
authors.forename: Stephanie
authors.initials: S
authors.lastname: Bertram
authors.forename: Ronald
authors.initials: R
authors.lastname: Dijkman
authors.forename: Matthias
authors.initials: M
authors.lastname: Habjan
authors.forename: Adeline
authors.initials: A
authors.lastname: Heurich
authors.forename: Stefanie
authors.initials: S
authors.lastname: Gierer
authors.forename: Ilona
authors.initials: I
authors.lastname: Glowacka
authors.forename: Kathrin
authors.initials: K
authors.lastname: Welsch
authors.forename: Michael
authors.initials: M
authors.lastname: Winkler
authors.forename: Heike
authors.initials: H
authors.lastname: Schneider
authors.forename: Heike
authors.initials: H
authors.lastname: Hofmann-Winkler
authors.forename: Volker
authors.initials: V
authors.lastname: Thiel
authors.forename: Stefan
authors.initials: S
authors.lastname: Pöhlmann
mesh_terms: D002403:Cathepsins / Q000235:genetics / Q000378:metabolism*; D002460:Cell Line; D028941:Coronavirus 229E, Human / Q000235:genetics / Q000502:physiology*; D018352:Coronavirus Infections / Q000201:enzymology* / Q000235:genetics / Q000821:virology; D015870:Gene Expression; D051548:Histone Acetyltransferases / Q000235:genetics / Q000378:metabolism; D006801:Humans; D020545:Respiratory Mucosa / Q000201:enzymology* / Q000821:virology; D012697:Serine Endopeptidases / Q000235:genetics / Q000378:metabolism*; D053586:Virus Internalization
chemical_list: D051548:Histone Acetyltransferases; D002403:Cathepsins; D012697:Serine Endopeptidases; C421305:TMPRSS2 protein, human
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