tetano
Editor, Senior Moderator
Front Cell Infect Microbiol
. 2022 Jun 13;12:924725.
doi: 10.3389/fcimb.2022.924725. eCollection 2022.
Oral SARS-CoV-2 Inoculation Causes Nasal Viral Infection Leading to Olfactory Bulb Infection: An Experimental Study
Rumi Ueha[SUP] 1 2 [/SUP], Toshihiro Ito[SUP] 3 [/SUP], Ryutaro Furukawa[SUP] 3 [/SUP], Masahiro Kitabatake[SUP] 3 [/SUP], Noriko Ouji-Sageshima[SUP] 3 [/SUP], Satoshi Ueha[SUP] 4 [/SUP], Misaki Koyama[SUP] 2 [/SUP], Tsukasa Uranaka[SUP] 2 [/SUP], Kenji Kondo[SUP] 2 [/SUP], Tatsuya Yamasoba[SUP] 2 [/SUP]
Affiliations
Abstract
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infections can cause long-lasting anosmia, but the impact of SARS-CoV-2 infection, which can spread to the nasal cavity via the oral route, on the olfactory receptor neuron (ORN) lineage and olfactory bulb (OB) remains undetermined. Using Syrian hamsters, we explored whether oral SARS-CoV-2 inoculation can lead to nasal viral infection, examined how SARS-CoV-2 affects the ORN lineage by site, and investigated whether SARS-CoV-2 infection can spread to the OB and induce inflammation. On post-inoculation day 7, SARS-CoV-2 presence was confirmed in the lateral area (OCAM-positive) but not the nasal septum of NQO1-positive and OCAM-positive areas. The virus was observed partially infiltrating the olfactory epithelium, and ORN progenitor cells, immature ORNs, and mature ORNs were fewer than in controls. The virus was found in the olfactory nerve bundles to the OB, suggesting the nasal cavity as a route for SARS-CoV-2 brain infection. We demonstrated that transoral SARS-CoV-2 infection can spread from the nasal cavity to the central nervous system and the possibility of central olfactory dysfunction due to SARS-CoV-2 infection. The virus was localized at the infection site and could damage all ORN-lineage cells.
Keywords: COVID-19; SARS-CoV-2; olfactory bulb; olfactory dysfunction; olfactory epithelium; oral inoculation; zone.
. 2022 Jun 13;12:924725.
doi: 10.3389/fcimb.2022.924725. eCollection 2022.
Oral SARS-CoV-2 Inoculation Causes Nasal Viral Infection Leading to Olfactory Bulb Infection: An Experimental Study
Rumi Ueha[SUP] 1 2 [/SUP], Toshihiro Ito[SUP] 3 [/SUP], Ryutaro Furukawa[SUP] 3 [/SUP], Masahiro Kitabatake[SUP] 3 [/SUP], Noriko Ouji-Sageshima[SUP] 3 [/SUP], Satoshi Ueha[SUP] 4 [/SUP], Misaki Koyama[SUP] 2 [/SUP], Tsukasa Uranaka[SUP] 2 [/SUP], Kenji Kondo[SUP] 2 [/SUP], Tatsuya Yamasoba[SUP] 2 [/SUP]
Affiliations
- PMID: 35770069
- PMCID: PMC9234459
- DOI: 10.3389/fcimb.2022.924725
Abstract
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infections can cause long-lasting anosmia, but the impact of SARS-CoV-2 infection, which can spread to the nasal cavity via the oral route, on the olfactory receptor neuron (ORN) lineage and olfactory bulb (OB) remains undetermined. Using Syrian hamsters, we explored whether oral SARS-CoV-2 inoculation can lead to nasal viral infection, examined how SARS-CoV-2 affects the ORN lineage by site, and investigated whether SARS-CoV-2 infection can spread to the OB and induce inflammation. On post-inoculation day 7, SARS-CoV-2 presence was confirmed in the lateral area (OCAM-positive) but not the nasal septum of NQO1-positive and OCAM-positive areas. The virus was observed partially infiltrating the olfactory epithelium, and ORN progenitor cells, immature ORNs, and mature ORNs were fewer than in controls. The virus was found in the olfactory nerve bundles to the OB, suggesting the nasal cavity as a route for SARS-CoV-2 brain infection. We demonstrated that transoral SARS-CoV-2 infection can spread from the nasal cavity to the central nervous system and the possibility of central olfactory dysfunction due to SARS-CoV-2 infection. The virus was localized at the infection site and could damage all ORN-lineage cells.
Keywords: COVID-19; SARS-CoV-2; olfactory bulb; olfactory dysfunction; olfactory epithelium; oral inoculation; zone.