Sex Differences in Lung Imaging and SARS-Cov-2 Antibody Responses in a COVID-19 3 Golden Syrian Hamster Model 4 5 Santosh Dhakala,*, Camilo A
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bioRxiv preprint doi: https://doi.org/10.1101/2021.04.02.438292; this version posted April 4, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 1 Submitted to mBio on: 31 March 2021 2 Sex differences in lung imaging and SARS-CoV-2 antibody responses in a COVID-19 3 golden Syrian hamster model 4 5 Santosh Dhakala,*, Camilo A. Ruiz-Bedoyab,*, Ruifeng Zhoua, Patrick S. Creishera, Jason S. 6 Villanoc, Kirsten Littlefielda, Jennie Ruelas Castillod, Paula Marinhoa, Anne Jedlickaa, Alvaro A. 7 Ordonezb, Natalia Majewskie, Michael J. Betenbaughe, Kelly Flavahanb, Alice L. Muellera, 8 Monika M. Looneyd, Darla Quijadad, Filipa Motab, Sarah E. Beckc, Jacqueline Brockhurstc, 9 Alicia Braxtonc, Natalie Castellc, Franco R. D’Alessiod, Kelly A. Metcalf Patec, Petros C. 10 Karakousisd, Joseph L. Mankowskic,† ,Andrew Pekosza,†, Sanjay K. Jainb,†, and Sabra L. Kleina,† 11 for the Johns Hopkins COVID-19 Hamster Study Group‡ 12 aW. Harry Feinstone Department of Molecular Microbiology and Immunology, The Johns 13 Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA 14 bDepartment of Pediatrics, The Johns Hopkins University School of Medicine, Baltimore, 15 Maryland, USA 16 cDepartment of Molecular and Comparative Pathobiology, The Johns Hopkins School of 17 Medicine, Baltimore, Maryland, USA 18 dDepartment of Medicine, The Johns Hopkins School of Medicine, Baltimore, Maryland, USA 19 eAdvanced Mammalian Biomanufacturing Innovation Center, Department of Chemical and 20 Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland, USA. 21 fDepartment of Epidemiology, The Johns Hopkins Bloomberg School of Public Health, 22 Baltimore, Maryland, USA 23 gDepartment of Oncology, The Johns Hopkins School of Medicine, The Sidney Kimmel 24 Comprehensive Cancer Center, Baltimore, MD, USA 25 *co-first authors 26 †To whom correspondence should be addressed: Sabra Klein, [email protected] 27 Sanjay Jain, [email protected], Andrew Pekosz, [email protected] , Joseph Mankowski, 28 [email protected] 29 ‡additional Johns Hopkins COVID-19 Hamster Study Group members: Cory F. Braytonc, Lisa 30 Pietersea, Bess Carlsonc, Selena Guerrero-Martinc, Eric K. Hutchinsonc, Andrew L. Johansonc, 31 Maggie Lowmanc, Amanda Maxwellc, Megan E. McCarronc, Kathleen R. Mulkac, Suzanne E. 32 Queenc, Erin N. Shirkc, Clarisse V. Solisc, Mitchel Stoverc, Patrick M. Tarwaterf, Rebecca T. 33 Veenhuisc, Rachel Visteinc, and Cynthia A. Zahnowg 34 Key words: animal model, COVID-19, sex differences, SARS-CoV-2 variants, receptor binding 35 domain 36 Running title: Sex differences in SARS-CoV-2 in golden Syrian hamsters 37 One Sentence Summary: Following SARS-CoV-2 infection, male hamsters experience worse 38 clinical disease and have lower antiviral antibody responses than females. bioRxiv preprint doi: https://doi.org/10.1101/2021.04.02.438292; this version posted April 4, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. Dhakal and Ruiz-Bedoya et al. 2 39 Abstract: 40 In the ongoing coronavirus disease 2019 (COVID-19) pandemic caused by the severe 41 acute respiratory syndrome coronavirus 2 (SARS-CoV-2), more severe outcomes are reported in 42 males compared with females, including hospitalizations and deaths. Animal models can provide 43 an opportunity to mechanistically interrogate causes of sex differences in the pathogenesis of 44 SARS-CoV-2. Adult male and female golden Syrian hamsters (8-10 weeks of age) were 5 45 inoculated intranasally with 10 TCID50 of SARS-CoV-2/USA-WA1/2020 and euthanized at 46 several time points during the acute (i.e., virus actively replicating) and recovery (i.e., after the 47 infectious virus has been cleared) phases of infection. There was no mortality, but infected male 48 hamsters experienced greater morbidity, losing a greater percentage of body mass, developing 49 more extensive pneumonia as noted on chest computed tomography, and recovering more slowly 50 than females. Treatment of male hamsters with estradiol did not alter pulmonary damage. Virus 51 titers in respiratory tissues, including nasal turbinates, trachea, and lungs, and pulmonary 52 cytokine concentrations, including IFN and TNF, were comparable between the sexes. 53 However, during the recovery phase of infection, females mounted two-fold greater IgM, IgG, 54 and IgA responses against the receptor-binding domain of the spike protein (S-RBD) in both 55 plasma and respiratory tissues. Female hamsters also had significantly greater IgG antibodies 56 against whole inactivated SARS-CoV-2 and mutant S-RBDs, as well as virus neutralizing 57 antibodies in plasma. The development of an animal model to study COVID-19 sex differences 58 will allow for a greater mechanistic understanding of the SARS-CoV-2 associated sex 59 differences seen in the human population. 60 61 2 bioRxiv preprint doi: https://doi.org/10.1101/2021.04.02.438292; this version posted April 4, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. Dhakal and Ruiz-Bedoya et al. 3 62 Importance: 63 Men experience more severe outcomes from COVID-19 than women. Golden Syrian hamsters 64 were used to explore sex differences in the pathogenesis of a human clinical isolate of SARS- 65 CoV-2. After inoculation, male hamsters experienced greater sickness, developed more severe 66 lung pathology, and recovered more slowly than females. Sex differences in disease could not be 67 reversed by estradiol treatment in males and were not explained by either virus replication 68 kinetics or the concentrations of inflammatory cytokines in the lungs. During the recovery 69 period, antiviral antibody responses in the respiratory tract and plasma, including to newly 70 emerging SARS-CoV-2 variants, were greater in females than male hamsters. Greater lung 71 pathology during the acute phase combined with reduced antiviral antibody responses during the 72 recovery phase of infection in males than females illustrate the utility of golden Syrian hamsters 73 as a model to explore sex differences in the pathogenesis of SARS-CoV-2 and vaccine-induced 74 immunity and protection. 3 bioRxiv preprint doi: https://doi.org/10.1101/2021.04.02.438292; this version posted April 4, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. Dhakal and Ruiz-Bedoya et al. 4 75 Introduction 76 At the start of the coronavirus disease 2019 (COVID-19) pandemic, early publications 77 from Wuhan, China (1, 2) and European countries (3) began reporting male biases in 78 hospitalization, intensive care unit (ICU) admissions, and mortality rates. Ongoing real-time 79 surveillance (4) and meta-analyses of over 3 million cases of COVID-19 (5) continue to show 80 that while the incidence of COVID-19 cases are similar between the sexes, adult males are 81 almost 3-times more likely to be admitted into ICUs and twice as likely to die as females. 82 Differential exposure to the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is 83 likely associated with behaviors, occupations, comorbidities and societal and cultural norms (i.e., 84 gender differences) that impact the probability of exposure, access to testing, utilization of 85 healthcare, and risk of disease (6-8). This is distinct but also complementary to biological sex 86 differences (i.e., sex chromosome complement, reproductive tissues, and sex steroid hormone 87 concentrations) that can also impact susceptibility and outcomes from COVID-19 (9, 10). While 88 exposure to SARS-CoV-2 may differ based on gender, the increased mortality rate among males 89 in diverse countries and at diverse ages likely reflect biological sex. Studies have shown that in 90 males, mutations in X-linked genes (e.g., TLR7) resulting in reduced interferon signaling (11), 91 elevated proinflammatory cytokine production (e.g., IL-6 and CRP) (2, 12), reduced CD8+ T cell 92 activity (e.g., IFN-) (13), and greater antibody responses (i.e., anti-SARS-CoV-2 antigen- 93 specific IgM, IgG, and IgA, and neutralizing antibodies) (14) are associated with more severe 94 COVID-19 outcomes as compared with females. Because COVID-19 outcomes can be impacted 95 by both gender and biological sex, consideration of the intersection of these contributors is 96 necessary in human studies (15). 4 bioRxiv preprint doi: https://doi.org/10.1101/2021.04.02.438292; this version posted April 4, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. Dhakal and Ruiz-Bedoya et al. 5 97 Animal models can mechanistically explore sex differences in the pathogenesis of SARS- 98 CoV-2 independent of confounding gender-associated factors that impact exposure, testing, and 99 use of healthcare globally. Transgenic mice expressing human ACE2 (K18-hACE2) are 100 susceptible to SARS-CoV-2 and in this model, males experience greater morbidity than females, 101 despite having similar viral loads in respiratory tissues (e.g., nasal turbinates, trachea, and lungs) 102 (16, 17). Transcriptional analyses of lung tissue revealed that inflammatory cytokine and 103 chemokine gene expression is greater in males than females early during infection, and these 104 transcriptional patterns show a stronger correlation with disease outcomes among males than 105 females (16, 17). In addition to utilizing hACE2 mice, mouse-adapted strains of SARS-CoV-2 106 have been developed and can productively infect wild-type mice but have not yet been used to 107 evaluate sex-specific differences in the pathogenesis of disease (18-20). 108 Golden Syrian hamsters are also being used as an animal model of SARS-CoV-2 109 pathogenesis because they are susceptible to human clinical strains of viruses, without the need 110 for genetic modifications in either the host or virus.