Scientific Reports (Sep 2023)

Assessment of safety and intranasal neutralizing antibodies of HPMC-based human anti-SARS-CoV-2 IgG1 nasal spray in healthy volunteers

  • Thanarath Imsuwansri,
  • Thitinan Jongthitinon,
  • Niramon Pojdoung,
  • Nuntana Meesiripan,
  • Siriwan Sakarin,
  • Chatikorn Boonkrai,
  • Tossapon Wongtangprasert,
  • Tanapati Phakham,
  • Thittaya Audomsun,
  • Chadaporn Attakitbancha,
  • Pijitra Saelao,
  • Phijitra Muanwien,
  • Maoxin Tim Tian,
  • Songsak Tongchusak,
  • Bhrus Sangruji,
  • Dhammika Leshan Wannigama,
  • Chenphop Sawangmake,
  • Watchareewan Rodprasert,
  • Quynh Dang Le,
  • Steven Dwi Purbantoro,
  • Kananuch Vasuntrarak,
  • Sirirat Nantavisai,
  • Supakit Sirilak,
  • Ballang Uppapong,
  • Sompong Sapsutthipas,
  • Sakalin Trisiriwanich,
  • Thitiporn Somporn,
  • Asmah Usoo,
  • Natthakarn Mingngamsup,
  • Supaporn Phumiamorn,
  • Porawan Aumklad,
  • Kwanputtha Arunprasert,
  • Prasopchai Patrojanasophon,
  • Praneet Opanasopit,
  • Norapath Pesirikan,
  • Ladda Nitisaporn,
  • Jesada Pitchayakorn,
  • Thana Narkthong,
  • Bancha Mahong,
  • Kumchol Chaiyo,
  • Kanjana Srisutthisamphan,
  • Ratchanont Viriyakitkosol,
  • Songklot Aeumjaturapat,
  • Anan Jongkaewwattana,
  • Sakarn Bunnag,
  • Trairak Pisitkun

DOI
https://doi.org/10.1038/s41598-023-42539-7
Journal volume & issue
Vol. 13, no. 1
pp. 1 – 12

Abstract

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Abstract An HPMC-based nasal spray solution containing human IgG1 antibodies against SARS-CoV-2 (nasal antibody spray or NAS) was developed to strengthen COVID-19 management. NAS exhibited potent broadly neutralizing activities against SARS-CoV-2 with PVNT50 values ranging from 0.0035 to 3.1997 μg/ml for the following variants of concern (ranked from lowest to highest): Alpha, Beta, Gamma, ancestral, Delta, Omicron BA.1, BA.2, BA.4/5, and BA.2.75. Biocompatibility assessment showed no potential biological risks. Intranasal NAS administration in rats showed no circulatory presence of human IgG1 anti-SARS-CoV-2 antibodies within 120 h. A double-blind, randomized, placebo-controlled trial (NCT05358873) was conducted on 36 healthy volunteers who received either NAS or a normal saline nasal spray. Safety of the thrice-daily intranasal administration for 7 days was assessed using nasal sinuscopy, adverse event recording, and self-reporting questionnaires. NAS was well tolerated, with no significant adverse effects during the 14 days of the study. The SARS-CoV-2 neutralizing antibodies were detected based on the signal inhibition percent (SIP) in nasal fluids pre- and post-administration using a SARS-CoV-2 surrogate virus neutralization test. SIP values in nasal fluids collected immediately or 6 h after NAS application were significantly increased from baseline for all three variants tested, including ancestral, Delta, and Omicron BA.2. In conclusion, NAS was safe for intranasal use in humans to increase neutralizing antibodies in nasal fluids that lasted at least 6 h.