Magot Diata OmokokoSabar PambudiSupranee PhanthanawiboonPromsin MasrinoulChayanee SetthapramoteTadahiro SasakiMotoki KuharaPongrama RamasootaAkifumi YamashitaItaru HiraiKazuyoshi IkutaTakeshi KurosuOsaka UniversityMahidol UniversityMedical & Biological Laboratories Co, LtdNational Institute of Infectious DiseasesUniversity of the Ryukyus2018-11-092018-11-092014-01-01American Journal of Tropical Medicine and Hygiene. Vol.91, No.1 (2014), 146-155000296372-s2.0-84903897345https://repository.li.mahidol.ac.th/handle/20.500.14594/34094The immune response to dengue virus (DENV) infection generates high levels of antibodies (Abs) against the DENV non-structural protein 1 (NS1), particularly in cases of secondary infection. Therefore, anti-NS1 Abs may play a role in severe dengue infections, possibly by interacting (directly or indirectly) with host factors or regulating virus production. If it does play a role, NS1 may contain epitopes that mimic those epitopes of host molecules. Previous attempts to map immunogenic regions within DENV-NS1 were undertaken using mouse monoclonal Abs (MAbs). The aim of this study was to characterize the epitope regions of nine anti-NS1 human monoclonal Abs (HuMAbs) derived from six patients secondarily infected with DENV-2. These anti-NS1 HuMAbs were cross-reactive with DENV-1, -2, and -3 but not DENV-4. All HuMAbs bound a common epitope region located between amino acids 221 and 266 of NS1. This study is the first report to map a DENV-NS1 epitope region using anti-DENV MAbs derived from patients. Copyright © 2014 by The American Society of Tropical Medicine and Hygiene.Mahidol UniversityImmunology and MicrobiologyMedicineArticleSCOPUS10.4269/ajtmh.13-0624