title: Frequencies of human influenza-specific antibody secreting cells or plasmablasts post vaccination from fresh and frozen peripheral blood mononuclear cells.
abstract: The rise in influenza-specific neutralizing antibody levels is proceeded by a burst of antigen-specific antibody secreting cells (ASC) or plasmablasts identified in peripheral blood approximately 5-10 days post immunization. Blood antigen-specific ASC may function as an immune marker of vaccine responses in comparison to the pre- and post-neutralizing titers; however, some have questioned whether there is adequate survival of ASC isolated from peripheral blood after freezing, making multi-center vaccine trials difficult. Here, we demonstrate similar frequencies of influenza-specific ASC from fresh and frozen peripheral blood mononuclear cells (PBMC). Influenza Hemagglutinin (HA) H1, H3, and H7-specific ASC IgG ELISpots frequencies were compared from the same fresh and frozen PBMC 7 days after 2006 Trivalent Influenza Vaccine (TIV) in 10 young healthy subjects. H1-, H3-, and H7-specific IgG ASC spots/10(6) from fresh PBMC on day 7 were 229+/-341, 98+/-90, and 6+/-11 respectively. Total IgG ASC spots/million PBMC pre- and 7-day post-vaccination were 290+/-188 (0.029% PBMC) and 1691+/-836 (0.17% PBMC) respectively. There was no difference in the H1 -H3-, and total specific ASC IgG ELISpot frequencies from the fresh versus frozen PBMC on day 7 (p=0.43, 0.28, 0.28 respectively). These results demonstrate feasibility of testing whether antigen-specific ASC from frozen PBMC are an early biomarker of long-term antibody responses in multi-center vaccine trials.
authors.affiliation: Division of Pulmonary & Critical Care Medicine, NY 14642, USA.
authors.forename: Shuya Y
authors.initials: SY
authors.lastname: Kyu
authors.forename: James
authors.initials: J
authors.lastname: Kobie
authors.forename: Hongmei
authors.initials: H
authors.lastname: Yang
authors.forename: Martin S
authors.initials: MS
authors.lastname: Zand
authors.forename: David J
authors.initials: DJ
authors.lastname: Topham
authors.forename: Sally A
authors.initials: SA
authors.lastname: Quataert
authors.forename: Ignacio
authors.initials: I
authors.lastname: Sanz
authors.forename: F Eun-Hyung
authors.initials: FE
authors.lastname: Lee
mesh_terms: D000328:Adult; D000914:Antibodies, Viral / Q000097:blood; D000921:Antibody-Producing Cells / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D005434:Flow Cytometry; D019267:Hemagglutinin Glycoproteins, Influenza Virus / Q000276:immunology; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype / Q000276:immunology*; D053122:Influenza A Virus, H3N2 Subtype / Q000276:immunology*; D007252:Influenza Vaccines / Q000276:immunology* / Q000627:therapeutic use; D007251:Influenza, Human / Q000097:blood / Q000276:immunology* / Q000517:prevention & control; D007963:Leukocytes, Mononuclear / Q000276:immunology*; D008297:Male; D055815:Young Adult
chemical_list: D000914:Antibodies, Viral; D019267:Hemagglutinin Glycoproteins, Influenza Virus; D007252:Influenza Vaccines