Trending With Impact: Humoral Immunoresponse Elicited Against COVID Vaccine in Elderly Patients



October 5, 2022

Aging-US published this trending research paper in Volume 14, Issue 18, entitled, "Humoral immunoresponse elicited against an adenoviral-based SARS-CoV-2 coronavirus vaccine in elderly patients" by researchers from Instituto de Investigación en Medicina Molecular y Celular Aplicada - IMMCA (UNT-CONICET-SIPROSA), Tucumán 4000, Argentina; Centro de Referencia para Lactobacilos – CERELA (CONICET), Tucumán 4000, Argentina; Public Healthcare Administration (SIPROSA), Tucumán 4000, Argentina; Néstor Kirchner Hospital, Central Public Health laboratory (LSP) (SIPROSA), Tucumán 4000, Argentina. DOI - Corresponding authors - Silvia Inés Cazorla -, Diego Ploper - Abstract The early sequencing of the SARS-CoV-2 viral genome allowed for a speedy development of effective vaccines against the virus. Nevertheless, age-related immunosenescence, the inability to mount strong immune responses, still represents a major obstacle. Here, in a group of 149 elderly volunteers (70–96 years old), evolution of the humoral immune response over time to Gam-COVID-Vac (Sputnik V), a vaccine based on heterologous recombinant adenovirus-26 (Ad26) and adenovirus-5 (Ad5) carrying the Spike genome, was analyzed by an anti-RBD ELISA. At 28 days post vaccination (dpv), a seroconversion rate of 91% was achieved, showing the importance of administering at least two doses of Gam-COVID-Vac to elicit a robust immune response, especially in elderly individuals without previous SARS-CoV-2 infection. Interestingly, IgG specific antibodies that reached their highest titers around 28 dpv (median = 740), persisted without significant decrease after 60 dpv (median = 650). After 90 dpv, IgG titers began to drop, and at 180 dpv only 44.7% of the elderly individuals remained with detectable anti-RBD IgG antibodies. No significant differences were observed in specific humoral immune responses between genders at early times point. However, at 60 dpv anti-RBD titers were more persistent in elderly females, and only dropped at 90 dpv (p < 0.0001). As expected, the highest antibodies titers were elicited in the youngest subgroup (70–74 years). Our results show that Gam-COVID-Vac was able to deal with the ageing of the immune system, eliciting a robust immune response in an elderly cohort, which lasted approximately 90 dpv at high levels, and protected against COVID-19. Sign up for free Altmetric alerts about this article - Keywords - aging, SARS-CoV-2, COVID-19, Gam-COVID-Vac, humoral immune response, elderly About Aging-US Launched in 2009, Aging-US publishes papers of general interest and biological significance in all fields of aging research and age-related diseases, including cancer—and now, with a special focus on COVID-19 vulnerability as an age-dependent syndrome. Topics in Aging-US go beyond traditional gerontology, including, but not limited to, cellular and molecular biology, human age-related diseases, pathology in model organisms, signal transduction pathways (e.g., p53, sirtuins, and PI-3K/AKT/mTOR, among others), and approaches to modulating these signaling pathways. Please visit our website at​​ and connect with us: SoundCloud - Facebook - Twitter - Instagram - YouTube -​ LinkedIn - Pinterest - Media Contact 18009220957 MEDIA@IMPACTJOURNALS.COM


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