Nasal priming with immunobiotic lactobacilli improves the adaptive immune response against influenza virus

Fernanda Raya Tonetti, Md Aminul Islam, Maria Guadalupe Vizoso-Pinto, Hideki Takahashi, Haruki Kitazawa, Julio Villena

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


The nasal priming with Lactobacillus rhamnosus CRL1505 modulates the respiratory antiviral innate immune response and improves protection against influenza virus (IFV) challenge in mice. However, the potential beneficial effect of the CRL1505 strain on the adaptive immune response triggered by IFV infection or vaccination was not evaluated before. In this work, we demonstrated that nasally administered L. rhamnosus CRL1505 is able to improve both the humoral and cellular adaptive immune responses induced by IFV infection or vaccination. Higher levels of IFV-specific IgA and IgG as well as IFN-γ were found in the serum and the respiratory tract of CRL1505-treated mice after IFV challenge. Lactobacilli treated mice also showed reduced concentrations of IL-17 and improved levels of IL-10 during IFV infection. The differential balance of inflammatory and regulatory cytokines induced by L. rhamnosus CRL1505 contributed to the protection against IFV by favoring an effective effector immune response without inducing inflammatory-mediated lung damage. The optimal immunomodulatory effect of the CRL1505 strain was achieved with viable bacteria. However, non-viable L. rhamnosus CRL1505 was also efficient in improving the adaptive immune responses generated by IFV challenges and therefore, emerged as an interesting alternative for vaccination of immunocompromised hosts. Similar to other immunomodulatory properties of lactobacilli, it was shown here that the adjuvant effect in the context of IFV vaccination was a strain dependent ability, since differences were found when L. rhamnosus CRL1505 and the immunomodulatory strain L. rhamnosus IBL027 were compared. This investigation represents a thorough exploration of the role of immunobiotic lactobacilli in improving humoral and cellular adaptive immune responses against IFV in the context of both infection and vaccination.

Original languageEnglish
Article number106115
JournalInternational Immunopharmacology
Publication statusPublished - 2020 Jan


  • Adaptive immune response
  • Immunobiotics
  • Influenza virus
  • Lactobacillus rhamnosus CRL1505
  • Respiratory immunity
  • Vaccination

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology
  • Pharmacology


Dive into the research topics of 'Nasal priming with immunobiotic lactobacilli improves the adaptive immune response against influenza virus'. Together they form a unique fingerprint.

Cite this