Invasive and Non-invasive Clinical Haemophilus influenzae Type A  Isolates Activate Differentiated  HL-60 Cells In Vitro

Courtney Ferris; Marina Ulanova

doi:10.20411/pai.v9i1.659

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Published: Apr 17, 2024

DOI: https://doi.org/10.20411/pai.v9i1.659

Keywords:

Haemophilus influenzae, neutrophils, opsonization, innate immune response, HL-60 cells

Courtney L. Ferris

Department of Biology, Lakehead University, Thunder Bay, ON, Canada

Marina Ulanova

Department of Biology, Lakehead University; Northern Ontario School of Medicine University, Thunder Bay, ON, Canada

Abstract

Background: The effective elimination of encapsulated bacteria like Haemophilus influenzae type a (Hia) relies on immune mechanisms such as complement-mediated opsonophagocytosis by neutrophils in coordination with opsonization by anti-capsular antibodies. This study evaluated if Hia could activate the immune response through neutrophils and if these responses differed between encapsulated versus unencapsulated or invasive versus non-invasive strains.

Methods: HL-60-derived neutrophil-like cells (dHL-60), differentiated with 1.25% dimethyl sulfoxide over 9 days, were used in an opsonophagocytosis assay and in vitro infection model to measure Hia’s susceptibility to killing and dHL-60 surface molecule expression, respectively. The impact of strain-specific features on the immune response was investigated using clinical isolates of a dominant North American sequence type (ST)-23, including Hia 11-139 (encapsulated, invasive), 14-61 (encapsulated, non-invasive), 13-0074 (unencapsulated, invasive), as well as a representative ST-4 isolate (Hia 13-240, encapsulated, invasive), and a nontypeable strain (NTHi 375, unencapsulated, non-invasive).

Results: Unencapsulated and non-invasive Hi strains were more susceptible to killing by the innate immune response while the ST-23 invasive strain, Hia 11-139 required serum antibodies for destruction. Flow cytometry analysis showed increased expression of co-stimulatory molecule ICAM-1 and Fc receptors (CD89, CD64) but decreased expression of the Fc receptor CD16, revealing potential mechanisms of neutrophil-mediated defense against Hia that extend to both non-invasive and invasive strains.

Conclusions: Hia clinical isolates with diverse pathogenicity illustrated contrasting susceptibility to killing by immune mechanisms while maintaining the same capacity to activate neutrophil-like cells, further underscoring the need for additional studies on Hia’s pathogenesis.

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