Clonally expanded γδ T cells protect against Staphylococcus aureus skin reinfection
Carly A. Dillen, … , Emanual Maverakis, Lloyd S. Miller
Carly A. Dillen, … , Emanual Maverakis, Lloyd S. Miller
Published March 1, 2018
Citation Information: J Clin Invest. 2018;128(3):1026-1042. https://doi.org/10.1172/JCI96481.
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Categories: Research Article Immunology Infectious disease

Clonally expanded γδ T cells protect against Staphylococcus aureus skin reinfection

Abstract

The mechanisms that mediate durable protection against Staphylococcus aureus skin reinfections are unclear, as recurrences are common despite high antibody titers and memory T cells. Here, we developed a mouse model of S. aureus skin reinfection to investigate protective memory responses. In contrast with WT mice, IL-1β–deficient mice exhibited poor neutrophil recruitment and bacterial clearance during primary infection that was rescued during secondary S. aureus challenge. The γδ T cells from skin-draining LNs utilized compensatory T cell–intrinsic TLR2/MyD88 signaling to mediate rescue by trafficking and producing TNF and IFN-γ, which restored neutrophil recruitment and promoted bacterial clearance. RNA-sequencing (RNA-seq) of the LNs revealed a clonotypic S. aureus–induced γδ T cell expansion with a complementarity-determining region 3 (CDR3) aa sequence identical to that of invariant Vγ5+ dendritic epidermal T cells. However, this T cell receptor γ (TRG) aa sequence of the dominant CDR3 sequence was generated from multiple gene rearrangements of TRGV5 and TRGV6, indicating clonotypic expansion. TNF- and IFN-γ–producing γδ T cells were also expanded in peripheral blood of IRAK4-deficient humans no longer predisposed to S. aureus skin infections. Thus, clonally expanded γδ T cells represent a mechanism for long-lasting immunity against recurrent S. aureus skin infections.

Authors

Carly A. Dillen, Bret L. Pinsker, Alina I. Marusina, Alexander A. Merleev, Orly N. Farber, Haiyun Liu, Nathan K. Archer, Da B. Lee, Yu Wang, Roger V. Ortines, Steven K. Lee, Mark C. Marchitto, Shuting S. Cai, Alyssa G. Ashbaugh, Larissa S. May, Steven M. Holland, Alexandra F. Freeman, Loren G. Miller, Michael R. Yeaman, Scott I. Simon, Joshua D. Milner, Emanual Maverakis, Lloyd S. Miller

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Figure 4

T cells trafficking from draining LNs mediate the protection.

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T cells trafficking from draining LNs mediate the protection. (A) Time l...
(A) Time line of FTY720 administration with (B) mean total lesion size (cm2) ± SEM and mean total flux (photon/s) ± SEM (n = 10/group). (C) Representative H&E-stained histologic sections at 3 days after S. aureus inoculation. Scale bars: 240 μm. D shows higher magnification of the black boxed area in C. E shows higher magnification of the white boxed area in D (n = 4/group). (F) Mean abscess area (cm2) ± SEM and (G) mean bacterial band width (mm) ± SEM from histologic sections (n = 4/group). (H) Draining LN cells harvested from d28 IL-1β–/– mice and transferred i.v. 1 day prior to 1° S. aureus inoculation of naive IL-1β–/– mice and (I) mean total lesion size (cm2) ± SEM and mean total flux (photon/s) ± SEM (n = 5/group). (J) Time line of anti-CD4 treatment and (K) mean total lesion size (cm2) ± SEM and mean total flux (photon/s) ± SEM (n = 5/group). †P < 0.01, compared with control 1° or 2° mice (B and I) as measured by 2-way ANOVA. Results in B, I, and K are a compilation of 2 independent experiments.