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Alterations in dendritic cell function in aged mice: potential implications for immunotherapy design

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Abstract

It is known that immune system functions decrease with age, and that adaptive immune responses, especially CD4+ T cell function, seem to be the main affected point in immunity with aging. Dendritic cells (DC) are the major antigen presenting cell (APC), and at least part of the defects observed in adaptive immunity of aged individuals could be due to diminished potential of bone marrow to generate new DC, or defects in DC function. In this study, we investigated if the ability of aged bone marrow (BM) to generate new DC in vitro, as well as aged BM-derived DC responses to lypopolysaccharide (LPS). Because DC are important tools in newly developing anti-tumor therapies, we also studied the ability of aged DC to phagocytose and present antigen from necrotic tumor cells. We found that aged BM generated fewer DC in vitro compared to young BM. While LPS-induced DC maturation is reduced in DC of aged mice, a high TNF-α production is observed in aged DC even without LPS stimulation. While phagocytosis of tumor cells is not affected by age, and DC derived from aged BM show a higher TNF-α production in response to phagocytosis, presentation of tumor antigens was decreased in aged DC. Because class II upregulation in response to phagocytosis was similar between aged and young DC, this could indicate an age associated processing defect in the exogenous pathway. These findings suggest that age of BM used to generate DC does not impair their phagocytic ability or TNF-α production, however leads to a decreased yield in mature DC, reduced response to LPS, and diminished antigen processing/presentation potential. Our results are relevant to optimization DC-based vaccine design for aged populations.

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Abbreviations

APC:

Antigen presenting cells

BM:

Bone marrow

DC:

Dendritic cells

DNA:

Deoxyribonucleotide acid

dNTP:

Triphosphate deoxyribonucleotides

EDTA:

Ethylene diamine tetraacetic acid

ELISA:

Enzyme-linked immunoassay

FITC:

Fluorescein isothiocyanate

IL:

Interleukin

LPS:

Lipopolyssacharide

NO:

Nitric oxide

OVA:

Ovalbumin

PCR:

Polymerase chain reaction

PE:

Phycoerythrin

RFP:

Red fluorescent protein

TBE:

Tris–borate EDTA

TLR:

Toll-like receptor

TNF:

Tumor necrosis factor

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Acknowledgements

This work was supported by FAPERGS and PUCRS. The authors wish to thank Andrea Itano and Marc Jenkins for the EaRFP construct and the YAe antibody producing cells, and Alessandra Peres for assistance in FACS analyses and NO assay. We also thank the members of the Immunology Laboratory, in particular Flavia Ribeiro for discussions and expert technical assistance.

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Correspondence to Cristina Bonorino.

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Paula, C., Motta, A., Schmitz, C. et al. Alterations in dendritic cell function in aged mice: potential implications for immunotherapy design. Biogerontology 10, 13–25 (2009). https://doi.org/10.1007/s10522-008-9150-x

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  • DOI: https://doi.org/10.1007/s10522-008-9150-x

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