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Department of Human Biology and Nutritional Sciences, University of Guelph, Guelph, ON, Canada N1G 2W1
2To whom correspondence should be addressed. E-mail: wwoodwar{at}uoguelph.ca.
The objective of this investigation was to determine the influence of wasting protein and/or energy deficits on the capacity of dendritic cells to initiate primary responses. Weanling male and female C57BL/6J mice were permitted free access to a complete purified diet, free access to an isocaloric low protein purified diet (combined deficiencies of protein and energy) or restricted intake of the complete diet (energy deficiency) for up to 14 d; a 19-d-old zero-time control group was also included. Malnourished mice lost 1.5–2% of initial body weight daily. Antigen presentation by dendritic cells from spleen and lymph nodes was assessed in vitro by the primary one-way allogeneic mixed lymphocyte reaction using CBA/J mononuclear or CD4+ T cells as responders. This function was sustained despite advanced weight loss and, remarkably, was increased in cell suspensions from 14-d energy-deficient mice. Antigen presentation by dendritic cells in mononuclear suspensions was examined in vivo using the host-vs.-graft response in CBA/J recipients, and an ontogeny-related increase was sustained in both malnourished groups through 14 d of weight loss. Neither wasting protocol influenced the proportion of mononuclear cells (1–2%) exhibiting dendritic cell phenotype (CD11c+F4/80-/low) in the cellular suspensions used to study antigen-presenting activity. Consequently, these functional studies are interpretable on a per dendritic cell basis. In the absence of infectious or inflammatory pressure, the dendritic cell retains antigen-presenting capacity despite acute (wasting) deficiencies of protein and/or energy. The results are relevant to presentation of both foreign (adjuvant role) and self (tolerizing role) antigens by the dendritic cell.
KEY WORDS: • antigen presentation • dendritic cell • energy deficiency • protein deficiency • mice
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