1. Deciphering the Link Between Polychlorinated Biphenyls, Immune Function and Exercise
- Author
-
Pillai, Mahesh Ramachandran
- Subjects
- Immunology, Molecular Biology, Toxicology, Physiology, Kinesiology, Polychlorinated Biphenyls, PCBs, Aroclor 1254, A1254, wound healing, cytokines, local immune response, systemic immune response, wound size, BioPlex assay, lipopolysaccharide, LPS, infrared camera, body temperature, macrophages, plasticity
- Abstract
Polychlorinated biphenyls (PCBs) are environmental pollutants and endocrine disruptors,harmfully affecting reproductive, endocrine, neurological and immunological systems. This hasimplications for processes such as wound healing, which is modulated by the immunologicalresponse of the body. Conversely, while PCBs can be linked to diminished wound healing, outsideof PCB pollution systems, exercise has been shown to accelerate wound healing. However, thepotential for moderate intensity exercise to modulate or offset the harmful effects of a toxin likePCB are yet unknown. Exploration of this possible moderation on local immune response wasachieved by measuring wound size and analyzing the concentrations of proinflammatorycytokines, interleukin-1ß (IL-1ß), interleukin-6 (IL-6), keratinocyte chemoattractant (KC),monocyte chemoattractant protein-1 (MCP-1), and tumor necrosis factor-a (TNF-a) in wounds(inflicted by punch biopsy) in mice that were not exercised as compared with those previouslyexercised at moderate intensity by running on a treadmill for 30min/day and then injectedintraperitoneally with Aroclor 1254 (industrial mixture of PCB congeners) in doses of either 0,100, 500 and 1000 ppm (wt/wt of mice). Mice were euthanized at Day 3 or Day 5 (n = 3-6) andskin excised from the wound area was homogenized and analyzed for cytokine content. Systemiceffects of exercise on immune function in PCB exposed animals were examined bylipopolysaccharide (LPS) challenge (intraperitoneal injections) and analyzed by measuring theaverage body temperatures using a thermal imaging camera. Wound healing data revealed that inanimals not exercised only the greatest dose of PCB (1000 µg/g) showed a pattern for fasterwound healing. Exercise produced a pattern of more rapid wound healing rates compared to theanimals administerd similar doses, except for animals administered 100 µg/g PCB. Concentrationsof pro-inflammatory cytokines revealed patterns that could explain many of the changes observed in the wound healing rates and could be used as a good predictor of progression of wound healing. Average body temperature measurements revealed a febrinergic response to LPS stimulation only in the mice not exercised that were not administered PCB. In exercised mice thisresponse was blunted, indicating lowered inflammatory response. Overall, exercise appears tohave a beneficial effect on wound healing and LPS stimulation, only in animals not administered PCB. Recent studies show both PCB and exercise impair functioning of macrophages and that could have produced the similarity of results in the present study and needs to be further explored.
- Published
- 2017