Doctor of Philosophy (Ph.D.), Bowling Green State University, 2017, Biological Sciences

Polychlorinated biphenyls (PCBs) are environmental pollutants and endocrine disruptors, harmfully affecting reproductive, endocrine, neurological and immunological systems. This has implications for processes such as wound healing, which is modulated by the immunological response of the body. Conversely, while PCBs can be linked to diminished wound healing, outside of PCB pollution systems, exercise has been shown to accelerate wound healing. However, the potential for moderate intensity exercise to modulate or offset the harmful effects of a toxin like PCB are yet unknown. Exploration of this possible moderation on local immune response was achieved by measuring wound size and analyzing the concentrations of proinflammatory cytokines, 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 previously exercised at moderate intensity by running on a treadmill for 30min/day and then injected intraperitoneally 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) and skin excised from the wound area was homogenized and analyzed for cytokine content. Systemic effects of exercise on immune function in PCB exposed animals were examined by lipopolysaccharide (LPS) challenge (intraperitoneal injections) and analyzed by measuring the average body temperatures using a thermal imaging camera. Wound healing data revealed that in animals not exercised only the greatest dose of PCB (1000 µg/g) showed a pattern for faster wound healing. Exercise produced a pattern of more rapid wound healing rates compared to the animals administerd similar doses, except for animals administered 100 µg/g PCB. Concentrations of pro-inflammatory cytokines revealed patterns t (open full item for complete abstract)

Committee: Lee Meserve Dr. (Advisor); Howard Cromwell Dr. (Other); Todd Keylock Dr. (Committee Member); Scott Rogers Dr. (Committee Member); Vipaporn Phuntumart Dr. (Committee Member) Subjects: Immunology; Kinesiology; Molecular Biology; Physiology; Toxicology