Astrocytes, known for their role in maintaining CNS homeostasis, are also involved in many pathological conditions. Hypoxia, a common complication of maternal Diabetes Mellitus, is among the traumas alleviated by astrocytes. Zinc maintains a considerable presence in the brain, yet in physiological conditions high zinc concentration poses no threat to proper cell functioning. However, when combined with hypoxic assault, zinc can lead to astrocytic stress and cell death. Two sets of day-18 hippocampal rat primary astrocytes were pre-treated with insulin before adding zinc sulfate; one set was then placed in a hypoxia chamber to compare against the normoxic set. Various laboratory assays to quantify NF-κB and complement component 3 (C3) were used to assess inflammatory stress of the cells. The hypoxic cell sets support a trend of higher insulin levels leading to lower release of the inflammatory markers. Amongst relatively consistent cell viability across all samples, insulin appeared to have a protective role against hypoxic assault, with or without zinc.
Available at: http://works.bepress.com/abigail_hielscher/10/