Abstract
The expression of class I major histocompatibility complex (MHC) mRNA was compared in the brains of inflammatory susceptible, hypothalamic–pituitary–adrenal (HPA)-axis blunted Lewis rats and inflammatory resistant, HPA-axis hyperresponsive Fischer rats by quantitative in situ hybridization following lipopolysaccharide (LPS) or vehicle administration. Lewis rats showed lower levels of class I MHC in the hypothalamic paraventricular nucleus (PVN) and retrochiasmatic area (RCA) compared to Fischer rats under both vehicle and LPS conditions. No differences were detected in other brain structures. Differential class I MHC expression in Lewis rats suggests an alteration in mechanisms related to cellular activity of neuroendocrine cells rather than alterations specific to neuroendocrine molecules.
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