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OBJECTIVE To identify the role of physiologic magnesium concentrations on the induction of placental apoptosis in vitro and test the anti-apoptotic action of antioxidants. METHODS Placental tissue was obtained from normal pregnancies after cesarean delivery. Placental explants were incubated with increasing concentrations of extracellular magnesium (range(More)
The following evidence, mainly presented here, suggests that IgD receptors play a crucial role in determining the potential for affinity maturation in memory B cell populations. IgD receptors are present on the first memory B cells to appear after priming. These memory cells give rise to more-mature memory cells that have lost their IgD receptors. The(More)
Allotype suppressor T-cell (Ts) populations that persist for the life of the animal arise in (BALB/c x SJL)F(1) hybrids exposed perinatally to antibody to the paternal (Ig-1b) allotype on IgG(2a)-isotype immunoglobulin H chains. These Ts suppress Ig-lb production by depleting the supply of allotype- specific helper T cells (Th) required, in addition to(More)
BACKGROUND Matrix metalloproteinases (MMP) are hypothesized to degrade structurally important components of the laminar extracellular matrix (ECM) in horses with laminitis. OBJECTIVE To compare levels of expression of stromelysin-1 (MMP-3), collagenases (MMP-1, -13), and membrane type-MMPs (MMP-14, -15, -16), and the distribution of their ECM substrates,(More)
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