By Challenor, Sally
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However, current scientific evidence is inconclusive. There are currently active investigations into treatments for a compromised blood-brain barrier. It is believed that oxidative stress plays an important role into the breakdown of the barrier; anti-oxidants such as lipoic acid may be able to stabilise a weakening blood-brain barrier. Neur om Neurom omyyelitis Optica Neuromyelitis optica, also known as Devic’s disease, is similar and often confused with multiple sclerosis. Among other differences from MS, the target of the autoimmune response has been identified.
These findings have led to hypothesise that (1) breakdown of the blood-brain barrier allows access of neuron-binding autoantibodies and soluble exogenous A 42 to brain neurons and (2) binding of these auto-antibodies to neurons triggers and/or facilitates the internalisation and accumulation of cell surfacebound A 42 in vulnerable neurons through their natural tendency to clear surface-bound auto-antibodies via endocytosis. Eventually the astrocyte is overwhelmed, dies, ruptures, and disintegrates, leaving behind the insoluble A 42 plaque.
Various physiological and pathological factors can also affect drug metabolism. , pharmacogenetics), enterohepatic circulation, nutrition, intestinal flora, or sex differences. In general, drugs are metabolised more slowly in fetal, neonatal and elderly humans and animals than in adults. Genetic variation (polymorphism) accounts for some of the variability in the effect of drugs. With N-acetyltransferases (involved in Phase II reactions), individual variation creates a group of people who acetylate slowly (slow acetylators) and those 36 Biophysics who acetylate quickly, split roughly 50:50 in the population of Canada.
Biological Physics by Challenor, Sally