Neuroactive steroids

Endogenous allopregnanolone has a role in the physiology of diverse behavioral functions, and dysregulation of allopregnanolone has been implicated in various neurologic and psychiatric conditions (Schüle et al., 2011 ). In particular, changes in allopregnanolone levels may play a role in the fluctuations in seizure susceptibility that occur in catamenial epilepsy, in response to stress, and in other clinical situations (Reddy & Rogawski, 2012 ). In addition, allopregnanolone has neuroprotective properties (Borowicz et al., 2011 ), for example, in models of traumatic brain injury (Djebaili et al., 2005 ) and stroke (Sayeed et al., 2006 ). Of particular relevance here is the ability of allopregnanolone to attenuate neuronal damage in the hippocampus following kainic acid treatment (Leśkiewicz et al., 1997 ; Ciriza et al., 2004 ). Although the neuroprotection observed in this situation could be caused by antiseizure effects, it is noteworthy that in non–seizure-related brain injury, benzodiazepines may not confer neuroprotective effects as is obtained with neuroactive steroids in such brain injury models (Kuhmonen et al., 2002 ; Davies et al., 2004 ). Therefore, allopregnanolone may have unique neuroprotective properties not shared by other GABA A receptor PAMs. In sum, allopregnanolone may confer benefit in the treatment of status epilepticus by stopping seizures and also conceivably by protecting against seizure-induced neural injury.

Amiloride works by directly blocking the epithelial sodium channel (ENaC) thereby inhibiting sodium reabsorption in the late distal convoluted tubules , connecting tubules, and collecting ducts in the nephron . [8] This promotes the loss of sodium and water from the body, but without depleting potassium . The drug is often used in conjunction with a thiazide diuretic to counteract the potassium-sparing effect. Due to its potassium-sparing capacities, hyperkalemia can occur. The risk of developing hyperkalemia is increased in patients who are also on ACE inhibitors , angiotensin II receptor antagonists , other potassium-sparing diuretics , or any potassium-containing supplements.

Neuroactive steroids

neuroactive steroids


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