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1 Renal Section, Boston Medical Center, Boston University School of Medicine, Boston 02118; and 2 Renal Division, Brigham and Women's Hospital, Harvard Institutes of Medicine, Boston, Massachusetts 02115
Acute
renal failure (ARF) due to
ischemic1 or toxic renal
injury, a clinical syndrome traditionally referred to as acute tubular necrosis (ATN), is a common disease with a high overall mortality of
~50%. Little progress has been made since the advent of dialysis more than 30 years ago in improving this outcome. During this same
period, a considerable amount of basic research has been devoted to
elucidating the pathophysiology of ATN. The ultimate goal of this
research is to facilitate the development of therapeutic interventions
that either prevent ARF, ameliorate the severity of tubular injury
following an acute ischemic or toxic renal insult, or accelerate the
recovery of established ATN. This research endeavor has been highly
successful in elucidating many vascular and tubular abnormalities that
are likely to be involved in ischemic and toxic ARF. This information
has led to impressive advances in the development of a number of
different pharmacological interventions that are highly effective in
ameliorating the renal dysfunction in animal models of ARF. Although
these developments are exciting and promising, enthusiasm of
investigators involved in this endeavor has been tempered somewhat by
the results of a few recent clinical studies of patients with ATN.
These trials, designed to examine the efficacy in humans of some of the
interventions effective in animal models of ARF, have resulted in
little or no benefit. This is therefore an important time to reevaluate
the approaches we have taken over the past three to four decades to
develop new and effective treatments for ATN in humans. The major goals
of this review are 1) to evaluate the relevance and utility of
the experimental models currently available to study ischemic and toxic
renal injury, 2) to suggest novel experimental approaches and
models that have the potential to provide advantages over methods
currently available, 3) to discuss ways of integrating results
obtained from different experimental models of acute renal injury and
of evaluating the relevance of these findings to ATN in humans, and
4) to discuss the difficulties inherent in clinical studies of
ATN and to suggest how studies should be best designed to overcome
these problems.
acute tubular necrosis; ischemia; nephrotoxins; renal artery occlusion; cultured cells; isolated proximal tubules
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