Background
Todralazine (hydrochloride) is a β2-adrenergic receptor antagonist with peripheral vasodilator activity. Administration of todralazine (5 uM) to pre-larval zebrafish led to hematopoietic cell expansion and protection from ionizing radiation. It inhibited histone acetylation in vitro and, long-term (4 months), but not short-term (1 month), treatment in mice (3 mg/day) impaired hepatocyte histone acetylation and liver regeneration.
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