This invention provides a method of treating benign prostatic hyperplasia in a subject which comprises administering to the subject a therapeutically effective amount of an .alpha..sub.1C antagonist which (a) binds to a human .alpha..sub.1C adrenergic receptor with a binding affinity greater than 100-fold higher than the binding affinity with which the .alpha..sub.1C antagonist binds to a human .alpha..sub.1A adrenergic receptor, a human .alpha..sub.1B adrenergic receptor, and a human histamine H.sub.1 receptor; and (b) binds to a human .alpha..sub.2 adrenergic receptor with a binding affinity which is greater than 100-fold lower than the binding affinity with which the .alpha..sub.1C antagonist binds to such .alpha..sub.1C adrenergic receptor. The invention further provides a method of inhibiting contraction of a prostate tissue which comprises contacting the prostate tissue with an effective contraction-inhibiting amount of an .alpha..sub.1C antagonist which (a) binds to a human .alpha..sub.1C adrenergic receptor with a binding affinity greater than 100-fold higher than the binding affinity with which the .alpha..sub.1C antagonist binds to a human .alpha..sub.1A adrenergic receptor, a human .alpha..sub.1B adrenergic receptor, and a human histamine H.sub.1 receptor; and (b) binds to a human .alpha..sub.2 adrenergic receptor with a binding affinity which is greater than 100-fold lower than the binding affinity with which the .alpha..sub.1C antagonist binds to such .alpha..sub.1C adrenergic receptor.
该发明提供了一种治疗良性前列腺增生的方法,该方法包括向受试者施用治疗有效量的α1C受体拮抗剂,该拮抗剂(a)与人类α1C
肾上腺素受体结合的亲和力比其与人类α1A
肾上腺素受体、人类α1B
肾上腺素受体和人类
组织胺H1受体结合的亲和力高100倍以上;以及(b)与人类α2
肾上腺素受体结合的亲和力比其与该α1C
肾上腺素受体结合的亲和力低100倍以上。该发明还提供了一种抑制前列腺组织收缩的方法,该方法包括将前列腺组织与有效的抑制收缩量的α1C受体拮抗剂接触,该拮抗剂(a)与人类α1C
肾上腺素受体结合的亲和力比其与人类α1A
肾上腺素受体、人类α1B
肾上腺素受体和人类
组织胺H1受体结合的亲和力高100倍以上;以及(b)与人类α2
肾上腺素受体结合的亲和力比其与该α1C
肾上腺素受体结合的亲和力低100倍以上。