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Surgical sympathetic denervation increases alpha 1-adrenoceptor-mediated accumulation of myo-inositol trisphosphate and muscle contraction in rabbit iris dilator smooth muscle.

Abstract：

:Sympathetic denervation of the iris muscle produces increases in both the breakdown of phosphatidylinositol 4,5-bisphosphate (PIP2) and in muscle contraction in response to norepinephrine (NE). To shed more light on the biochemical basis underlying this supersensitivity we investigated: the effects of NE on PIP2 breakdown, measured as myo-inositol trisphosphate (IP3) accumulation, and on muscle contraction in normal and denervated rabbit iris dilator; and the effects of denervation on selected biochemical properties of this muscle. The data obtained from these studies can be summarized as follows: The EC50 values (microM) for NE-induced IP3 accumulation in normal and denervated dilators were 14 and 3, respectively. This accumulation of IP3 was blocked by prazosin (1 microM). The EC50 values (microM) for NE-induced contraction for the normal and denervated muscles were 10 and 0.6, respectively. The NE-induced muscle contraction was blocked by prazosin (1 microM). The t1/2 values (s) for IP3 accumulation in normal and denervated muscles were 31 and 11, respectively, and for contraction the values were 19 and 9, respectively. Denervation increased significantly (15-18%) the basal labelling of phosphoinositides from myo-[3H]inositol, but not from 32P or [14C]arachidonic acid. Denervation had little effect on the activities of the enzymes involved in phosphoinositide metabolism. However, the activities of protein kinase C and Ca2+-ATPase increased in the denervated muscle. It is concluded that sympathetic denervation of the iris dilator renders the coupling between alpha1 receptors and PIP2 breakdown into IP3 and 1,2-diacylglycerol (DG) more efficient.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

J Neurochem

journal_title

Journal of neurochemistry

authors

Akhtar RA,Abdel-Latif AA

doi

10.1111/j.1471-4159.1986.tb12930.x

subject

Has Abstract

pub_date

1986-01-01 00:00:00

pages

96-104

issue

1

eissn

0022-3042

issn

1471-4159

journal_volume

46

pub_type

杂志文章

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