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Laurence S. Harris, MD; Mitsugu Shimmyo, MD; Thomas W. Mittag, PhD

Arch Ophthalmol. 1974;91(1):57-59.

Abstract
In vivo application of echothiophate iodide to cats' eyes resulted in approximately 70% inhibition of true cholinesterases (ChE) and 15% inhibition of pseudo-ChE in treated eyes. Contralateral untreated eyes, however, showed a similar magnitude of enzymatic inhibition. In both eyes, the acetyl-β-methylcholine bromide (MeCh) dose-response curve showed a 1 log unit increase in sensitivity, whereas the carbachol dose-response curves were unaltered. The latter finding indicates that the sensitivity of cholinergic receptors in this structure is unaltered by echothiophate. Results of the current study showed excellent correlation with previous in vitro studies of cat irides treated with echothiophate. Maximum enzymatic inhibition and shift in the dose-response curves was obtained after one day of treatment with echothiophate.

Author Affiliations
New York

From the Department of Ophthalmology, New York Medical College, New York. Dr. Mittag is now with Mount Sinai Medical School, City University of New York, New York. Dr. Harris is now with New York Hospital, Cornell Medical Center, New York.

Footnotes
Submitted for publication June 7, 1972.

Reprint requests to Department of Ophthalmology, New York Hospital, Cornell Medical Center, 525 E 68th St, New York 10021 (Dr. Harris).

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES

Dose-Response of Cholinergic Agonists on Cat Irides
Harris et al.
Arch Ophthalmol 1974;91:299-302.
ABSTRACT