Age-related changes in esterase activity in rabbit eyes

Vincent H.L. Lee, Robert Stratford Jr., Kim W. Morimoto

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Thus far, the influence of age on the bioavailability of topically applied ophthalmic drugs has been studied by considering age-dependent changes in membrane permeability and protein binding. The specific objective of this research was to determine variation of ocular esterase activity with age and pigmentation of the rabbit. This was achieved by monitoring the fluorescence intensity as a function of time upon incubating ocular tissue homogenates of albino and pigmented rabbits of various age groups with α-naphthyl acetate, both in the presence and absence of esterase inhibitors. In general, esterase activity was the highest in the iris-ciliary body followed by the cornea and then the aqueous humor. Of the age groups studied, peak ocular esterase activity was reached at 6 weeks in the albino rabbit, and beyond 6 weeks in the pigmented rabbit. In the 6-week-old group the albino rabbit exceeded the pigmented rabbit in ocular esterase activity, whereas in the 12-week-old group it was the pigmented rabbit that exceeded the albino rabbit in ocular esterase activity. The conclusion was that in establishing a dosage regimen, age-dependent changes in ocular esterase activity must be considered in conjunction with age-dependent changes in the other factors that also help determine the amount of active drug ultimately reaching its receptor.

Original languageEnglish (US)
Pages (from-to)183-195
Number of pages13
JournalInternational Journal of Pharmaceutics
Volume13
Issue number2
DOIs
StatePublished - Jan 1 1983
Externally publishedYes

Fingerprint

Esterases
Rabbits
Age Groups
Ciliary Body
Aqueous Humor
Pigmentation
Iris
Protein Binding
Pharmaceutical Preparations
Cornea
Biological Availability
Permeability
Membrane Proteins
Fluorescence
Research

ASJC Scopus subject areas

  • Pharmaceutical Science

Cite this

Age-related changes in esterase activity in rabbit eyes. / Lee, Vincent H.L.; Stratford Jr., Robert; Morimoto, Kim W.

In: International Journal of Pharmaceutics, Vol. 13, No. 2, 01.01.1983, p. 183-195.

Research output: Contribution to journalArticle

Lee, Vincent H.L. ; Stratford Jr., Robert ; Morimoto, Kim W. / Age-related changes in esterase activity in rabbit eyes. In: International Journal of Pharmaceutics. 1983 ; Vol. 13, No. 2. pp. 183-195.
@article{73c0ca6b86da492cb8909a55a998ce90,
title = "Age-related changes in esterase activity in rabbit eyes",
abstract = "Thus far, the influence of age on the bioavailability of topically applied ophthalmic drugs has been studied by considering age-dependent changes in membrane permeability and protein binding. The specific objective of this research was to determine variation of ocular esterase activity with age and pigmentation of the rabbit. This was achieved by monitoring the fluorescence intensity as a function of time upon incubating ocular tissue homogenates of albino and pigmented rabbits of various age groups with α-naphthyl acetate, both in the presence and absence of esterase inhibitors. In general, esterase activity was the highest in the iris-ciliary body followed by the cornea and then the aqueous humor. Of the age groups studied, peak ocular esterase activity was reached at 6 weeks in the albino rabbit, and beyond 6 weeks in the pigmented rabbit. In the 6-week-old group the albino rabbit exceeded the pigmented rabbit in ocular esterase activity, whereas in the 12-week-old group it was the pigmented rabbit that exceeded the albino rabbit in ocular esterase activity. The conclusion was that in establishing a dosage regimen, age-dependent changes in ocular esterase activity must be considered in conjunction with age-dependent changes in the other factors that also help determine the amount of active drug ultimately reaching its receptor.",
author = "Lee, {Vincent H.L.} and {Stratford Jr.}, Robert and Morimoto, {Kim W.}",
year = "1983",
month = "1",
day = "1",
doi = "10.1016/0378-5173(83)90005-4",
language = "English (US)",
volume = "13",
pages = "183--195",
journal = "International Journal of Pharmaceutics",
issn = "0378-5173",
publisher = "Elsevier",
number = "2",

}

TY - JOUR

T1 - Age-related changes in esterase activity in rabbit eyes

AU - Lee, Vincent H.L.

AU - Stratford Jr., Robert

AU - Morimoto, Kim W.

PY - 1983/1/1

Y1 - 1983/1/1

N2 - Thus far, the influence of age on the bioavailability of topically applied ophthalmic drugs has been studied by considering age-dependent changes in membrane permeability and protein binding. The specific objective of this research was to determine variation of ocular esterase activity with age and pigmentation of the rabbit. This was achieved by monitoring the fluorescence intensity as a function of time upon incubating ocular tissue homogenates of albino and pigmented rabbits of various age groups with α-naphthyl acetate, both in the presence and absence of esterase inhibitors. In general, esterase activity was the highest in the iris-ciliary body followed by the cornea and then the aqueous humor. Of the age groups studied, peak ocular esterase activity was reached at 6 weeks in the albino rabbit, and beyond 6 weeks in the pigmented rabbit. In the 6-week-old group the albino rabbit exceeded the pigmented rabbit in ocular esterase activity, whereas in the 12-week-old group it was the pigmented rabbit that exceeded the albino rabbit in ocular esterase activity. The conclusion was that in establishing a dosage regimen, age-dependent changes in ocular esterase activity must be considered in conjunction with age-dependent changes in the other factors that also help determine the amount of active drug ultimately reaching its receptor.

AB - Thus far, the influence of age on the bioavailability of topically applied ophthalmic drugs has been studied by considering age-dependent changes in membrane permeability and protein binding. The specific objective of this research was to determine variation of ocular esterase activity with age and pigmentation of the rabbit. This was achieved by monitoring the fluorescence intensity as a function of time upon incubating ocular tissue homogenates of albino and pigmented rabbits of various age groups with α-naphthyl acetate, both in the presence and absence of esterase inhibitors. In general, esterase activity was the highest in the iris-ciliary body followed by the cornea and then the aqueous humor. Of the age groups studied, peak ocular esterase activity was reached at 6 weeks in the albino rabbit, and beyond 6 weeks in the pigmented rabbit. In the 6-week-old group the albino rabbit exceeded the pigmented rabbit in ocular esterase activity, whereas in the 12-week-old group it was the pigmented rabbit that exceeded the albino rabbit in ocular esterase activity. The conclusion was that in establishing a dosage regimen, age-dependent changes in ocular esterase activity must be considered in conjunction with age-dependent changes in the other factors that also help determine the amount of active drug ultimately reaching its receptor.

UR - http://www.scopus.com/inward/record.url?scp=0020702629&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0020702629&partnerID=8YFLogxK

U2 - 10.1016/0378-5173(83)90005-4

DO - 10.1016/0378-5173(83)90005-4

M3 - Article

AN - SCOPUS:0020702629

VL - 13

SP - 183

EP - 195

JO - International Journal of Pharmaceutics

JF - International Journal of Pharmaceutics

SN - 0378-5173

IS - 2

ER -