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M9640550.TXT
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1996-03-04
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Document 0550
DOCN M9640550
TI Lens hydration in transgenic mice containing HIV-1 protease linked to
the lens alpha A-crystallin promoter.
DT 9604
AU Bettelheim FA; Zeng FF; Bia Y; Tumminia SJ; Russell P; Chemistry
Department, Adelphi University, Garden City, New York; 11530, USA.
SO Arch Biochem Biophys. 1995 Dec 20;324(2):223-7. Unique Identifier :
AIDSLINE MED/96132649
AB Two constructs of transgenic mice, TG61 and TG72, containing HIV-1
protease linked to lens alpha A-crystallin promoter develop cataract.
The TG61 construct exhibits cataractogenesis in utero, while in the TG72
construct frank opacities appear 24 days (homozygotes) and 26 days
(hemizygotes) after birth. Differential scanning calorimetry and
thermogravimetric analysis studies indicate that the hydration of lenses
is strongly correlated with cataractogenesis. In all clear lenses
(normal and precataractous) the total water content was the same, 68%,
and increased upon opacification. The bound water, measured as
percentage nonfreezable water of the total water, decreased upon
cataract formation, indicating a syneretic process. On the other hand,
the bound water expressed as grams of nonfreezable water per gram dry
weight increases upon opacification. This implies that proteolysis and
subsequent enhanced hydration is the primary supramolecular event in
cataractogenesis and that syneresis in the lens of transgenic mice is of
secondary importance.
DE Animal Calorimetry, Differential Scanning Cataract/*ETIOLOGY
Crystallins/GENETICS Gene Expression Heterozygote Homozygote HIV
Protease/GENETICS/*METABOLISM Lens, Crystalline/EMBRYOLOGY/*METABOLISM
Mice Mice, Transgenic Promoter Regions (Genetics) Recombinant Fusion
Proteins/METABOLISM Support, U.S. Gov't, P.H.S. Water/*METABOLISM
JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).