Biomaterial Database

Transient elevation of aldose reductase mRNA in lens of rats developing galactose cataracts. 1992

S Shi, and N J Unakar, and Y Wen, and J Tsui, and I Bekhor

Laboratory for Molecular Genetics, Doheny Eye Institute, Los Angeles, California.

Aldose reductase (AR), a major enzyme in the polyol pathway, is thought to be responsible for accumulation of polyols in lenses exposed to high doses of galactose or glucose, and it may be linked to some of the complications found in diabetes. In this report we examined the level of expression of AR mRNA in lens epithelia undergoing development of galactose cataracts in vivo. The AR mRNA was quantitated by Northern blot hybridization with a [35S]-RNA transcript from a previously described AR cDNA clone. This was done on normal lens epithelia and on epithelia from lens of rats fed a diet of Purina Chow containing 50% galactose for periods of from 6 hr to 20 days. We found AR mRNA to elevate to about 5-fold the control levels by 12-24 hr on galactose, then decrease to the control levels by day 4. The increase in AR mRNA appears to be transitory. The high abundance in AR mRNA by 24 hr on galactose was confirmed by in situ hybridization. At later periods, from 8 to 20 days on galactose, a slow increase in AR mRNA took effect, as we have previously reported. Changes in the levels of galactose and dulcitol between 0 and 96 hr were also quantitated by gas chromatography, showing that there was a significant increase in both galactose and dulcitol occurring throughout the experimental period.(ABSTRACT TRUNCATED AT 250 WORDS)

UI	MeSH Term	Description	Entries
D007908	Lens, Crystalline	A transparent, biconvex structure of the EYE, enclosed in a capsule and situated behind the IRIS and in front of the vitreous humor (VITREOUS BODY). It is slightly overlapped at its margin by the ciliary processes. Adaptation by the CILIARY BODY is crucial for OCULAR ACCOMMODATION.	Eye Lens,Lens, Eye,Crystalline Lens
D002386	Cataract	Partial or complete opacity on or in the lens or capsule of one or both eyes, impairing vision or causing blindness. The many kinds of cataract are classified by their morphology (size, shape, location) or etiology (cause and time of occurrence). (Dorland, 27th ed)	Cataract, Membranous,Lens Opacities,Pseudoaphakia,Cataracts,Cataracts, Membranous,Lens Opacity,Membranous Cataract,Membranous Cataracts,Opacities, Lens,Opacity, Lens,Pseudoaphakias
D003459	Crystallins	A heterogeneous family of water-soluble structural proteins found in cells of the vertebrate lens. The presence of these proteins accounts for the transparency of the lens. The family is composed of four major groups, alpha, beta, gamma, and delta, and several minor groups, which are classed on the basis of size, charge, immunological properties, and vertebrate source. Alpha, beta, and delta crystallins occur in avian and reptilian lenses, while alpha, beta, and gamma crystallins occur in all other lenses.	Lens Proteins,Crystallin,Eye Lens Protein,Lens Protein, Eye,Protein, Eye Lens,Proteins, Lens
D004790	Enzyme Induction	An increase in the rate of synthesis of an enzyme due to the presence of an inducer which acts to derepress the gene responsible for enzyme synthesis.	Induction, Enzyme
D004848	Epithelium	The layers of EPITHELIAL CELLS which cover the inner and outer surfaces of the cutaneous, mucus, and serous tissues and glands of the body.	Mesothelium,Epithelial Tissue,Mesothelial Tissue,Epithelial Tissues,Mesothelial Tissues,Tissue, Epithelial,Tissue, Mesothelial,Tissues, Epithelial,Tissues, Mesothelial
D005136	Eye Proteins	PROTEINS derived from TISSUES of the EYE.	Proteins, Eye
D005260	Female		Females
D005690	Galactose	An aldohexose that occurs naturally in the D-form in lactose, cerebrosides, gangliosides, and mucoproteins. Deficiency of galactosyl-1-phosphate uridyltransferase (GALACTOSE-1-PHOSPHATE URIDYL-TRANSFERASE DEFICIENCY DISEASE) causes an error in galactose metabolism called GALACTOSEMIA, resulting in elevations of galactose in the blood.	D-Galactose,Galactopyranose,Galactopyranoside,D Galactose
D005693	Galactosemias	A group of inherited enzyme deficiencies which feature elevations of GALACTOSE in the blood. This condition may be associated with deficiencies of GALACTOKINASE; UDPGLUCOSE-HEXOSE-1-PHOSPHATE URIDYLYLTRANSFERASE; or UDPGLUCOSE 4-EPIMERASE. The classic form is caused by UDPglucose-Hexose-1-Phosphate Uridylyltransferase deficiency, and presents in infancy with FAILURE TO THRIVE; VOMITING; and INTRACRANIAL HYPERTENSION. Affected individuals also may develop MENTAL RETARDATION; JAUNDICE; hepatosplenomegaly; ovarian failure (PRIMARY OVARIAN INSUFFICIENCY); and cataracts. (From Menkes, Textbook of Child Neurology, 5th ed, pp61-3)	Galactokinase Deficiency Disease,Galactose-1-Phosphate Uridyl-Transferase Deficiency Disease,UDPglucose 4-Epimerase Deficiency Disease,Classic Galactosemia,Deficiency Disease, Galactokinase,Deficiency Disease, Galactose-1-Phosphate Uridyl-Transferase,Deficiency Disease, UDP-Galactose-4-Epimerase,Deficiency Disease, UDPglucose 4-Epimerase,Epimerase Deficiency Galactosemia,GALE Deficiency,GALK Deficiency,GALT Deficiency,Galactokinase Deficiency,Galactose Epimerase Deficiency,Galactose-1-Phosphate Uridyltransferase Deficiency,Galactose-1-Phosphate Uridylyltransferase Deficiency,Galactosemia,Galactosemia 2,Galactosemia 3,Galactosemia III,Galactosemia, Classic,Hereditary Galactokinase Deficiency,UDP-Galactose-4-Epimerase Deficiency,UDP-Galactose-4-Epimerase Deficiency Disease,UDPGlucose Hexose-1-Phosphate Uridylyltransferase Deficiency,UTP Hexose-1-Phosphate Uridylyltransferase Deficiency,UTP-Hexose-1-Phosphate Uridylyltransferase Deficiency Disease,Classic Galactosemias,Deficiencies, GALE,Deficiencies, GALK,Deficiencies, GALT,Deficiencies, Galactokinase,Deficiencies, Galactose Epimerase,Deficiencies, Galactose-1-Phosphate Uridyltransferase,Deficiencies, Galactose-1-Phosphate Uridylyltransferase,Deficiencies, Hereditary Galactokinase,Deficiencies, UDP-Galactose-4-Epimerase,Deficiency Disease, Galactose 1 Phosphate Uridyl Transferase,Deficiency Disease, UDP Galactose 4 Epimerase,Deficiency Disease, UDPglucose 4 Epimerase,Deficiency Diseases, UDP-Galactose-4-Epimerase,Deficiency Galactosemia, Epimerase,Deficiency Galactosemias, Epimerase,Deficiency, GALE,Deficiency, GALK,Deficiency, GALT,Deficiency, Galactokinase,Deficiency, Galactose Epimerase,Deficiency, Galactose-1-Phosphate Uridyltransferase,Deficiency, Galactose-1-Phosphate Uridylyltransferase,Deficiency, Hereditary Galactokinase,Deficiency, UDP-Galactose-4-Epimerase,Epimerase Deficiency Galactosemias,GALE Deficiencies,GALK Deficiencies,GALT Deficiencies,Galactokinase Deficiencies,Galactokinase Deficiencies, Hereditary,Galactokinase Deficiency Diseases,Galactokinase Deficiency, Hereditary,Galactose 1 Phosphate Uridyl Transferase Deficiency Disease,Galactose 1 Phosphate Uridyltransferase Deficiency,Galactose 1 Phosphate Uridylyltransferase Deficiency,Galactose Epimerase Deficiencies,Galactose-1-Phosphate Uridyltransferase Deficiencies,Galactose-1-Phosphate Uridylyltransferase Deficiencies,Galactosemia 2s,Galactosemia 3s,Galactosemia IIIs,Galactosemia, Epimerase Deficiency,Galactosemias, Classic,Galactosemias, Epimerase Deficiency,Hereditary Galactokinase Deficiencies,UDP Galactose 4 Epimerase Deficiency,UDP Galactose 4 Epimerase Deficiency Disease,UDP-Galactose-4-Epimerase Deficiencies,UDP-Galactose-4-Epimerase Deficiency Diseases,UDPGlucose Hexose 1 Phosphate Uridylyltransferase Deficiency,UDPglucose 4 Epimerase Deficiency Disease,UTP Hexose 1 Phosphate Uridylyltransferase Deficiency,UTP Hexose 1 Phosphate Uridylyltransferase Deficiency Disease,Uridyltransferase Deficiencies, Galactose-1-Phosphate,Uridyltransferase Deficiency, Galactose-1-Phosphate,Uridylyltransferase Deficiencies, Galactose-1-Phosphate,Uridylyltransferase Deficiency, Galactose-1-Phosphate
D000449	Aldehyde Reductase	An enzyme that catalyzes reversibly the oxidation of an aldose to an alditol. It possesses broad specificity for many aldoses. EC 1.1.1.21.	Aldose Reductase,Aldose Reductase Ia,Aldose Reductase Ib,Erythrose Reductase,Xylose Reductase,Reductase Ia, Aldose,Reductase Ib, Aldose,Reductase, Aldehyde,Reductase, Aldose,Reductase, Erythrose,Reductase, Xylose