Uncoupling of attenuated myo-(3H)inositol uptake and dysfunction in Na(+)-K(+)-ATPase pumping activity in hypergalactosemic cultured bovine lens epithelial cells

Journal Article · Sat Jun 01 00:00:00 EDT 1991 · Diabetes; (United States)

DOI:https://doi.org/10.2337/diabetes.40.6.731· OSTI ID:5396781

Cammarata, P R; Tse, D; Yorio, T ^[1]

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1. Department of Anatomy, Texas College of Osteopathic Medicine/University of North Texas, Fort Worth (USA)

Attenuation of both the active transport of myo-inositol and Na(+)-K(+)-ATPase pumping activity has been implicated in the onset of sugar cataract and other diabetic complications in cell culture and animal models of the disease. Cultured bovine lens epithelial cells (BLECs) maintained in galactose-free Eagle's minimal essential medium (MEM) or 40 mM galactose with and without sorbinil for up to 5 days were examined to determine the temporal effects of hypergalactosemia on Na(+)-K(+)-ATPase and myo-inositol uptake. The Na(+)-K(+)-ATPase pumping activity after 5 days of continuous exposure to galactose did not change, as demonstrated by 86Rb uptake. The uptake of myo-(3H)inositol was lowered after 20 h of incubation in galactose and remained below that of the control throughout the 5-day exposure period. The coadministration of sorbinil to the galactose medium normalized the myo-(3H)inositol uptake. No significant difference in the rates of passive efflux of myo-(3H)inositol or 86Rb from preloaded galactose-treated and control cultures was observed. Culture-media reversal studies were also carried out to determine whether the galactose-induced dysfunction in myo-inositol uptake could be corrected. BLECs were incubated in galactose for 5 days, then changed to galactose-free physiological medium with and without sorbinil for a 1-day recovery period. myo-Inositol uptake was reduced to 34% of control after 6 days of continuous exposure to galactose. Within 24 h of media reversal, myo-inositol uptake returned to or exceeded control values in BLECs switched to either MEM or MEM with sorbinil.2+ reversible and occurred independently of changes in Na(+)-K(+)-ATPase pumping activity in cultured lens epithelium, indicating that the two parameters are not strictly associated and that the deficit in myo-inositol uptake occurs rapidly during hypergalactosemia.

• OSTI ID: 5396781
• Journal Information: Diabetes; (United States), Vol. 40:6; ISSN 0012-1797
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
ATP-ASE
MEMBRANE TRANSPORT
DIABETES MELLITUS
PATHOGENESIS
GALACTOSE
BIOCHEMICAL REACTION KINETICS
INOSITOL
CATTLE
CRYSTALLINE LENS
EPITHELIUM
IMIDAZOLES
IN VITRO
RUBIDIUM 86
TRACER TECHNIQUES
TRITIUM COMPOUNDS
ACID ANHYDRASES
ALDEHYDES
ANIMAL TISSUES
ANIMALS
AZOLES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BODY
BODY AREAS
CARBOHYDRATES
DAYS LIVING RADIOISOTOPES
DISEASES
DOMESTIC ANIMALS
ELECTRON CAPTURE RADIOISOTOPES
ENDOCRINE DISEASES
ENZYMES
EYES
FACE
HEAD
HETEROCYCLIC COMPOUNDS
HEXOSES
HYDROGEN COMPOUNDS
HYDROLASES
INOSITOLS
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
KINETICS
MAMMALS
METABOLIC DISEASES
MINUTES LIVING RADIOISOTOPES
MONOSACCHARIDES
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANS
PHOSPHOHYDROLASES
RADIOISOTOPES
REACTION KINETICS
RUBIDIUM ISOTOP
RUMINANTS
SACCHARIDES
SENSE ORGANS
TISSUES
VERTEBRATES
550901* - Pathology- Tracer Techniques