Early onset of age-related changes in the retina of cystine/glutamate antiporter knockout mice.

To determine the role of the cystine/glutamate antiporter on retinal structure and function, retinas of C57Bl/6J wild-type and xCT knockout mice, lacking the xCT subunit of the cystine/glutamate antiporter were examined from 6 weeks to 12 months of age. Fundoscopy, optical coherence tomography (OCT), and whole mount retinal autofluorescence imaging were used to visualise age-related retinal spots. Glial fibrillary acidic protein (GFAP) immunolabelling was used to assess retinal stress.

Early Onset of Age-Related Cataracts in Cystine/Glutamate Antiporter Knockout Mice.

Purpose: The purpose of this study was to determine the importance of the xCT is a subunit. The cystine/glutamate antiporter is actually system xc-xCT subunit of the cystine/glutamate antiporter in maintaining redox balance by investigating the effects of the loss of xCT on lens transparency and cystine/cysteine balance in the aqueous humour.

Methods: C57Bl/6 wild-type and xCT knockout mice at five age groups (6 weeks to 12 months) were used.

Apparent Hyperthyroidism Caused by Biotin-Like Interference from IgM Anti-Streptavidin Antibodies.

Background: Exclusion of analytical interference is important when there is discrepancy between clinical and laboratory findings. However, interferences on immunoassays are often mistaken as isolated laboratory artefacts. The mechanism of a rare cause of interference in two patients that caused erroneous thyroid function tests, and also affects many other biotin dependent immunoassays, was characterized and reported.

Identification and Functional Characterization of a GSH Conjugate Efflux Pathway in the Rat Lens.

Purpose: To identify and functionally characterize transporters involved in the release of glutathione (GSH) conjugates from the rat lens.

Methods: Polymerase chain reaction and Western blotting were used to screen for the presence of multidrug resistance-associated protein (Mrp) and organic anion transporting polypeptide (Oatp) isoforms, and immunohistochemistry used to localize Mrp isoforms. To test for Mrp function, lenses were loaded with 5-chloromethylfluorescein diacetate and monochlorobimane to form the fluorescent GSH conjugates glutathione methylfluorescein (GS-MF) and glutathione bimane (GS-B), respectively, and cultured in artificial aqueous humour (AAH) in the presence or absence of MK571, an Mrp-specific inhibitor, or benzbromarone, a nonspecific organic anion transporter inhibitor.