Expression of glucose transporter protein-1 (Glut-1) in ocular surface squamous neoplasia

Department of Ophthalmology, Inonu University, Malatia, Malatya, Turkey
Cornea (Impact Factor: 2.36). 08/2007; 26(7):826-30. DOI: 10.1097/ICO.0b013e3180645814
Source: PubMed

ABSTRACT To examine the expression of glucose transporter protein-1 (GLUT-1) in ocular surface squamous neoplasia and to study its relationship with degree of neoplasia and cell proliferation index (Ki-67 labeling index).
Twelve cases diagnosed as ocular surface squamous neoplasia (4 invasive and 8 intraepithelial tumors) at Inonu University Faculty of Medicine, Department of Pathology, were included in this study. There were 3 squamous cell carcinomas, 1 basosquamous cell carcinoma, and 8 conjunctival intraepithelial neoplasms. Immunohistochemically, GLUT-1 and Ki-67 antibody staining were performed.
GLUT-1 membranous immunoreactivity was seen in all tumors except in 1 case. GLUT-1 immunostaining was observed in all layers of the neoplastic epithelium of squamous cell carcinoma. Intense staining for GLUT-1 was determined in the upper two thirds of the severe dysplastic squamous epithelium. Although immunoreactivity for Ki-67 nuclear antigen was present throughout the epithelium, it was higher in the lower two thirds. Ki-67 labeling index ranged between 6% and 80%, and the mean value was 35% for invasive tumors and 20% for intraepithelial tumors.
Marked GLUT-1 and Ki-67 immunoreactive cells throughout the neoplastic epithelium of ocular surface squamous neoplasia were observed. In most cases, it was observed that GLUT-1 expression was severe in cases having >10% Ki-67 labeling index. These findings indicate that glucose uptake was increased in dysplastic cells, especially by GLUT-1. To our knowledge, this is the first study on the subject in the literature, and further studies with more cases are needed with GLUT-1 and other GLUT members.

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    ABSTRACT: PURPOSE: To examine the novel application of a commercially available optical coherence tomography (OCT) system towards molecular histopathology using gold nanorod (GNR) linked antibodies as a functionalized contrast agent to evaluate ocular surface squamous neoplasia (OSSN). METHODS: GNRs were synthesized and covalently attached to anti-glucose transporter-1 (GLUT-1) antibodies via carbodiimide chemistry. Three specimens from each of 3 distinct categories of human conjunctival tissue were selected for analysis, including conjunctiva without epithelial atypia (controls); conjunctival intraepithelial neoplasia: carcinoma in situ (CIS); and conjunctival squamous cell carcinoma (SCC). Tissue sections were incubated initially with GNR tagged anti-GLUT-1 antibodies and then with a fluorescent-tagged secondary antibody. Immunoflourescence and OCT imaging of the tissue was performed and the results were correlated to the light microscopic findings on traditional hemotoxyin and eosin stained sections. RESULTS: No binding of the functionalized GNRs was observed within the epithelium of 3 normal conjunctiva controls. Immunofluorescence disclosed variable binding of the functionalized GNRs to atypical epithelial cells in 6 cases of OSSN. In 2 of 3 cases of SCC, binding of functionalized GNRs was sufficient to produce an increased scattering effect on OCT which correlated to areas of intense staining. Immunofluorescence disclosed strong binding of functionalized GNRs to erythrocytes and areas of hemorrhage within all 9 tested samples. CONCLUSIONS: We have demonstrated the use of OCT for molecular histopathology using functionalized gold nanorods in the setting of OSSN. Our results suggest a threshold concentration of functionalized GNRs within tissue is required to achieve a detectable enhancement in scattering of the OCT signal.
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