Abstract:
:Glucose uptake and metabolism are essential for proliferation and survival of cells, and are supposed to be enhanced in actively proliferating cell systems such as embryonic and cancer tissues. Glucose uptake is usually carried out through glucose transporters. In the developing fetal lung, metabolism of glucose is thought to be an important process in cell proliferation, differentiation and maturation. Active glucose uptake could result in accumulation of glycogen in epithelial cells, and utilization of glycogen could be a critical phenomenon for lung epithelial development. In hamsters, although facilitative glucose transporter isoform 1 (GLUT1) and isoform 4 (GLUT4) are not detected in adult lungs, expression of them is detected with immunohistochemical and Western blot analyses in the developing fetal lungs. In human lung carcinomas, GLUT1 expression is seen in most cases of lung carcinoma, and is seen especially frequently in squamous cell carcinoma. GLUT1 expression in adenocarcinoma of the lung is correlated with reduced cell differentiation, larger tumor size and positive lymph node metastasis. A few cases of lung carcinoma show positive staining for GLUT3 and GLUT4. Thus, expression of some facilitative glucose transporter isoforms is detected in developing fetal epithelium and in lung carcinomas. Overexpression of them could enhance uptake of glucose into these cells, and the increased influx of glucose could be involved in active cell proliferation, which is a common character of the developing lung epithelium and carcinoma.
journal_name
Histol Histopatholjournal_title
Histology and histopathologyauthors
Ito T,Noguchi Y,Udaka N,Kitamura H,Satoh Sdoi
10.14670/HH-14.895subject
Has Abstractpub_date
1999-07-01 00:00:00pages
895-904issue
3eissn
0213-3911issn
1699-5848journal_volume
14pub_type
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