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Departments of Pediatrics [S. D. W., R. H. L., D. W. F., V. F., B. A. K.] and Pharmacology [B. A. K.], University of Texas Southwestern Medical Center, Dallas, Texas 75235, and Cancer Research Division, Centocor, Malvern, Pennsylvania 19355 [L. R. C., V. R. Z.]
In some epithelial cells studied in vitro a membrane-bound folate receptor initiates the process for cell accumulation of 5-methyltetrahydrofolic acid. This receptor was found to be GP38, an overexpressed, glycosyl-phosphatidylinositol anchored glycoprotein, recognized by two monoclonal antibodies, designated MOv18 and MOv19. Using immunoblotting with MOv19, radioimmunoassay with MOv18 and 19, Northern blot analysis, and radioligand binding when possible, we describe the limited expression of the folate receptor in a large number of normal tissues from four autopsies. The immunoblot technique detected as little as 40 pg (
1 fmol) of receptor protein. Choroid plexus consistently had the largest amount of folate receptor. Other tissues containing substantial amounts of receptor included lung, thyroid, and kidney. The liver, intestines, muscle, cerebellum, cerebrum, and spinal cord were immunologically nonreactive. Folate receptor gene expression determined by Northern blot analysis confirmed these observations. We also show that several malignant cell lines express significantly more receptor than normal epithelial cells or fibroblasts. Specifically, malignant cells bound
20 pmol [3H]folate/106 cells, while normal epithelial cells and fibroblasts bound
1 pmol radioligand/106 cells. We also demonstrate that 4 of 6 brain tumors overexpress the folate receptor. These studies reveal the limited normal tissue distribution of the folate receptor, a cell surface protein which may be a useful immunological or pharmacological target for the development of selective cancer therapy.
1 Supported by NIH Grant 1RO1-CA52625 and ACS CH-228F. S. D. W. and D. F. were supported by National Cancer Institute Fellowship Training Grant 5T32-CA09640-02. B. A. K. is a Burroughs-Wellcome Scholar in Pharmacology.
2 To whom requests for reprints should be addressed, at Department of Pediatrics, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75235.
Received 1/10/92. Accepted 4/ 6/92.
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