Haymaker gene expression in malignant and normal gynecologic tissues.
We previously reported that cell lines established from human carcinomas and leukemias/lymphomas expressed high levels of an intracellular membrane-bound protein, Haymaker, whereas cell lines derived from non-malignant connective tissue cells and lymphoid cells expressed low levels of this gene product. To determine whether these findings reflect neoplastic transformation or, alternatively, tissue specificity, we examined by immunohistochemical and molecular methods the expression of Haymaker in gynecologic organs with and without tumor. A highly specific, affinity-purified rabbit polyclonal antibody against a 25-mer Haymaker peptide was used for immunohistochemical staining and morphometric analysis of 85 tissue specimens. Immunohistochemical studies demonstrate, for the first time, that Haymaker protein is highly expressed in epithelial cells of the endometrium of the normal uterus and to a somewhat lesser extent in the mucosa of the normal vagina and cervix, but is poorly expressed or absent in cells of the connective tissue and smooth muscle strata of these organs (p < 0.005). Significant differences in Haymaker expression, as assessed by immunohistochemistry, between malignant and normal gynecologic tissues were not observed (p = 0.27). The expression of Haymaker protein does not appear, therefore, to be a marker of malignant transformation of the epithelium of gynecologic organs but rather distinguishes both normal and malignant epithelial cells from normal connective tissue and smooth muscle cells.
Department of Obstetrics and Gynecology, State University of New York Downstate Medical Center, Brooklyn, New York, USA.
Mark E
ME
Borowsky
Ballabh
B
Das
Constantine A
CA
Axiotis
Edmond S
ES
Malka
Ovadia
O
Abulafia
Allen J
AJ
Norin
D000818:Animals; D000906:Antibodies; D014408:Biomarkers, Tumor / Q000096:biosynthesis*; D002471:Cell Transformation, Neoplastic / Q000378:metabolism; D016889:Endometrial Neoplasms / Q000378:metabolism; D005260:Female; D005833:Genital Neoplasms, Female / Q000378:metabolism*; D005836:Genitalia, Female / Q000378:metabolism*; D006801:Humans; D007150:Immunohistochemistry; D008198:Lymph Nodes / Q000378:metabolism; D018200:Mixed Tumor, Mullerian / Q000378:metabolism; D009363:Neoplasm Proteins / Q000096:biosynthesis* / Q000276:immunology; D009928:Organ Specificity; D010051:Ovarian Neoplasms / Q000378:metabolism; D010053:Ovary / Q000378:metabolism; D011817:Rabbits; D011956:Receptors, Cell Surface / Q000096:biosynthesis* / Q000276:immunology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D002583:Uterine Cervical Neoplasms / Q000378:metabolism; D014594:Uterine Neoplasms / Q000378:metabolism; D014599:Uterus / Q000378:metabolism; D014621:Vagina / Q000378:metabolism
D000906:Antibodies; D014408:Biomarkers, Tumor; C106253:LOC133728 protein, human; D009363:Neoplasm Proteins; D011956:Receptors, Cell Surface