ER and PR in Renomedullary Interstitial Cells During Syrian Hamster Estrogen-Induced Tumorigenesis: Evidence for Receptor-Mediated Oncogenesis
| Autor: | Marilyn Davis, Saravut John Weroha, Jonathan J. Li, Ossama Tawfik, Xiaoying Hou, Sara Antonia Li |
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| Rok vydání: | 2001 |
| Předmět: |
Male
medicine.medical_specialty Kidney Cortex medicine.drug_class Uterus Hamster Biology medicine.disease_cause Endocrinology Cricetinae Internal medicine medicine Animals Estrogen Receptor beta Protein Isoforms Tissue Distribution RNA Messenger Estrogen receptor beta Kidney Medulla Kidney Genome Mesocricetus Estrogen Receptor alpha Aneuploidy biology.organism_classification Kidney Neoplasms medicine.anatomical_structure Receptors Estrogen Estrogen Receptors Progesterone Carcinogenesis Estrogen receptor alpha |
| Zdroj: | Endocrinology. 142:4006-4014 |
| ISSN: | 1945-7170 0013-7227 |
| DOI: | 10.1210/endo.142.9.8355 |
| Popis: | The estrogen-induced and -dependent Syrian hamster renal tumor is the most intensively studied model in estrogen carcinogenesis. Yet, it remains confounding that the kidney of this species behaves as an estrogen target tissue. As both reproductive and urinary systems arise from the same germinal ridge, we propose that some of the germinal cells, normally destined for the uterus, migrate and establish themselves in the renal corticomedullary region in this hamster strain. These ectopically located germinal cells remain dormant unless exposed to estrogen. Supporting this contention, a subset of renal interstitial cells, primarily located in the corticomedullary region, express PR after only 2 wk and ER alpha after 1.5--3.0 months of estrogen treatment. As treatment continues, groups of cells of the renal interstitium and small and large renal tumors show ER alpha(+) and PR(+) staining. Although ER alpha and PR isoform profiles in estrogen-treated hamster kidneys are distinctly different from corresponding uterine patterns, both receptor isoform profiles in primary renal tumors closely resemble those seen in hamster uteri. Renal ER alpha protein and mRNA expression increased after 2.0 and 4.0 months of estrogen treatment and in all renal tumors examined. Using nuclear image cytometry, both early small and large renal tumors were highly aneuploid, indicating that genomic instability is probably a critical early event in estrogen carcinogenesis. |
| Databáze: | OpenAIRE |
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