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| Down-regulation of the KAI1 metastasis suppressor gene during the progression of human prostatic cancer infrequently involves gene mutation or allelic loss |
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| Author(s): Dong JT, Suzuki H, Pin SS, Bova GS, Schalken JA, Isaacs WB, Barrett JC, Isaacs JT |
| Source: CANCER RESEARCH Volume: 56 Issue: 19 Pages: 4387-4390 Published: OCT 1 1996 |
| Times Cited: 200 References: 16 |
| Abstract: The KAI1 gene, located on human chromosome 11p11.2, suppresses tumor metastasis when expressed in certain cancer cells. To evaluate whether dysregulation of KAI1 occurs during the progression of human prostatic cancer, protein expression, mutation, and allelic loss of KAI1 were analyzed using a tissue bank of 98 primary cancers and 32 metastases. By immunohistochemical staining, high levels of KAI1 protein are detected in the epithelial but not stromal compartment of normal prostatic and benign prostatic hyperplasia tissue. In epithelial cells, KAI1 protein is expressed on the plasma membrane. KAI1 protein expression is downregulated in more than 70% of the 49 primary prostatic cancers from untreated patients. In 10 such untreated patients, down-regulation of KAI1 protein occurred in all of the lymph node metastases examined. In 15 patients with metastatic disease who had failed androgen ablation therapy, more than 90% of the primary prostatic cancers had downregulation, with 60% having no KAI1 protein expression. Primers derived from the sequences flanking each exon of KAI1 were used to analyze KAI1 mutation and allelic loss by the method of PCR-single-strand conformational polymorphism. Using this method, no point mutation or allelic loss was detected in metastases from 10 patients. No allelic loss was detected in an additional 34 primary and 12 lymph node metastases via microsatellite analysis using the marker D11S1344, which is located in the region of KAI1. These results demonstrate that KAI1 protein expression is consistently down-regulated during the progression of human prostatic cancer and that this down-regulation does not commonly involve either mutation or allelic loss of the KAI1 gene. |
| Document Type: Article |
| Language: English |
Addresses:
1. JOHNS HOPKINS UNIV, SCH MED, CTR ONCOL, BALTIMORE, MD 21231 USA
2. JOHNS HOPKINS UNIV, SCH MED, DEPT UROL, BALTIMORE, MD 21231 USA
3. JOHNS HOPKINS UNIV, SCH MED, JAMES BUCHANAN BRADY UROL INST, BALTIMORE, MD 21231 USA
4. JOHNS HOPKINS UNIV, SCH MED, DEPT PATHOL, BALTIMORE, MD 21231 USA
5. UNIV NIJMEGEN, UROL RES LAB, NIJMEGEN, NETHERLANDS
6. NIEHS, RES TRIANGLE PK, NC 27709 USA |
| Publisher: AMER ASSOC CANCER RESEARCH, PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 |
| Subject Category: Oncology |
| IDS Number: VK307 |
| ISSN: 0008-5472 |
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| | | | | | | | | Record from Web of Science® | | | | | | | | | |