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Study finds protein critical to breast cancer cell proliferation, migration
Date:9/15/2011

GALVESTON Researchers have found that a protein linked to cell division and migration and tied to increased cell proliferation in ovarian tumors is also present at high levels in breast cancer specimens and cell lines. The protein, dubbed "UNC-45A," was also determined to be more active in breast cancer cells than in normal breast cells.

University of Texas Medical Branch at Galveston scientists describe these findings and others in a paper now online in the Journal of Molecular Biology.

"As a result of earlier work, we hypothesized that UNC-45A should be critical in several steps related to cancer cell metastasis," said UTMB professor Henry Epstein. "This investigation confirmed that hypothesis, and also showed us significant aspects of UNC-45A's behavior that were previously unknown."

UNC-45A is what is known as a "chaperone" protein, a molecule that helps other proteins function more effectively. In the case of UNC-45A, the protein is myosin, which can be thought of as a tiny machine that interacts with a long, fiber-like protein called actin to alter cell shape and movement. In the last stage of cell division, for example, myosin and actin proteins pinch the cell tightly about its midsection, finally splitting a single cell into two daughter cells.

"What we believe is really important in this paper is that increased UNC-45A in cancer cells leads to enhanced myosin and actin activity, which leads to increased rates of cell proliferation and increased rates of cancer-cell invasion or migration," Epstein said. "Those are critical phenomena and could be significant in the development of new therapeutic approaches."

Epstein's group measured UNC-45A's effect on myosin and actin activity by comparing the activity observed in cells from a highly metastatic cancer cell line with that seen in cells from the same line in which UNC-45A production had been blocked. The difference was substantial, strongly suggestin
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Contact: Jim Kelly
jpkelly@utmb.edu
409-789-4940
University of Texas Medical Branch at Galveston
Source:Eurekalert

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