protein S100-A2; S100 Ca+2-binding protein A2; protein S-100L; CAN19 (S100A2, S100L)
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Function
- may act as a modulator against excess Ca+2 accumulation in normal human mammary epithelial cells
- may also play a role in suppressing tumor cell growth
- binds 2 Ca+2
Structure
- belongs to the S-100 family
- contains 2 EF-hand domains
Expression
- expressed in a subset of epithelial cells including normal human mammary epithelial cells & keratinocytes
- preferentially expressed in normal human mammary epithelial cells as opposed to tumor-derived ones
- induced by growth factors in early G1 phase & probably by cell-cycle regulation in S phase
- DNA methylation probably plays a direct negative role in suppressing S100L gene expression in tumor cells
Pathology
- levels of S100L correlate inversely with breast cancer progression