ERA-90

ERA-90

ERA-90, or Estrogen Receptor Alpha 90, is a specific isoform of the estrogen receptor that plays a crucial role in the regulation of gene expression and cellular function in response to estrogenic signals. Estrogen receptors are a group of proteins found inside cells that are activated by the hormone estrogen (17β-estradiol). The estrogen receptor alpha (ERα) is one of the two main types of estrogen receptors, the other being estrogen receptor beta (ERβ).

Structure and Function

ERA-90 is a variant of the estrogen receptor alpha, characterized by its unique structure that includes a 90 amino acid extension at the N-terminal domain. This extension is thought to influence the receptor's ability to bind to DNA and interact with co-regulatory proteins, thereby modulating its transcriptional activity.

The primary function of ERA-90, like other estrogen receptors, is to act as a transcription factor. Upon binding to estrogen, ERA-90 undergoes a conformational change that allows it to bind to specific DNA sequences known as estrogen response elements (EREs). This binding facilitates the recruitment of coactivators and the transcriptional machinery, leading to the regulation of target gene expression.

Role in Health and Disease

ERA-90 is implicated in various physiological processes, including reproductive function, cardiovascular health, and bone density maintenance. Its role in breast cancer has been extensively studied, as estrogen signaling is a critical driver of the growth of many breast cancers. ERA-90's unique structure may influence the sensitivity of breast cancer cells to endocrine therapies, such as selective estrogen receptor modulators (SERMs) and aromatase inhibitors.

Research and Clinical Implications

Understanding the specific functions and regulatory mechanisms of ERA-90 is crucial for developing targeted therapies for estrogen receptor-positive cancers. Research is ongoing to elucidate the differences between ERA-90 and other isoforms of ERα, which may lead to more precise diagnostic and therapeutic strategies.

Also see

• Estrogen receptor alpha
• Estrogen receptor beta
• Selective estrogen receptor modulator
• Breast cancer
• Hormone therapy