Stem cell antigen-1 (Sca-1) (Sca-1)

Stem cell antigen-1 (Sca-1), primarily known as Lymphocyte antigen 6A (Ly6A), is a glycosylphosphatidylinositol (GPI)-anchored cell surface protein belonging to the Ly6 family. It is a critical marker in murine research, used extensively to identify and enrich hematopoietic stem cells (HSCs) and other tissue-resident progenitors. Beyond its function as a biomarker, Sca-1 regulates biological processes such as cell self-renewal, proliferation, and differentiation by participating in lipid raft-associated signaling complexes. In pathological contexts, Sca-1/LY6A is often overexpressed in various cancers, including mammary and pituitary tumors, where it promotes tumor migration and stemness. While traditionally associated with mice, the discovery of a human candidate ortholog (LY6A) has increased its relevance as a potential therapeutic target in human oncology. Drugs like histone deacetylase inhibitors (HDACis) and interferons are known to modulate its expression, offering avenues for manipulating stem cell outcomes or immune responses.

Other names

Lymphocyte antigen 6ALy6ALy-6A/ELy6ET-cell-activating protein (TAP)Thymic shared antigen 1 (TSA-1)Stem cell antigen-2

Upregulation of Sca-1 expression through histone deacetylase (HDAC) inhibition or IFN/Stat1 signaling; targeted modulation using monoclonal antibodies for research or diagnostic isolation.