The HDAC8 Knockout T-47D Polyclonal Cells are a CRISPR/Cas9-edited polyclonal cell population derived from the T-47D human breast cancer cell line, designed for loss-of-function studies of histone deacetylase 8 (HDAC8). This product provides a heterogeneous knockout model generated through CRISPR/Cas9-mediated gene disruption, enabling investigation of HDAC8-dependent biology in a polyclonal context without single-cell cloning. The polyclonal nature preserves a spectrum of genetic edits while collectively silencing HDAC8 expression, offering a robust tool for functional assays in an ER-positive and progesterone receptor-positive mammary epithelial carcinoma background.
The T-47D host cell line was established from the pleural effusion of a ductal breast carcinoma and is characterized by expression of estrogen receptor (ER) and progesterone receptor (PR). This cell line is widely employed as a model for luminal A breast cancer and is responsive to hormonal stimuli, making it particularly suitable for studying epigenetic regulation in hormone-dependent tumorigenesis. Its well-documented growth requirements and molecular profile provide a physiologically relevant platform for examining HDAC8 function in breast cancer cell proliferation, survival, and response to endocrine therapies.
HDAC8 belongs to the class I histone deacetylase family and catalyzes removal of acetyl groups from lysine residues on histone and non-histone proteins, promoting chromatin compaction and transcriptional repression. Its activity is regulated upstream by PKA-mediated phosphorylation, CREB1, hypoxia, and cyclin-dependent kinases. Key downstream targets include histone H3 (H3K9, H3K14), histone H4 (H4K16), p53 (K120, K382), Hsp70, ERRalpha, SMC3, and cortactin. HDAC8 interacts with SMC3, a core cohesin component, as well as p53, Hsp70, ERRalpha, and cortactin. Through deacetylation, HDAC8 modulates chromatin structure, p53 signaling, heat shock response, nuclear receptor activity, and chromosomal cohesion.
In the context of T-47D cells, disruption of HDAC8 leads to hyperacetylation of its targets, triggering activation of p53 and its downstream effector p21, thereby inducing cell cycle arrest and apoptosis. Additionally, increased acetylation of SMC3 disrupts cohesin function, compromising mitotic fidelity and genomic stability. These molecular alterations are particularly relevant in ER+ breast cancer, where HDAC8 may influence estrogen-responsive gene transcription and crosstalk with nuclear receptor pathways. The knockout model thus provides a critical system for dissecting HDAC8??s role in coordinating epigenetic modifications with tumor-suppressive mechanisms and cohesin-mediated chromosomal architecture in a hormone-sensitive background.
This polyclonal knockout model is applicable in diverse experimental workflows, including western blotting to confirm HDAC8 depletion and to detect hyperacetylation of substrates such as histone H3 and p53, RT-qPCR to quantify transcript levels of p21 and BAX, ChIP-qPCR to map H3K9ac and H3K14ac enrichment, and co-immunoprecipitation to assess SMC3 acetylation status. Proliferation (MTT, BrdU), apoptosis (flow cytometry), and migration/invasion (Boyden chamber) assays can further characterize phenotypic consequences. Additionally, these cells facilitate drug sensitivity screens with selective HDAC8 inhibitors or endocrine therapies like tamoxifen. For comprehensive support, contact Ascent Research.
