Understanding transcriptional regulation and cellular responses to environmental stress is a major focus in modern molecular and cellular biology. One protein that has gained significant attention in these processes is CITED2 (CBP/p300-interacting transactivator with Glu/Asp-rich carboxy-terminal domain 2). Researchers frequently rely on high-specificity antibodies, such as CITE2 rabbit polyclonal antibody (pAb), to study the expression and biological functions of this transcriptional regulator.

CITED2 antibodies are widely used in Western blotting, ELISA assays, and molecular signaling studies to investigate pathways involved in hypoxia, embryonic development, and transcriptional control. These antibodies allow researchers to detect endogenous CITED2 protein levels and explore its role in gene regulatory networks.

CITED2 is a nuclear transcriptional regulator encoded by the CITED2 gene. The protein contains a glutamic acid/aspartic acid rich C-terminal domain that mediates interactions with transcriptional co-activators and regulatory complexes.

One of the most important molecular interactions of CITED2 occurs with the transcriptional coactivators CREB-binding protein (CBP) and EP300. These coactivators function as histone acetyltransferases that regulate chromatin accessibility and transcriptional activation.

CITED2 acts as a competitive inhibitor of Hypoxia-inducible factor 1-alpha (HIF-1α) transcriptional activity. Under hypoxic conditions, HIF-1α binds to CBP/p300 to activate genes involved in oxygen homeostasis. CITED2 competes for the same binding domain, thereby modulating HIF-dependent transcription.

This regulatory mechanism contributes to the precise control of genes involved in:

1. Cellular adaptation to low oxygen levels
2. Metabolic regulation
3. Angiogenesis
4. Developmental gene expression

CITED2 is primarily localized in the cell nucleus, where it functions as a transcriptional co-regulator. Studies have shown that the protein forms dot-like nuclear structures and frequently colocalizes with EP300 within transcriptional complexes.

The molecular weight of CITED2 is approximately 29 kDa, which is typically detected as a distinct band during Western blot analysis using specific antibodies.

Because of its nuclear localization and interaction with chromatin-modifying enzymes, CITED2 plays an important role in epigenetic regulation of gene expression.

Western Blot Analysis

Western blotting is a fundamental technique used to detect CITED2 protein expression in cell lysates and tissue extracts. Using a rabbit polyclonal antibody targeting the 190–270 amino acid region of CITED2 allows researchers to identify the expected 29 kDa protein band.

Western blot studies involving CITED2 are commonly used in research areas such as:

1. Hypoxia signaling pathways
2. Transcription factor interactions
3. Cancer cell signaling mechanisms
4. Developmental biology studies

ELISA-Based Detection

ELISA assays allow quantitative measurement of CITED2 protein levels in biological samples. Polyclonal antibodies provide high sensitivity due to their ability to recognize multiple epitopes on the target protein.

ELISA applications involving CITED2 antibodies are frequently used for:

1. Protein expression profiling
2. Biomarker research
3. Cellular stress response analysis

CITED2 is essential for normal embryonic development. Genetic studies have demonstrated that mutations or dysregulation of CITED2 can lead to severe developmental abnormalities.

One of the most well-characterized consequences of CITED2 mutation is Congenital heart defects, particularly cardiac septal defects. These abnormalities arise from impaired transcriptional regulation during early heart development.

Beyond developmental biology, CITED2 has also been implicated in several other biological contexts, including:

1. Tumor progression and cancer signaling
2. Stem cell differentiation
3. Metabolic adaptation to hypoxia
4. Epigenetic regulation of gene expression

Reliable detection of transcriptional regulators requires antibodies with high specificity and sensitivity. Polyclonal rabbit antibodies targeting CITED2 are particularly valuable due to their strong affinity for multiple epitopes, which improves signal detection in protein assays.

Key experimental advantages include:

1. Sensitive detection of endogenous CITED2 protein
2. Compatibility with Western blot and ELISA methods
3. Cross-reactivity with human and mouse proteins
4. High stability when stored under recommended conditions

CITED2 is a critical transcriptional regulator that controls gene expression through interactions with CBP/p300 and modulation of hypoxia signaling pathways. Its role in embryonic development, cardiovascular formation, and cellular stress responses has made it a significant focus of molecular biology research.

Using high-quality antibodies such as CITE2 rabbit polyclonal antibody enables researchers to accurately detect CITED2 protein expression and investigate the complex transcriptional networks that regulate cellular physiology.

As research into hypoxia signaling and gene regulation continues to advance, CITED2 antibodies will remain essential reagents for studying the molecular mechanisms underlying development and disease.