A Cyclin D1-Specific Single-Chain Variable Fragment Antibody that Inhibits HepG2 Cell Growth and Proliferation.
Yan Wu1,2, Weiwei Tang1,3,4, Yuhua Cao1
1Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education, School of Life Sciences, Jilin University, Changchun, 130012, China.
Biotechnology Journal
|March 15, 2020
Summary
Researchers developed an intrabody therapy targeting cyclin D1 to treat liver cancer (HCC). This therapy effectively arrested cancer cell growth and reduced tumor size in preclinical models, showing promise for HCC treatment.
Area of Science:
- Oncology
- Molecular Biology
- Immunotherapy
Background:
- Cyclin D1 is crucial for cell cycle progression and its dysregulation is implicated in hepatocellular carcinoma (HCC).
- Intrabodies offer a novel approach to inhibit intracellular protein function, presenting a potential therapeutic strategy for cancers like HCC.
Purpose of the Study:
- To develop and evaluate an intrabody targeting cyclin D1 for potential HCC therapy.
- To assess the efficacy of the anti-cyclin D1 intrabody (ER-ADκ) in vitro and in vivo.
Main Methods:
- A single-chain variable fragment (scFv) antibody against cyclin D1 (ADκ) was engineered with an ER retention signal (ER-ADκ).
- ER-ADκ was expressed in HepG2 cells and its effects on cell cycle, apoptosis, and downstream signaling were analyzed.
- The therapeutic potential of ER-ADκ was evaluated in human HCC xenografts in nude mice.
Main Results:
- Purified ADκ demonstrated high-affinity binding to cyclin D1.
- ER-ADκ expression in HepG2 cells induced G1 phase arrest and apoptosis, linked to reduced phosphorylated Rb levels.
- ER-ADκ significantly inhibited HCC xenograft tumor growth in vivo.
Conclusions:
- Intrabody-based targeting of cyclin D1 is a feasible and effective strategy.
- ER-ADκ shows significant therapeutic potential for treating hepatocellular carcinoma.
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