Nanoquantification of RUNX2 by a 1,1'-carbonyldiimidazole-diamond mediated sandwich assay for osteogenic
Qingshan Sun1, Wei Zhu2, Endong Shi1
1Department of Bone Surgery, The Third Hospital of Shandong Province, Jinan, Shandong, 250031, China.
Abstract:
Adipose tissue-derived stem cells (ADSCs) possess the capability to modulate the immune response and alleviate inflammation, rendering them a promising therapeutic option for various conditions, including autoimmune diseases, cardiovascular diseases, and tissue injuries. The osteogenic differentiation in ADSCs plays a pivotal role in fracture healing, bone growth, and the overall bone turnover process, governed by intricate interactions. Runt-related Transcription Factor 2 (RUNX2) is a key player in mineralized tissue generation and is typically found in the early stages of osteogenic differentiation. The objective of this study was to develop a high-affinity sandwich biosensor for the quantification of RUNX2. 1,1'-Carbonyldiimidazole-modified nanodiamond was immobilized on an amine-modified interdigitated electrode surface, followed by the use of a capture antibody to facilitate antigen interaction. A sandwich assay was conducted with the antibody, and the limit of detection for RUNX2 was calculated as 0.1 ng/mL, with a regression value (R2) of 0.9914 over a linear range of 1-2000 ng/mL. Furthermore, biofouling experiments with a nonimmune antibody, BSA, and TNF-α did not yield any current responses, indicating the specific detection of RUNX2. Additionally, RUNX2-spiked serum exhibited an increasing current response at all concentrations, confirming the selective detection of RUNX2.
Insights
Researchers developed a sensitive biosensor to detect Runt-related Transcription Factor 2 (RUNX2), a key protein in bone formation. This tool aids in quantifying RUNX2, crucial for understanding bone healing and related diseases.
Area of Science:
- Biotechnology
- Biomedical Engineering
- Stem Cell Biology
Background:
- Adipose tissue-derived stem cells (ADSCs) show therapeutic potential in immune modulation and tissue repair.
- Osteogenic differentiation of ADSCs is vital for bone healing and turnover, with Runt-related Transcription Factor 2 (RUNX2) being a critical early regulator.
Purpose of the Study:
- To develop a high-affinity sandwich biosensor for precise quantification of RUNX2.
- To establish a reliable method for detecting RUNX2 in biological samples.
Main Methods:
- Immobilization of 1,1'-Carbonyldiimidazole-modified nanodiamond on an amine-modified interdigitated electrode.
- Development of a sandwich assay utilizing a capture antibody for RUNX2 detection.
- Evaluation of biosensor specificity using nonimmune antibodies, BSA, and TNF-α.
Main Results:
- The developed biosensor achieved a limit of detection of 0.1 ng/mL for RUNX2 with high linearity (R² = 0.9914) over a range of 1-2000 ng/mL.
- Demonstrated high specificity for RUNX2, with no response observed for biofouling agents like BSA and TNF-α.
- Confirmed selective RUNX2 detection in spiked serum samples, showing a concentration-dependent current response.
Conclusions:
- A novel, highly specific, and sensitive sandwich biosensor for RUNX2 quantification has been successfully developed.
- This biosensor platform holds promise for applications in diagnostics and research related to bone metabolism and osteogenic differentiation.
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