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Ling CC, Sun T, Chen F, Wu H, Tao W, Xie X, Ji D, Gao G, Chen J, Ling Y, Zhang Y. Precise tumor delineation in clinical tissues using a novel acidic tumor microenvironment activatable near-infrared fluorescent contrast agent. Anal Chim Acta 2023; 1279:341815. [PMID: 37827620 DOI: 10.1016/j.aca.2023.341815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 09/04/2023] [Accepted: 09/09/2023] [Indexed: 10/14/2023]
Abstract
Tumor selective near-infrared (NIR) fluorescent contrast agents has the potential to greatly enhance the efficiency and precision of tumor surgery by enabling real-time tumor margin identification for tumor resection guided by imaging. However, the development of these agents is still challenging. In this study, based on the acidic tumor microenvironment (TME), we designed and synthesized a novel pH-sensitive NIR fluorescent contrast agent OBD from β-carboline. The fluorescence quantum yield of OBD exhibited a notable increase at pH 3.6, approximately 12-fold higher compared to its value at pH 7.4. After cellular uptake, OBD lighted up the cancer cells with high specificity and accumulated in the mitochondria. Spraying OBD emitted selective fluorescence in xenograft tumor tissues with tumor-to-normal tissue ratios (TNR) as high as 11.18, implying successful image-guided surgery. Furthermore, OBD was also shown to track metastasis in spray mode. After simple topical spray, OBD rapidly and precisely visualized the tumor margins of clinical colon and liver tissues with TNR over 4.2. Therefore, the small-molecule fluorescent contrast agent OBD has promising clinical applications in tumor identification during surgery.
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Affiliation(s)
- Chang-Chun Ling
- Department of General Surgery and Vascular Surgery, Affiliated Hospital of Nantong University, 226001, Nantong, Jiangsu, PR China.
| | - Tiantian Sun
- Department of General Surgery and Vascular Surgery, Affiliated Hospital of Nantong University, 226001, Nantong, Jiangsu, PR China; School of Pharmacy, Nantong Key Laboratory of Small Molecular Drug Innovation, Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target, Nantong University, 226001 Nantong, Jiangsu, PR China
| | - Fang Chen
- School of Pharmacy, Nantong Key Laboratory of Small Molecular Drug Innovation, Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target, Nantong University, 226001 Nantong, Jiangsu, PR China
| | - Hongmei Wu
- Department of General Surgery and Vascular Surgery, Affiliated Hospital of Nantong University, 226001, Nantong, Jiangsu, PR China; School of Pharmacy, Nantong Key Laboratory of Small Molecular Drug Innovation, Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target, Nantong University, 226001 Nantong, Jiangsu, PR China
| | - Weizhi Tao
- School of Pharmacy, Nantong Key Laboratory of Small Molecular Drug Innovation, Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target, Nantong University, 226001 Nantong, Jiangsu, PR China
| | - Xudong Xie
- School of Pharmacy, Nantong Key Laboratory of Small Molecular Drug Innovation, Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target, Nantong University, 226001 Nantong, Jiangsu, PR China
| | - Dongliang Ji
- School of Pharmacy, Nantong Key Laboratory of Small Molecular Drug Innovation, Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target, Nantong University, 226001 Nantong, Jiangsu, PR China
| | - Ge Gao
- School of Pharmacy, Nantong Key Laboratory of Small Molecular Drug Innovation, Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target, Nantong University, 226001 Nantong, Jiangsu, PR China
| | - Jun Chen
- Department of Hepatobiliary Surgery, Nantong Third People's Hospital and the Third Affiliated Hospital of Nantong University, 226001, Nantong, Jiangsu, PR China
| | - Yong Ling
- Department of General Surgery and Vascular Surgery, Affiliated Hospital of Nantong University, 226001, Nantong, Jiangsu, PR China.
| | - Yanan Zhang
- Department of General Surgery and Vascular Surgery, Affiliated Hospital of Nantong University, 226001, Nantong, Jiangsu, PR China; School of Pharmacy, Nantong Key Laboratory of Small Molecular Drug Innovation, Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target, Nantong University, 226001 Nantong, Jiangsu, PR China.
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