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Saini R, Rao C, Maji A, Mishra PM, Yadav A, Nandi CK, Ghosh K. Design and synthesis of novel palladium cyclometallate-based fluorescent probe: Studies on interaction with cell membrane by confocal and fluorescence lifetime imaging. J Inorg Biochem 2022; 237:112019. [PMID: 36244311 DOI: 10.1016/j.jinorgbio.2022.112019] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2022] [Revised: 09/27/2022] [Accepted: 09/29/2022] [Indexed: 11/07/2022]
Abstract
Coordination complexes offer great potential as cellular imaging probes, which allow to examine specific cell organelle structures in their physiological conditions to better understand the biological system. Understanding the heterogeneous nature of the cell membrane could unveil details of their functionality. Here, we have developed a new anthracene conjugated fluorescent palladium(II) cyclometallate [PdL1Cl] where L1H = [2-(2- (anthracen-9-ylmethylene)-1-phenylhydrazineyl)pyridine] (H stands for dissociable proton), which not only specifically stains the cell membrane, but could be utilized to visualise the membrane by the confocal and fluorescence lifetime imaging microscopy (FLIM). This probe is unable to enter inside the cell as it did not pass through the cell membrane via diffusion or various organic and metal transporters. However, the great lipophilicity of fluorescein improves the interaction of the probe with the peptidoglycan layer of the cell membrane. Probable dissociation of chloride ion and formation of positively charged palladium complex resulted in staining the negatively charged cell membrane. The 3D confocal imaging clearly expressed sole membrane staining by the probe. The probe efficiently stains both cancer cells (HeLa and MCF-7 cell lines) and normal cell (HEK 293 T), confirming the universality of the probe in membrane staining.
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Affiliation(s)
- Rahul Saini
- Department of Chemistry and Department of BioScience and BioEngineering, Indian Institute of Technology, Roorkee, Roorkee 247667, Uttarakhand, India
| | - Chethana Rao
- School of Basic Sciences, Indian Institute of Technology, Mandi, Himachal Pradesh 175005, India; Advanced Materials Research Centre, Indian Institute of Technology, Mandi, Himachal Pradesh 175005, India
| | - Ankur Maji
- Department of Chemistry and Department of BioScience and BioEngineering, Indian Institute of Technology, Roorkee, Roorkee 247667, Uttarakhand, India
| | - Pushpendra M Mishra
- School of Basic Sciences, Indian Institute of Technology, Mandi, Himachal Pradesh 175005, India; Advanced Materials Research Centre, Indian Institute of Technology, Mandi, Himachal Pradesh 175005, India; BioX centre, Indian Institute of Technology, Mandi, Himachal Pradesh 175005, India
| | - Aditya Yadav
- School of Basic Sciences, Indian Institute of Technology, Mandi, Himachal Pradesh 175005, India; Advanced Materials Research Centre, Indian Institute of Technology, Mandi, Himachal Pradesh 175005, India
| | - Chayan K Nandi
- School of Basic Sciences, Indian Institute of Technology, Mandi, Himachal Pradesh 175005, India; Advanced Materials Research Centre, Indian Institute of Technology, Mandi, Himachal Pradesh 175005, India; BioX centre, Indian Institute of Technology, Mandi, Himachal Pradesh 175005, India
| | - Kaushik Ghosh
- Department of Chemistry and Department of BioScience and BioEngineering, Indian Institute of Technology, Roorkee, Roorkee 247667, Uttarakhand, India.
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