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Fan L, Jiang Z, Xiong Y, Xu Z, Yang X, Gu D, Ainiwaer M, Li L, Liu J, Chen F. Recent Advances in the HPPH-Based Third-Generation Photodynamic Agents in Biomedical Applications. Int J Mol Sci 2023; 24:17404. [PMID: 38139233 PMCID: PMC10743769 DOI: 10.3390/ijms242417404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Revised: 12/05/2023] [Accepted: 12/10/2023] [Indexed: 12/24/2023] Open
Abstract
Photodynamic therapy has emerged as a recognized anti-tumor treatment involving three fundamental elements: photosensitizers, light, and reactive oxygen species. Enhancing the effectiveness of photosensitizers remains the primary avenue for improving the biological therapeutic outcomes of PDT. Through three generations of development, HPPH is a 2-(1-hexyloxyethyl)-2-devinyl derivative of pyropheophorbide-α, representing a second-generation photosensitizer already undergoing clinical trials for various tumors. The evolution toward third-generation photosensitizers based on HPPH involves structural modifications for multimodal applications and the combination of multifunctional compounds, leading to improved imaging localization and superior anti-tumor effects. While research into third-generation HPPH is beneficial for advancing PDT treatment, equal attention should also be directed toward the other two essential elements and personalized diagnosis and treatment methodologies.
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Affiliation(s)
- Lixiao Fan
- Department of Otolaryngology-Head and Neck Surgery, West China Hospital, Sichuan University, Chengdu 610064, China; (L.F.); (Z.J.); (Y.X.); (X.Y.); (D.G.); (M.A.); (L.L.)
- Head and Neck Surgical Center, West China Hospital, Sichuan University, Chengdu 610064, China
| | - Zheng Jiang
- Department of Otolaryngology-Head and Neck Surgery, West China Hospital, Sichuan University, Chengdu 610064, China; (L.F.); (Z.J.); (Y.X.); (X.Y.); (D.G.); (M.A.); (L.L.)
- Head and Neck Surgical Center, West China Hospital, Sichuan University, Chengdu 610064, China
| | - Yu Xiong
- Department of Otolaryngology-Head and Neck Surgery, West China Hospital, Sichuan University, Chengdu 610064, China; (L.F.); (Z.J.); (Y.X.); (X.Y.); (D.G.); (M.A.); (L.L.)
- Head and Neck Surgical Center, West China Hospital, Sichuan University, Chengdu 610064, China
| | - Zepeng Xu
- West China Clinical Medical College, Sichuan University, Chengdu 610064, China;
| | - Xin Yang
- Department of Otolaryngology-Head and Neck Surgery, West China Hospital, Sichuan University, Chengdu 610064, China; (L.F.); (Z.J.); (Y.X.); (X.Y.); (D.G.); (M.A.); (L.L.)
- Head and Neck Surgical Center, West China Hospital, Sichuan University, Chengdu 610064, China
| | - Deying Gu
- Department of Otolaryngology-Head and Neck Surgery, West China Hospital, Sichuan University, Chengdu 610064, China; (L.F.); (Z.J.); (Y.X.); (X.Y.); (D.G.); (M.A.); (L.L.)
- Head and Neck Surgical Center, West China Hospital, Sichuan University, Chengdu 610064, China
| | - Mailudan Ainiwaer
- Department of Otolaryngology-Head and Neck Surgery, West China Hospital, Sichuan University, Chengdu 610064, China; (L.F.); (Z.J.); (Y.X.); (X.Y.); (D.G.); (M.A.); (L.L.)
- Head and Neck Surgical Center, West China Hospital, Sichuan University, Chengdu 610064, China
| | - Leyu Li
- Department of Otolaryngology-Head and Neck Surgery, West China Hospital, Sichuan University, Chengdu 610064, China; (L.F.); (Z.J.); (Y.X.); (X.Y.); (D.G.); (M.A.); (L.L.)
- Head and Neck Surgical Center, West China Hospital, Sichuan University, Chengdu 610064, China
| | - Jun Liu
- Department of Otolaryngology-Head and Neck Surgery, West China Hospital, Sichuan University, Chengdu 610064, China; (L.F.); (Z.J.); (Y.X.); (X.Y.); (D.G.); (M.A.); (L.L.)
- Head and Neck Surgical Center, West China Hospital, Sichuan University, Chengdu 610064, China
| | - Fei Chen
- Department of Otolaryngology-Head and Neck Surgery, West China Hospital, Sichuan University, Chengdu 610064, China; (L.F.); (Z.J.); (Y.X.); (X.Y.); (D.G.); (M.A.); (L.L.)
- Head and Neck Surgical Center, West China Hospital, Sichuan University, Chengdu 610064, China
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Mathematical modelling for antimicrobial photodynamic therapy mediated by 5-aminolaevulinic acid: An in vitro study. Photodiagnosis Photodyn Ther 2022; 40:103116. [PMID: 36100198 DOI: 10.1016/j.pdpdt.2022.103116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Revised: 09/09/2022] [Accepted: 09/09/2022] [Indexed: 12/14/2022]
Abstract
BACKGROUND Antimicrobial photodynamic therapy (aPDT) using aminolaevulinic acid (ALA) is a promising alternative to antibiotic therapy. ALA administration induces protoporphyrin IX (PpIX) accumulation in bacteria, and light excitation of the accumulated PpIX generates singlet oxygen to bacterial toxicity. Several factors, including drug administration and light irradiation conditions, contribute to the antibiotic effect. Such multiple parameters should be determined moderately for effective aPDT in clinical practice. METHODS A mathematical model to predict bacterial dynamics in ALA-aPDT following clinical conditions was constructed. Applying a pharmacokineticspharmacodynamics (PK-PD) approach, which is widely used in antimicrobial drug evaluation, viable bacteria count by defining the bactericidal rate as the concentration of singlet oxygen produced when PpIX in bacteria is irradiated by light. RESULTS The in vitro experimental results of ALA-aPDT for Pseudomonas aeruginosa demonstrated the PK-PD model validity. The killing rate has an upper limit, and the lower power density for a long irradiation time can suppress the viable bacteria number when the light dosages are the same. CONCLUSIONS This study proposed a model of bacterial viability change in ALA-aPDT based on the PK-PD model and confirmed, by in vitro experiments using PA, that the variation of bacterial viability with light-sensitive substance concentration and light irradiation power densities could be expressed. Further validation of the PK-PD model with other gram negative and gram positive strains will be needed.
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