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Near-infrared Transillumination and Photodynamic Therapy Using Hypericin in Animal Laryngeal Tumors
Tissue Engineering and Regenerative Medicine ; (6): 941-951, 2021.
Article in English | WPRIM | ID: wpr-919365
ABSTRACT
BACKGROUND@#We aimed to validate a pilot study of photodiagnosis using near infrared (NIR) transillumination and assess the clinical efficacy of hypericin-mediated photodynamic therapy (HYP-PDT) in a rabbit laryngeal cancer model in order to develop a novel therapeutic modality with complete remission and preservation of the functional organ. @*METHODS@#(1) In vitro study VX tumor cells were subcultured and subjected to HYP-PDT. (2) In vivo study A laryngeal cancer model was developed in which 12 rabbits were inoculated with a VX tumor suspension in the submucosal area of the left vocal fold using a transoral approach. All rabbits underwent NIR transillumination using light with a wavelength of 780 nm. The survival periods of the three treatment groups (6 rabbits in Group A HYP-PDT, 3 each in Groups B and C laser irradiation or HYP administration only) were analyzed. @*RESULTS@#The higher the HYP concentration, the lower the VX cell viability in response to HYP-PDT using 590 nm LED. Following HYP-PDT, small tumors in Group A-1 rabbits healed completely and the animals demonstrated a long survival period, and larger tumors in Group A-2 healed partially with a survival period that extended over 3 weeks after inoculation. The survival of Groups B and C were not different over the first 3 weeks of the study, and were shorter than in Group A. @*CONCLUSION@#We found HYP-PDT could be a curative therapy for early-stage cancers that may also preserve organ function, and may inhibit tumor progression and metastasis during advanced stages of laryngeal cancer.
Full text: Available Index: WPRIM (Western Pacific) Language: English Journal: Tissue Engineering and Regenerative Medicine Year: 2021 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Language: English Journal: Tissue Engineering and Regenerative Medicine Year: 2021 Type: Article