2. Academic Validation
  3. Chlorophyllides repress gain-of-function p53 mutated HNSCC cell proliferation via activation of p73 and repression of p53 aggregation in vitro and in vivo

Chlorophyllides repress gain-of-function p53 mutated HNSCC cell proliferation via activation of p73 and repression of p53 aggregation in vitro and in vivo

  • Biochim Biophys Acta Mol Basis Dis. 2025 Mar;1871(3):167662. doi: 10.1016/j.bbadis.2025.167662.
Bi-He Cai 1,  Yi-Ting Wang 2,  Chia-Chi Chen 3,  Fang-Yu Yeh 4,  Yu-Rou Lin 4,  Ying-Chen Lin 5,  Tze-You Wu 6,  Kuan-Yo Wu 2,  Ching-Feng Lien 7,  Yu-Chen Shih 8,  Jei-Fu Shaw 9
Affiliations

Affiliations

  • 1 School of Medicine, I-Shou University, Kaohsiung City 82445, Taiwan. Electronic address: bigbiha@isu.edu.tw.
  • 2 Department of Medical Science and Biotechnology, I-Shou University, Kaohsiung City 82445, Taiwan.
  • 3 School of Medicine, I-Shou University, Kaohsiung City 82445, Taiwan; Department of Pathology, E-Da Hospital, Kaohsiung City 82445, Taiwan.
  • 4 School of Medicine, I-Shou University, Kaohsiung City 82445, Taiwan.
  • 5 Department of Medical Laboratory Science, I-Shou University, Kaohsiung City 82445, Taiwan.
  • 6 Department of Biomedical Engineering, I-Shou University, Kaohsiung City 82445, Taiwan.
  • 7 Department of Otolaryngology-Head and Neck Surgery, E-Da Hospital, Kaohsiung City 82445, Taiwan.
  • 8 Department of Otolaryngology-Head and Neck Surgery, E-Da Hospital, Kaohsiung City 82445, Taiwan. Electronic address: ed109324@edah.org.tw.
  • 9 Department of Medical Science and Biotechnology, I-Shou University, Kaohsiung City 82445, Taiwan. Electronic address: shawjf@isu.edu.tw.
PMID: 39788216 DOI: 10.1016/j.bbadis.2025.167662
Abstract

Head and neck squamous cell carcinoma (HNSCC) cells have a high p53 mutation rate, but there were rare reported about the p53 gain of function through the prion-like aggregated form in p53 mutated HNSCC cells. Thioflavin T (ThT) is used to stain prion-like proteins in cells. Previously, we found that ThT and p53 staining were co-localized in HNSCC cells (Detroit 562 cells) with homozygous p53 R175H mutation. NAMPT Inhibitor can repress ThT staining in Detroit 562 cells. In our previous study, co-treatment with p73 activator NSC59984 and NAMPT Inhibitor FK886 synergistically repressed Detroit 562 cell proliferation. In this study, we found that two heterozygous p53-R280T mutation HNSCC cell lines, TW01 and HONE-1, also have the ThT staining signal. Treatment with chlorophyllides and p73 activator or NAMPT Inhibitor did not synergistically repress cell proliferation in either Detroit 562 or HONE-1 cells. Chlorophyllides reduced the ThT aggregation signal in both Detroit 562 and HONE-1 cells. Chlorophyllides also induced p73 and Caspase 3/7 expression and repressed NAMPT expression in both Detroit 562 and HONE-1 cells. Chlorophyllides reduced tumor size in vivo in Detroit 562 cells injected into a xenograft nude mice model, but this in vivo tumor repression effect was not found in p73 knockdown Detroit 562 cells. Moreover, NAMPT was repressed by chlorophyllides independent of p73 status in vivo. We thus concluded that chlorophyllides have a dual Anticancer function when applied to HNSCC cells with p53 gain-of-function mutation, via activation of p73 and repression of p53 aggregation.

Keywords

Aggregation; Chlorophyllides; Gain of function mutation; HNSCC; p53; p73.

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