Expression of Human papillomavirus type 52 L1 capsid gene in Oryza sativa involved in cytoprotective activities


  • Kuan-Hung LIN Chinese Culture University, Department of Horticulture and Biotechnology, Taipei 11114 (TW)
  • Shwu-Fen PAN Ming Chuan University, Department of Biotechnology, Taoyuan 333 (TW)
  • Chiu-Chen CHEN Ming Chuan University, Department of Biotechnology, Taoyuan 333 (TW)
  • Wen-Shian LI Ming Chuan University, Department of Biotechnology, Taoyuan 333 (TW)
  • Chih-Ming CHIANG Ming Chuan University, Department of Biotechnology, Taoyuan 333 (TW)



cervical cancer; Human papillomavirus; Oryza sativa; plant vaccine; type 52 L1 capsid protein


Female cervical cancer is largely formed by Human papillomavirus (HPV), the second leading cause of cancer deaths in women worldwide. HPV-52 is a regionally common high-risk type of cervical cancer found mostly in Asia and reveals geographical variations, in order of importance, as types HPV-16 and -18. However, the differing propensities of HPV types in progressing to cancer, focusing on HPV-52 vaccines, are limited. Several plant-based vaccines against cancer have been developed, and the production of candidate HPV therapeutic vaccines using plant-derived expression platforms is also proven. The objectives of this study were to assess the HPV-52L1 Capsid gene by transferring HPV-52L1 Capsid cDNA into rice (Oryza sativa L.) via an Agrobacterium-mediated transformation, and accumulating HPV-52L1 Capsid proteins in a plant-based expression system to maintain and improve antigenicity. Crude protein extracts containing 5~20 μg from OsHP-52L1 transgenic lines induced cell death and significantly reduced cell proliferation in HPV-positive HeLa cervical cancer cells compared with those non-transformant (NT) rice plants. However, no significant cytotoxicity of induced human breast MDA-MB-231 cell proliferation (as negative control) was observed at any dose compared with NT groups. HeLa cells ameliorated the effects of OsHPV crude protein extracts on cell viability as the extract concentration increased, and treatment with 20 μg of the extract from OsHPV-3 significantly reduced cell viability in HeLa cells (26%) compared with the control group (57%). Our results can be used for exploring the potential of plants for increasing the immunogenicity of OsHPV-52L1 Capsid DNA vaccines, and support the development of cost-effective HPV vaccines, which is highly desirable for resource-poor countries.


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How to Cite

LIN, K.-H., PAN, S.-F., CHEN, C.-C., LI, W.-S., & CHIANG, C.-M. (2020). Expression of Human papillomavirus type 52 L1 capsid gene in Oryza sativa involved in cytoprotective activities. Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 48(1), 40–52.



Research Articles
DOI: 10.15835/nbha48111750

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