Mycoplasma removal from cell culture using antimicrobial photodynamic therapy

Akira Hasebe, Isao Ishikawa, Haque M. Shamsul, Makoto Ohtani, Taku Segawa, Ayumi Saeki, Naoho Tanizume, Manabu Oouchi, Yoshihide Okagami, Teruo Okano, Ken Ichiro Shibata

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Objective: The objective of this research was to determine the effectiveness of antimicrobial photodynamic therapy (aPDT) in the removal of mycoplasmas from contaminated cells. Background data: Mycoplasmas often contaminate cell cultures. The cell-contaminating mycoplasmas are removed by antibiotics, but the use of antibiotics usually induces antibiotic-resistant bacteria. aPDT is expected to be a possible alternative to antibiotic treatments for suppressing infections. Materials and Methods: Mycoplasma salivarium (Ms)-infected human embryonic kidney (HEK) 293 cells were irradiated using a red light-emitting diode (LED) in the presence of methylene blue (MB) as a photosensitizer. The Ms viable count was determined using culture on agar plates or using a mycoplasma detection kit. Results: aPDT performed using red LED irradiation was effective in decreasing live Ms in the presence of MB without damaging the HEK293 cells. aPDT removed live Ms from the infected cells after washing the cells with sterilized phosphate-buffered saline (PBS) to decrease the initial number of live Ms before aPDT. Conclusions: This study suggests that aPDT could remove mycoplasmas from contaminated cells.

Original languageEnglish (US)
Pages (from-to)125-131
Number of pages7
JournalPhotomedicine and Laser Surgery
Issue number3
StatePublished - Mar 1 2013

All Science Journal Classification (ASJC) codes

  • Biomedical Engineering
  • Radiology Nuclear Medicine and imaging


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