Early gene expression analyzed by cDNA microarray and real-time PCR in osteoblasts cultured with chitosan monomer

Tomoko Ganno, Shizuka Yamada, Naoko Ohara, Tsunenori Matsunaga, Kajiro Yanagiguchi, Takeshi Ikeda, Hidetaka Ishizaki, Yoshihiko Hayashi

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Chitosan has a variety of biological activities. Although it has been reported that chitosan promotes osteogenesis in bone lesions, little is known about how it modulates the hard tissue forming cells at the gene level. This study focused on gene expressions in osteoblasts cultured with a super-low concentration of chitosan monomer. cDNA probes were synthesized from isolated RNA and labeled with fluorescent dye. They were hybridized with Human 3.8 II cDNA microarray, and the fluorescent signal was analyzed. cDNA microarray analysis revealed that 10 genes concerning to various signaling-related molecules were expressed at ≥2.0-fold higher signal ratio levels in the experimental group when compared with the control group after 3 days. Real-time PCR analysis showed that chitosan monomer induced an increase in the expression of four signal transduction genes, mitogen-activated protein kinase (MAPK)K3, MAPKKK11, Rac1 and Shc1, together with the alkaline phosphatase gene. These results suggest that a super-low concentration of chitosan monomer could modulate the activity of osteoblastic cells through mRNA levels and that chitosan monomer directly affects signal transduction inside cells.

Original languageEnglish
Pages (from-to)188-194
Number of pages7
JournalJournal of Biomedical Materials Research - Part A
Issue number1
Publication statusPublished - Jul 2007
Externally publishedYes


  • Chitosan monomer
  • Gene expression
  • Osteoblast
  • Real-time PCR
  • cDNA microarray

ASJC Scopus subject areas

  • Ceramics and Composites
  • Biomaterials
  • Biomedical Engineering
  • Metals and Alloys


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