Characterization of JNK-like protein derived from a mosquito cell line, C6/36


Correspondence: Tetsuya Mizutani, Laboratory of Public Health, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Kita-ku, Kita-18, Nishi-9, Sapporo 060–0818, Japan. Tel./fax: +81 11 706 5213, e-mail:


When Western blot analysis of heat-killed bacteria- and lipopolysaccharide (LPS)-treated Aedes albopictus mosquito cell line C6/36 was performed using antiphospholyrated c-Jun amino-terminal kinase (JNK) antibodies, approximately 46 kDa protein was clearly detected with a peak around 30 min. After the C6/36 cells were incubated at 45 °C in order to induce apoptosis, the 46 kDa protein continued to be detected for at least 3 h. The internalization of fluorescein-labelled bacteria was inhibited by a JNK-specific inhibitor SP600125, suggesting that phagocytosis involves the JNK signalling pathway in mosquito cells. Based on these results, we found one candidate for the nucleotide sequence of JNK (Ae-JNK) from the C6/36 cells. This study is the first report regarding the mitogen-activated protein kinase (MAPK) of mosquito.