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Plant hormone cytokinins control cell cycle progression and plastid replication in apicomplexan parasites
- Andrabi, Syed Bilal Ahmad, Tahara, Michiru, Matsubara, Ryuma, Toyama, Tomoko, Aonuma, Hiroka, Sakakibara, Hitoshi, Suematsu, Makoto, Tanabe, Kazuyuki, Nozaki, Tomoyoshi, Nagamune, Kisaburo
- Parasitology international 2017
- Plasmodium berghei, Plasmodium falciparum, Toxoplasma gondii, animal pathogens, biochemical pathways, cell cycle, cell proliferation, cyclins, cytokinins, fluorescence microscopy, genes, malaria, parasites, plant hormones, quantitative polymerase chain reaction, rodents, thidiazuron
- Cytokinins are plant hormones that are involved in regulation of cell proliferation, cell cycle progression, and cell and plastid development. Here, we show that the apicomplexan parasites Toxoplasma gondii and Plasmodium berghei, an opportunistic human pathogen and a rodent malaria agent, respectively, produce cytokinins via a biosynthetic pathway similar to that in plants. Cytokinins regulate the growth and cell cycle progression of T. gondii by mediating expression of the cyclin gene TgCYC4. A natural form of cytokinin, trans-zeatin (t-zeatin), upregulated expression of this cyclin, while a synthetic cytokinin, thidiazuron, downregulated its expression. Immunofluorescence microscopy and quantitative PCR analysis showed that t-zeatin increased the genome-copy number of apicoplast, which are non-photosynthetic plastid, in the parasite, while thidiazuron led to their disappearance. Thidiazuron inhibited growth of T. gondii and Plasmodium falciparum, a human malaria parasite, suggesting that thidiazuron has therapeutic potential as an inhibitor of apicomplexan parasites.