Elicitation with methyl-jasmonate stimulates peruvoside production in cell suspension cultures of <Emphasis Type="Italic">Thevetia peruviana</Emphasis>

Thevetia peruviana is a small tree that produces several compounds with pharmaceutical application, among which peruvoside could be highlighted. However, these compounds are produced in low concentration in the plant, making it important to develop strategies such as plant cell culture and elicitation to obtain higher quantities of the desired product. In this work, cell suspension cultures of T. peruviana were established in four different culture media: Murashige–Skoog (MS), half Murashige–Skoog (half MS), Schenk–Hildebrandt (SH), and Gamborg (B5) to study their effect on cell growth. Cell growth kinetics were studied in SH medium, and the extracellular peruvoside production during the culture time was determined. The best culture medium for the establishment of cell suspension cultures was MS with a growth index of 3.17 ± 0.2 g g⁻¹ inoculum. The cell growth kinetics showed the four characteristic growth phases of a cell culture (lag, exponential, stationary, and death), and during none of these phases was it possible to observe peruvoside production. The elicitor effect of methyl-jasmonate (MeJ) was studied in cell suspension cultures established in SH medium. The effect of MeJ concentration and the time in which it should be applied were determined. The best results were obtained at a concentration of 100 mg l⁻¹ of MeJ applied at the beginning of the culture, which induced a peruvoside production of 8.93 mg l⁻¹ medium. The current results are the first report of an in vitro peruvoside production system.     

Be in motion . .

Most Apicomplexan are obligate intracellular parasites and at different steps of their life cycle they invade host cells. The invasive forms are generally called zoites and the majority of them largely depend on a unique form of gliding motility to invade cells. Although the parasite intracellular motor complex that drives gliding motility and/or invasion is shared across different parasite stages and species, the extracellular transmembrane adhesins required to recognize and bind host molecules are not only species‐ but also stage‐specific (even if homologues). This is not such a surprise as different parasite stages interact with different hosts or distinct host cells. In this issue, Siden‐Kiamos et al. shows that specificity extends into the parasite cell, affecting how motility is regulated. Why is specificity occurring at this level? And how important is it? These are critical issues that will be hopefully addressed in the near future.