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Studies of tissue regeneration and host-pathogen interactions using the model planarian  Schmidtea mediterranea  have been performed at an experimental temperature of 19 °C.  S. mediterranea  planarians exposed to 19 °C–32 °C were observed for survival, mobility, feeding and regeneration for three months and elimination of the  Staphylococcus aureus  pathogen over six days.  S. mediterranea  planarians died at 30 °C–32 °C after 18 days of observation but tolerated temperatures of 19 °C up to 28 °C with non-significant differences in mobility and feeding behavior. Genetic malleability tested by RNAi feeding was still efficient at 26 °C and 28 °C. Concerning the immune capacity of planarians, we reported an exacerbation of the immune response in worms infected by  S. aureus  at 26 °C and 28 °C. These observations suggest a temperature modulation of planarian stem cells and illustrate the importance of modulating experimental temperature when using planarians as model organisms to study regeneration and immune response.

Temperature affects the biology of Schmidtea mediterranea