Ex vivo expansion of primary cells from limb tissue of Pleurodeles waltl

Abstract

Pleurodeles waltl is coming to light as a model animal, especially in regeneration studies, but deep studies on the molecular mechanisms have been limited due to the absence of primary tissue cells for wide usage. Therefore, we aimed to grow primary cells from limb tissue of P. waltl for in vitro experiments. Limb tissues were cut into small pieces and seeded as “explants” on culture dishes coated with fibronectin and gelatin. Compared to the control without coating, both fibronectin and gelatin supported quicker outgrowth of cells from explants and faster cell adhesion, and fibronectin showed significantly better performance than gelatin. Interestingly, the doubling time of cells on fibronectin‐ and gelatin‐coated surfaces was almost the same (42.39 ± 2.79 h vs. 42.91 ± 3.69 h) and was not significantly different from that on non‐coated plates (49.64 ± 3.63 h). The cryopreserved cells were successfully recovered and showed a multiplication capacity that was similar to that of fresh cells. Senescent cells were barely detected even after long‐term sub‐culture (>15 passages). Moreover, enhanced fluorescence of MitoSOX™ Red in cells under H2O2 exposure confirmed the respondence to chemical stimuli. Collectively, our results show that we are able to grow enough good‐quality cells from P. waltl limb tissue for in vitro experiments, and fibronectin coating provides the best biocompatible environment for cell outgrowth and attachment.

Comparison of hypoxia- and hyperoxia-induced alteration of epigene expression pattern in lungs of Pleurodeles waltl and Mus musculus

“…In conclusion, we found opposite epigene expression patterns in lungs of newts and mice after hypoxia exposure. In the case of newts, the transcription inhibition or metabolic suppression in response to hypoxia might be another excellence of salamanders in addition to regeneration [ 24 , 50 ] and resistance to long-term starvation stress [ 51 ], senescence [ 52 ], and carcinogens [ 20 , 21 ] which are not well developed in adult mice. To make this differential epigene expression pattern clinically translational, further study to elucidate the specific mechanism of action involved in hypoxia tolerance of P .…”