iScience (Aug 2024)

Long-working-distance high-collection-efficiency three-photon microscopy for in vivo long-term imaging of zebrafish and organoids

  • Peng Deng,
  • Shoupei Liu,
  • Yaoguang Zhao,
  • Xinxin Zhang,
  • Yufei Kong,
  • Linlin Liu,
  • Yujie Xiao,
  • Shasha Yang,
  • Jiahao Hu,
  • Jixiong Su,
  • Ang Xuan,
  • Jinhong Xu,
  • Huijuan Li,
  • Xiaoman Su,
  • Jingchuan Wu,
  • Yuli Jiang,
  • Yu Mu,
  • Zhicheng Shao,
  • Cihang Kong,
  • Bo Li

Journal volume & issue
Vol. 27, no. 8
p. 110554

Abstract

Read online

Summary: Zebrafish and organoids, crucial for complex biological studies, necessitate an imaging system with deep tissue penetration, sample protection from environmental interference, and ample operational space. Traditional three-photon microscopy is constrained by short-working-distance objectives and falls short. Our long-working-distance high-collection-efficiency three-photon microscopy (LH-3PM) addresses these challenges, achieving a 58% fluorescence collection efficiency at a 20 mm working distance. LH-3PM significantly outperforms existing three-photon systems equipped with the same long working distance objective, enhancing fluorescence collection and dramatically reducing phototoxicity and photobleaching. These improvements facilitate accurate capture of neuronal activity and an enhanced detection of activity spikes, which are vital for comprehensive, long-term imaging. LH-3PM’s imaging of epileptic zebrafish not only showed sustained neuron activity over an hour but also highlighted increased neural synchronization and spike numbers, marking a notable shift in neural coding mechanisms. This breakthrough paves the way for new explorations of biological phenomena in small model organisms.

Keywords