Volume 35, Issue 2, Pages (October 2015)

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Volume 35, Issue 2, Pages 236-246 (October 2015) Absence of Radial Spokes in Mouse Node Cilia Is Required for Rotational Movement but Confers Ultrastructural Instability as a Trade-Off  Kyosuke Shinohara, Duanduan Chen, Tomoki Nishida, Kazuyo Misaki, Shigenobu Yonemura, Hiroshi Hamada  Developmental Cell  Volume 35, Issue 2, Pages 236-246 (October 2015) DOI: 10.1016/j.devcel.2015.10.001 Copyright © 2015 Elsevier Inc. Terms and Conditions

Developmental Cell 2015 35, 236-246DOI: (10.1016/j.devcel.2015.10.001) Copyright © 2015 Elsevier Inc. Terms and Conditions

Figure 1 Taxol Randomizes the Rotation of Node Cilia (A–F) Motion pattern of node cilia at various times after the onset of culture of mouse embryos in a medium containing a DMSO (0.1%) vehicle (A–C) or 5 μM Taxol (D–F) at 37°C. L and R denote the left and right sides of the embryo, respectively. White lines demarcate the node cavity. Red, blue, and green dots indicate cilia rotating in clockwise, those rotating in random directions, and those manifesting planar beating, respectively. (G and H) Traces of ciliary tips engaged in stable clockwise rotation (G) or random rotation (H). (I) Summary of the ciliary motion pattern in the node cavity of mouse embryos 1 hr after culture onset in the presence of DMSO or Taxol. Red, blue, and green bars denote the percentages of cilia manifesting the different motion patterns indicated in (A). White size bars represent 10 μm (A–F) or 5 μm (G and H). A minor population (less than 1%) of node cilia shows random rotation in WT mouse embryos. Developmental Cell 2015 35, 236-246DOI: (10.1016/j.devcel.2015.10.001) Copyright © 2015 Elsevier Inc. Terms and Conditions

Figure 2 Disorganized Arrangement of Doublet Microtubules in Node Cilia of Taxol-Treated Embryos (A–C) TEM of cross-sections of node cilia in mouse embryos treated with DMSO (A) or 5 μM Taxol for 30 min (B and C). Whereas a regular circular arrangement of nine doublet microtubules was apparent in control embryos, the arrangement of doublet microtubules was disorganized (although dynein arms were retained) in Taxol-treated embryos. Red arrowheads indicate doublet microtubules that have undergone transposition. (D–K) Electron tomography of doublet microtubules in node cilia of embryos cultured with DMSO for 30 min (D and E, blue panels) or with 5 μM Taxol for 10 min (F and G, green panels) or 30 min (H–K, red panels). Doublet microtubules that are present in the normal position, that shift their position from the periphery to the center of the axoneme, or that remain at the center of the axoneme within the region of observation are shown in blue, red, and yellow, respectively. The lower panels show the arrangement of doublet microtubules at the base, middle, and tip of the axoneme. Black and the white size bars represent 50 nm (A–C) and 0.2 μm (D, F, H, and J), respectively. See also Figures S1–S3. Developmental Cell 2015 35, 236-246DOI: (10.1016/j.devcel.2015.10.001) Copyright © 2015 Elsevier Inc. Terms and Conditions

Figure 3 Computer Simulation of the Motion of Node Cilia (A) Work flow of the computer simulation. A mesh framework of doublet microtubules was designed based on experimental data obtained by electron tomography. The dynein arm-driven deformation of the axoneme was calculated with a finite element method. (B–F) Traces of ciliary tip motion. Ciliary motion was calculated for embryos treated with DMSO for 30 min (B) or with 5 μM Taxol for 10 min (C and D) or 30 min (E and F). Typical cross-sections of the axoneme showing interdoublet distances are presented. Colored doublet microtubules correspond to the electron tomography data in Figure 2. (G) TEM of an outer dynein arm of a node cilium showing the presence of two heads. The arrow indicates the length of the outer dynein arm. Red size bar represents 20 nm. See also Figures S2 and S3. Developmental Cell 2015 35, 236-246DOI: (10.1016/j.devcel.2015.10.001) Copyright © 2015 Elsevier Inc. Terms and Conditions

Figure 4 Taxol Does Not Affect the Motion or Arrangement of Doublet Microtubules in Airway Cilia (A and B) Motion of cilia in mouse airway tissue cultured for 2 hr with DMSO (A) or 5 μM Taxol (B). Taxol-treated cilia maintained planar beating similar to that apparent for DMSO-treated cilia. (C) Summary of the motion pattern of airway cilia. Green bars denote the percentage of cilia showing planar beating. (D and E) TEM of cross-sections of airway cilia in tissue cultured as in (A) and (B). Taxol-treated cilia maintained a regular circular arrangement of doublet microtubules similar to that of DMSO-treated cilia. (F) Summary of the organization of doublet microtubules. Red bars denote the percentage of cilia with a regular arrangement of doublet microtubules. White and black size bars indicate 5 μm (A and B) and 50 nm (D and E), respectively. Developmental Cell 2015 35, 236-246DOI: (10.1016/j.devcel.2015.10.001) Copyright © 2015 Elsevier Inc. Terms and Conditions

Figure 5 Typical Ultrastructure of Airway Cilia in WT and Rsph4a Knockout Mice (A and B) Motion of node cilia in WT (A) and Rsph4a−/− (knockout, or KO) (B) mouse embryos. The clockwise rotation of node cilia was retained in the Rsph4a−/− mouse embryo. (C–F) TEM of cross-sections of airway cilia in WT (C and D) and Rsph4a−/− (E and F) mice. The radial spoke head of the cilia apparent in WT mice (D, solid arrow) was missing from Rsph4a−/− mice (F, dotted arrow). White, black, and red size bars indicate 20 μm (A and B), 50 nm (C and E), and 20 nm (D and F), respectively. Developmental Cell 2015 35, 236-246DOI: (10.1016/j.devcel.2015.10.001) Copyright © 2015 Elsevier Inc. Terms and Conditions

Figure 6 Motion and Structure of Airway Cilia in Radial Spoke Head-Deficient Mice (A and B) Motion of cilia in airway tissue of WT (A) or Rsph4a−/− (knockout, or KO) (B) mice. Green, red, and blue dots denote cilia manifesting planar beating, rotation in a clockwise direction, and rotation in random directions, respectively. (C) Summary of the motion pattern of airway cilia. Green, red, and blue bars denote the percentages of cilia exhibiting the different motion patterns indicated in (A) and (B). (D–G) TEM of cross-sections of airway cilia of WT (D) or Rsph4a−/− (E–G) mice. (H) Summary of the arrangement of doublet microtubules in airway cilia. Red and blue bars denote the percentages of cilia showing regular arrangement and transposition of doublet microtubules, respectively. White and black size bars indicate 10 μm (A and B) and 50 nm (D–G), respectively. See also Figures S4 and S5. Developmental Cell 2015 35, 236-246DOI: (10.1016/j.devcel.2015.10.001) Copyright © 2015 Elsevier Inc. Terms and Conditions

Figure 7 Radial Spokes Maintain Regular Arrangement of Doublet Microtubules in the Face of Perturbation in Mouse Cilia (A–D) Motion of cilia in airway tissue of Rsph4a−/− mice cultured with DMSO or 5 μM Taxol for 30 or 120 min. Red and blue dots denote cilia rotating in a clockwise direction and in random directions, respectively. (E and F) Traces of ciliary tip rotation in clockwise (E) or random (F) directions. (G) Summary of the motion pattern for airway cilia of Rsph4a−/− mouse tissue treated with DMSO or Taxol for 120 min. Red and blue bars denote the percentages of cilia rotating in clockwise and random directions, respectively. (H–J) TEM of cross-sections of airway cilia of Rsph4a−/− mouse tissue cultured with DMSO or Taxol for 2 hr. (K) Summary of the arrangement of doublet microtubules for airway cilia treated as in (H)–(J). Red and blue bars denote the percentages of cilia showing regular arrangement and transposition of doublet microtubules, respectively. Red, white, and black size bars indicate 10 μm (A–D), 5 μm (E and F), and 50 nm (H–J), respectively. Developmental Cell 2015 35, 236-246DOI: (10.1016/j.devcel.2015.10.001) Copyright © 2015 Elsevier Inc. Terms and Conditions