1
|
Nishibori Y, Akiyoshi K, Omori R, Nakatani Y, Akaishi Y, Tanaka A, Tokunaga S, Daga H. 105P The efficacy of nivolumab monotherapy for advanced gastric cancer depends on the HER2 status. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.10.141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022] Open
|
2
|
Yamaguchi H, Wakuda K, Fukuda M, Kenmotsu H, Ito K, Tsuchiya-Kawano Y, Tanaka K, Harada T, Nakatani Y, Miura S, Yokoyama T, Nakamura T, Izumi M, Nakamura A, Ikeda S, Takayama K, Yoshimura K, Nakagawa K, Yamamoto N, Sugio K. 990P Osimertinib for RT-naïve CNS metastasis of EGFR mutation-positive NSCLC: Phase II OCEAN study (LOGIK 1603/WJOG 9116L), part of the first-line cohort. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.07.1117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
|
3
|
Yokoyama S, Fujita Y, Matsumura S, Yoshimura T, Kinoshita I, Watanabe T, Tabata H, Tsuji T, Ozawa S, Tamaki T, Nakatani Y, Oka M. Cribriform carcinoma in the lymph nodes is associated with distant metastasis, recurrence, and survival among patients with node-positive colorectal cancer. Br J Surg 2021; 108:e111-e112. [PMID: 33793704 DOI: 10.1093/bjs/znaa123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Accepted: 11/15/2020] [Indexed: 11/13/2022]
Abstract
Cribriform lymph node pattern is an independent risk factor for metachronous or synchronous distant metastasis in patients with stage III and IV node-positive colorectal cancer. Multivariable analysis in patients with stage III disease indicated that the cribriform pattern of carcinoma in the lymph nodes was an independent risk factor for recurrence and survival. Kaplan–Meier analysis demonstrated that the group with stage III cribriform-type lymph node carcinoma had shorter recurrence-free and overall survival times than the stage III group with the tubular type (P < 0.001).
Collapse
Affiliation(s)
- S Yokoyama
- Department of Surgery, National Hospital Organization Minami Wakayama Medical Centre, Wakayama, Japan
| | - Y Fujita
- Department of Surgery, National Hospital Organization Minami Wakayama Medical Centre, Wakayama, Japan
| | - S Matsumura
- Department of Surgery, National Hospital Organization Minami Wakayama Medical Centre, Wakayama, Japan
| | - T Yoshimura
- Department of Surgery, National Hospital Organization Minami Wakayama Medical Centre, Wakayama, Japan
| | - I Kinoshita
- Department of Surgery, National Hospital Organization Minami Wakayama Medical Centre, Wakayama, Japan
| | - T Watanabe
- Department of Surgery, National Hospital Organization Minami Wakayama Medical Centre, Wakayama, Japan
| | - H Tabata
- Department of Surgery, National Hospital Organization Minami Wakayama Medical Centre, Wakayama, Japan
| | - T Tsuji
- Department of Surgery, National Hospital Organization Minami Wakayama Medical Centre, Wakayama, Japan
| | - S Ozawa
- Department of Surgery, National Hospital Organization Minami Wakayama Medical Centre, Wakayama, Japan
| | - T Tamaki
- Department of Surgery, National Hospital Organization Minami Wakayama Medical Centre, Wakayama, Japan
| | - Y Nakatani
- Department of Surgery, National Hospital Organization Minami Wakayama Medical Centre, Wakayama, Japan
| | - M Oka
- Department of Surgery, National Hospital Organization Minami Wakayama Medical Centre, Wakayama, Japan
| |
Collapse
|
4
|
Baba N, Miura N, Kuwamura S, Ueno S, Nakatani Y, Ichimoto K. Shift-and-add image processing incorporated with the unsharp masking method. Appl Opt 2021; 60:6725-6729. [PMID: 34613148 DOI: 10.1364/ao.428770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Accepted: 07/03/2021] [Indexed: 06/13/2023]
Abstract
Shift-and-add (SAA) is a simple image processing procedure. SAA was devised to reconstruct a diffraction-limited image from atmospherically degraded stellar images. Recently SAA has been applied to biological imaging. There are several variants of SAA. Here proposed is an SAA procedure incorporated with unsharp masking (USM). The SAA procedure proposed here encompasses an extended version of USM. The proposed SAA method retains the simplicity and easiness, and the basic features of SAA. The effectiveness of the proposed method is examined by restoring atmospherically degraded solar images. It is shown that the USM SAA reconstructed image exhibits high contrast and reveals fine structures blurred by atmospheric turbulence. It is also shown that the USM SAA performs better with a data frame selection scheme.
Collapse
|
5
|
Albone E, Cheng X, Verdi A, Jacob S, Fernando S, Furuuchi K, Fulmer J, Soto A, Drozdowski B, Mano Y, Nakatani Y, Uenaka T. 579P MORAb-109: A site-specific eribulin-conjugated ADC targeting human mesothelin. Ann Oncol 2020. [DOI: 10.1016/j.annonc.2020.08.693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
6
|
Nakatani Y, Ueda S, Tsuboguchi Y, Yoshii Y, Akiyoshi K, Tsuya A, Okazaki S, Tokunaga S, Daga H. TAS-102 followed by regorafenib or the reverse sequence in advanced colorectal cancer. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy431.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
7
|
Yamaki C, Takayama T, Itoh Y, Nakatani Y, Wakao F. Reaching Out to Public Libraries to Help Reduce Cancer Information Disparity. J Glob Oncol 2018. [DOI: 10.1200/jgo.18.14800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
In light of growing interest in people taking more proactive roles in managing the course of long term illnesses, ensuring ready access to cancer information supporting programs has become one of the paramount mandates, for many national cancer control programs. In Japan, the Center for Cancer Control and Information Services, a division of the National Cancer Center Japan (NCC-CIS), is tasked with dissemination of reliable and comprehensive cancer information for all citizens including patients and their families. NCC-CIS compiled cancer information has long been delivered via both dedicated portal “Ganjoho (Cancer Information) Service” ( https://ganjoho.jp ) as well as brochures. As majority of cancer patients and their carers tend to be seniors who are not net-savvy, the portal has its limitations as dissemination channel. A more personalized support is provided by a nationwide network of Cancer Information and Support Centers (CISCs), collocated within 434 state-designated cancer hospitals. CISCs offer both information and counseling support to anyone who has cancer related issues, even if they have never been treated at the given facility. While CISC is a public service, subsidized with national and prefectural funding, many of those in need, remain unaware of the CISCs - at least in part, due to its very location, within a hectic acute care settings. To reach a wider audience, NCC-CIS and CISCs have started to collaborate with public libraries which have traditionally been a neighborhood source of reference information for both the young and old, and clearly more approachable than medical professionals in large hospitals. We have begun by disseminating a “starter-kit” of NCC-CIS publications to public libraries that have signed up with “Cancer Information Gift” project, a donor funded effort launched last summer. To date, almost 60 libraries have taken up this opportunity to either launch a new “Cancer Information Corner”. We have also brought the participating libraries and local CISCs together in regional workshops settings, to explore ways to mutually complement the information services offered by both parties. Collaborative initiatives that have come out of such explorations include “Book Talk on Disease in Library”, an interactive session in relaxed settings, where participants can feel more at ease, raising a wide range of personal concerns, around an issue highlighted in a given book, with both librarians and cancer counselors mediating the discussion. Referrals to CISCs from libraries are also beginning though in low volumes. While the “Cancer Information Gift” project, and its related initiatives are still very much at a nascent stage, we believe this collaboration could potentially go a lot further, to make reliable cancer information (and CISCs) more accessible to a wider segment of those in need, and in the process, help reduce the cancer disparity across the nation.
Collapse
|
8
|
Ueda S, Tsuboguchi Y, Nakatani Y, Tsuya A, Nishina SI, Akiyoshi K, Okazaki S, Tokunaga S, Daga H. Sidedness of the primary tumor on the effect of TAS-102 for refractory metastatic colorectal cancer. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy281.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
9
|
Nakatani Y, Hisatomi O. Quantitative analyses of the equilibria among DNA complexes of a blue-light-regulated bZIP module, Photozipper. Biophys Physicobiol 2018; 15:8-17. [PMID: 29450110 PMCID: PMC5812316 DOI: 10.2142/biophysico.15.0_8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Accepted: 11/21/2017] [Indexed: 01/28/2023] Open
Abstract
Aureochrome1 is a blue-light-receptor protein identified in a stramenopile alga, Vaucheria frigida. Photozipper (PZ) is an N-terminally truncated, monomeric, V. frigida aureochrome1 fragment containing a basic leucine zipper (bZIP) domain and a light–oxygen–voltage (LOV)-sensing domain. PZ dimerizes upon photoexcitation and consequently increases its affinity for the target sequence. In the present study, to understand the equilibria among DNA complexes of PZ, DNA binding by PZ and mutational variants was quantitatively investigated by electrophoretic-mobility-shift assay and fluorescence-correlation spectroscopy in the dark and light states. DNA binding by PZ was sequence-specific and light-dependent. The half-maximal effective concentration of PZ for binding to the target DNA sequence was ~40 nM in the light, which was >10-fold less than the value in the dark. By contrast, the dimeric PZ-S2C variant (with intermolecular disulfide bonds) had higher affinity for the target sequence, with dissociation constants of ~4 nM, irrespective of the light conditions. Substitutions of Glu159 and Lys164 in the leucine zipper region decreased the affinity of PZ for the target sequence, especially in the light, suggesting that these residues form inter-helical salt bridges between leucine zipper regions, stabilizing the dimer–DNA complex. Our quantitative analyses of the equilibria in PZ–DNA-complex formation suggest that the blue-light-induced dimerization of LOV domains and coiled-coil formation by leucine zipper regions are the primary determinants of the affinity of PZ for the target sequence.
Collapse
Affiliation(s)
- Yoichi Nakatani
- Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Osamu Hisatomi
- Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| |
Collapse
|
10
|
Shiina Y, Suzuki H, Sakairi Y, Tamura H, Wada H, Fujiwara T, Nakajima T, Chiyo M, Ota M, Ota S, Nakatani Y, Yoshino I. P2.07-008 Does PD-L1 Expression of the Archive Surgical Specimen of Primary Tumor Predict the Sensitivity of Recurrence to Nivolumab in Patients with NSCLC? J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.11.067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
11
|
Takeda Y, Morishita S, Kasahara T, Kawai T, Nakatani Y, Muraki R, Yamashita S. P2358Coronary vessel responses after paclitaxel-coated balloon in diabetic patients did not differ from those in non-diabetic patients: serial volumetric intravascular ultrasound analysis. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx502.p2358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
12
|
Nakatani Y, Maeda M, Matsumura M, Shimizu R, Banba N, Aso Y, Yasu T, Harasawa H. Effect of GLP-1 receptor agonist on gastrointestinal tract motility and residue rates as evaluated by capsule endoscopy. Diabetes Metab 2017. [PMID: 28648835 DOI: 10.1016/j.diabet.2017.05.009] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
AIM This study evaluated the effects of a glucagon-like peptide-1 receptor agonist on gastrointestinal (GI) tract motility and residue rates by examining GI transit time and lumen using capsule endoscopy. MATERIAL AND METHODS GI motility and lumen were assessed by capsule endoscopy before and after liraglutide administration in 14 patients with type 2 diabetes mellitus (T2DM). RESULTS Gastric transit time in the group with diabetic neuropathy (DN) was 1:12:36±1:04:30h before liraglutide administration and 0:48:40±0:32:52h after administration (nonsignificant difference, P=0.19). Gastric transit time in the non-DN group was 1:01:30±0:52:59h before administration and 2:33:29±1:37:24h after administration (significant increase, P=0.03). Duodenal and small intestine transit time in the DN group was 4:10:34±0:25:54h before and 6:38:42±3:52:42h after administration (not significant, P=0.09) and, in the non-DN group, 3:51:03±0:53:47h before and 6:45:31±2:41:36h after administration (significant increase, P=0.03). The GI residue rate in the DN group was 32.1±24% before administration and 90.0±9.1% after administration (significant increase, P<0.001), and increased in all patients; in the non-DN group, it was 32.1±35.3% before and 78.3±23.9% after administration (significant increase, P<0.001), and also increased in all patients. CONCLUSION Liraglutide causes delayed gastric emptying and inhibits duodenal and small intestine motility. However, these GI movement-inhibiting effects may be decreased or absent in patients with DN-associated dysautonomia.
Collapse
Affiliation(s)
- Y Nakatani
- Department of Diabetes and Endocrinology, Dokkyo Medical University Nikko Medical Center, 632, Takatoku Nikkoshi, 321-2593 Tochigi, Japan.
| | - M Maeda
- Department of Gastroenterology, Dokkyo Medical University Nikko Medical Center, 632, Takatoku Nikkoshi, 321-2593 Tochigi, Japan
| | - M Matsumura
- Department of Endocrinology and Metabolism, Dokkyo Medical University, 880, Kitakobayashi Shimotsugagun Mibumachi, 321-0293 Tochigi, Japan
| | - R Shimizu
- Department of Cardiovascular Medicine, Dokkyo Medical University Nikko Medical Center, 632, Takatoku Nikkoshi, 321-2593 Tochigi, Japan
| | - N Banba
- Department of Diabetes and Endocrinology, Dokkyo Medical University Nikko Medical Center, 632, Takatoku Nikkoshi, 321-2593 Tochigi, Japan
| | - Y Aso
- Department of Endocrinology and Metabolism, Dokkyo Medical University, 880, Kitakobayashi Shimotsugagun Mibumachi, 321-0293 Tochigi, Japan
| | - T Yasu
- Department of Cardiovascular Medicine, Dokkyo Medical University Nikko Medical Center, 632, Takatoku Nikkoshi, 321-2593 Tochigi, Japan
| | - H Harasawa
- Department of Pulmonary Medicine, Dokkyo Medical University Nikko Medical Center, 632, Takatoku Nikkoshi, 321-2593 Tochigi, Japan
| |
Collapse
|
13
|
Krajewski-Bertrand MA, Nakatani Y, Ourisson G, Dufourc EJ, Milon A. Anisotropic 2H-NMR spin-lattice relaxation in oriented bilayers of DMPC and DMPC + cholesterol. ACTA ACUST UNITED AC 2017. [DOI: 10.1051/jcp/1992890237] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
14
|
Akiyama Y, Nakasone Y, Nakatani Y, Hisatomi O, Terazima M. Time-Resolved Detection of Light-Induced Dimerization of Monomeric Aureochrome-1 and Change in Affinity for DNA. J Phys Chem B 2016; 120:7360-70. [PMID: 27404115 DOI: 10.1021/acs.jpcb.6b05760] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Aureochrome (Aureo) is a recently discovered blue light sensor protein initially from Vaucheria frigida, in which it controls blue light-dependent branch formation and/or development of a sex organ by a light-dependent change in the affinity for DNA. Although photochemical reactions of Aureo-LOV (LOV is a C-terminal light-oxygen-voltage domain) and the N-terminal truncated construct containing a bZIP (N-terminal basic leucine zipper domain) and a LOV domain have previously been reported, the reaction kinetics of the change in affinity for DNA have never been elucidated. The reactions of Aureo where the cysteines are replaced by serines (AureoCS) as well as the kinetics of the change in affinity for a target DNA are investigated in the time-domain. The dimerization rate constant is obtained as 2.8 × 10(4) M(-1) s(-1), which suggests that the photoinduced dimerization occurs in the LOV domain and the bZIP domain dimerizes using the interaction with DNA. Surprisingly, binding with the target DNA is completed very quickly, 7.7 × 10(4) M(-1) s(-1), which is faster than the protein dimerization rate. It is proposed that the nonspecific electrostatic interaction, which is observed as a weak binding with DNA, may play a role in the efficient searching for the target sequence within the DNA.
Collapse
Affiliation(s)
- Yuki Akiyama
- Department of Chemistry, Graduate School of Science, Kyoto University , Kyoto 606-8502, Japan
| | - Yusuke Nakasone
- Department of Chemistry, Graduate School of Science, Kyoto University , Kyoto 606-8502, Japan
| | - Yoichi Nakatani
- Department of Earth and Space Science, Graduate School of Science, Osaka University , Osaka 560-0043, Japan
| | - Osamu Hisatomi
- Department of Earth and Space Science, Graduate School of Science, Osaka University , Osaka 560-0043, Japan
| | - Masahide Terazima
- Department of Chemistry, Graduate School of Science, Kyoto University , Kyoto 606-8502, Japan
| |
Collapse
|
15
|
Kanazawa N, Nakatani Y, Inaba Y, Kunimoto K, Furukawa F, Ozaki F. Temporal changes of serum cytokine/chemokine levels in patients of Nakajo-Nishimra syndrome treated with tocilizumab. Pediatr Rheumatol Online J 2015. [PMCID: PMC4599846 DOI: 10.1186/1546-0096-13-s1-p169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
|
16
|
Kakehashi H, Ando T, Minamizato T, Nakatani Y, Kawasaki T, Ikeda H, Kuroshima S, Kawakami A, Asahina I. Administration of teriparatide improves the symptoms of advanced bisphosphonate-related osteonecrosis of the jaw: preliminary findings. Int J Oral Maxillofac Surg 2015; 44:1558-64. [PMID: 26304604 DOI: 10.1016/j.ijom.2015.07.018] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2015] [Revised: 06/19/2015] [Accepted: 07/24/2015] [Indexed: 11/16/2022]
Abstract
Teriparatide is a synthetic polypeptide hormone that contains the 1-34 amino acid fragment of the recombinant human parathyroid hormone that stimulates bone formation. Currently, it is approved only for the treatment of osteoporosis. The outcomes of daily teriparatide injections for the treatment of bisphosphonate-related osteonecrosis of the jaw in 10 patients are reported here. Two of the 10 cases dropped out due to adverse events. Of the remaining eight cases, seven exhibited clinical improvement of the jaw-related symptoms of osteonecrosis and progression of the sequestration, while one case did not show improvement of the symptoms. Administration of teriparatide in patients with osteonecrosis of the jaw promotes bone formation and subsequent sequestration over a short period of time. These results suggest that adjunctive teriparatide therapy is a viable and effective option for treating osteonecrosis of the jaw.
Collapse
Affiliation(s)
- H Kakehashi
- Department of Regenerative Oral Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - T Ando
- Department of Endocrinology and Metabolism, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - T Minamizato
- Department of Regenerative Oral Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - Y Nakatani
- Department of Regenerative Oral Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - T Kawasaki
- Department of Regenerative Oral Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - H Ikeda
- Department of Regenerative Oral Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - S Kuroshima
- Department of Applied Prosthodontics, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - A Kawakami
- Department of Endocrinology and Metabolism, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - I Asahina
- Department of Regenerative Oral Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan.
| |
Collapse
|
17
|
Nakatani Y, Hisatomi O. Molecular Mechanism of Photozipper, a Light-Regulated Dimerizing Module Consisting of the bZIP and LOV Domains of Aureochrome-1. Biochemistry 2015; 54:3302-13. [DOI: 10.1021/acs.biochem.5b00320] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yoichi Nakatani
- Department of Earth and Space
Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Osamu Hisatomi
- Department of Earth and Space
Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| |
Collapse
|
18
|
Nakatani Y, Ribeiro N, Streiff S, Gotoh M, Pozzi G, Désaubry L, Milon A. Search for the most 'primitive' membranes and their reinforcers: a review of the polyprenyl phosphates theory. ORIGINS LIFE EVOL B 2014; 44:197-208. [PMID: 25351682 PMCID: PMC4669544 DOI: 10.1007/s11084-014-9365-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2013] [Accepted: 09/17/2014] [Indexed: 11/26/2022]
Abstract
Terpenoids have an essential function in present-day cellular membranes, either as membrane reinforcers in Eucarya and Bacteria or as principal membrane constituents in Archaea. We have shown that some terpenoids, such as cholesterol and α, ω-dipolar carotenoids reinforce lipid membranes by measuring the water permeability of unilamellar vesicles. It was possible to arrange the known membrane terpenoids in a ‘phylogenetic’ sequence, and a retrograde analysis led us to conceive that single-chain polyprenyl phosphates might have been ‘primitive’ membrane constituents. By using an optical microscopy, we have observed that polyprenyl phosphates containing 15 to 30 C-atoms form giant vesicles in water in a wide pH range. The addition of 10 % molar of some polyprenols to polyprenyl phosphate vesicles have been shown to reduce the water permeability of membranes even more efficiently than the equimolecular addition of cholesterol. A ‘prebiotic’ synthesis of C10 and C15 prenols from C5 monoprenols was achieved in the presence of a montmorillonite clay. Hypothetical pathway from C1 or C2 units to ‘primitive’ membranes and that from ‘primitive’ membranes to archaeal lipids are presented.
Collapse
Affiliation(s)
- Yoichi Nakatani
- Institute of Chemistry, University of Strasbourg - CNRS, 67000, Strasbourg, France,
| | | | | | | | | | | | | |
Collapse
|
19
|
Nakatani Y, Fujita T, Sawa S, Otani T, Hori Y, Takagahara I. Changes in ATP-Related Compounds of Beef and Rabbit Muscles and a New Index of Freshness of Muscle. ACTA ACUST UNITED AC 2014. [DOI: 10.1080/00021369.1986.10867652] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
20
|
|
21
|
|
22
|
|
23
|
|
24
|
|
25
|
Yamamoto T, Sakairi Y, Nakajima T, Suzuki H, Tagawa T, Iwata T, Mizobuchi T, Yoshida S, Nakatani Y, Yoshino I. Comparison between endobronchial ultrasound-guided transbronchial needle aspiration and 18F-fluorodeoxyglucose positron emission tomography in the diagnosis of postoperative nodal recurrence in patients with lung cancer. Eur J Cardiothorac Surg 2014; 47:234-8. [DOI: 10.1093/ejcts/ezu214] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
|
26
|
Nakatani Y, Larsen DS, Cutfield SM, Cutfield JF. Major Change in Regiospecificity for the Exo-1,3-β-glucanase from Candida albicans following Its Conversion to a Glycosynthase. Biochemistry 2014; 53:3318-26. [DOI: 10.1021/bi500239m] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Y. Nakatani
- Biochemistry
Department, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
| | - D. S. Larsen
- Chemistry
Department, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
| | - S. M. Cutfield
- Biochemistry
Department, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
| | - J. F. Cutfield
- Biochemistry
Department, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
| |
Collapse
|
27
|
Hisatomi O, Nakatani Y, Takeuchi K, Takahashi F, Kataoka H. Blue light-induced dimerization of monomeric aureochrome-1 enhances its affinity for the target sequence. J Biol Chem 2014; 289:17379-91. [PMID: 24790107 DOI: 10.1074/jbc.m114.554618] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Aureochrome-1 (AUREO1) is a blue light (BL) receptor that mediates the branching response in stramenopile alga, Vaucheria frigida. AUREO1 contains a basic leucine zipper (bZIP) domain in the central region and a light-oxygen-voltage sensing (LOV) domain at the C terminus, and has been suggested to function as a light-regulated transcription factor. We have previously reported that preparations of recombinant AUREO1 contained the complete coding sequence (full-length, FL) and N-terminal truncated protein (ZL) containing bZIP and LOV domains, and suggested that wild-type ZL (ZLwt2) was in a dimer form with intermolecular disulfide linkages at Cys(162) and Cys(182) (Hisatomi, O., Takeuchi, K., Zikihara, K., Ookubo, Y., Nakatani, Y., Takahashi, F., Tokutomi, S., and Kataoka, H. (2013) Plant Cell Physiol. 54, 93-106). In the present study, we report the photoreactions, oligomeric structures, and DNA binding of monomeric cysteine to serine-mutated ZL (ZLC2S), DTT-treated ZL (DTT-ZL), and FL (DTT-FL). Recombinant AUREO1 showed similar spectral properties and dark regeneration kinetics to those of dimeric ZLwt2. Dynamic light scattering and size exclusion chromatography revealed that ZLC2S and DTT-ZL were monomeric in the dark state. Dissociation of intermolecular disulfide bonds of ZLwt2 was in equilibrium with a midpoint oxidation-redox potential of approximately -245 ± 15 mV. BL induced the dimerization of monomeric ZL, which subsequently increased its affinity for the target sequence. Also, DTT-FL was monomeric in the dark state and underwent BL-induced dimerization, which led to formation of the FL2·DNA complex. Taken together, our results suggest that monomeric AUREO1 is present in vivo, with dimerization playing a key role in its role as a BL-regulated transcription factor.
Collapse
Affiliation(s)
- Osamu Hisatomi
- From the Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043,
| | - Yoichi Nakatani
- From the Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043
| | - Ken Takeuchi
- From the Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043
| | - Fumio Takahashi
- the Department of Biotechnology, College of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho Kawaguchi, Saitama 332-0012, and
| | - Hironao Kataoka
- the Botanical Gardens, Tohoku University, 12-2 Kawauchi, Aoba-ku, Sendai 980-0862, Japan
| |
Collapse
|
28
|
|
29
|
Nakatani Y, Mizumaki K, Nishida K, Sakamoto T, Yamaguchi Y, Kataoka N, Sakabe M, Fujiki A, Inoue H. Electrophysiological and anatomical differences of the slow pathway between the fast-slow form and slow-slow form of atrioventricular nodal reentrant tachycardia. Europace 2013; 16:551-7. [DOI: 10.1093/europace/eut253] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
30
|
Hisatomi O, Takeuchi K, Zikihara K, Ookubo Y, Nakatani Y, Takahashi F, Tokutomi S, Kataoka H. Blue Light-Induced Conformational Changes in a Light-Regulated Transcription Factor, Aureochrome-1. ACTA ACUST UNITED AC 2012; 54:93-106. [DOI: 10.1093/pcp/pcs160] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
|
31
|
Shimizu A, Tamura A, Abe M, Amano H, Motegi S, Nakatani Y, Hoshino H, Ishikawa O. Human papillomavirus type 56-associated Bowen disease. Br J Dermatol 2012; 167:1161-4. [DOI: 10.1111/j.1365-2133.2012.11071.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
32
|
Koyama T, Ueda K, Kim KJ, Yoshimura Y, Chiba D, Yamada K, Jamet JP, Mougin A, Thiaville A, Mizukami S, Fukami S, Ishiwata N, Nakatani Y, Kohno H, Kobayashi K, Ono T. Current-induced magnetic domain wall motion below intrinsic threshold triggered by Walker breakdown. Nat Nanotechnol 2012; 7:635-639. [PMID: 22961306 DOI: 10.1038/nnano.2012.151] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2012] [Accepted: 08/06/2012] [Indexed: 06/01/2023]
Abstract
Controlling the position of a magnetic domain wall with electric current may allow for new types of non-volatile memory and logic devices. To be practical, however, the threshold current density necessary for domain wall motion must be reduced below present values. Intrinsic pinning due to magnetic anisotropy, as recently observed in perpendicularly magnetized Co/Ni nanowires, has been shown to give rise to an intrinsic current threshold J(th)(0). Here, we show that domain wall motion can be induced at current densities 40% below J(th)(0) when an external magnetic field of the order of the domain wall pinning field is applied. We observe that the velocity of the domain wall motion is the vector sum of current- and field-induced velocities, and that the domain wall can be driven against the direction of a magnetic field as large as 2,000 Oe, even at currents below J(th)(0). We show that this counterintuitive phenomenon is triggered by Walker breakdown, and that the additive velocities provide a unique way of simultaneously determining the spin polarization of current and the Gilbert damping constant.
Collapse
Affiliation(s)
- T Koyama
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
33
|
Nakatani Y, Ribeiro N, Streiff S, Désaubry L, Ourisson G. Search for the most primitive membranes: some remaining problems. ORIGINS LIFE EVOL B 2012; 42:497-501. [PMID: 23080009 DOI: 10.1007/s11084-012-9313-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2012] [Accepted: 08/22/2012] [Indexed: 10/27/2022]
Affiliation(s)
- Yoichi Nakatani
- Institut de Chimie, Université de Strasbourg, 1, rue Blaise Pascal, 67008 Strasbourg, France.
| | | | | | | | | |
Collapse
|
34
|
Kitamura A, Takiguchi Y, Kurosu K, Takigawa N, Saegusa F, Hiroshima K, Nakajima T, Tanabe N, Nakatani Y, Yoshino I, Tatsumi K. Feasibility of cytological diagnosis of sarcoidosis with endobronchial US-guided transbronchial aspiration. Sarcoidosis Vasc Diffuse Lung Dis 2012; 29:82-89. [PMID: 23461069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
BACKGROUND Endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) has a high diagnostic value in sarcoidosis if the obtained histological specimen is indicative of a non-caseating epithelioid-cell granuloma. However, EBUS-TBNA in sacoidosis sometimes affords solely cytological specimens. OBJECTIVE To investigate the relevance of EBUS-TBNA cytology specimens in diagnosing sarcoidosis. DESIGN The study population comprised 72 patients with sarcoidosis and 116 patients who had thoracic malignancies and intrathoracic lymphadenopathy but were eventually proven to be metastasis-free (controls). The EBUS-TBNA samples obtained for these subjects were blindly evaluated for the presence of epithelioid cell clusters by 2 independent cytoscreeners and a pathologist. RESULTS Interobserver variability in the specimen grading was minimal. The sensitivity and specificity were 65.3% and 94.0%, respectively. The sensitivity was high, at 87.5%, for the combined cytological and histological examinations. Of 7 controls whose cytological specimens showed epithelioid cell clusters, 3 were also deemed positive for sarcoidosis on histological examination, which indicated that they had sarcoid reaction to cancer. CONCLUSIONS Cytological evaluation of the EBUS-TBNA specimens had higher sensitivity than histological evaluation alone for intrathoracic lymphadenopathy due to sarcoidosis. It should be recognized, however, that up to 6% of patients with thoracic malignancy may have sarcoid reaction in non-metastatic lymph nodes.
Collapse
Affiliation(s)
- A Kitamura
- Department of Respirology, Graduate School of Medicine, Chiba University, Japan
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
35
|
Fujimoto H, Kazama T, Nagashima T, Sakakibara M, Suzuki H, Ohki Y, Miyoshi T, Okubo Y, Nakatani Y, Mlyazaki M. 86 Diffusion-weighted Imaging Reflects Pathological Therapeutic Response and Predicts Relapse in Breast Cancer. Eur J Cancer 2012. [DOI: 10.1016/s0959-8049(12)70154-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
36
|
Hamada Y, Wake M, Kumagai K, Nakaoka K, Yamada H, Nakatani Y, Suzuki R, Fukui N. Up regulation of IL-6 and VEGF-A in the synovial fluid of temporomandibular joint affected by synovial chondromatosis. Int J Oral Maxillofac Surg 2011. [DOI: 10.1016/j.ijom.2011.07.658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
|
37
|
Mizumaki K, Nishida K, Iwamoto J, Nakatani Y, Yamaguchi Y, Sakamoto T, Tsuneda T, Inoue H, Sakabe M, Fujiki A. Early repolarization in Wolff-Parkinson-White syndrome: prevalence and clinical significance. Europace 2011; 13:1195-200. [DOI: 10.1093/europace/eur144] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
|
38
|
Nakatani Y, Satoh T, Saito S, Watanabe M, Yoshiike N, Kumagai S, Sugita-Konishi Y. Simulation of deoxynivalenol intake from wheat consumption in Japan using the Monte Carlo method. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2011; 28:471-6. [DOI: 10.1080/19440049.2010.545956] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
39
|
Koyama T, Chiba D, Ueda K, Kondou K, Tanigawa H, Fukami S, Suzuki T, Ohshima N, Ishiwata N, Nakatani Y, Kobayashi K, Ono T. Observation of the intrinsic pinning of a magnetic domain wall in a ferromagnetic nanowire. Nat Mater 2011; 10:194-197. [PMID: 21336264 DOI: 10.1038/nmat2961] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2010] [Accepted: 01/13/2011] [Indexed: 05/30/2023]
Abstract
The spin transfer torque is essential for electrical magnetization switching. When a magnetic domain wall is driven by an electric current through an adiabatic spin torque, the theory predicts a threshold current even for a perfect wire without any extrinsic pinning. The experimental confirmation of this 'intrinsic pinning', however, has long been missing. Here, we give evidence that this intrinsic pinning determines the threshold, and thus that the adiabatic spin torque dominates the domain wall motion in a perpendicularly magnetized Co/Ni nanowire. The intrinsic nature manifests itself both in the field-independent threshold current and in the presence of its minimum on tuning the wire width. The demonstrated domain wall motion purely due to the adiabatic spin torque will serve to achieve robust operation and low energy consumption in spintronic devices.
Collapse
|
40
|
Ueno S, Shibata K, Kitai R, Ichimoto K, Nagata S, Isobe H, Kimura G, Nakatani Y, Kadota M, Ishii TT, Morita S, Otsuji K. The CHAIN-Project and Installation of Flare Monitoring Telescopes in Developing Countries. Data Sci J 2009. [DOI: 10.2481/dsj.8.s51] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
|
41
|
Nakaoka K, Hamada Y, Nkaoka K, Sonoyama T, Horie A, Arai G, Nakatani Y, Nakatani H, Seto K. P.430 Changes in MRI flndings of the TMJ after simple irrigation. J Craniomaxillofac Surg 2008. [DOI: 10.1016/s1010-5182(08)72218-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
|
42
|
Nagai Y, Hayama N, Kishimoto T, Furuya M, Takahashi Y, Otsuka M, Miyazaki M, Nakatani Y. Predominance of IgG4+ plasma cells and CD68 positivity in sclerosing angiomatoid nodular transformation (SANT). Histopathology 2008; 53:495-8. [PMID: 18752536 DOI: 10.1111/j.1365-2559.2008.03118.x] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
|
43
|
Fujiki A, Sakamoto T, Sakabe M, Tsuneda T, Sugao M, Nakatani Y, Mizumaki K, Inoue H. Junctional rhythm associated with ventriculoatrial block during slow pathway ablation in atypical atrioventricular nodal re-entrant tachycardia. Europace 2008; 10:982-7. [DOI: 10.1093/europace/eun151] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
44
|
Shimizu A, Tamura A, Abe M, Motegi S, Nagai Y, Ishikawa O, Nakatani Y, Yamamoto Y, Uezato H, Hoshino H. Detection of human papillomavirus type 56 in Bowen's disease involving the nail matrix. Br J Dermatol 2008; 158:1273-9. [PMID: 18410409 DOI: 10.1111/j.1365-2133.2008.08562.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND As Bowen's disease of the nail apparatus is quite rare, there have been only a few reports on the prevalence of human papillomavirus (HPV) infection in this condition. OBJECTIVES The purpose of this study was to clarify the association of HPV with this disease involving the nail apparatus. METHODS Five patients with Bowen's disease of the nail apparatus were investigated clinically, virologically and histologically. Total DNAs extracted from excised skin lesions were analysed using polymerase chain reaction (PCR) for the presence of HPV DNA and the amplified products were subjected to DNA sequence analyses. Histological localization of HPV DNA was examined by in situ hybridization. RESULTS In three of five patients, HPV was detected by PCR amplification, and subsequent sequence analyses of the PCR products showed the sequences of HPV type 56. A common clinical feature of the three HPV-positive patients was longitudinal melanonychia. In contrast, the two HPV-negative patients presented with a convex nail deformity and a periungual ulcerative lesion. In two of three positive cases, there was a silent point mutation in the L1 gene of each HPV. In the remaining one case, the nucleotide sequence was consistent with the consensus sequence of HPV 56. Sequence analyses of the E6 gene revealed the infection of different variants of HPV 56 among the three cases. The viral genomes were located in keratinocyte nuclei upon in situ hybridization. CONCLUSIONS HPV 56 may be involved in the carcinogenesis of Bowen's disease affecting the nail matrix with longitudinal pigmentation.
Collapse
Affiliation(s)
- A Shimizu
- Department of Dermatology, Gunma University Graduate School of Medicine, 3-39-22 Showa-machi, Maebashi, Gunma 371-8511, Japan.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
45
|
Cutfield J, Nakatani Y, Patrick W, Cutfield S. Analysis of carbohydrate binding in a family 5 exoglucanase. Acta Crystallogr A 2007. [DOI: 10.1107/s0108767307097309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
46
|
Gotoh M, Sugawara A, Akiyoshi K, Matsumoto I, Ourisson G, Nakatani Y. Possible molecular evolution of biomembranes: from single-chain to double-chain lipids. Chem Biodivers 2007; 4:837-48. [PMID: 17510999 DOI: 10.1002/cbdv.200790071] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
We have studied a possible evolution process permitting a 'primitive' membrane to evolve towards a membrane structure with an outer wall, similar to that of bacteria. We have investigated whether a polysaccharide bearing hydrophobic phytyl or cholesteryl chains coats giant vesicles made of single- or double-chain lipids. Phytyl-pullulan 5b was found to bind to the surface of vesicles made of either single- or double-chain lipids. In contrast, cholesteryl-pullulan 5a only coated the surface of vesicles made of double-chain lipids. These results indicate that there must be a close match between the size and shape of membrane constituents and the hydrophobic molecules to be inserted. This process could, thus, provide a selection mechanism of lipid-membrane constituents during the course of biomembrane evolution. The presence of the above 'hydrophobized' polysaccharides on the surface of different giant vesicles was identified by lectin binding. Both concanavalin A and annexin V were shown by fluorescence microscopy to bind spontaneously to vesicles made of double-chain lipids. Our experiments exemplify that self-organization of amphiphiles into closed vesicles in aqueous solution automatically leads to the coating of vesicles by 'hydrophobized' polysaccharides, which then permit lectin binding. This is a possible mechanism for the evolution of primitive membranes towards 'proto-cells'.
Collapse
Affiliation(s)
- Mari Gotoh
- Centre de Neurochimie, 5 rue Blaise Pascal, 67084 Strasbourg, France
| | | | | | | | | | | |
Collapse
|
47
|
Nagashima T, Sakakibara M, Nakamura R, Arai M, Kadowaki M, Kazama T, Nakatani Y, Koda K, Miyazaki M. Dynamic enhanced MRI predicts chemosensitivity in breast cancer patients. Clin Imaging 2007. [DOI: 10.1016/j.clinimag.2007.02.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
48
|
Ribeiro N, Streiff S, Heissler D, Elhabiri M, Albrecht-Gary AM, Atsumi M, Gotoh M, Désaubry L, Nakatani Y, Ourisson G. Reinforcing effect of bi- and tri-cyclopolyprenols on ‘primitive’ membranes made of polyprenyl phosphates. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.01.076] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
49
|
Streiff S, Ribeiro N, Wu Z, Gumienna-Kontecka E, Elhabiri M, Albrecht-Gary AM, Ourisson G, Nakatani Y. “Primitive” Membrane from Polyprenyl Phosphates and Polyprenyl Alcohols. ACTA ACUST UNITED AC 2007; 14:313-9. [PMID: 17379146 DOI: 10.1016/j.chembiol.2006.11.017] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2006] [Revised: 11/20/2006] [Accepted: 11/20/2006] [Indexed: 11/28/2022]
Abstract
Polyprenyl phosphates, as well as polyprenyl alcohols bearing different isopentenyl C(5) units, have been synthesized. The pH range of spontaneous vesicle formation of polyprenyl phosphates with or without polyprenyl alcohols was defined by fluorescence microscopy. A variety of the acyclic or monocyclic polyprenyl phosphates studied formed stable vesicles in water over a wide range of pHs, and the addition of polyprenyl alcohols allowed the vesicle formation of polyprenyl phosphates at higher pHs. Osmotic swelling of a suspension of unilamellar vesicles using the stopped-flow/light-scattering method enabled us to evaluate the water permeability of polyprenyl phosphate vesicles with or without 10 mol% of free polyprenyl alcohol. The addition of many polyprenyl alcohols to polyprenyl phosphate vesicles decreased the water permeability, and some reduced it even more efficiently than cholesterol.
Collapse
Affiliation(s)
- Stéphane Streiff
- Centre de Neurochimie CNRS, Institut de Chimie LC3-UMR 7177, Université Louis Pasteur, 5 rue Blaise Pascal, F-67084 Strasbourg, France
| | | | | | | | | | | | | | | |
Collapse
|
50
|
Gotoh M, Miki A, Nagano H, Ribeiro N, Elhabiri M, Gumienna-Kontecka E, Albrecht-Gary AM, Schmutz M, Ourisson G, Nakatani Y. Membrane properties of branched polyprenyl phosphates, postulated as primitive membrane constituents. Chem Biodivers 2007; 3:434-55. [PMID: 17193280 DOI: 10.1002/cbdv.200690047] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
We have postulated earlier that the highly branched isoprenoid alkanes, which are distributed widely in many sediments, may have been derived from the corresponding branched polyprenyl phosphates, potentially present in biomembranes in primitive organisms. These polyprenyl-branched polyprenyl phosphates might be derived by a simple alkylation from non-substituted polyprenyl phosphates, which we postulate to be the precursors of all membrane terpenoids. We have now synthesized a series of 6-(poly)prenyl-substituted polyprenyl phosphates and studied the formation of vesicles from these phosphates, as a function of the substituted-chain length, the position of the double bond, and pH. Nine of the branched polyprenyl phosphates containing 20-30 C-atoms do form vesicles at a 'physiological' pH; the lipophilicity/hydrophilicity ratio is as expected an important factor. We have also studied the water permeability through membranes of these branched polyprenyl phosphate vesicles by our stopped-flow/light-scattering method. These highly branched polyprenyl phosphates can more effectively reduce the water permeability than non-substituted polyprenyl phosphates: the vesicles formed by the former are more stable against mechanical stress. This reinforces our hypothesis about the origin of the sedimentary polyprenyl-substituted polyprene hydrocarbons.
Collapse
Affiliation(s)
- Mari Gotoh
- Centre de Neurochimie, 5 rue Blaise Pascal, F-67084 Strasbourg
| | | | | | | | | | | | | | | | | | | |
Collapse
|