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Ishida H, Woodman AG, Kitada N, Aizawa T, Vogel HJ. The Dictyostelium discoideum FimA protein, unlike yeast and plant fimbrins, is regulated by calcium similar to mammalian plastins. Sci Rep 2023; 13:16208. [PMID: 37758724 PMCID: PMC10533516 DOI: 10.1038/s41598-023-42682-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Accepted: 09/13/2023] [Indexed: 09/29/2023] Open
Abstract
Plastins, also known as fimbrins, are highly conserved eukaryotic multidomain proteins that are involved in actin-bundling. They all contain four independently folded Calponin Homology-domains and an N-terminal headpiece that is comprised of two calcium-binding EF-hand motifs. Since calcium-binding has been shown to be integral to regulating the activity of the three mammalian plastin proteins, we decided to study the properties of the headpiece regions of fimbrins from the model plant Arabidopsis thaliana, the yeasts Saccharomyces cerevisiae and Schizosaccharomyces pombe and the amoeba Dictyostelium discoideum. Of these protein domains only the FimA headpiece from the amoeba protein possesses calcium binding properties. Structural characterization of this protein domain by multidimensional NMR and site-directed mutagenesis studies indicates that this EF-hand region of FimA also contains a regulatory 'switch helix' that is essential to regulating the activity of the human L-plastin protein. Interestingly this regulatory helical region seems to be lacking in the plant and yeast proteins and in fimbrins from all other nonmotile systems. Typical calmodulin antagonists can displace the switch-helix from the FimA headpiece, suggesting that such drugs can deregulate the Ca2+-regulation of the actin-bunding in the amoeba, thereby making it a useful organism for drug screening against mammalian plastins.
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Affiliation(s)
- Hiroaki Ishida
- Biochemistry Research Group, Department of Biological Sciences, University of Calgary, Calgary, AB, T2N 1N4, Canada
| | - Andrew G Woodman
- Biochemistry Research Group, Department of Biological Sciences, University of Calgary, Calgary, AB, T2N 1N4, Canada
| | - Naoya Kitada
- Faculty of Advanced Life Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Tomoyasu Aizawa
- Faculty of Advanced Life Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Hans J Vogel
- Biochemistry Research Group, Department of Biological Sciences, University of Calgary, Calgary, AB, T2N 1N4, Canada.
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Shimizu S, Kusakabe S, Toyama M, Takagaki T, Kitada N, Yamamoto K, Ikeda M, Ichimura Y, Burrow MF, Hotta M, Nikaido T. Bacterial adhesion and antibacterial property of coating materials containing theobromine and S-PRG filler. Dent Mater J 2023; 42:112-120. [PMID: 36476682 DOI: 10.4012/dmj.2021-307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 12/12/2022]
Abstract
Theobromine (TB) has been reported to promote tooth remineralization, strengthen tooth substance, and relieve dentin hypersensitivity. This study aimed to evaluate experimental tooth coating materials containing TB and surface pre-reacted glass-ionomer (S-PRG) fillers by examining the effects on bacterial adhesion and antibacterial properties. In addition, the amount of TB eluted from the coating material was measured. There was no significant difference in bacterial adhesion depending on the presence or absence of TB in the coating material, however, a significant decrease in the amount of bacterial adhesion was observed when S-PRG fillers were added to the coating material. The amount of eluted TB did not differ depending on the type of the filler in the coating material. It was suggested that TB could be used to develop a new dental material with the potential ability to inhibit the initiation and progression of dental caries.
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Affiliation(s)
- Shojiro Shimizu
- Department of Operative Dentistry, Division of Oral Functional Science and Rehabilitation, School of Dentistry, Asahi University
| | - Shusuke Kusakabe
- Department of Operative Dentistry, Division of Oral Functional Science and Rehabilitation, School of Dentistry, Asahi University
| | - Michiru Toyama
- Central Research Laboratories, Radioactive Isotope Research Laboratory, Asahi University
| | - Tomohiro Takagaki
- Department of Operative Dentistry, Division of Oral Functional Science and Rehabilitation, School of Dentistry, Asahi University
| | - Naoya Kitada
- Department of Research and Development Shofu Inc
| | | | - Masaomi Ikeda
- Oral Prosthetic Engineering, Graduate School, Tokyo Medical and Dental University
| | - Yoh Ichimura
- Division of Endodontic and Operative Dentistry, Department of Restorative and Biomaterials Sciences, School of Dentistry, Meikai University
| | - Michael F Burrow
- Faculty of Dentistry, The University of Hong Kong, Prince Philip Dental Hospital
| | | | - Toru Nikaido
- Department of Operative Dentistry, Division of Oral Functional Science and Rehabilitation, School of Dentistry, Asahi University
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Taniguchi Y, Miwa M, Kitada N. Correction: Crystalline sponge X-ray analysis coupled with supercritical fluid chromatography: a novel analytical platform for the rapid separation, isolation, and characterization of analytes. Analyst 2021; 146:6333. [PMID: 34633396 DOI: 10.1039/d1an90076e] [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] [Indexed: 11/21/2022]
Abstract
Correction for 'Crystalline sponge X-ray analysis coupled with supercritical fluid chromatography: a novel analytical platform for the rapid separation, isolation, and characterization of analytes' by Yoshimasa Taniguchi et al., Analyst, 2021, 146, 5230-5235, DOI: 10.1039/D1AN00948F.
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Affiliation(s)
- Yoshimasa Taniguchi
- Kirin Central Research Institute, Research & Development Division, Kirin Holdings Company Ltd, 26-1, Muraoka-Higashi 2-chome, Fujisawa, Kanagawa 251-8555, Japan.
| | - Mayuka Miwa
- Kirin Central Research Institute, Research & Development Division, Kirin Holdings Company Ltd, 26-1, Muraoka-Higashi 2-chome, Fujisawa, Kanagawa 251-8555, Japan.
| | - Naoya Kitada
- Kirin Central Research Institute, Research & Development Division, Kirin Holdings Company Ltd, 26-1, Muraoka-Higashi 2-chome, Fujisawa, Kanagawa 251-8555, Japan.
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Yamamura R, Nakamura K, Kitada N, Aizawa T, Shimizu Y, Nakamura K, Ayabe T, Kimura T, Tamakoshi A. Associations of gut microbiota, dietary intake, and serum short-chain fatty acids with fecal short-chain fatty acids. Biosci Microbiota Food Health 2019; 39:11-17. [PMID: 32010539 PMCID: PMC6971417 DOI: 10.12938/bmfh.19-010] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Accepted: 09/18/2019] [Indexed: 12/31/2022]
Abstract
In recent years, short-chain fatty acids (SCFAs) have been reported to play an important role in maintaining human health. Fecal SCFA concentrations correlate well with colonic SCFA status
and gut microbiota composition. However, the associations with the gut microbiota functional pathway, dietary intake, blood SCFAs, and fecal SCFAs remain uncertain. To clarify these
relationships, we collected fecal samples, blood samples, and dietary habit data from 12 healthy adults aged 22–51 years. The relative abundance of several SCFA-producing bacteria, gut
microbiota diversity, and functional pathways related to SCFA biosynthesis were positively associated with fecal SCFAs even after adjusting for age and sex. Furthermore, fecal acetate was
likely to be positively associated with serum acetate. By contrast, dietary intake was not associated with fecal SCFAs. Overall, the present study highlights the potential usefulness of
fecal SCFAs as an indicator of the gut microbiota ecosystem and dynamics of SCFAs in the human body.
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Affiliation(s)
- Ryodai Yamamura
- Graduate School of Medicine, Hokkaido University, N15, W7, Kita-ku, Sapporo 060-8638, Japan
| | - Koshi Nakamura
- Graduate School of Medicine, University of the Ryukyus, 207 Uehara, Nishihara, Okinawa 903-0215, Japan.,Faculty of Medicine, Hokkaido University, N15, W7, Kita-ku, Sapporo 060-8638, Japan
| | - Naoya Kitada
- Graduate School of Life Science, Hokkaido University, N10, W8, Kita-ku, Sapporo 060-0810, Japan
| | - Tomoyasu Aizawa
- Faculty of Advanced Life Science, Hokkaido University, N10, W8, Kita-ku, Sapporo 060-0810, Japan
| | - Yu Shimizu
- Graduate School of Life Science, Hokkaido University, N10, W8, Kita-ku, Sapporo 060-0810, Japan
| | - Kiminori Nakamura
- Faculty of Advanced Life Science, Hokkaido University, N10, W8, Kita-ku, Sapporo 060-0810, Japan
| | - Tokiyoshi Ayabe
- Faculty of Advanced Life Science, Hokkaido University, N10, W8, Kita-ku, Sapporo 060-0810, Japan
| | - Takashi Kimura
- Faculty of Medicine, Hokkaido University, N15, W7, Kita-ku, Sapporo 060-8638, Japan
| | - Akiko Tamakoshi
- Faculty of Medicine, Hokkaido University, N15, W7, Kita-ku, Sapporo 060-8638, Japan
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He YL, Kitada N, Yasuhara M, Hori R. Quantitative estimation of renal clearance of N-acetylprocainamide in rats with various experimental acute renal failure. Eur J Pharm Sci 2001; 13:303-8. [PMID: 11384853 DOI: 10.1016/s0928-0987(01)00117-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [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: 10/18/2022]
Abstract
The dosage regimen of a drug eliminated predominantly through the kidney need to be adjusted for the patients with renal disease. The objective of the present study was to establish a quantitative approach to precisely predicting the renal clearances of basic drugs using N-1-methylnicotinamide (NMN). A variety of experimental acute renal failure (ARF) in rats were prepared and N-acetylprocainamide (NAPA) was used as a model drug. The renal clearances of NAPA were significantly decreased in rats with ARF, resulting in significantly increased plasma concentrations. Remarkable reduction in clearance ratios (CL(ratio)) was observed, indicating that the impairment in tubular and glomerular function did not proceed in a parallel manner. The renal clearance of NAPA (CL(rNAPA)) was better predicted from the renal clearance of NMN (CL(rNMN)) than from GFR. A mathematical equation was also constructed to estimate the CL(rNMN) from the NMN plasma concentration. Therefore, the renal clearance of basic drugs excreted predominantly from the kidney can be easily and more accurately estimated based on the concentrations of endogenous NMN to provide a precise dosage regimen for patients with renal failure.
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Affiliation(s)
- Y L He
- Department of Anaesthesia and Critical Care, Massachusetts General Hospital, Harvard Medical School, 55 Fruit Street, Boston, MA 02114, USA.
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Nakazawa K, Nakae Y, Ichikawa M, Yanaoka K, Kumamoto M, Oka Y, Ishihara Y, Kitada N, Yokoyama S, Tsuchihashi S, Morishita H, Itoh H, Nishioka S. [Torsion of an accessory spleen]. Nihon Shokakibyo Gakkai Zasshi 1997; 94:407-12. [PMID: 9216221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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Aoki Y, Akagi K, Kitada N, Tanaka Y, Fritz-Zieroth B. [Study of anti-tumor effects of hyperthermia combined with hydralazine on experimental tumor]. Nihon Igaku Hoshasen Gakkai Zasshi 1995; 55:987-92. [PMID: 8570396] [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: 01/31/2023]
Abstract
We analyzed tumor growth delay in experimental tumors after hyperthermia alone, hydralazine (HDZ) injection alone and the combination of these modalities. We also analyzed the energy parameter (ATP/Pi ratio) obtained by 31P-MRS (magnetic resonance spectroscopy). The purpose of this study was to evaluate the usefulness of 31P-MRS as an index of anti-tumor effect. FM3A tumor cells were transplanted subcutaneously in the hind legs of C3H/He mice. We dipped the tumors into a heated circulating water bath. 31P-MRS was performed with a CSI spectrometer. The anti-tumor effect obtained with HDZ alone was insignificant, but combined treatment with hyperthermia and HDZ had a significant synergistic effect. The ATP/Pi ratios for all groups treated separately with HDZ or hyperthermia were not different from the control, but the ATP/Pi ratio decreased after combined use of these agents. There was a significant correlation between the decrease in ATP/Pi ratio and tumor growth delay. We observed a direct relation between the delay in tumor growth and the decline in ATP/Pi ratio after combined treatment with HDZ and hyperthermia. The ATP/Pi ratio 24 hr after treatment may be useful in predicting the efficacy of the combined use of HDZ and hyperthermia.
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Affiliation(s)
- Y Aoki
- Department of Radiology, Kansai Medical University
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Kitada N, Akagi K, Tanaka Y, Fritz-Zieroth B. Evaluation of thermal damage after hyperthermia on murine experimental tumor by 31P-NMR spectroscopy--correlation between ATP and growth delay. J Radiat Res 1994; 35:65-73. [PMID: 7965991 DOI: 10.1269/jrr.35.65] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The usefulness of 31P-MRS (phosphate magnetic resonance spectroscopy) for evaluation of the anti tumor effect of hyperthermic treatment was examined. FM3A, an experimental tumor transplantable to C3H mice, was used. FM3A, transplanted subcutaneously to the femoral region, was subjected to hyperthermic treatment and 31P-MRS were measured at various times. Because the ATP/Pi ratio indicates the energy status of tumor cells, we conducted measurement of its sequential changes after hyperthermic treatment. With a water bath, hyperthermic treatment was performed at 44 degrees C. Twenty four hours after treatment, the ATP/Pi ratio dropped as the heating time was prolonged, showing an obvious converse correlation to the tumor growth curve on heating. Immediately after hyperthermic treatment, the ATP/Pi ratio fell drastically, began to recover after 18 hrs and remained unchanged up to the 24 hrs. The finding that the ATP/Pi ratio obtained in tumor tissue 24 hrs after hyperthermic treatment was correlated with tumor inhibition suggested that the ratio can be a possible parameter for evaluation of the anti tumor effect by heating. The ATP/Pi ratio obtained by 31P-MRS could be used for non-invasive prediction of tumor tissue damage by heating.
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Affiliation(s)
- N Kitada
- Dep. of Radiology, Kansai Medical University, Osaka, Japan
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Abstract
We investigated the distribution and stability of pirarubicin in human blood obtained from 12 healthy volunteers. The distribution of pirarubicin into blood cells showed marked temperature- and concentration-dependencies and the Arrhenius plot for pirarubicin uptake in blood was biphasic. Therefore, pirarubicin appears to be taken up into blood cells by a carrier-mediated system. Pirarubicin was mainly enzymatically metabolized to pirarubicinol in blood cells, but pirarubicin was not metabolized into doxorubicin in either blood or plasma. On the other hand, in plasma, pirarubicin was degraded to unknown inactive compounds instead of pirarubicinol. It is therefore suggested that blood cells serve to protect against the degradation of pirarubicin into inactive compounds in blood. Accordingly, when the monitoring of pirarubicin and its active metabolites is carried out in patients, both blood and plasma must be frozen immediately after blood collection.
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Affiliation(s)
- K Nagasawa
- Department of Hospital Pharmacy, Kyoto Pharmaceutical University, Japan
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Kitada N, Akagi K, Uda M, Hasegawa T, Oshima T, Tanaka Y. [Evaluation of thermal damage after hyperthermia on murine experimental tumor by 31P-NMR spectroscopy--correlation between ATP and growth curve]. Nihon Igaku Hoshasen Gakkai Zasshi 1992; 52:669-73. [PMID: 1508639] [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: 12/27/2022]
Abstract
The possibility of using 31P-NMR spectroscopy (31P-MRS) to estimate the effect of hyperthermic treatment on mouse FM3A tumor was investigated. 1 x 10(6) cells, suspended in saline, were subcutaneously inoculated to the right thigh of C3H mice. For hyperthermic treatment, the tumor-bearing leg was heated by immersing it in a water bath at 44 degrees C for 10, 20 or 30 min. The signal intensities of ATP and Pi of the tumor were measured utilizing the 31P-MRS technique to calculate the ATP/Pi ratio. Immediately after heating, the ATP/Pi ratio decreased markedly. Eighteen hours after hyperthermic treatment, the ratio recovered but was still smaller than the control value, then became almost constant by 24 hours after heating. The ATP/Pi ratio at 24 hours after heating decreased with increased length of heating and was inversely related to tumor regrowth after hyperthermic treatment. We concluded that non-invasive monitoring with 31P-MRS might provide a good indication of the effect of hyperthermic treatment.
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Affiliation(s)
- N Kitada
- Department of Radiology, Kansai Medical University
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Hata K, Kitada N, Gomyo T, Hamanaka M, Koganei A, Kan Z, Kawaguchi S, Amemiya T. [A case of hypertrophic obstructive cardiomyopathy with left atrial giant thrombus during anti-platelet therapy]. Kokyu To Junkan 1989; 37:341-6. [PMID: 2734512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
A case of a 77-year-old female with hypertrophic obstructive cardiomyopathy having the left atrial "giant" thrombus was reported; the diagnosis of the localization and size of the thrombus was made by employing echocardiography and contrast enhancement computed tomography as well. The clinical record indicated that the thrombus formation, which happened in the course of the antiplatelet therapy, was to be considered due to the complicated condition of the patient, i.e., the combination of atrial fibrillation, low cardiac output, enlargement of left atrium and left ventricular diastolic disfunction, which assumed to predispose the giant thrombus. Avoiding the surgical removal of the thrombus because of the poor conditions of the patient, urokinase treatment was attempted, but not successful, which might be derived from the nature of the thrombus already organized. In general, left atrial giant thrombus is very uncommon status; if any, it is occasionally complicated with mitral stenosis. The case reported deems to be very rare, enough worthy to be reported.
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