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Zhdanova I, Masuda K, Quasarano-Kourkoulis C, Rosene D, Killiany R, Wang S. Aging of Intrinsic Circadian Rhythms and Sleep in a Diurnal Nonhuman Primate, Macaca mulatta. J Biol Rhythms 2011; 26:149-59. [DOI: 10.1177/0748730410395849] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
There is growing evidence that alterations in the intrinsic circadian clock and sleep might affect the aging process. The rhesus monkey ( Macaca mulatta) provides unique opportunities to explore the role of the clock in successful and unsuccessful physiological and cognitive aging in a diurnal primate with consolidated nighttime sleep, complex cognitive functions, long life span, and phylogenetic proximity to humans. A longitudinal study was conducted to characterize the effects of aging on the entrained and intrinsic circadian rhythms of activity, polysomnographic sleep patterns, and melatonin production in unrestrained male rhesus monkeys [6—9 ( n = 6) and 24—28 ( n = 4) years of age]. An age-dependent decline was found in the stability of circadian rhythms of activity and in peak melatonin levels. The range of individual intrinsic circadian periods (τ) is not age-dependent. Aged monkeys do not display clearly defined “morningness-eveningness” chronotypes and, unlike the young, show no correlation between the chronotype under entrained conditions and the length of intrinsic circadian period. The daily activity period (α) is reduced with age and this is associated with high day-to-day variability in sleep quantity and quality, fragmentation of nighttime sleep and daytime wakefulness, increased daytime sleep time, overall increase in stage 1 sleep, and reduced time spent in rapid-eye movement and slow-wave sleep. In the absence of environmental time cues, age-dependent changes in sleep and circadian rhythms are exacerbated and circadian patterns of sleep in young rhesus monkeys start resembling those in aged animals, together suggesting important role of circadian regulation in aging sleep phenotype. This first characterization of age-dependent changes in the intrinsic rhythms and sleep in rhesus monkeys, demonstrating major similarities to human aging phenotype, should assist in the search for the mechanisms involved and for effective prophylactic and therapeutic strategies.
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Takada K, Nakane T, Masuda K, Ishii H. Ursolic acid and oleanolic acid, members of pentacyclic triterpenoid acids, suppress TNF-α-induced E-selectin expression by cultured umbilical vein endothelial cells. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2010; 17:1114-9. [PMID: 20579861 DOI: 10.1016/j.phymed.2010.04.006] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2010] [Accepted: 04/23/2010] [Indexed: 05/29/2023]
Abstract
E-selectin is an early response adhesion molecule expressed on the surface of endothelial cells during inflammatory responses. We examined the effects of two pentacyclic triterpenoid acids, ursolic acid (UA) and oleanolic acid (OA), on the expression of E-selectin by cultured human umbilical vein endothelial cells (HUVECs). Treatment of the cells with UA or OA alone did not influence expression of E-selectin. Expression of E-selectin mRNA and surface antigen by HUVECs was induced by treatment with tumor necrosis factor-α (TNF-α) in a dose- and time-dependent manner. TNF-α-induced up-regulation of E-selectin was abrogated by pre-treatment of the cells with UA or OA which decreased expression of E-selectin mRNA. The repression of E-selectin mRNA expression caused by the pentacyclic triterpenoid acids paralleled the inhibition of NF-κB activation and nuclear translocation, as evaluated by electrophoretic mobility shift assays, although the degree of repression by UA was approximately two times more effective than that of OA. The results suggest that UA and OA suppress the inflammatory cytokine-induced expression of E-selectin in endothelial cells by decreasing E-selectin transcription via inhibition of NF-κB activation. Thus, UA and OA function as anti-inflammatory agents. The differences in the inhibitory efficacy between UA and OA may be due to conformational differences in ring-E of the two pentacyclic triterpenoid acids.
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Kaburaki Y, Fujimura T, Kurata K, Masuda K, Toda M, Yasueda H, Chida K, Kawarai S, Sakaguchi M. Induction of Th1 immune responses to Japanese cedar pollen allergen (Cry j 1) in mice immunized with Cry j 1 conjugated with CpG oligodeoxynucleotide. Comp Immunol Microbiol Infect Dis 2010; 34:157-61. [PMID: 20638725 DOI: 10.1016/j.cimid.2010.06.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2010] [Accepted: 06/22/2010] [Indexed: 11/18/2022]
Abstract
We determined whether a major Japanese cedar pollen allergen (Cry j 1) conjugated with CpG oligodeoxynucleotide would enhance allergen-specific Th1 responses in mice. Cry j 1 conjugated with CpG (Cry j 1-CpG) induced IL-12 in the spleen cells of naïve mice. Cry j 1-CpG immunization of BALB/c mice suppressed anti-Cry j 1 IgE response and enhanced anti-Cry j 1 IgG(2a) to subsequent Cry j 1 and alum adjuvant injection. CD4(+)T cells isolated from the spleens in mice immunized with Cry j 1-CpG produced higher IFN-γ levels than did CD4(+)T cells obtained from mice as negative controls. Our results suggested that Cry j 1-CpG immunization can induce Cry j 1-specific Th1 immune responses, thereby inhibiting IgE response to the pollen allergen.
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Yamaguchi N, Hamachi T, Kamio N, Akifusa S, Masuda K, Nakamura Y, Nonaka K, Maeda K, Hanazawa S, Yamashita Y. Expression levels of adiponectin receptors and periodontitis. J Periodontal Res 2010; 45:296-300. [DOI: 10.1111/j.1600-0765.2009.01222.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Takeuchi Y, Kaneko F, Hashizume C, Masuda K, Ogata N, Maki T, Inoue-Murayama M, Hart BL, Mori Y. Association analysis between canine behavioural traits and genetic polymorphisms in the Shiba Inu breed. Anim Genet 2009; 40:616-22. [PMID: 19397510 DOI: 10.1111/j.1365-2052.2009.01888.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Masuda K, Katoh N, Mizutani H, Kishimoto S. Anaphylaxis to vitamin B2 added to an energy drink. Clin Exp Dermatol 2009; 34:e263-4. [PMID: 19438528 DOI: 10.1111/j.1365-2230.2008.03173.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Furuichi Y, Masuda K, Takakura H, Hotta N, Ishida K, Katayama K, Iwase S, Akima H. Effect of Intensive Interval Training during Unloading on Muscle Deoxygenation Kinetics. Int J Sports Med 2009; 30:563-8. [DOI: 10.1055/s-0029-1202824] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Adhikari A, Devkota HP, Takano A, Masuda K, Nakane T, Basnet P, Skalko-Basnet N. Screening of Nepalese crude drugs traditionally used to treat hyperpigmentation:in vitrotyrosinase inhibition. Int J Cosmet Sci 2008; 30:353-60. [DOI: 10.1111/j.1468-2494.2008.00463.x] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Gaudi BS, Bennett DP, Udalski A, Gould A, Christie GW, Maoz D, Dong S, McCormick J, Szymański MK, Tristram PJ, Nikolaev S, Paczyński B, Kubiak M, Pietrzyński G, Soszyński I, Szewczyk O, Ulaczyk K, Wyrzykowski Ł, DePoy DL, Han C, Kaspi S, Lee CU, Mallia F, Natusch T, Pogge RW, Park BG, Abe F, Bond IA, Botzler CS, Fukui A, Hearnshaw JB, Itow Y, Kamiya K, Korpela AV, Kilmartin PM, Lin W, Masuda K, Matsubara Y, Motomura M, Muraki Y, Nakamura S, Okumura T, Ohnishi K, Rattenbury NJ, Sako T, Saito T, Sato S, Skuljan L, Sullivan DJ, Sumi T, Sweatman WL, Yock PCM, Albrow MD, Allan A, Beaulieu JP, Burgdorf MJ, Cook KH, Coutures C, Dominik M, Dieters S, Fouqué P, Greenhill J, Horne K, Steele I, Tsapras Y, Chaboyer B, Crocker A, Frank S, Macintosh B. Discovery of a Jupiter/Saturn Analog with Gravitational Microlensing. Science 2008; 319:927-30. [DOI: 10.1126/science.1151947] [Citation(s) in RCA: 281] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Asanbaeva A, Masuda K, Thonar EJMA, Klisch SM, Sah RL. Cartilage growth and remodeling: modulation of balance between proteoglycan and collagen network in vitro with beta-aminopropionitrile. Osteoarthritis Cartilage 2008; 16:1-11. [PMID: 17631390 DOI: 10.1016/j.joca.2007.05.019] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2007] [Accepted: 05/26/2007] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To examine the effect of beta-aminopropionitrile (BAPN), an inhibitor of lysyl oxidase, on growth and remodeling of immature articular cartilage in vitro. DESIGN Immature bovine articular cartilage explants from the superficial and middle layers were cultured for 13 days in serum-containing medium with or without BAPN. Variations in tissue size, accumulation of proteoglycan and collagen (COL), and tensile mechanical properties were assessed. RESULTS The inclusion of serum resulted in expansive tissue growth, stimulation of proteoglycan and COL deposition, and a diminution of tensile integrity. Supplementation of medium with BAPN accentuated this phenotype in terms of a further increase in tissue size in explants from the superficial layer and further diminution of tensile integrity, without affecting the contents of proteoglycan and COL in explants from both the superficial and middle layers. CONCLUSION COL crosslinking is a major factor in modulating the phenotype of cartilage growth and the associated balance between proteoglycan content and integrity of the COL network.
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Ugumori T, Masuda K, Namba S. Luminescence due to exciton-electron and exciton-excitons collision in GaSe. ACTA ACUST UNITED AC 2007. [DOI: 10.1007/bf02723536] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Takamatsu T, Fujimoto T, Masuda K, Yoshikawa K. Spatial Distribution of D-D Neutrons from a Compact Water-Cooled Inertial Electrostatic Confinement Device. FUSION SCIENCE AND TECHNOLOGY 2007. [DOI: 10.13182/fst07-a1647] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Tomkoria S, Masuda K, Mao J. Nanomechanical properties of alginate-recovered chondrocyte matrices for cartilage regeneration. Proc Inst Mech Eng H 2007; 221:467-73. [PMID: 17822149 DOI: 10.1243/09544119jeim205] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Tissue-engineered cartilage constructs designed for in-vivo applications intuitively should mimic the mechanical properties of native cartilage. The objective of the present work was to characterize the nanomechanical properties of alginate-recovered chondrocyte matrices as a function of ex-vivo incubation time. Chondrocytes isolated from the articular cartilage of the mature bovine metacarpophalangeal joints were cultured with alginate hydrogel to allow for the formation of extracellular matrices. The recovered chondral constructs after 2, 4, 8, and 12 weeks of ex-vivo incubation were analysed using nanoindentation with atomic force microscopy to determine their mechanical properties. Chondral constructs had average Young's moduli of 123±22 kPa, 174±31 kPa, 373±40 kPa, and 564±79 kPa after incubation for 2, 4, 8, and 12 weeks respectively, indicating the gradual attainment of mechanical stiffness. This escalating trend of micromechanical properties as a function of increasing ex-vivo incubation time suggests that chondral constructs via a tissue-engineering approach are capable of elaborating extracellular matrices and increase mechanical stiffness. The relationship between Young's modulus and incubation time of the chondral constructs is useful in the design and fabrication of tissue-engineered cartilage constructs.
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Schiff A, Li J, Inoue N, Masuda K, Lidtke R, Muehleman C. Trabecular angle of the human talus is associated with the level of cartilage degeneration. JOURNAL OF MUSCULOSKELETAL & NEURONAL INTERACTIONS 2007; 7:224-230. [PMID: 17947804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The architecture of bone trabeculae is based on the direction of stresses applied to the bone. The human talar dome receives compressive forces from the tibia and, to a much lesser extent, the fibula when standing, walking, and running, and transmits the force downward to the calcaneus through the talar body and anterior to the navicular via the talar head. As a result, the body of the talus has predominately vertical trabeculae. However, here we hypothesize that cartilage degeneration at the articular surface is associated with trabecular angle within the associated bone, as a reflection of joint alignment and/or biomechanics (stability, congruence, angulation, etc). Through measurement of trabecular angle with Fast Fourier Transform Analysis, we show a positive correlation between the cartilage degeneration score of the articular surface of the talar dome and the angle of trabecular deviation from the perpendicular axis of the dome (right talus R=0.75, p<0.01; left talus R=0.79, p<0.01).
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Fujii N, Hiroki K, Matsumoto S, Masuda K, Inoue M, Tanaka Y, Awakura M, Akaboshi M. Correlation Between the Loss of the Chaperone-like Activity and the Oxidation, Isomerization and Racemization of Gamma-irradiated Alpha-crystallin¶. Photochem Photobiol 2007. [DOI: 10.1562/0031-8655(2001)0740477cbtlot2.0.co2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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116
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Fujimura T, Futamura N, Midoro-Horiuti T, Togawa A, Goldblum RM, Yasueda H, Saito A, Shinohara K, Masuda K, Kurata K, Sakaguchi M. Isolation and characterization of native Cry j 3 from Japanese cedar (Cryptomeria japonica) pollen. Allergy 2007; 62:547-53. [PMID: 17441795 PMCID: PMC2587458 DOI: 10.1111/j.1398-9995.2007.01331.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Japanese cedar (Cryptomeria japonica) pollinosis is the most prevalent allergy in Japan. Recently, the Japanese cedar pollen allergen Cry j 3 was cloned as a homologue of Jun a 3, which is a major allergen from mountain cedar (Juniperus ashei) pollen. However, native Cry j 3 has not been isolated and there are no reports on its allergenic activity. The aims of this study were to isolate native Cry j 3 and assess its immunoglobulin E (IgE)-binding capacity in patients with Japanese cedar pollinosis. METHODS Native Cry j 3 was purified from Japanese cedar pollen by multidimensional chromatography. We assessed the IgE-binding capacity using sera from patients allergic to Japanese cedar pollen by immunoblot analysis and ELISA. Moreover, we assayed the capacity of Cry j 3 to induce histamine release from the patients' leukocytes. We cloned cDNA corresponding to purified Cry j 3 from a cDNA library of Japanese cedar pollen. RESULTS We isolated native Cry j 3 as a 27-kDa protein. The IgE-binding frequency of Cry j 3 from the sera of patients allergic to Japanese cedar pollen was estimated as 27% (27/100) by ELISA. Cry j 3 induced the release of histamine from leukocytes. We cloned the cDNA and named it Cry j 3.8. Cry j 3.8 cDNA encoded 225 amino acids and had significant homology with thaumatin-like proteins. CONCLUSIONS Cry j 3 is a causative allergen in Japanese cedar pollinosis and may play crucial roles in the cross-reactivity with oral allergy syndrome.
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Ohmori S, Masuda K, Arai T. Characteristics of Photocytotoxicity with high peak power pulsed irradiation: Comparison of Photodynamic Therapy with two photosensitizers, Photofrin® and mono-L-aspartyl chlorin e6 on prostate cancer cell in vitro. CONFERENCE PROCEEDINGS : ... ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL CONFERENCE 2007; 2006:217-9. [PMID: 17282151 DOI: 10.1109/iembs.2005.1616382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
We proposed novel depth-controlled photodynamic therapy (PDT) by varying pulsed laser irradiation condition. We focus on photocytotoxicity suppression under high peak power pulsed irradiation to apply this phenomenon to surface intact therapy to preserve healthy wall of a hollow organ. The relation between laser irradiation condition and cell lethality of rat prostate cancer cell with PDT using practical photosensitizers, mono-L-aspartyl chlorine e6 (ME2906) and Photofrin® was investigated. We found cell lethality suppression from 63 % to 20 % when the irradiated pulsed peak power density ranged from 0.2 to 1.4 mW/cm<sup>2</sup>with ME2906 mediated PDT. There was no significant photocytotoxicity suppression in case of Photofrin® mediated PDT. Singlet oxygen luminescence from the two different kinds of photosensitizer solution was measured. The pulse peak power dependence of singlet oxygen luminescence intensity correlated with the photocytotoxicity. We think the photocytotoxicity suppression with high peak power pulsed irradiation with ME2906 might be useful for the therapeutic depth controlled PDT without damage on the surface of a hollow organ.
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Katoh N, Soga F, Nara T, Tamagawa-Mineoka R, Nin M, Kotani H, Masuda K, Kishimoto S. Effect of serotonin on the differentiation of human monocytes into dendritic cells. Clin Exp Immunol 2007; 146:354-61. [PMID: 17034589 PMCID: PMC1942053 DOI: 10.1111/j.1365-2249.2006.03197.x] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
The local cytokine environment and presence of stimulatory signals determine whether monocytes acquire dendritic cell (DC) or macrophage characteristics and functions. Because enhanced platelet activation is reported in patients with many allergic disorders, such as atopic dermatitis, platelet-derived factors may influence monocytic differentiation into DC. In this study we examined the effect of serotonin, a prototypic mediator of allergic inflammation released mainly by activated platelets at the inflammatory site, on the granulocyte-macrophage colony-stimulating factor (GM-CSF) and interleukin (IL)-4-driven differentiation of monocytes into monocyte-derived DC. Monocytes from healthy adult donors were cultured with GM-CSF and IL-4 in the presence or absence of serotonin, and the phenotypes and function of these cells were analysed. In the presence of serotonin, monocytes differentiated into DC with reduced expression of co-stimulatory molecules and CD1a, whereas expression of CD14 was increased. These serotonin-treated DC exhibited significantly reduced stimulatory activity toward allogeneic T cells. However, these cells showed enhanced cytokine-producing capacity, including IL-10 but not IL-12. There was no significant difference between both types of DC in phagocytic activity. Experiments using agonists and antagonists indicated that serotonin 5-hydroxytryptamine (5-HT) induced the alteration of their phenotype and reduction in antigen-presenting capacity were mediated via 5-HTR(1/7). It is therefore suggested that serotonin-driven DC may have a regulatory function in the inflammatory process.
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Akeda K, An HS, Okuma M, Attawia M, Miyamoto K, Thonar EJMA, Lenz ME, Sah RL, Masuda K. Platelet-rich plasma stimulates porcine articular chondrocyte proliferation and matrix biosynthesis. Osteoarthritis Cartilage 2006; 14:1272-80. [PMID: 16820306 DOI: 10.1016/j.joca.2006.05.008] [Citation(s) in RCA: 251] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/03/2006] [Accepted: 05/10/2006] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Platelet-rich plasma (PRP) is a fraction of plasma that contains high levels of multiple growth factors. The purpose of this study was to examine the effects of PRP on cell proliferation and matrix synthesis by porcine chondrocytes cultured in alginate beads, conditions that promote the retention of the chondrocytic phenotype, in order to determine the plausibility of using this plasma-derived material for engineering cartilage. DESIGN PRP and platelet-poor plasma (PPP) were prepared from adult porcine blood. Adult porcine chondrocytes were cultured in the presence of 10% PRP, 10% PPP or 10% fetal bovine serum (FBS) for 3 days. Cell proliferation, proteoglycan (PG) and collagen synthesis were quantified, and the structure of newly synthesized PG and collagen was characterized. RESULTS Treatment with 10% PRP resulted in a small but significant increase in DNA content (+11%, vs FBS; P<0.01; vs PPP; P<0.001). PG and collagen syntheses by the PRP-treated chondrocytes were markedly higher than those by chondrocytes treated by FBS or PPP (PG; PRP: +115% vs FBS; +151% vs PPP, both P<0.0001, collagen; PRP: +163% vs FBS; +163% vs PPP, both P<0.0001). Biochemical analyses revealed that treatment with PRP growth factors did not markedly affect the types of PGs and collagens produced by porcine chondrocytes, suggesting that the cells remained phenotypically stable in the presence of PRP. CONCLUSION PRP isolated from autologous blood may be useful as a source of anabolic growth factors for stimulating chondrocytes to engineer cartilage tissue.
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Kim KH, Dobi A, Shaheduzzaman S, Gao CL, Masuda K, Li H, Drukier A, Gu Y, Srikantan V, Rhim JS, Srivastava S. Characterization of the androgen receptor in a benign prostate tissue-derived human prostate epithelial cell line: RC-165N/human telomerase reverse transcriptase. Prostate Cancer Prostatic Dis 2006; 10:30-8. [PMID: 17075604 DOI: 10.1038/sj.pcan.4500915] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The majority of prostate epithelial cell lines stably expressing wild-type (wt) or mutant (mt) androgen receptor (AR) are derived from metastatic prostate cancers. Therefore, the wt AR-expressing RC-165N/human telomerase reverse transcriptase (hTERT) cell line derived from the benign prostate tissue of an African-American patient provides a unique opportunity to assess the functional status of AR in a cellular context not studied before. Although androgen-induced expression of known androgen responsive genes such as PMEPA1, and NDRG1 was observed in RC-165N/hTERT, this cell line expresses prostate-specific antigen (PSA) at significantly lower levels. Chromatin immunoprecipitation assay revealed androgen-dependent binding of AR to androgen response elements of PSA, PMEPA1 and NDRG1 genes. Similarities, as well as differences were noted in the expression of androgen responsive genes between RC-165N/hTERT and LNCaP cells. Comprehensive evaluations of AR functions in RC-165N/hTERT cells suggest that whereas some features of known AR functions are maintained in this benign prostatic tissue-derived cell line, other AR functions are not retained. Objective evaluations of similar cell lines will lead to the understanding of AR functions in prostate growth and differentiation.
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Masuda K, Sato A. Electronic theory for screw dislocation motion in dilute b.c.c. transition metal alloys. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/01418618108239549] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Masuda K, Kobayashi K, Sato A, Mori T. Calculation of core structure and core energy of 1/2⟨111⟩{110} and 1/2⟨111⟩{112} edge dislocations in a b.c.c. transition metal: moments approach. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/01418638108225798] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Masuda K, Richter M, Song X, Berezov A, Masuda K, Murali R, Greene MI, Zhang H. AHNP-streptavidin: a tetrameric bacterially produced antibody surrogate fusion protein against p185her2/neu. Oncogene 2006; 25:7740-6. [PMID: 16785990 DOI: 10.1038/sj.onc.1209745] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The anti-p185(her2/neu) peptidomimetic (AHNP) is a small exo-cyclic peptide derived from the anti-p185(her2/neu) rhumAb 4D5 (h4D5). AHNP mimics many but not all of the antitumor characteristics exhibited by h4D5. However, the pharmacokinetic profiles of AHNP are less than optimal for therapeutic or diagnostic purposes. To improve the binding affinity to p185(her2/neu) and the antitumor efficacy, we have engineered a fusion protein containing AHNP and a nonimmunoglobulin protein scaffold, streptavidin (SA). The recombinant protein, AHNP-SA (ASA) bound to p185(her2/neu) with high affinity, inhibited the proliferation of p185(her2/neu)-overexpressing cells, and reduced tumor growth induced by p185(her2/neu)-transformed cells. These data suggest that the bacterially produced tetrameric ASA can be used as an antibody-surrogate molecule. This class of molecule will play a role in the diagnosis and treatment of p185(her2/neu)-related tumors. Our studies establish a general principle by which a small biologically active synthetic exo-cyclic peptide can be engineered to enhance functional aspects by structured oligomerization and can be produced recombinantly using bacterial expression.
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Hirohashi Y, Wang Q, Liu Q, Li B, Du X, Zhang H, Furuuchi K, Masuda K, Sato N, Greene MI. Centrosomal proteins Nde1 and Su48 form a complex regulated by phosphorylation. Oncogene 2006; 25:6048-55. [PMID: 16682949 DOI: 10.1038/sj.onc.1209637] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The centrosome modulates spindle formation and plays a critical role in guiding proper segregation of chromosomes during cell division. Centrosome aberrations, frequently seen in human tumors, may cause abnormal chromosome segregation and contribute to malignant transformation. To explore the components of the centrosomes, we previously identified a novel centrosomal protein called Su48. To further characterize the Su48-containing protein ensemble in the centrosome, we performed yeast two-hybrid screens and isolated a number of Su48-interacting molecules, including the centrosomal protein Nde1. Here, we demonstrate that Su48 can associate with Nde1. Moreover, we found that Nde1 is subjected to phosphorylation in vivo. In particular, we identified six putative Cdc2 phosphorylation sites in Nde1 and found that alteration of these sites diminishes phosphorylation by Cdc2 in vitro and affects the stability of Su48-Nde1 interactions and the centrosomal localization of Nde1. Ablation of Nde1 by gene specific small interfering RNA causes mitotic delay and cell death, coupled with a modest decrease in the incidence of the cells that harbor excessive centrosomes. Collectively, our findings indicate that Nde1 can form a protein complex with Su48 in the centrosome and plays an important role for successful mitosis.
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Masuda K, Pfister BE, Sah RL, Thonar EJMA. Osteogenic protein-1 promotes the formation of tissue-engineered cartilage using the alginate-recovered-chondrocyte method. Osteoarthritis Cartilage 2006; 14:384-91. [PMID: 16324853 DOI: 10.1016/j.joca.2005.10.006] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/23/2004] [Accepted: 10/08/2005] [Indexed: 02/02/2023]
Abstract
OBJECTIVE This study examined the effects of a growth factor, recombinant human osteogenic protein-1 (rhOP-1), on the formation of tissue-engineered cartilaginous tissue by adult bovine articular chondrocytes using the alginate-recovered-chondrocyte (ARC) method. DESIGN To ascertain if rhOP-1 enhances the formation of the cell-associated matrix (CM) and the characteristics of CM formation, bovine articular chondrocytes were first cultured for up to 14 days in alginate beads in medium supplemented with serum, with or without rhOP-1. Then, the recovered chondrocytes and their associated CM were resuspended in medium, with or without OP-1, seeded onto culture inserts, and incubated for an additional 14 days. The fabricated ARC tissues were subjected to biochemical and histological analyses. RESULTS The addition of rhOP-1 to the medium in the alginate bead culture step resulted in an increased accumulation of both proteoglycan (PG) and collagen, with a ratio of PG to collagen that was higher than that found in native adult cartilage. The addition of rhOP-1 in the second step had a similar stimulatory effect during 14 days of culture. Histological examination of the tissue formed under all conditions revealed a cartilage-like matrix, stained strongly by toluidine blue. The thickness of the tissues obtained from culture conditions that included the addition of rhOP-1 was four times greater than that of the tissues cultured without rhOP-1. CONCLUSIONS Using the ARC method, rhOP-1 enhanced the formation of matrix and generated a voluminous tissue-engineered cartilaginous construct. These characteristics may be beneficial in generating constructs that can cover large defects.
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