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Shimada H, Hirano S, Sinotoh H, Ota T, Tanaka N, Sato K, Yamada M, Fukushi K, Irie T, Zhang MR, Higuchi M, Kuwabara S, Suhara T. Dementia with Lewy bodies can be well-differentiated from Alzheimer's disease by measurement of brain acetylcholinesterase activity-a [11C]MP4A PET study. Int J Geriatr Psychiatry 2015; 30:1105-13. [PMID: 26280153 DOI: 10.1002/gps.4338] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2015] [Revised: 07/07/2015] [Accepted: 07/08/2015] [Indexed: 11/12/2022]
Abstract
OBJECTIVE To investigate the diagnostic performance of brain acetylcholinesterase (AChE) activity measurement using N-[(11) C]-methyl-4-piperidyl acetate (MP4A) and PET in patients with dementia with Lewy bodies (DLB) and Alzheimer's disease (AD). METHODS Participants were 14 DLB patients, 25 AD patients and 18 age-matched healthy controls (HC). All subjects underwent PET scans and MP4A to measure regional brain AChE activity. We performed anatomical standardization of each brain image, and k3 values, an index of AChE activity, in each voxel were estimated by nonlinear least squares analysis. Volumes of interest (VOIs) were identified on parametric k3 images in frontal, temporal, parietal and occipital cortices, and in anterior and posterior cingulate gyri (ACG and PCG). In each VOI, the differential diagnostic performance between AD and DLB of k3 values was assessed by area under the curve (AUC) of the receiver-operating characteristic. Voxel-based statistical analyses were also performed. RESULTS Mean cortical AChE activities in AD patients (-8.2% compared with normal mean) and DLB patients (-27.8%) were lower than HCs (p < 0.05, p < 0.001, respectively). There was a significant difference in mean cortical AChE activities between AD and DLB patients (p < 0.001). All regional brain AChE activities of defined VOIs except ACG were able to well discriminate DLB from AD, and notably performance was the most significant in PCG (AUC = 0.989, 95% CI: 0.965-1.000). CONCLUSIONS Brain cholinergic deficit is consistently prominent in DLB compared with AD. PET measurement of brain AChE activity may be useful for the differential diagnosis between DLB and AD.
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Sakiyama Y, Shibata S, Sanayama H, Ono S, Maekawa M, Matsuo M, Irie T, Eto Y. Intrathecal 2-Hydroxypropyl-Beta-Cyclodextrin (HPBCD) therapy in adult-onset Niemann-Pick Disease Type C (NPC). J Neurol Sci 2015. [DOI: 10.1016/j.jns.2015.08.719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Ichikawa Y, Watahiki J, Nampo T, Nose K, Yamamoto G, Irie T, Mishima K, Maki K. Differences in the developmental origins of the periosteum may influence bone healing. J Periodontal Res 2014; 50:468-78. [PMID: 25225160 DOI: 10.1111/jre.12229] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/20/2014] [Indexed: 12/21/2022]
Abstract
BACKGROUND AND OBJECTIVE The jaw bone, unlike most other bones, is derived from neural crest stem cells, so we hypothesized that it may have different characteristics to bones from other parts of the body, especially in the nature of its periosteum. The periosteum exhibits osteogenic potential and has received considerable attention as a grafting material for the repair of bone and joint defects. MATERIAL AND METHODS Gene expression profiles of jaw bone and periosteum were evaluated by DNA microarray and real-time polymerase chain reaction. Furthermore, we perforated an area 2 mm in diameter on mouse frontal and parietal bones. Bone regeneration of these calvarial defects was evaluated using microcomputed tomography and histological analysis. RESULTS The DNA microarray data revealed close homology between the gene expression profiles within the ilium and femur. The gene expression of Wnt-1, SOX10, nestin, and musashi-1 were significantly higher in the jaw bone than in other locations. Microcomputed tomography and histological analysis revealed that the jaw bone had superior bone regenerative abilities than other bones. CONCLUSION Jaw bone periosteum exhibits a unique gene expression profile that is associated with neural crest cells and has a positive influence on bone regeneration when used as a graft material to repair bone defects. A full investigation of the biological and mechanical properties of jaw bone as an alternative graft material for jaw reconstructive surgery is recommended.
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Ochiai T, Shioya A, Honma H, Saitoh Y, Matsumura S, Ban D, Irie T, Kudo A, Nakamura N, Fujikawa T, Itai A, Tanaka S, Arii S, Yamaoka S, Tanabe M. Combination Treatment of IκB Kinase β Inhibitor IMD-0354 and Gemcitabine Suppresses Oncogenic Proliferation of Pancreatic Cancer Cells. J Surg Res 2014. [DOI: 10.1016/j.jss.2013.11.157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Kaneko Y, Nakajima T, Irie T, Ota M, Iijima T, Tamura M, Iizuka T, Tamura S, Saito A, Kurabayashi M. Initial shortening of the tachycardia cycle length after the induction of fast-slow atrioventricular nodal reentrant tachycardia may support slow pathway as an antegrade limb of the reentry circuit. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht310.p4969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Hayashi S, Tanaka J, Okada S, Isobe T, Yamamoto G, Yasuhara R, Irie T, Akiyama C, Kohno Y, Tachikawa T, Mishima K. Lin28a is a putative factor in regulating cancer stem cell-like properties in side population cells of oral squamous cell carcinoma. Exp Cell Res 2013; 319:1220-8. [PMID: 23500413 DOI: 10.1016/j.yexcr.2013.03.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2013] [Revised: 02/24/2013] [Accepted: 03/02/2013] [Indexed: 01/06/2023]
Abstract
Cancer stem cells (CSCs) are among the target cells of cancer therapy because they are uniquely involved in both cancer progression and sensitivity to chemotherapeutic agents. We identified side population (SP) cells, which are known to be an enriched population of CSC, in five oral squamous cell carcinoma (OSCC) cells (SCC9, SCC25, TOSCC7, TOSCC17, and TOSCC23). The percentages of SP cells ranged from 0% to 3.3%, with TOSCC23 cells showing the highest percentages of SP cells (3.3% of the total cell population). The SP cells isolated from TOSCC23 cells also showed greater cell proliferation and invasion compared to non-SP (MP) cells. Therefore, our initial findings suggested that SP cells were enriched for CSC-like cells. Furthermore, DNA microarray analysis revealed that the expression of cell proliferation-related and anti-apoptotic genes was greater in SP cells compared to MP cells. We focused on Lin28a, which showed the highest expression (approximately 22-fold) among the upregulated genes. The overexpression of Lin28a in TOSCC23 cells increased their proliferation, colony formation, and invasion. These findings suggest that Lin28a is an appropriate CSC target molecule for OSCC treatment.
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Zhang MR, Tsuchiyama A, Haradahira T, Yoshida Y, Irie T, Suzuki K. An automated synthesis of [18F]Fluoroethyl bromide by distillation and its application to the synthesis of [18F]Fluoroethyl-P4A, a pet tracer for measurement of acetylcholinesterase activity. J Labelled Comp Radiopharm 2012. [DOI: 10.1002/jlcr.25804401310] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Shimada H, Hirano S, Shinotoh H, Aotsuka A, Sato K, Tanaka N, Ota T, Asahina M, Fukushi K, Kuwabara S, Irie T, Ito H, Suhara T. 2.021 DEMENTIA WITH LEWY BODIES CAN BE WELL-DIFFERENTIATED FROM ALZHEIMER'S DISEASE BY MEASUREMENT OF BRAIN ACETYLCHOLIN ESTERASE ACTIVITY BY PET. Parkinsonism Relat Disord 2012. [DOI: 10.1016/s1353-8020(11)70454-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Miyagawa T, Ishikawa S, Ichioka D, Emura M, Kojima T, Tsutsumi M, Irie T, Kondou M, Mitake T. UP-02.133 Real-time Virtual Sonography for Prostate-Targeted Biopsy Based on MRI Data: Evaluation of Accuracy with Resected Specimens. Urology 2011. [DOI: 10.1016/j.urology.2011.07.951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Uekama K, Adachi H, Irie T, Yano T, Saita M, Noda K. Improved transdermal delivery of prostaglandin E1 through hairless mouse skin: combined use of carboxymethyl-ethyl-β-cyclodextrin and penetration enhancers. J Pharm Pharmacol 2011; 44:119-21. [PMID: 1352811 DOI: 10.1111/j.2042-7158.1992.tb03574.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Abstract
The optimal prescription of transdermal preparations of prostaglandin E1 (PGE1) for treatment of peripheral vascular diseases has been investigated. The chemical stability of PGE1 in fatty alcohol/propylene glycol (FAPG) ointment was markedly improved by carboxymethyl-ethyl-β-cyclodextrin (CME-β-CyD). Application of a PGE1 ointment containing the penetration enhancer, 1-dodecylazacycloheptane-2-one (Azone) or 1-[2-(decylthio)ethyl]azacyclopentane-2-one (HPE-101), onto the skin of hairless mice showed the increase of blood flow in the skin due to the vasodilating action of PGE1. In particular, the ointment containing a PGE1-CME-β-CyD complex supplemented with HPE-101 showed the most prominent increase of the blood flow. Compared with other ointments, this ointment was found to show significantly greater transfer of HPE-101 into in-vitro preparations of the skin of hairless mice. Transfer of PGE1 into the skin was thought to be facilitated by this increased transfer of HPE-101. These results suggest that a combination of CME-β-CyD and HPE-101 is useful for designing PGE1 ointments for topical application with good chemical stability and percutaneous permeability.
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Toru S, Matumura K, Kawaguchi R, Kobayashi T, Irie T. Widespread cortical lesions on diffusion-weighted imaging in acute portal systemic shunt encephalopathy caused by primary biliary cirrhosis. AJNR Am J Neuroradiol 2011; 32:E55-6. [PMID: 21233224 DOI: 10.3174/ajnr.a2466] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Okamura T, Kikuchi T, Irie T. PET imaging of MRP1 function in the living brain: method development and future perspectives. Curr Top Med Chem 2011; 10:1810-9. [PMID: 20645911 DOI: 10.2174/156802610792927988] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2010] [Accepted: 01/20/2010] [Indexed: 11/22/2022]
Abstract
Multidrug resistance-associated protein 1 (MRP1) functions as a primary active transporter utilizing energy from ATP hydrolysis. In the central nervous system (CNS), MRP1 plays an important role in limiting the permeation of xenobiotic and endogenous substrates across the blood-brain and blood-cerebrospinal fluid barriers, and across brain parenchymal cells. While MRP1 contributes to minimizing the neurotoxic effects of drugs, it may also restrict the distribution of drugs for the treatment of CNS diseases. Moreover, neurodegenerative disease may be associated with abnormal expression of efflux transporters in the brain. Noninvasive measurement of MRP1 function will therefore be useful for directly evaluating the effect of modulators on enhancing the penetration of drugs into the brain and for examining the pathophysiological role of MRP1 in the brain. Positron emission tomography (PET) is a powerful molecular imaging technique. While several PET probes have been proposed for imaging function of the efflux transporter P-glycoprotein, few reports discuss the probes for imaging MRP1 function in the brain. Ideally, brain radioactivity should consist of a single radioactive compound that is selectively transported by the efflux transporter of interest, without other efflux routes. However, most PET probes for MRP1 or P-glycoprotein are eliminated by both a transporter and simple diffusion, resulting in inaccurate measurement of pump function. This review addresses a new strategy to avoid this problem, and suggests the design of a PET probe based on this strategy, particularly for MRP1 imaging. Several published reports on imaging MRP1 function with PET are also discussed.
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Arii S, Tanaka S, Mitsunori Y, Nakamura N, Kudo A, Noguchi N, Irie T. Surgical Strategies for Hepatocellular Carcinoma with Special Reference to Anatomical Hepatic Resection and Intraoperative Contrast-Enhanced Ultrasonography. Oncology 2010; 78 Suppl 1:125-30. [DOI: 10.1159/000315240] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Suzuki M, Yasui K, Ishikawa H, Nomura M, Watanabe T, Mikami H, Yamazaki T, Irie T, Yamano T, Ono S. FP57-FR-06 Increased neurotrophin-3 of skin in amyotrophic lateral sclerosis: an immunohistochemical study. J Neurol Sci 2009. [DOI: 10.1016/s0022-510x(09)70574-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Shimada H, Hirano S, Shinotoh H, Aotsuka A, Sato K, Tanaka N, Ota T, Asahina M, Fukushi K, Kuwabara S, Hattori T, Suhara T, Irie T. Mapping of brain acetylcholinesterase alterations in Lewy body disease by PET. Neurology 2009; 73:273-8. [PMID: 19474411 DOI: 10.1212/wnl.0b013e3181ab2b58] [Citation(s) in RCA: 227] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
OBJECTIVE To characterize brain cholinergic deficits in Parkinson disease (PD), PD with dementia (PDD), and dementia with Lewy bodies (DLB). METHODS Participants included 18 patients with PD, 21 patients with PDD/DLB, and 26 healthy controls. The PD group consisted of nine patients with early PD, each with a disease duration of less than 3 years, five of whom were de novo PD patients, and nine patients with advanced PD, each with a disease duration greater than or equal to 3 years. The PDD/DLB group consisted of 10 patients with PDD and 11 patients with DLB. All subjects underwent PET scans with N-[11C]-methyl-4-piperidyl acetate to measure brain acetylcholinesterase (AChE) activity. Brain AChE activity levels were estimated voxel-by-voxel in a three-compartment analysis using the arterial input function, and compared among our subject groups through both voxel-based analysis using the statistical parametric mapping software SPM5 and volume-of-interest analysis. RESULTS Among patients with PD, AChE activity was significantly decreased in the cerebral cortex and especially in the medial occipital cortex (% reduction compared with the normal mean = -12%) (false discovery rate-corrected p value <0.01). Patients with PDD/DLB, however, had even lower AChE activity in the cerebral cortex (% reduction = -27%) (p < 0.01). There was no significant difference between early PD and advanced PD groups or between DLB and PDD groups in the amount by which regional AChE activity in the brain was reduced. CONCLUSIONS Brain cholinergic dysfunction occurs in the cerebral cortex, especially in the medial occipital cortex. It begins in early Parkinson disease, and is more widespread and profound in both Parkinson disease with dementia and dementia with Lewy bodies.
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Ishikawa S, Miyagawa T, Kimura T, Suetomi T, Tsutsumi M, Irie T, Kondoh M, Arai O, Mitake T. POD-5.05: Prostate-Targeted Biopsy Navigated by Real-time Virtual Sonography Acquired from MRI Volume Data. Urology 2008. [DOI: 10.1016/j.urology.2008.08.106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Hashino S, Morioka M, Irie T, Shiroshita N, Kawamura T, Suzuki S, Iwasaki H, Umehara S, Kakinoki Y, Kurosawa M, Kahata K, Izumiyama K, Kobayashi H, Onozawa M, Takahata M, Fujisawa F, Kondo T, Asaka M. Cost benefit and clinical efficacy of low-dose granulocyte colony-stimulating factor after standard chemotherapy in patients with non-Hodgkin's lymphoma. Int J Lab Hematol 2008; 30:292-9. [PMID: 18665826 DOI: 10.1111/j.1751-553x.2007.00955.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
High costs of molecule-targeted drugs, such as rituximab, ibritumomab, and tositumomab have given rise to an economical issue for treating patients with non-Hodgkin's lymphoma (NHL). Granulocyte colony-stimulating factors (G-CSFs), which are also expensive, are widely used for treating neutropenia after chemotherapy. In Japan, lenograstim at 2 microg/kg (about 100 microg/body) or filgrastim at 50 microg/m(2) (about 75 microg/body) is commonly administered for patients with NHL after chemotherapy. Therefore, cost-effectiveness is an important issue in treatment for NHL. Patients with advanced-stage NHL who needed chemotherapy with cyclophosphamide, doxorubicin, vincristine, and prednisone (CHOP) or a CHOP-like regimen with or without rituximab were enrolled in this randomized cross-over trial to investigate the efficacy and safety of low-dose G-CSF. Half of the patients were administered 75 microg filgrastim in the first course after neutropenia and 50 microg lenograstim in the second course, and the other half were crossed over. Forty-seven patients were enrolled in this cross-over trial, and 24 patients completed the trial. Frequencies and durations of grade 4 leukocytopenia and neutropenia were similar in the two groups. Severe infection was rare and was observed at similar frequency. Frequencies of antibiotics use were also similar. The total cost of G-CSF (cost/drug x duration of administration) was significantly lower in patients who received 50 microg lenograstim. Hence, a low dose of lenograstim might be safe, effective and pharmaco-economically beneficial in patients with advanced-stage NHL.
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Kambayashi T, Irie T, Nakatsukasa H, Takaki Y. [Lung abscess which ruptured during the medical treatment of lung abscess; report of a case]. KYOBU GEKA. THE JAPANESE JOURNAL OF THORACIC SURGERY 2008; 61:254-257. [PMID: 18323196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
63-year-old man was admitted to our hospital with fever and cough for about 2 months. Laboratory data showed marked inflammatory changes, and chest computed tomography (CT) scans revealed right-sided hydrothorax, atelectasis of the right middle lobe, and a cystic mass in the right middle lobe. We diagnosed the patients as having lung abscess and empyema. Following the intravenous antibiotic chemotherapy, symptoms and laboratory data showed the improvement, however, on the 11th hospital day, he developed high fever again. A chest CT showed pneumopyothorax suggesting the rupture of lung abscess. Since the chest tube drainage was ineffective, open chest surgery was performed. Curettage of both thoracic and abscess cavity with closure of air leakage successfully cured the pyothorax.
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Seki C, Tokunaga M, Hattori S, Shidahara M, Nakao R, Maeda J, Toyama H, Irie T, Higuchi M, Suhara T, Kanno I, Kimura Y. Quantification of 11C-PIB kinetics in mouse brain using metabolite-corrected arterial input function. Neuroimage 2008. [DOI: 10.1016/j.neuroimage.2008.04.206] [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] Open
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Majima T, Irie T, Sawaguchi N, Funakoshi T, Iwasaki N, Harada K, Minami A, Nishimura SI. Chitosan-based hyaluronan hybrid polymer fibre scaffold for ligament and tendon tissue engineering. Proc Inst Mech Eng H 2007; 221:537-46. [PMID: 17822155 DOI: 10.1243/09544119jeim203] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
To establish medical use of tissue engineering technology for ligament and tendon injuries, a scaffold was developed which has sufficient ability for cell growth, cell differentiation, and mechanical properties. The scaffold made from chitosan and 0.1 per cent hyaluronic acid has adequate biodegradability and biocompatibility. An animal experiment showed that the scaffold has less toxicity and less inflammation induction. Furthermore, in-vivo animal experiments showed that the mechanical properties of the engineered ligament or tendon had the possibility to stabilize the joint. It was shown that newly developed hybrid-polymer fibre scaffold has feasibility for joint tissue engineering.
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Kato K, Uruga T, Tanida H, Yokota S, Okumura K, Imai Y, Irie T, Yamakata Y. Time-Resolved Energy-Dispersive XAFS Station for Wide-Energy Range at SPring-8. ACTA ACUST UNITED AC 2007. [DOI: 10.1063/1.2436282] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Uruga T, Tanida H, Inoue K, Yamazaki H, Irie T. Quick XAFS System using Quasimonochromatic Undulator Radiation at SPring-8. ACTA ACUST UNITED AC 2007. [DOI: 10.1063/1.2644703] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Crouzel C, Venet M, Irie T, Sanz G, Boullais C. Labeling of a serotoninergic ligand with 18F : [18F] setoperone. J Labelled Comp Radiopharm 2006. [DOI: 10.1002/jlcr.2580250407] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Hirano S, Shinotoh H, Kobayashi T, Tsuboi Y, Wszolek ZK, Aotsuka A, Tanaka N, Ota T, Fukushi K, Tanada S, Irie T. Brain acetylcholinesterase activity in FTDP-17 studied by PET. Neurology 2006; 66:1276-7. [PMID: 16636254 DOI: 10.1212/01.wnl.0000208515.50924.94] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Irie T, Aizawa T, Kokubun S. The role of sex hormones in the kinetics of chondrocytes in the growth plate. ACTA ACUST UNITED AC 2005; 87:1278-84. [PMID: 16129759 DOI: 10.1302/0301-620x.87b9.15583] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Sex hormones play important roles in the regulation of the proliferation, maturation and death of chondrocytes in the epiphyseal growth plate. We have investigated the effects of male castration on the cell kinetics of chondrocytes as defined by the numbers of proliferating and dying cells. The growth plates of normal rabbits and animals castrated at eight weeks of age were obtained at 10, 15, 20 and 25 weeks of age. Our study suggested that castration led to an increase in apoptosis and a decrease in the proliferation of chondrocytes in the growth plate. In addition, the number of chondrocytes in the castrated rabbits was less than that of normal animals of the same age.
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