1
|
Ueda R, Hashimoto R, Fujii Y, Menezes JCJMDS, Takahashi H, Takeda H, Sawasaki T, Motokawa T, Tokunaga K, Fujita H. Membrane-Associated Ubiquitin Ligase RING Finger Protein 152 Orchestrates Melanogenesis via Tyrosinase Ubiquitination. MEMBRANES 2024; 14:43. [PMID: 38392670 PMCID: PMC10890620 DOI: 10.3390/membranes14020043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 01/24/2024] [Accepted: 01/27/2024] [Indexed: 02/24/2024]
Abstract
Lysosomal degradation of tyrosinase, a pivotal enzyme in melanin synthesis, negatively impacts melanogenesis in melanocytes. Nevertheless, the precise molecular mechanisms by which lysosomes target tyrosinase have remained elusive. Here, we identify RING (Really Interesting New Gene) finger protein 152 (RNF152) as a membrane-associated ubiquitin ligase specifically targeting tyrosinase for the first time, utilizing AlphaScreen technology. We observed that modulating RNF152 levels in B16 cells, either via overexpression or siRNA knockdown, resulted in decreased or increased levels of both tyrosinase and melanin, respectively. Notably, RNF152 and tyrosinase co-localized at the trans-Golgi network (TGN). However, upon treatment with lysosomal inhibitors, both proteins appeared in the lysosomes, indicating that tyrosinase undergoes RNF152-mediated lysosomal degradation. Through ubiquitination assays, we found the indispensable roles of both the RING and transmembrane (TM) domains of RNF152 in facilitating tyrosinase ubiquitination. In summary, our findings underscore RNF152 as a tyrosinase-specific ubiquitin ligase essential for regulating melanogenesis in melanocytes.
Collapse
|
2
|
Miyazaki A, Taguchi H, Watanabe S, Ogata K, Nagatomi Y, Ueda R, Shimizu K, Hirao T. [Applicability of Qualitative Real-Time PCR Methods for Detecting Wheat, Buckwheat, and Peanut in Processed Food]. SHOKUHIN EISEIGAKU ZASSHI. JOURNAL OF THE FOOD HYGIENIC SOCIETY OF JAPAN 2023; 64:34-46. [PMID: 36858590 DOI: 10.3358/shokueishi.64.34] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/03/2023]
|
3
|
Ueda R, Koizumi T, Mizuno T, Nakagawa M. [Neuronal intranuclear inclusion disease in a patient who exhibited abnormal behavior]. Rinsho Shinkeigaku 2022; 62:369-374. [PMID: 35474285 DOI: 10.5692/clinicalneurol.cn-001689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
A 63-year-old woman with no medical history of note developed acute-onset abnormal behavior persisting for one week. Mild disturbance of consciousness was noted on physical examination. Her blood and spinal fluid test results were normal. On brain MRI, diffusion-weighted image showed a high-intensity signal in U-fiber areas of the bilateral frontal lobes, and fluid-attenuated inversion recovery showed white matter lesions. We suspected neuronal intranuclear inclusion disease (NIID) based on brain MRI findings; therefore, we performed a skin biopsy and genetic test. Pathological findings of the skin biopsy revealed the presence of anti-p62-positive intranuclear inclusion bodies in fibroblasts and adipocytes. The genetic test showed GGC repeat expansion of NOTCH2NLC, but no mutation of FMR1. Thus, we diagnosed her with NIID. The acute-onset abnormal behavior was improved by levetiracetam. The present case indicates that patients with a high-intensity area in the corticomedullary junction should undergo a skin biopsy, even though they may present with non-specific symptoms such as acute-onset abnormal behavior.
Collapse
|
4
|
Ueda R, Imai K, Yamamoto A, Ioku T, Kadoya M, Hamanaka M. [Eosinophilic granulomatosis with polyangiitis presenting with Guillain-Barré syndrome-like acute course. A case report]. Rinsho Shinkeigaku 2021; 61:624-629. [PMID: 34433743 DOI: 10.5692/clinicalneurol.cn-001601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
A 57-years-old man with a history of bronchial asthma and pansinusitis developed acute progressive muscle weakness and sensory disturbance of the distal limbs after upper respiratory infection. On day 15 after onset of sensory disturbance and muscle weakness, the patient admitted to our hospital. A neurological examination revealed asymmetry weakness of both proximal and distal muscles, "glove and stocking type" hypoesthesia, and paresthesia without obvious pain. Blood tests and a nerve conduction study demonstrated eosinophilia and elevation of MPO-ANCA, axonal multiple mononeuropathy, respectively. The cerebrospinal fluid was normal. Eosinophilic granulomatosis with polyangiitis (EGPA) or Guillain-Barré syndrome (GBS) were suspected. So intravenous immunoglobulin therapy (IVIg) and high dose methylprednisolone pulse therapy (HDMP) followed by oral prednisolone were started. However, neurological symptoms did not improve. Sural nerve biopsy on day 31 revealed varying myelinating fiber loss at every nerve bundle and perivascular lymphocytic infiltration. The results did not fulfill the pathologic criteria for EGPA, but supported the changes of vasculitis. Cyclophosphamide (CPA) pulse therapy was administered for the additional therapy. Neurological symptoms did not improve and worsened again after decreasing oral prednisolone; therefore, combined therapy with IVIg, HDMP, and CPA was administered. Neurological symptoms then diminished gradually and the MPO-ANCA level and number of eosinophils normalized. This case suggests the importance of early nerve biopsy to obtain pathological findings supportive of EGPA diagnosis to allow introduction of aggressive immunosuppressive therapy such as CPA in a case with acute progressive motor-sensory neuropathy due to EGPA mimicking GBS.
Collapse
|
5
|
Oti T, Satoh K, Uta D, Nagafuchi J, Tateishi S, Ueda R, Takanami K, Young LJ, Galione A, Morris JF, Sakamoto T, Sakamoto H. Oxytocin Influences Male Sexual Activity via Non-synaptic Axonal Release in the Spinal Cord. Curr Biol 2020; 31:103-114.e5. [PMID: 33125871 DOI: 10.1016/j.cub.2020.09.089] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 01/21/2020] [Accepted: 09/29/2020] [Indexed: 01/15/2023]
Abstract
Oxytocinergic neurons in the paraventricular nucleus of the hypothalamus that project to extrahypothalamic brain areas and the lumbar spinal cord play an important role in the control of erectile function and male sexual behavior in mammals. The gastrin-releasing peptide (GRP) system in the lumbosacral spinal cord is an important component of the neural circuits that control penile reflexes in rats, circuits that are commonly referred to as the "spinal ejaculation generator (SEG)." We have examined the functional interaction between the SEG neurons and the hypothalamo-spinal oxytocin system in rats. Here, we show that SEG/GRP neurons express oxytocin receptors and are activated by oxytocin during male sexual behavior. Intrathecal injection of oxytocin receptor antagonist not only attenuates ejaculation but also affects pre-ejaculatory behavior during normal sexual activity. Electron microscopy of potassium-stimulated acute slices of the lumbar cord showed that oxytocin-neurophysin-immunoreactivity was detected in large numbers of neurosecretory dense-cored vesicles, many of which are located close to the plasmalemma of axonal varicosities in which no electron-lucent microvesicles or synaptic membrane thickenings were visible. These results suggested that, in rats, release of oxytocin in the lumbar spinal cord is not limited to conventional synapses but occurs by exocytosis of the dense-cored vesicles from axonal varicosities and acts by diffusion-a localized volume transmission-to reach oxytocin receptors on GRP neurons and facilitate male sexual function.
Collapse
|
6
|
Ogawa Y, Naganuma A, Inagawa M, Iida T, Kimura M, Kumakura A, Yoshida T, Yamai N, Moroboshi A, Ueda R, Kawahara Y, Itou N, Shiozawa Y, Koyama Y, Funakoshi H, Manome M, Noguchi K, Kanai M, Ishiguro K, Ogawa T, Ishihara H. Effect of video endoscopic examination of swallowing function early after admission on length of hospital stay for patients with acute cerebral infarction: A retrospective study. Clin Nutr 2018. [DOI: 10.1016/j.clnu.2018.06.1150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
7
|
Kurose K, Ohue Y, Isobe M, Suzuki S, Wada H, Ueda R, Nakayama E, Oka M. P2.07-015 Reviving Chemotherapy Sensitivity after Anti-CCR4 mAb (Mogamulizumab) Treatment in Lung Cancer Patients. J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.11.074] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
8
|
Hagiwara A, Hori M, Yokoyama K, Nakazawa M, Ueda R, Horita M, Andica C, Abe O, Aoki S. Analysis of White Matter Damage in Patients with Multiple Sclerosis via a Novel In Vivo MR Method for Measuring Myelin, Axons, and G-Ratio. AJNR Am J Neuroradiol 2017; 38:1934-1940. [PMID: 28775058 PMCID: PMC7963610 DOI: 10.3174/ajnr.a5312] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 05/24/2017] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Myelin and axon volume fractions can now be estimated via MR imaging in vivo, as can the g-ratio, which equals the ratio of the inner to the outer diameter of a nerve fiber. The purpose of this study was to evaluate WM damage in patients with MS via this novel MR imaging technique. MATERIALS AND METHODS Twenty patients with relapsing-remitting MS with a combined total of 149 chronic plaques were analyzed. Myelin volume fraction was calculated based on simultaneous tissue relaxometry. Intracellular and CSF compartment volume fractions were quantified via neurite orientation dispersion and density imaging. Axon volume fraction and g-ratio were calculated by combining these measurements. Myelin and axon volume fractions and g-ratio were measured in plaques, periplaque WM, and normal-appearing WM. RESULTS All metrics differed significantly across the 3 groups (P < .001, except P = .027 for g-ratio between periplaque WM and normal-appearing WM). Those in plaques differed most from those in normal-appearing WM. The percentage changes in plaque and periplaque WM metrics relative to normal-appearing WM were significantly larger in absolute value for myelin volume fraction than for axon volume fraction and g-ratio (P < .001, except P = .033 in periplaque WM relative to normal-appearing WM for comparison between myelin and axon volume fraction). CONCLUSIONS In this in vivo MR imaging study, the myelin of WM was more damaged than axons in plaques and periplaque WM of patients with MS. Myelin and axon volume fractions and g-ratio may potentially be useful for evaluating WM damage in patients with MS.
Collapse
|
9
|
Ogawa Y, Naganuma A, Inagawa M, Iida T, Kimura M, Kumakura A, Yoshida T, Nakamura H, Moroboshi A, Ueda R, Kawahara Y, Sekine S, Shiozawa Y, Koyama Y, Funakoshi H, Tanaka H, Kanai M, Ishiguro K, Ogawa T, Ishihara H. MON-P026: Early Evaluation of the Swallowing Function Can Shorten Hospitalisation Period for Patients with Acute Cerebral infarction: A Historical Control Study. Clin Nutr 2017. [DOI: 10.1016/s0261-5614(17)31057-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
10
|
Masaki A, Ishida T, Maeda Y, Narita T, Ito A, Suzuki S, Ri M, Kusumoto S, Komatsu H, Choi I, Suehiro Y, Inagaki H, Ueda R, Iida S. Prognostic significance of tryptophan catabolism in newly diagnosed Hodgkin lymphoma. Hematol Oncol 2017. [DOI: 10.1002/hon.2439_44] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
11
|
Phan U, Ueda R, Mangadu R, Sathe M, Rimmer E, Vives F, Ayanoglu G, Yu Y, Wong J, Sadekova S, McClanahan T, Bhagwat B, Willingham A, Raubertas R, Kastelein R. Development of the anti-IL-10 mAb MK-1966 in combination with in situ vaccination of a TLR9 agonist SD-101 for cancer immunotherapy. Eur J Cancer 2016. [DOI: 10.1016/s0959-8049(16)32870-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
12
|
Hoshino S, Ishiwata T, Ueda R. Optimal patrolling methodology of mobile robot for unknown visitors. Adv Robot 2016. [DOI: 10.1080/01691864.2016.1192064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
13
|
Brunn ND, Mauze S, Gu D, Wiswell D, Ueda R, Hodges D, Beebe AM, Zhang S, Escandon E. The Role of Anti-Drug Antibodies in the Pharmacokinetics, Disposition, Target Engagement, and Efficacy of a GITR Agonist Monoclonal Antibody in Mice. ACTA ACUST UNITED AC 2015; 356:574-86. [DOI: 10.1124/jpet.115.229864] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Accepted: 12/14/2015] [Indexed: 12/17/2022]
|
14
|
Maie K, Fuji S, Tajima K, Tatsuno M, Yamagata S, Takahashi N, Ueda R, Hashimoto H, Takano K, Inoue Y, Ito A, Hayashi Y, Okinaka K, Kurosawa S, Kim SW, Tanosaki R, Heike Y, Yamashita T, Fukuda T. A higher number of infused CD34(+) cells has a positive impact on the clinical outcome after related PBSC transplantation. Bone Marrow Transplant 2014; 49:1113-5. [PMID: 24797181 DOI: 10.1038/bmt.2014.94] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
15
|
Banno S, Matsumoto Y, Hayami Y, Sugiura Y, Yoshinouchi T, Ueda R. Pulmonary AL amyloidosis in a patient with primary Sjögren syndrome. Mod Rheumatol 2014; 12:84-8. [PMID: 24383839 DOI: 10.3109/s101650200015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract The condition of a 29-year-old woman with primary Sjögren syndrome (SS) was complicated by amyloid light chains- (AL-) type amyloidosis in the paranasal sinus. She had not complained of respiratory symptoms, but her chest computed tomography (CT) scan revealed bilateral multiple nodular shadows. Lung biopsy specimens using video-associated thoracoscopy showed amyloidoma in a subpleural nodular lesion and amyloid deposits in the interstitial parenchymal walls and pulmonary vessels. Pulmonary AL amyloidosis, presumably related to a chronic inflammatory lymphoproliferative process in SS, has rarely been reported.
Collapse
|
16
|
Banno S, Sugiura Y, Yoshinouchi T, Matsumoto Y, Ueda R. Successful treatment of reactive hemophagocytic syndrome by plasmapheresis and high-dose γ-globulin in a patient with systemic lupus erythematosus. Mod Rheumatol 2014; 10:263-6. [PMID: 24383641 DOI: 10.3109/s101650070014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract A 31-year-old woman who had been administered corticosteroid and immunosuppressive agents for systemic lupus erythematosus (SLE) without flare-up was diagnosed as having reactive hemophagocytic syndrome (HPS) with severe disseminated intravascular coagulation. The causative underlying disease was uncertain, but it was not the SLE itself. Her fulminant HPS with increased serum ferritin and inflammatory cytokines (sIL-2R, TNF-α, IL-6, and IFN-γ) was successfully treated with plasmapheresis and high-dose γ-globulin therapy.
Collapse
|
17
|
Ueda R, Maruyama D, Maeshima A, Miyamoto K, Fukuhara S, Kim SW, Watanabe T, Kobayashi Y, Taniguchi H, Tobinai K. Testicular and Leptomeningeal Relapse as Myeloid Sarcoma in a Patient Initially Diagnosed with T Lymphoblastic Lymphoma. Ann Oncol 2013. [DOI: 10.1093/annonc/mdt460.115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
18
|
Hatake K, Ogura M, Ishida T, Taniwaki M, Ando K, Tobinai K, Yamamoto K, Tsukasaki K, Tomonaga M, Ueda R. A Multicenter Phase II Study of Mogamulizumab (KW-0761) in Patients with Relapsed Peripheral or Cutaneous T-Cell Lymphoma. Ann Oncol 2013. [DOI: 10.1093/annonc/mdt459.25] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
|
19
|
De Graeve FM, Van de Bor V, Ghiglione C, Cerezo D, Jouandin P, Ueda R, Shashidhara LS, Noselli S. Drosophila apc regulates delamination of invasive epithelial clusters. Dev Biol 2012; 368:76-85. [PMID: 22627290 DOI: 10.1016/j.ydbio.2012.05.017] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2011] [Revised: 05/09/2012] [Accepted: 05/14/2012] [Indexed: 11/17/2022]
Abstract
Border Cells in the Drosophila ovaries are a useful genetic model for understanding the molecular events underlying epithelial cell motility. During stage 9 of egg chamber development they detach from neighboring stretched cells and migrate between the nurse cells to reach the oocyte. RNAi screening allowed us to identify the dapc1 gene as being critical in this process. Clonal and live analysis showed a requirement of dapc1 in both outer border cells and contacting stretched cells for delamination. This mutant phenotype was rescued by dapc1 or dapc2 expression. Loss of dapc1 function was associated with an abnormal lasting accumulation of β-catenin/Armadillo and E-cadherin at the boundary between migrating border and stretched cells. Moreover, β-catenin/armadillo or E-cadherin downregulation rescued the dapc1 loss of function phenotype. Altogether these results indicate that Drosophila Apc1 is required for dynamic remodeling of β-catenin/Armadillo and E-cadherin adhesive complexes between outer border cells and stretched cells regulating proper delamination and invasion of migrating epithelial clusters.
Collapse
|
20
|
Ohmachi K, Tobinai K, Kobayashi Y, Itoh K, Nakata M, Shibata T, Morishima Y, Ogura M, Suzuki T, Ueda R, Aikawa K, Nakamura S, Fukuda H, Shimoyama M, Hotta T. Phase III trial of CHOP-21 versus CHOP-14 for aggressive non-Hodgkin’s lymphoma: final results of the Japan Clinical Oncology Group Study, JCOG 9809. Ann Oncol 2011; 22:1382-1391. [DOI: 10.1093/annonc/mdq619] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
21
|
Ueda R, Nakatsuka A, Yamakado K, Yamanaka T, Kodama H, Takaki H, Kashima M, Uraki J, Inaba T, Takeda K. Abstract No. 198: Osteoporotic rabbit lumbar spine model following radiofrequency ablation: Evaluation of physical properties and micro CT-histopathologic correlation. J Vasc Interv Radiol 2011. [DOI: 10.1016/j.jvir.2011.01.218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
|
22
|
Fujita M, Kohanbash G, McDonald HA, Delamarre L, Decker SA, Ohlfest JR, Okada H, Okada H, Kalinski P, Ueda R, Hoji A, Kohanbash G, Donegan TE, Mintz AH, Engh JA, Bartlett DL, Brown CK, Zeh H, Holtzman MP, Reinhart TA, Whiteside TL, Butterfield LH, Hamilton RL, Potter DM, Pollack IF, Salazar AM, Lieberman FS, Olin MR, Andersen BM, Grogan PT, Hunt M, Popescu FE, Xiong ZL, Seiler C, Forster CL, SantaCruz KS, Chen W, Blazar BR, Ohlfest JR, Hu J, Wheeler CJ, Phuphanich S, Rudnick J, Nuno M, Serrano N, Dantis J, Richardson J, Mazer M, Wang HQ, Chu R, Black KL, Yu J, Li YM, Vallera DA, Hall WA, Rudnick JD, Wheeler CJ, Phuphanich S, Chu RM, Mazer M, Wang H, Serrano N, Nuno M, Richardson J, Hu J, Black KL, Yu JS, Yang I, Han S, Tihan T, Wrensch M, Parsa AT, Li YM, Vallera DA, Hall WA, Andersen BM, Hunt MA, Gallardo JL, Seiler C, Pluhar GE, Ohlfest JR, Brown CE, Starr R, Martinez C, Bading J, Ressler JA, Badie B, Jensen MC, Glick RP, Ksendzovsky A, Zengou R, Polak P, Simonini V, Lichtor T, Feinstein D, Chow KK, Ahmed N, Salsman VS, Kew Y, Powell S, Grossman R, Heslop HE, Gottschalk S, Barnett FH, Marchetti V, Wang M, Johnson A, Scheppke L, Jacobson R, Nemerow G, Friedlander M, Ahmed N, Salsman V, Kew Y, Leen AM, Bollard CM, Powell S, Grossman R, Rooney C, Heslop HE, Gottschalk S, New PZ, Bollard CM, Salvoldo B, Heslop H. Immunotherapy. Neuro Oncol 2010. [DOI: 10.1093/neuonc/noq116.s5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
23
|
Ueda R, Okada M. Induction of pole cells in sterilized Drosophila embryos by injection of subcellular fraction from eggs. Proc Natl Acad Sci U S A 2010; 79:6946-50. [PMID: 16593252 PMCID: PMC347251 DOI: 10.1073/pnas.79.22.6946] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A subcellular fraction isolated from a homogenate of young Drosophila embryos was shown to be capable of inducing pole cells when injected into UV-sterilized Drosophila embryos. Most of the pole cell-inducing activity was recovered from the precipitate after centrifugation at 27,000 x g. The activity remained in this precipitate (called F-3 fraction hereafter) even after membranous structures were removed from it through centrifugation on a sucrose density gradient. Dialysis, lyophilization, and heating at 80 degrees C for 10 min did not inactivate the F-3 fraction. The pole cells, which were produced when the F-3 fraction was injected at the posterior pole of UV-sterilized embryos, did not develop into germ cells. Furthermore, the F-3 fraction was unable to induce pole cells when injected into the anterior region of the egg. These results can be explained by assuming that (i) pole cell formation and germ cell determination are controlled by different factors, (ii) pole cell formation requires at least two factors, which are normally localized in the posterior-pole cytoplasm, one of which is sensitive and one resistant to the UV dosage we used, and (iii) the subcellular fraction we obtained contains the UV-sensitive factor but not the UV-resistant factor.
Collapse
|
24
|
Ri M, Iida S, Nakashima T, Miyazaki H, Mori F, Ito A, Inagaki A, Kusumoto S, Ishida T, Komatsu H, Shiotsu Y, Ueda R. Bortezomib-resistant myeloma cell lines: a role for mutated PSMB5 in preventing the accumulation of unfolded proteins and fatal ER stress. Leukemia 2010; 24:1506-12. [PMID: 20555361 DOI: 10.1038/leu.2010.137] [Citation(s) in RCA: 135] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Bortezomib is an effective agent for treating multiple myeloma (MM). To investigate the underlying mechanisms associated with acquired resistance to this agent, we established two bortezomib-resistant MM cell lines, KMS-11/BTZ and OPM-2/BTZ, the 50% inhibitory concentration values of which were respectively 24.7- and 16.6-fold higher than their parental cell lines. No activation of caspase and BH3-only proteins such as Noxa was noted in bortezomib-resistant cells after exposure to the drug. The accumulation of polyubiquitinated proteins was reduced in bortezomib-resistant cells compared with the parental cells, associated with avoidance of catastrophic ER stress as assessed by downregulation of CHOP expression. These resistant MM cells have a unique point mutation, G322A, in the gene encoding the proteasome beta5 subunit (PSMB5), likely resulting in conformational changes to the bortezomib-binding pocket of this subunit. KMS-11 parental cells transfected to express mutated PSMB5 also showed reduced bortezomib-induced apoptosis compared with those expressing wild-type PSMB5 or the parental cells. Expression of mutated PSMB5 was associated with the prevention of the accumulation of unfolded proteins. Thus, a fraction of MM cells may acquire bortezomib resistance by suppressing apoptotic signals through the inhibition of unfolded protein accumulation and subsequent excessive ER stress by a mutation of the PSMB5 gene.
Collapse
|
25
|
Grass S, Iida S, Wikowicz A, Fadle N, Inagaki A, Preuss K, Ziepert M, Ueda R, Pfreundschuh M. Association of hyperphosphorylated paratarg-7, the first autosomal-dominantly inherited risk factor for hematological neoplasms, with MGUS and multiple myeloma in different ethnic groups. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.8111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
|