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Mita M, Feng Y, Piñon-Gonzalez VM, Elphick MR, Katayama H. Gonadotropic activity of a second relaxin-type peptide in starfish. Gen Comp Endocrinol 2023; 343:114369. [PMID: 37611673 DOI: 10.1016/j.ygcen.2023.114369] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 08/14/2023] [Accepted: 08/20/2023] [Indexed: 08/25/2023]
Abstract
In starfish, a relaxin-like gonad-stimulating peptide (RGP) acts as a gonadotropin that triggers gamete maturation and spawning. In common with other relaxin/insulin superfamily peptides, RGP consists of an A- and a B-chain, with cross-linkages mediated by one intra- and two inter-chain disulfide bonds. In this study, a second relaxin-like peptide (RLP2) was identified in starfish species belonging to the orders Valvatida, Paxillosida, and Forcipulatida. Like RGP, RLP2 precursors comprise a signal peptide and a C-peptide in addition to the A- and B-chains. However, a unique cysteine motif [CC-(3X)-C-(10X)-C] is present in the A-chain of RLP2, which contrasts with the cysteine motif in other members of the relaxin/insulin superfamily [CC-(3X)-C-(8X)-C]. Importantly, in vitro pharmacological tests revealed that Patiria pectinifera RLP2 (Ppe-RLP2) and Asterias rubens RLP2 (Aru-RLP2) trigger shedding of mature eggs from ovaries of P. pectinifera and A. rubens, respectively. Furthermore, the potencies of Ppe-RLP2 and Aru-RLP2 as gonadotropic peptides were similar to those of Ppe-RGP and Aru-RGP, respectively, and the effect of RLP2 exhibited partial species-specificity. These findings indicate that two relaxin-type peptides regulate spawning in starfish and therefore we propose that RGP and RLP2 are renamed RGP1 and RGP2, respectively.
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Affiliation(s)
- Masatoshi Mita
- Department of Biochemistry, Showa University School of Medicine, 1-5-8, Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan.
| | - Yuling Feng
- Queen Mary University of London, School of Biological & Behavioural Sciences, Mile End Road, London E1 4NS, UK
| | - Victor M Piñon-Gonzalez
- Queen Mary University of London, School of Biological & Behavioural Sciences, Mile End Road, London E1 4NS, UK
| | - Maurice R Elphick
- Queen Mary University of London, School of Biological & Behavioural Sciences, Mile End Road, London E1 4NS, UK
| | - Hidekazu Katayama
- Department of Bioengineering, School of Engineering, Tokai University, 4-1-1, Kitakaname, Hiratsuka, Kanagawa, 259-1292, Japan
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Feng Y, Piñon Gonzalez VM, Lin M, Egertová M, Mita M, Elphick MR. Localization of relaxin-like gonad-stimulating peptide expression in starfish reveals the gonoducts as a source for its role as a regulator of spawning. J Comp Neurol 2023; 531:1299-1316. [PMID: 37212624 PMCID: PMC10952978 DOI: 10.1002/cne.25496] [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: 01/19/2023] [Revised: 03/17/2023] [Accepted: 04/26/2023] [Indexed: 05/23/2023]
Abstract
Oocyte maturation and gamete release (spawning) in starfish are triggered by relaxin-like gonad-stimulating peptide (RGP), a neuropeptide that was first isolated from the radial nerve cords of these animals. Hitherto, it has generally been assumed that the radial nerve cords are the source of RGP that triggers spawning physiologically. To investigate other sources of RGP, here we report the first comprehensive anatomical analysis of its expression, using both in situ hybridization and immunohistochemistry to map RGP precursor transcripts and RGP, respectively, in the starfish Asterias rubens. Cells expressing RGP precursor transcripts were revealed in the ectoneural epithelium of the radial nerve cords and circumoral nerve ring, arm tips, tube feet, cardiac stomach, pyloric stomach, and, most notably, gonoducts. Using specific antibodies to A. rubens RGP, immunostaining was revealed in cells and/or fibers in the ectoneural region of the radial nerve cords and circumoral nerve ring, tube feet, terminal tentacle and other arm tip-associated structures, body wall, peristomial membrane, esophagus, cardiac stomach, pyloric stomach, pyloric caeca, and gonoducts. Our discovery that RGP is expressed in the gonoducts of A. rubens proximal to its gonadotropic site of action in the gonads is important because it provides a new perspective on how RGP may act as a gonadotropin in starfish. Thus, we hypothesize that it is the release of RGP from the gonoducts that triggers gamete maturation and spawning in starfish, while RGP produced in other parts of the body may regulate other physiological/behavioral processes.
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Affiliation(s)
- Yuling Feng
- School of Biological & Behavioural SciencesQueen Mary University of LondonLondonUK
| | | | - Ming Lin
- School of Biological & Behavioural SciencesQueen Mary University of LondonLondonUK
| | - Michaela Egertová
- School of Biological & Behavioural SciencesQueen Mary University of LondonLondonUK
| | - Masatoshi Mita
- Department of BiochemistryShowa University School of MedicineTokyoJapan
| | - Maurice R. Elphick
- School of Biological & Behavioural SciencesQueen Mary University of LondonLondonUK
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3
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Abstract
Starfish relaxin-like gonad-stimulating peptide (RGP) is the first identified peptide hormone with gonadotropin-like activity in invertebrates. RGP is a heterodimeric peptide, comprising A and B chains with disulfide cross-linkages. Although RGP had been named a gonad-stimulating substance (GSS), the purified peptide is a member of relaxin-type peptide family. Thus, GSS was renamed as RGP. The cDNA of RGP encodes not only the A and B chains, but also signal and C-peptides. After the rgp gene is translated as a precursor, mature RGP is produced by eliminating the signal and C-peptides. Hitherto, twenty-four RGP orthologs have been identified or predicted from starfish in the orders Valvatida, Forcipulatida, Paxillosida, Spinulosida, and Velatida. The molecular evolution of the RGP family is in good accordance with the phylogenetic taxonomy in Asteroidea. Recently, another relaxin-like peptide with gonadotropin-like activity, RLP2, was found in starfish. RGP is mainly present in the radial nerve cords and circumoral nerve rings, but also in the arm tips, the gonoducts, and the coelomocytes. RGP acts on ovarian follicle cells and testicular interstitial cells to induce the production of 1-methyladenine (1-MeAde), a starfish maturation-inducing hormone. RGP-induced 1-MeAde production is accompanied by an increase in intracellular cyclic AMP levels. This suggests that the receptor for RGP (RGPR) is a G protein-coupled receptor (GPCR). Two types of GPCRs, RGPR1 and RGPR2, have been postulated as candidates. Furthermore, 1-MeAde produced by RGP not only induces oocyte maturation, but also induces gamete shedding, possibly by stimulating the secretion of acetylcholine in the ovaries and testes. Thus, RGP plays an important role in starfish reproduction, but its secretion mechanism is still unknown. It has also been revealed that RGP is found in the peripheral adhesive papillae of the brachiolaria arms. However, gonads are not developed in the larvae before metamorphosis. It may be possible to discover new physiological functions of RGP other than gonadotropin-like activity.
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Affiliation(s)
- Masatoshi Mita
- Department of Biochemistry, Showa University School of Medicine, Hatanodai 8-5-1, Shinagawa-ku, Tokyo 142-8555, Japan
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Katayama H, Mita M. The C-terminally amidated relaxin-like gonad-stimulating peptide in the starfish Astropecten scoparius. Gen Comp Endocrinol 2023; 334:114226. [PMID: 36731602 DOI: 10.1016/j.ygcen.2023.114226] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 01/26/2023] [Accepted: 01/28/2023] [Indexed: 02/03/2023]
Abstract
A relaxin-like gonad-stimulating peptide (RGP) in starfish was the first identified invertebrate gonadotropin, consisting of A- and B-chain. Recently, an RGP ortholog (Asc-RGP) from Astropecten scoparius in the order Paxillosida was found to harbor an amidation signal (Gly-Arg) at the C-terminus of the B-chain (Mita et al., 2020a). Two cleavage sites were also predicted within the signal peptide of the Asc-RGP precursor. Thus, four kinds of analogs (Asc-RGP-NH2(S), Asc-RGP-GR(S), Asc-RGP- NH2(L), Asc-RGP-GR(L) were hypothesized as natural Asc-RGPs. To identify the natural Asc-RGP, an extract of radial nerve cords from A. scoparius was analyzed using reverse-phase high-performance liquid chromatography and MALDI-TOF-mass spectrometry. The molecular weight of Asc-RGP was 4585.3, and those of A- and B-chains were 2511.8 and 2079.8, respectively. This strongly suggests that natural RGP in A. scoparius is Asc-RGP-NH2(S). Asc-RGP-NH2(S) stimulated 1-methyladenine and cyclic AMP production in isolated ovarian follicle cells of A. scoparius. On the other hand, the concentrations of four synthetic Asc-RGP analogs required for the induction of spawning in 50% of ovarian fragments were almost the same. The size and C-terminal amidation of the B-chain might not be important for spawning-inducing activity. C-terminally amidated RGPs in the B-chain were also observed in other species of starfish belonging to the order Paxillosida, particularly the family Astropectinidae, but not the family Luidiidae.
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Affiliation(s)
- Hidekazu Katayama
- Department of Bioengineering, School of Engineering, Tokai University, 4-1-1, Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan
| | - Masatoshi Mita
- Department of Biochemistry, Showa University School of Medicine, 1-5-8, Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan.
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Mita M, Katayama H, Yamamoto K, Shibata Y, Kiyomoto M. A Relaxin-Like Gonad-Stimulating Peptide Appears in the Early Development of the Starfish Patiria pectinifera. Zoolog Sci 2023; 40:7-12. [PMID: 36744704 DOI: 10.2108/zs220058] [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] [Received: 07/13/2022] [Accepted: 11/13/2022] [Indexed: 01/18/2023]
Abstract
Relaxin-like gonad-stimulating peptide (RGP) is a hormone with gonadotropin-like activity in starfish. This study revealed that spawning inducing activity was detected in an extract of brachiolaria larvae of Patiria pectinifera. Spawning inducing activity in the extract was due to P. pectinifera RGP (PpeRGP), not 1-methyladenine. The expression of PpeRGP mRNA was also found in brachiolaria. Immunohistochemical observation with specific antibodies for PpeRGP showed that PpeRGP was distributed in the peripheral adhesive papilla of the brachiolaria arms. In contrast, PpeRGP was not detected in the adult rudiment or ciliary band regions, which are present in the neural system. These findings strongly suggest that RGP exists in the larvae before metamorphosis. Because gonads are not developed in starfish larvae, it seems likely that RGP plays another role other than gonadotropic action in the early development of starfish.
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Affiliation(s)
- Masatoshi Mita
- Department of Biochemistry, Showa University School of Medicine, Shinagawa-ku, Tokyo 142-8555, Japan,
| | - Hidekazu Katayama
- Department of Bioengineering, School of Engineering, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan
| | - Kazutoshi Yamamoto
- Department of Biology, Faculty of Education and Integrated Sciences, Center for Advanced Biomedical Sciences, Waseda University, Shinjuku-ku, Tokyo 162-8480, Japan
| | - Yasushi Shibata
- Department of Life and Health Science, Faculty of Life & Environmental Sciences, Teikyo University of Science, Uenohara, Yamanashi 409-0193, Japan
| | - Masato Kiyomoto
- Tateyama Marine Laboratory, Marine and Coastal Research Center, Ochanomizu University, Tateyama, Chiba 294-0301, Japan
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Mita M, Osugi T, Kawada T, Satake H, Katayama H, Kitamura T, Miura T, Miura C. Characterization and localization of relaxin-like gonad-stimulating peptide in the crown-of-thorns starfish, Acanthaster cf. solaris. Gen Comp Endocrinol 2022; 328:114107. [PMID: 35973586 DOI: 10.1016/j.ygcen.2022.114107] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 07/27/2022] [Accepted: 08/11/2022] [Indexed: 11/16/2022]
Abstract
In starfish, a relaxin-like gonad-stimulating peptide (RGP) is the gonadotropin responsible for final gamete maturation. RGP comprises two different peptides, A- and B-chains with two interchain and one intrachain disulfide bonds. The existence of two isomers of RGP in the crown-of-thorns starfish, Acanthaster planci, has been reported previously, but it was recently shown that A. planci represents a species complex with four different species. Here we elucidated the authentic sequence of the Pacific species, Acanthaster cf. solaris, RGP (Aso-RGP). The Aso-RGP precursor encoded by a 354 base pair open reading frame was composed of 117 amino acids (aa). The amino acid identity of Aso-RGP to Patiria pectinifera RGP (Ppe-RGP) and Asterias amurensis RGP (Aam-RGP) was 74% and 60%, respectively. Synthetic Aso-RGP induced spawning of ovarian fragments from A. cf. solaris. Ppe-RGP and Aam-RGP also induced spawning by A. cf. solaris ovaries. In contrast, Ppe-RGP and Aso-RGP induced spawning by P. pectinifera ovaries, but Aam-RGP was inactive. Notably, anti-Ppe-RGP antibodies recognized Aso-RGP as well as Ppe-RGP. Localization of Aso-RGP was observed immunohistochemically using anti-Ppe-RGP antibodies, showing that Aso-RGP was mainly present in the radial nerve cords of A. cf. solaris. Aso-RGP was distributed not only in the epithelium of the ectoneural region but also in the neuropile of the ectoneural region. These results suggest that Aso-RGP is synthesized in the epithelium of the ectoneural region, then transferred to fibers in the neuropile of the ectoneural region in radial nerve cords.
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Affiliation(s)
- Masatoshi Mita
- Department of Biochemistry, Showa University School of Medicine, 1-5-8, Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan.
| | - Tomohiro Osugi
- Bioorganic Research Institute, Suntory Foundation for Life Sciences, 8-1-1 Seikadai, Seika-cho, Soraku-gun, Kyoto 619-0284, Japan
| | - Tsuyoshi Kawada
- Bioorganic Research Institute, Suntory Foundation for Life Sciences, 8-1-1 Seikadai, Seika-cho, Soraku-gun, Kyoto 619-0284, Japan
| | - Honoo Satake
- Bioorganic Research Institute, Suntory Foundation for Life Sciences, 8-1-1 Seikadai, Seika-cho, Soraku-gun, Kyoto 619-0284, Japan
| | - Hidekazu Katayama
- Department of Applied Biochemistry, School of Engineering, Tokai University, 4-1-1, Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan
| | - Takaya Kitamura
- The Kuroshio Biological Research Foundation, Nishidomari, Otsuki-cho, Hata-gun, Kochi 788-0333, Japan
| | - Takeshi Miura
- Laboratory of Aquaculture and Livestock Production, The United Graduate School of Agricultural Science, Ehime University, Tarumi 3-5-7, Matuyama-shi, Ehime 790-8566, Japan
| | - Chiemi Miura
- Department of Global Environmental Studies, Faculty of Environmental Studies, Hiroshima Institute of Technology, Miyake 2-1-1, Saeki-ku, Hiroshima 731-5193, Japan
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Cohen J, Natale C, Lin J, Lorusso P, Mita A, Mita M, Muller C, Orloff M, Papadopoulos K, Rodon J, Garyantes T. 85P A circulating, surrogate-systemic biomarker correlates with anti-tumor benefit on LNS8801 therapy. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.07.117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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Athulya N, Mita M. Quintessential leadership of 21st century – paving through the pandemic. CM 2022. [DOI: 10.18137/cardiometry.2022.23.216225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Purpose: Organizational Leaders need to respond quickly to crises with their innovative ideas using the nascent technology. During times of crisis (Pandemic – COVID 19), this is relatively challenging due to the situation’s lack of knowledge and uncertainty. Design and Methodology: This article essentially focuses on a set of qualities that leaders should hold in today’s day and age. We have considered the literature in leadership over past years, how it has evolved, the literature around the stages in a crisis, and what kind of skills are required to sail through each of these stages. We have collected information about how companies have reacted towards the Pandemic – COVID 19 by interviewing the top management for our data. Findings: In the last stage, we have analyzed the data and presented the utmost skills, which will be sought after in a leadership candidate. Each of these skills has been associated with a particular Leadership style, which has a people orientation. We have introduced new terminology that is Quintessential Leadership. Originality: Findings of this research give a new model to the existing literature.
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Mita A, Mita M, Tsai F, Moore R, Bailes J, Matrana M. 548P Phase I study of oral GZ17-6.02 in patients with advanced solid tumors or lymphoma. Ann Oncol 2021. [DOI: 10.1016/j.annonc.2021.08.1070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Mita M, Elphick MR, Katayama H. A specific and sensitive enzyme-linked immunosorbent assay for measurement of relaxin-like gonad-stimulating peptide in the starfish Asterias rubens. Gen Comp Endocrinol 2021; 310:113831. [PMID: 34089706 DOI: 10.1016/j.ygcen.2021.113831] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Revised: 03/10/2021] [Accepted: 06/01/2021] [Indexed: 11/22/2022]
Abstract
A relaxin-like gonad-stimulating peptide (RGP) acts as a gonadotropic hormone in starfish. In this study, antibodies to Asterias rubens RGP (AruRGP) were used for the development of a specific and sensitive enzyme-linked immunosorbent assay (ELISA) to measure AruRGP. Biotin-conjugated RGP (biotin-AruRGP) that binds to peroxidase-conjugated streptavidin was synthesized chemically so that it could be specifically detected using 3, 3', 5, 5'-tetramethylbenzidine (TMB)/hydrogen peroxide as a substrate. Similar to AruRGP, biotin-AruRGP bound to AruRGP antibodies. In binding experiments with biotin-AruRGP using wells coated with AruRGP antibodies, a displacement curve was obtained using serial dilutions of AruRGP. Using this ELISA system, AruRGP could be measured in the range 0.01-5.0 pmol per 50 µl test solution. Furthermore, 0.22 ± 0.03 and 0.20 ± 0.04 pmol AruRGP/mg wet weight tissue were detected in the radial nerve cords and circumoral nerve-rings of A. rubens, respectively. Smaller amounts of AruRGP were detected in tube feet, pyloric stomach and cardiac stomach but AruRGP was not detected in pyloric caeca, ovaries and testes. Analysis of the specificity of the AruRGP antibodies revealed that the A- and B-chains of AruRGP, Patiria pectinifera RGP, Aphelasterias japonica RGP, and human relaxin exhibit little or no cross-reactivity in the ELISA. We conclude, therefore, that we have successfully generated an ELISA system that is highly sensitive and specific for detection of AruRGP.
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Affiliation(s)
- Masatoshi Mita
- Department of Biochemistry, Showa University School of Medicine, Hatanodai 8-5-1, Shinagawa-ku, Tokyo 142-8555, Japan.
| | - Maurice R Elphick
- Queen Mary University of London, School of Biological & Chemical Sciences, Mile End Road, London E1 4NS, UK
| | - Hidekazu Katayama
- Department of Applied Biochemistry, School of Engineering, Tokai University, 4-1-1, Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan
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Ashwin N, Mita M. Work life balance of medical professionals during Covid-19. CM 2021. [DOI: 10.18137/cardiometry.2021.19.5358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Work life balance even though has been a contemporary topicin recent years but still there are organisations and job profileswhich do not allow a good work life balance. Most researchersfocused on female doctors or female nurses for their researchbut researchers have proved that work life balance impactequally irrespective of gender. During pandemic we are hearinga greater number of cases where medical professionals are workingin difficult conditions. Even during pandemic work life balanceshould be given importance. Questionnaire was circulatedthrough social media and 80 responses were received. Findingof this study reveals that medical professionals’ work life balanceis greatly affected by organisational factors as well as emotionaland physical wellbeing. This research will have social implicationsin terms of understanding challenges faced by medical professionalsin terms of managing their work- life–balance.
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Mita M, Osugi T, Matsubara S, Kawada T, Satake H, Katayama H. A relaxin-like gonad-stimulating peptide identified from the starfish Astropecten scoparius. Mol Reprod Dev 2020; 88:34-42. [PMID: 33244845 DOI: 10.1002/mrd.23444] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Revised: 11/17/2020] [Accepted: 11/18/2020] [Indexed: 11/12/2022]
Abstract
A relaxin-like gonad-stimulating peptide (RGP) in starfish was the first identified invertebrate gonadotropin responsible for final gamete maturation. An RGP ortholog was newly identified from Astropecten scoparius of the order Paxillosida. The A. scoparius RGP (AscRGP) precursor is encoded by a 354 base pair open reading frame and is a 118 amino acid (aa) protein consisting of a signal peptide (26 aa), B-chain (21 aa), C-peptide (47 aa), and A-chain (24 aa). There are three putative processing sites (Lys-Arg) between the B-chain and C-peptide, between the C-peptide and A-chain, and within the C-peptide. This structural organization revealed that the mature AscRGP is composed of A- and B-chains with two interchain disulfide bonds and one intrachain disulfide bond. The C-terminal residues of the B-chain are Gln-Gly-Arg, which is a potential substrate for formation of an amidated C-terminal Gln residue. Non-amidated (AscRGP-GR) and amidated (AscRGP-NH2 ) peptides were chemically synthesized and their effect on gamete shedding activity was examined using A. scoparius ovaries. Both AscRGP-GR and AscRGP-NH2 induced oocyte maturation and ovulation in similar dose-dependent manners. This is the first report on a C-terminally amidated functional RGP. Collectively, these results suggest that AscRGP-GR and AscRGP-NH2 act as a natural gonadotropic hormone in A. scoparius.
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Affiliation(s)
- Masatoshi Mita
- Department of Biochemistry, Showa University School of Medicine, Shinagawa-ku, Tokyo, Japan
| | - Tomohiro Osugi
- Bioorganic Research Institute, Suntory Foundation for Life Sciences, Soraku-gun, Kyoto, Japan
| | - Shin Matsubara
- Bioorganic Research Institute, Suntory Foundation for Life Sciences, Soraku-gun, Kyoto, Japan
| | - Tsuyoshi Kawada
- Bioorganic Research Institute, Suntory Foundation for Life Sciences, Soraku-gun, Kyoto, Japan
| | - Honoo Satake
- Bioorganic Research Institute, Suntory Foundation for Life Sciences, Soraku-gun, Kyoto, Japan
| | - Hidekazu Katayama
- Department of Applied Biochemistry, Tokai University, Hiratsuka, Kanagawa, Japan
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Mita M, Matsubara S, Osugi T, Shiraishi A, Wada A, Satake H. A novel G protein-coupled receptor for starfish gonadotropic hormone, relaxin-like gonad-stimulating peptide. PLoS One 2020; 15:e0242877. [PMID: 33226996 PMCID: PMC7682835 DOI: 10.1371/journal.pone.0242877] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Accepted: 11/10/2020] [Indexed: 12/12/2022] Open
Abstract
Gonadotropic hormones play important regulatory roles in reproduction. Relaxin-like gonad-stimulating peptide (RGP) is a gonadotropin-like hormone in starfish. However, a receptor for RGP remains to be identified. Here, we describe the identification of an authentic receptor for RGP (RGPR) in the starfish, Patiria pectinifera. A binding assay using radioiodinated P. pectinifera RGP (PpeRGP) revealed that RGPR was expressed in ovarian follicle cells. A RGPR candidate was identified by homology-searching of transcriptome data of P. pectinifera follicle cells. Based on the contig sequences, a putative 947-amino acid PpeRGPR was cloned from follicle cells. Like the vertebrate relaxin family peptide receptors (RXFP 1 and 2), PpeRGPR was a G protein-coupled receptor that harbored a low-density lipoprotein-receptor class A motif and leucine-rich repeat sequences in the extracellular domain of the N-terminal region. Sf9 cells transfected with Gαq16-fused PpeRGPR activated calcium ion mobilization in response to PpeRGP, but not to RGP of another starfish Asterias amurensis, in a dose-dependent fashion. These results confirmed the species-specific reactivity of RGP and the cognate receptor. Thus, the present study provides evidence that PpeRGPR is a specific receptor for PpeRGP. To the best of our knowledge, this is the first report on the identification of a receptor for echinoderm RGP.
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Affiliation(s)
- Masatoshi Mita
- Department of Biochemistry, Showa University School of Medicine, Tokyo, Japan
| | - Shin Matsubara
- Bioorganic Research Institute, Suntory Foundation for Life Sciences, Kyoto, Japan
| | - Tomohiro Osugi
- Bioorganic Research Institute, Suntory Foundation for Life Sciences, Kyoto, Japan
| | - Akira Shiraishi
- Bioorganic Research Institute, Suntory Foundation for Life Sciences, Kyoto, Japan
| | - Azumi Wada
- Bioorganic Research Institute, Suntory Foundation for Life Sciences, Kyoto, Japan
| | - Honoo Satake
- Bioorganic Research Institute, Suntory Foundation for Life Sciences, Kyoto, Japan
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Schiff J, Sittig M, Cook-Wiens G, Mirhadi A, Burnison M, Amersi F, Chung A, Dang C, Giuliano A, Karlan S, Basho R, el-Masry M, McAndrew P, McArthur H, Mita M, Park D, Shiao S. Impact of Age in Women with Stage I-III Triple Negative Breast Cancer (TNBC): A National Cancer Data Base (2004-2014) Report. Int J Radiat Oncol Biol Phys 2020. [DOI: 10.1016/j.ijrobp.2020.07.1130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Okubo N, Nakano Y, Mita M. Lipid composition of gametes in scleractinian reef-building corals: wax-esters generate buoyancy for the gametes. INVERTEBR REPROD DEV 2020. [DOI: 10.1080/07924259.2020.1815875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Nami Okubo
- Center for General Education, Tokyo Keizai University, Tokyo, Japan
| | - Yoshikatsu Nakano
- Tropical Biosphere Research Center, Sesoko Station, Ryukyu University, Okinawa, Japan
| | - Masatoshi Mita
- Department of Biochemistry, Showa University School of Medicine, Tokyo, Japan
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16
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Mita M, Osugi T, Takahashi T, Watanabe T, Satake H. Mechanism of gamete shedding in starfish: Involvement of acetylcholine in extracellular Ca 2+-dependent contraction of gonadal walls. Gen Comp Endocrinol 2020; 290:113401. [PMID: 31981689 DOI: 10.1016/j.ygcen.2020.113401] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2019] [Revised: 01/14/2020] [Accepted: 01/20/2020] [Indexed: 01/22/2023]
Abstract
Starfish are suitable animals for the study of hormonal regulatory mechanism of oocyte maturation and ovulation. Although contraction of the gonadal walls is essential for the shedding gametes, little was known about the mechanism. When ovaries of starfish Patiria pectinifera were incubated in Ca2+-free seawater in the presence of 1-methyladenine (1-MeAde), the germinal vesicles in oocytes broke down, but no ovulation occurred. Verapamil, a potent inhibitor of voltage-dependent Ca2+ channels, inhibited 1-MeAde-induced ovulation. These results suggest that extracellular Ca2+ and its influx are indispensable for gamete shedding. Furthermore, acetylcholine (ACh) was involved in extracellular Ca2+-dependent contractions of gonadal walls. Although 1-MeAde failed to induce contraction of the gonadal walls in normal seawater containing L-glutamic acid, application of ACh or carbachol, an agonist for ACh receptor, could bring about shedding of mature oocytes. Atropine, a competitive antagonist of the muscarinic ACh receptor, inhibited 1-MeAde-induced ovulation, but a nicotinic ACh receptor antagonist mecamylamine had no effect. Furthermore, ACh was detected in the ovaries and testes in P. pectinifera. These findings suggest that ACh acts on muscarinic ACh receptors in gonadal walls to induce peristaltic contractions caused by Ca2+ influx via Ca2+ channels in the gonadal wall muscle for gamete shedding. The present study also provides new insight into the regulatory mechanism that 1-MeAde acts on secretion of ACh in ovaries and testes.
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Affiliation(s)
- Masatoshi Mita
- Department of Biochemistry, Showa University School of Medicine, 1-5-8, Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan; Center for Advanced Biomedical Sciences, Research Institute for Science and Engineering, Waseda University, 2-2, Wakamatsu-cho, Shinjuku-ku, Tokyo 162-8480, Japan.
| | - Tomohiro Osugi
- Bioorganic Research Institute, Suntory Foundation for Life Sciences, 8-1-1 Seikadai, Seika-cho, Soraku-gun, Kyoto 619-0284, Japan
| | - Toshio Takahashi
- Bioorganic Research Institute, Suntory Foundation for Life Sciences, 8-1-1 Seikadai, Seika-cho, Soraku-gun, Kyoto 619-0284, Japan
| | - Takehiro Watanabe
- Bioorganic Research Institute, Suntory Foundation for Life Sciences, 8-1-1 Seikadai, Seika-cho, Soraku-gun, Kyoto 619-0284, Japan
| | - Honoo Satake
- Bioorganic Research Institute, Suntory Foundation for Life Sciences, 8-1-1 Seikadai, Seika-cho, Soraku-gun, Kyoto 619-0284, Japan
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17
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Sakae Y, Oikawa A, Sugiura Y, Mita M, Nakamura S, Nishimura T, Suematsu M, Tanaka M. Starvation causes female-to-male sex reversal through lipid metabolism in the teleost fish, medaka ( Olyzias latipes). Biol Open 2020; 9:9/4/bio050054. [PMID: 32265199 PMCID: PMC7132775 DOI: 10.1242/bio.050054] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
The teleost fish, medaka (Oryzias latipes), employs the XX/XY genetic sex determination system. We show here that the phenotypic sex of medaka is affected by changes in lipid metabolism. Medaka larvae subjected to 5 days of starvation underwent female-to-male sex reversal. Metabolomic and RT-qPCR analyses indicated that pantothenate metabolism was suppressed by starvation. Consistently, inhibiting the pantothenate metabolic pathway caused sex reversal. The final metabolite in this pathway is coenzyme A, an essential factor for lipogenesis. Inhibiting fatty acid synthesis, the first step of lipogenesis, also caused sex reversal. The expression of dmrt1, a critical gene for male development, was suppressed by starvation, and a dmrt1 (Δ13) mutant did not show sex reversal under starvation. Collectively, these results indicate that fatty acid synthesis is involved in female-to-male sex reversal through ectopic expression of male gene dmrt1 under starvation. Summary: We investigated the effects of starvation on sex differentiation in medaka. Starvation caused female-to-male sex reversal through pantothenate metabolism, fatty acid synthesis and dmrt1 expression.
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Affiliation(s)
- Yuta Sakae
- Division of Biological Science, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan.,Laboratory of Molecular Genetics for Reproduction, National Institute for Basic Biology, Okazaki 444-8787, Japan.,SOKENDAI (The Graduate University for Advanced Studies), Department of Basic Biology, Faculty of Life Science, Okazaki 444-8787, Japan
| | - Akira Oikawa
- RIKEN Center for Sustainable Resource Science, Metabolomics Research Group, Yokohama 230-0045, Japan.,Faculty of Agriculture, Yamagata University, Tsuruoka 997-8555, Japan
| | - Yuki Sugiura
- Department of Biochemistry, Keio University School of Medicine, Tokyo 160-8582, Japan
| | - Masatoshi Mita
- Department of Biochemistry, Showa University School of Medicine, Tokyo 142-8555, Japan
| | - Shuhei Nakamura
- Institute for Advanced Co-Creation Studies, Osaka University, Osaka 565-0871, Japan.,Department of Intracellular Membrane Dynamics, Graduate School of Frontier Biosciences, Osaka University, Osaka 565-0871, Japan.,Department of Genetics, Graduate School of Medicine, Osaka University, Osaka 565-0871, Japan
| | - Toshiya Nishimura
- Division of Biological Science, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
| | - Makoto Suematsu
- Department of Biochemistry, Keio University School of Medicine, Tokyo 160-8582, Japan
| | - Minoru Tanaka
- Division of Biological Science, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan .,Laboratory of Molecular Genetics for Reproduction, National Institute for Basic Biology, Okazaki 444-8787, Japan.,SOKENDAI (The Graduate University for Advanced Studies), Department of Basic Biology, Faculty of Life Science, Okazaki 444-8787, Japan
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18
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Mita M, Elphick MR, Katayama H. Effect of chimeric relaxin-like gonad-stimulating peptides on oocyte maturation and ovulation in the starfish Asterias rubens and Aphelasterias japonica. Gen Comp Endocrinol 2020; 287:113351. [PMID: 31805285 DOI: 10.1016/j.ygcen.2019.113351] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Revised: 10/15/2019] [Accepted: 11/29/2019] [Indexed: 12/14/2022]
Abstract
A relaxin-like gonad-stimulating peptide (RGP), comprising two peptide chains (A- and B-chains) linked by two interchain bonds and one intrachain disulfide bond, acts as a gonadotropin in starfish. RGP orthologs have been identified in several starfish species, including Patiria pectinifera (PpeRGP), Asterias rubens (AruRGP) and Aphelasterias japonica (AjaRGP). To analyze species-specificity, this study examined the effects on oocyte maturation and ovulation in ovaries of A. rubens and A. japonica of nine RGP derivatives comprising different combinations of A- and B-chains from the three species. All nine RGP derivatives induced spawning in A. rubens and A. japonica ovaries. However, AruRGP, AjaRGP and their chimeric derivatives were more potent than peptides containing the A- or B-chain of PpeRGP. Three-dimensional models of the structures of the RGP derivatives revealed that residues in the B-chains, such as AspB6, MetB10 and PheB13 in PpeRGP and GluB7, MetB11, and TyrB14 in AruRGP and AjaRGP, respectively, are likely to be involved in receptor binding. Conversely, it is likely that ArgA18 in the A-chain of AruRGP and AjaRGP impairs binding of these peptides to the PpeRGP receptor in P. pectinifera. In conclusion, this study provides new insights into the structural basis of RGP bioactivity and RGP receptor activation in starfish.
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Affiliation(s)
- Masatoshi Mita
- Department of Biochemistry, Showa University School of Medicine, Hatanodai 8-5-1, Shinagawa-ku, Tokyo 142-8555, Japan; Center for Advanced Biomedical Sciences, Waseda University, 2-2, Wakamatsu-cho, Shinjuku-ku, Tokyo 162-8480, Japan.
| | - Maurice R Elphick
- Queen Mary University of London, School of Biological & Chemical Sciences, Mile End Road, London E1 4NS, UK
| | - Hidekazu Katayama
- Department of Applied Biochemistry, School of Engineering, Tokai University, 4-1-1, Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan
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19
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Katayama H, Mizuno R, Mita M. A novel approach for preparing disulfide-rich peptide-KLH conjugate applicable to the antibody production. Biosci Biotechnol Biochem 2019; 83:1791-1799. [DOI: 10.1080/09168451.2019.1618696] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
ABSTRACT
To produce the antiserum against a small peptide, the target peptide-keyhole limpet hemocyanine (KLH) conjugate is generally used as an antigen, although the disulfide-rich peptide-KLH conjugate is still difficult to prepare. In our previous study, we have developed a preparation method of the disulfide-rich peptide-KLH conjugate, and this method was applied to produce the antiserum against a relaxin-like peptide. However, this method is limited to the synthetic peptide antigen, and is not applicable to a native or a recombinant peptide. In this study, to expand the applicability of this method to wide variety of peptides, we newly designed a novel thiol probe enabling the conjugation between various peptides and KLH, and applied it to produce the antiserum against relaxin-like peptide of a starfish Asterias amurensis. The antiserum obtained here showed high antibody-titer and good specificity, strongly suggesting that the method developed in this study is applicable to various peptides.
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Affiliation(s)
- Hidekazu Katayama
- Department of Applied Biochemistry, School of Engineering, Tokai University, Kanagawa, Japan
| | - Ryo Mizuno
- Department of Applied Biochemistry, School of Engineering, Tokai University, Kanagawa, Japan
| | - Masatoshi Mita
- Center for Advanced Biomedical Sciences, TWIns, Research Institute for Science and Engineering, Waseda University, Tokyo, Japan
- Department of Biochemistry, Showa University School of Medicine, Tokyo, Japan
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20
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Mita A, Loeffler M, Bui N, Remmy D, Mehrling T, Mita M, Rimel B, Natale R, Kummar S. A phase I study of tinostamustine in patients (pts) with advanced solid tumours. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz244.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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21
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Samaniego F, Hollebecque A, Foss F, Lister J, Mita M, Wagner-Johnston N, Dyer M, You B, Prica A, Hernandez-Llizaliturri F, Ferraldeschi R, Chan D, Zhang J, Mehta A. PRELIMINARY RESULTS OF ASTX660, A NOVEL NON-PEPTIDOMIMETIC cIAP1/2 AND XIAP ANTAGONIST, IN RELAPSED/REFRACTORY PERIPHERAL T-CELL LYMPHOMA AND CUTANEOUS T CELL LYMPHOMA. Hematol Oncol 2019. [DOI: 10.1002/hon.211_2631] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- F. Samaniego
- Lymphoma & Myeloma; UT MD Anderson Cancer Center; Houston United States
| | - A. Hollebecque
- Early Drug Development (DITEP) Gastro-Intestinal Oncology; Institute Gustave Roussy; Villejuif France
| | - F. Foss
- Internal Medicine; Hematology, Yale Cancer Center; New Haven United States
| | - J. Lister
- Division of Hematology and Cellular Therapy; Allegheny Health Network Cancer Institute; Pittsburgh United States
| | - M. Mita
- Experimental Therapeutics; Samuel Oschin Comprehensive Cancer Institute Cedars-Sinai Medical Center; Los Angeles United States
| | | | - M. Dyer
- Ernest and Helen Scott Haematological Research Institute; University of Leicester; Leicester United Kingdom
| | - B. You
- Medical Oncology; Centre Hospitalier Lyon Sud; Pierre Benite France
| | - A. Prica
- Hematology; Princess Margaret Cancer Centre Mount Sinai Hospital; Toronto Ontario Canada
| | | | - R. Ferraldeschi
- Clinical Development; Astex Pharmaceuticals, Inc.; Pleasanton United States
| | - D. Chan
- Clinical Development; Astex Pharmaceuticals, Inc.; Pleasanton United States
| | - J. Zhang
- Clinical Development; Astex Pharmaceuticals, Inc.; Pleasanton United States
| | - A. Mehta
- Hematology and Oncology; University of Alabama at Birmingham; Birmingham United States
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22
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Mita M, Nakamura K, Tsutsui K, Katayama H. Interaction of starfish gonadotropin with its receptor: Effect of chimeric relaxin-like gonad-stimulating peptides. Gen Comp Endocrinol 2019; 276:30-36. [PMID: 30796897 DOI: 10.1016/j.ygcen.2019.02.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Revised: 02/15/2019] [Accepted: 02/19/2019] [Indexed: 10/27/2022]
Abstract
A relaxin-like gonad-stimulating peptide (RGP) of starfish Patiria (Asterina) pectinifera is the first identified invertebrate gonadotropin for final gamete maturation. Recently, we found three orthologs of RGP in the class Asteroida; PpeRGP in P. pectinifera, AamRGP in Asterias amurensis, and AjaRGP in Aphelasterias japonica. In this study, nine kinds of RGP derivatives with exchanged each A- and B-chain were synthesized chemically to analyze the interaction of RGP with its receptor. Among these RGP derivatives, PpeRGP and its chimeric RGPs with B-chains from AamRGP or AjaRGP could induce oocyte maturation and ovulation in P. pectinifera ovaries. In contrast, other RGP derivatives were failed to induce spawning in P. pectinifera ovaries. Circular dichroism spectra of PpeRGP were similar to those of chimeric RGPs with the B-chains from AamRGP or AjaRGP. Furthermore, the predicted three-dimensional structure models of the B-chains from RGP derivatives have almost the same conformation. These findings suggest that the B-chain of PpeRGP is involved in binding to its receptor. Thus, it is likely that the A-chain of AamRGP or AjaRGP disturbs the binding of the PpeRGP B-chain to its receptor.
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Affiliation(s)
- Masatoshi Mita
- Center for Advanced Biomedical Sciences, Research Institute for Science and Engineering, Waseda University, 2-2, Wakamatsu-cho, Shinjuku-ku, Tokyo 162-8480, Japan.
| | - Keitaro Nakamura
- Department of Applied Biochemistry, School of Engineering, Tokai University, 4-1-1, Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan
| | - Kazuyoshi Tsutsui
- Center for Advanced Biomedical Sciences, Research Institute for Science and Engineering, Waseda University, 2-2, Wakamatsu-cho, Shinjuku-ku, Tokyo 162-8480, Japan; Laboratory of Integrative Brain Sciences, Department of Biology, Faculty of Education and Integrated Arts and Sciences, Waseda University, Wakamatsucho 2-2, Shinjuku-ku, Tokyo 162-8480, Japan
| | - Hidekazu Katayama
- Department of Applied Biochemistry, School of Engineering, Tokai University, 4-1-1, Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan
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23
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Mita M. Starfish Gonadotropic Hormone: From Gamete-Shedding Substance to Relaxin-Like Gonad-Stimulating Peptide. Front Endocrinol (Lausanne) 2019; 10:182. [PMID: 30967842 PMCID: PMC6442644 DOI: 10.3389/fendo.2019.00182] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Accepted: 03/04/2019] [Indexed: 12/02/2022] Open
Abstract
The first report of a gonadotropic substance in an invertebrate hot-water extract of radial nerve cords from starfish Asterias forbesi that induced the shedding of gametes when injected into the coelomic cavity in a ripe individual occurred in 1959. The active substance was named gamete-shedding substance (GSS) or radial nerve factor. GSS is the primary mediator of oocyte maturation and ovulation in starfish. However, the effect of GSS is indirect. Resumption of meiosis in immature oocytes and release from the ovary are induced by a second mediator, maturation-inducing hormone, identified as 1-methyladenine (1-MeAde) in starfish. The role of GSS is to induce 1-MeAde production by ovarian follicle cells. Thus, GSS was redesignated as gonad-stimulating substance (also GSS). Although GSS has been characterized biochemically as a peptide hormone, identification of the chemical structure had to wait until 2009. Fifty years after the initial finding, GSS was purified from the radial nerve cords of starfish Patiria pectinifera (P. pectinifera). The purified hormone was a heterodimer composed of A- and B-chains, with disulfide cross-linkages. Based on its cysteine motif, GSS is classified as a member of the insulin/insulin-like growth factor (IGF)/relaxin superfamily. More specifically, phylogenetic sequence analysis revealed that P. pectinifera GSS is a member of the relaxin-type peptide family. Therefore, GSS in starfish has been redesignated as relaxin-like gonad-stimulating peptide (RGP). Subsequently, orthologs of P. pectinifera RGP have been identified in other starfish species, including Asterias amurensis (A. amurensis), and Aphelasterias japonica (A. japonica).
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Affiliation(s)
- Masatoshi Mita
- Center for Advanced Biomedical Sciences, Research Institute for Science and Engineering, Waseda University, Tokyo, Japan
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24
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McArthur HL, Basho R, Shiao SL, Park D, Mita M, Chung A, Arnold B, Martin C, Dang C, Karlan S, Knott S, Giuliano A, Ho A. Abstract P2-09-07: Preoperative pembrolizumab (Pembro) with radiation therapy (RT) in patients with operable triple-negative breast cancer (TNBC). Cancer Res 2019. [DOI: 10.1158/1538-7445.sabcs18-p2-09-07] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background: Radiation therapy (RT) induces immune-mediated cell death and could generate a rich supply of tumor antigens if administered in the pre-operative, curative-intent setting. The addition of PD-1 mediated checkpoint blockade to pre-operative RT could thus, generate robust anti-tumor immune responses, induce long-term tumor-specific memory, and ultimately, improve cure rates. This study aims to establish the safety of pre-operative pembrolizumab (pembro)-mediated immune modulation with a RT “boost” equivalent in patients with operable triple negative breast cancer (TNBC) for whom lumpectomy and adjuvant RT are planned (NCT03366844). Serial research biopsies permit interrogation of conventional biomarkers including tumor infiltrating lymphocytes (TILs) and novel immune correlates as potential predictors of response to pembro alone versus pembro with RT.
Methods: Ten women with operable, primary TNBC >2cm for whom breast-conserving therapy is planned are being enrolled in this single-institution pilot study. Study treatment consists of 1 cycle of pre-operative pembro (200 mg IV) alone, followed 3 weeks later by a RT boost (24 Gy/3 fractions) to the primary breast tumor concurrently with pembro (+/- 5 days). Curative-intent, standard-of-care, neoadjuvant chemotherapy (NAC) or breast-conserving surgery is then undertaken within 8 weeks of study enrollment (i.e. within 5 weeks of pembro #2). Adjuvant RT is administered per standard-of-care after surgery, but without a boost dose. Research blood and fresh tumor biopsies are obtained at baseline and after cycles 1 and 2 of pembro. Co-primary endpoints are: 1) safety/tolerability, as defined by the number of patients who do not necessitate a delay in standard-of-care chemotherapy or surgery and 2) change in TIL score. Secondary endpoints include safety/toxicity up to 19 weeks after study enrollment, pCR rates and disease-free survival. Correlative analysis will include single-cell RNA sequencing of the tumor immune infiltrate and multispectral immunohistochemistry
Results: Seven patients enrolled between 12/19/17 and 7/1/18. As of 7/1/18, 5 patients have completed the experimental pembro/RT phase of the trial and are currently completing standard-of-care NAC; 1 patient is currently being treated in the experimental pembro/RT phase; and 1 patient with a cT2N0 tumor at baseline achieved a pathologic complete response (pCR, ypT0/Tis ypN0) after completing the experimental pembro/RT phase followed by anthracycline- and taxane-based NAC. No grade 3 or 4 toxicities have been observed during pembro/RT in the 6 patients completing the experimental phase to date. Three additional patients will be enrolled
Conclusions: This is the first trial of curative-intent, pre-operative checkpoint blockade with RT in breast cancer and the strategy appears to be well tolerated to date. At the time of presentation, safety, change in TIL score, and pCR rates for all patients completing the experimental and NAC phases of the study will be reported.
Citation Format: McArthur HL, Basho R, Shiao SL, Park D, Mita M, Chung A, Arnold B, Martin C, Dang C, Karlan S, Knott S, Giuliano A, Ho A. Preoperative pembrolizumab (Pembro) with radiation therapy (RT) in patients with operable triple-negative breast cancer (TNBC) [abstract]. In: Proceedings of the 2018 San Antonio Breast Cancer Symposium; 2018 Dec 4-8; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2019;79(4 Suppl):Abstract nr P2-09-07.
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Affiliation(s)
- HL McArthur
- Cedars-Sinai Medical Center, Los Angeles, CA; Massachusetts General Hospital, Boston, MA
| | - R Basho
- Cedars-Sinai Medical Center, Los Angeles, CA; Massachusetts General Hospital, Boston, MA
| | - SL Shiao
- Cedars-Sinai Medical Center, Los Angeles, CA; Massachusetts General Hospital, Boston, MA
| | - D Park
- Cedars-Sinai Medical Center, Los Angeles, CA; Massachusetts General Hospital, Boston, MA
| | - M Mita
- Cedars-Sinai Medical Center, Los Angeles, CA; Massachusetts General Hospital, Boston, MA
| | - A Chung
- Cedars-Sinai Medical Center, Los Angeles, CA; Massachusetts General Hospital, Boston, MA
| | - B Arnold
- Cedars-Sinai Medical Center, Los Angeles, CA; Massachusetts General Hospital, Boston, MA
| | - C Martin
- Cedars-Sinai Medical Center, Los Angeles, CA; Massachusetts General Hospital, Boston, MA
| | - C Dang
- Cedars-Sinai Medical Center, Los Angeles, CA; Massachusetts General Hospital, Boston, MA
| | - S Karlan
- Cedars-Sinai Medical Center, Los Angeles, CA; Massachusetts General Hospital, Boston, MA
| | - S Knott
- Cedars-Sinai Medical Center, Los Angeles, CA; Massachusetts General Hospital, Boston, MA
| | - A Giuliano
- Cedars-Sinai Medical Center, Los Angeles, CA; Massachusetts General Hospital, Boston, MA
| | - A Ho
- Cedars-Sinai Medical Center, Los Angeles, CA; Massachusetts General Hospital, Boston, MA
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25
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Smith MK, Bose U, Mita M, Hall MR, Elizur A, Motti CA, Cummins SF. Differences in Small Molecule Neurotransmitter Profiles From the Crown-of-Thorns Seastar Radial Nerve Revealed Between Sexes and Following Food-Deprivation. Front Endocrinol (Lausanne) 2018; 9:551. [PMID: 30374327 PMCID: PMC6196772 DOI: 10.3389/fendo.2018.00551] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Accepted: 08/30/2018] [Indexed: 01/14/2023] Open
Abstract
Neurotransmitters serve as chemical mediators of cell communication, and are known to have important roles in regulating numerous physiological and metabolic events in eumetazoans. The Crown-of-Thorns Seastar (COTS) is an asteroid echinoderm that has been the focus of numerous ecological studies due to its negative impact on coral reefs when in large numbers. Research devoted to its neural signaling, from basic anatomy to the key small neurotransmitters, would expand our current understanding of neural-driven biological processes, such as growth and reproduction, and offers a new approach to exploring the propensity for COTS population explosions and subsequent collapse. In this study we investigated the metabolomic profiles of small molecule neurotransmitters in the COTS radial nerve cord. Multivariate analysis shows differential abundance of small molecule neurotransmitters in male and female COTS, and in food-deprived individuals with significant differences between sexes in gamma-aminobutyric acid (GABA), histamine and serotonin, and significant differences in histamine and serotonin between satiation states. Annotation established that the majority of biosynthesis enzyme genes are present in the COTS genome. The spatial distribution of GABA, histamine and serotonin in the radial nerve cord was subsequently confirmed by immunolocalization; serotonin is most prominent within the ectoneural regions, including unique neural bulbs, while GABA and histamine localize primarily within neuropil fibers. Glutamic acid, which was also found in high relative abundance and is a precursor of GABA, is known as a spawning inhibitor in seastars, and as such was tested for inhibition of ovulation ex-vivo which resulted in complete inhibition of oocyte maturation and ovulation induced by 1-Methyladenine. These findings not only advance our knowledge of echinoderm neural signaling processes but also identify potential targets for developing novel approaches for COTS biocontrol.
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Affiliation(s)
- Meaghan K. Smith
- Genecology Research Centre, University of the Sunshine Coast, Maroochydore, DC, Australia
| | - Utpal Bose
- Genecology Research Centre, University of the Sunshine Coast, Maroochydore, DC, Australia
| | - Masatoshi Mita
- Center for Advanced Biomedical Sciences, TWIns Research Institute for Science and Engineering, Waseda University, Tokyo, Japan
| | - Michael R. Hall
- Australian Institute of Marine Science (AIMS), Cape Ferguson, Townsville, QLD, Australia
| | - Abigail Elizur
- Genecology Research Centre, University of the Sunshine Coast, Maroochydore, DC, Australia
| | - Cherie A. Motti
- Australian Institute of Marine Science (AIMS), Cape Ferguson, Townsville, QLD, Australia
| | - Scott F. Cummins
- Genecology Research Centre, University of the Sunshine Coast, Maroochydore, DC, Australia
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26
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McArthur H, Basho R, Shiao S, Park D, Dang C, Karlan S, Knott S, Mita M, Dilauro Abaya C, Giuliano A, Dadmanesh F, Ho A. Preoperative pembrolizumab (Pembro) with radiation therapy (RT) in patients with operable triple-negative breast cancer (TNBC). Ann Oncol 2018. [DOI: 10.1093/annonc/mdy270.265] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Specht J, Pusztai L, Forero-Torres A, Mita M, Weise A, Krop I, Grosse-Wilde A, Wang Z, Li M, Hengel S, Garfin P, Means G, Onsum M, Modi S. Post-treatment biopsies show evidence of cell cycle arrest and immune cell infiltration into tumors of ladiratuzumab vedotin-treated advanced breast cancer patients. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy272.278] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Mita M, Katayama H. Enzyme-linked immunosorbent assay of relaxin-like gonad-stimulating peptide in the starfish Patiria (Asterina) pectinifera. Gen Comp Endocrinol 2018; 258:157-162. [PMID: 28859971 DOI: 10.1016/j.ygcen.2017.08.027] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2017] [Revised: 08/25/2017] [Accepted: 08/27/2017] [Indexed: 10/19/2022]
Abstract
A relaxin-like gonad-stimulating peptide (RGP) from starfish Patiria (Asterina) pectinifera is the first identified invertebrate gonadotropin for final gamete maturation. Recently, we succeeded in obtaining specific antibodies against P. pectinifera RGP (PpeRGP). In this study, the antibodies were used for the development of a specific and sensitive enzyme-linked immunosorbent assay (ELISA) for the measurement of PpeRGP. A biotin-conjugated peptide that binds to peroxidase-conjugated streptavidin is specifically detectable using 3,3',5,5'-tetramethylbenzidine (TMB)/hydrogen peroxide as a substrate; therefore, biotin-conjugated RGP (biotin-PpeRGP) was synthesized chemically. Similarly to PpeRGP, synthetic biotin-PpeRGP bound to the antibody against PpeRGP. In binding experiments with biotin-PpeRGP using wells coated with the antibody, a displacement curve was obtained using serial concentrations of PpeRGP. The ELISA system showed that PpeRGP could be measured in the range 0.01-10pmol per 50µl assay buffer. On the contrary, the B-chains of PpeRGP, Asterias amurensis RGP, Aphelasterias japonica RGP, and human relaxin showed minimal cross-reactivity in the ELISA, except that the A-chain of PpeRGP affected it slightly. These results strongly suggest that this ELISA system is highly specific and sensitive with respect to PpeRGP.
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Affiliation(s)
- Masatoshi Mita
- Department of Biology, Faculty of Education, Tokyo Gakugei University, Koganei-shi, Tokyo 184-8501, Japan.
| | - Hidekazu Katayama
- Department of Applied Biochemistry, School of Engineering, Tokai University, Kitakaname 4-1-1, Hiratsuka, Kanagawa 259-1292, Japan
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Modi S, Pusztai L, Forero A, Mita M, Miller KD, Weise A, Krop I, Burris H, Kalinsky K, Tsai M, Liu MC, Hurvitz SA, Wilks S, Ademuyiwa F, Diab S, Han HS, Kato G, Nanda R, O'Shaughnessy J, Kostic A, Li M, Specht J. Abstract PD3-14: Phase 1 study of the antibody-drug conjugate SGN-LIV1A in patients with heavily pretreated triple-negative metastatic breast cancer. Cancer Res 2018. [DOI: 10.1158/1538-7445.sabcs17-pd3-14] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background
LIV-1, a transmembrane protein and downstream target of STAT3, is highly expressed in breast cancer cells. It is associated with lymph node involvement and metastatic progression. SGN-LIV1A is an anti-LIV-1 antibody conjugated via a protease-cleavable linker to monomethyl auristatin E (MMAE). Upon binding to cell-surface LIV-1, SGN-LIV1A is internalized and releases MMAE, which disrupts microtubulin and induces apoptosis.
Methods
This ongoing, phase 1 study evaluates safety, tolerability, pharmacokinetics, and antitumor activity of SGN-LIV1A (q3wks IV) in women with LIV-1-positive, unresectable, locally advanced or metastatic breast cancer (LA/MBC) (NCT01969643). Patients (pts) with measurable disease and ≥2 prior cytotoxic regimens for LA/MBC are eligible. Pts with ≥ Grade 2 neuropathy are excluded. Response is assessed per RECIST v1.1; pts with stable disease (SD) or better can continue treatment until disease progression or intolerable toxicity. At completion of dose escalation in hormone receptor-positive/HER2-negative (HR+/HER2–) and triple-negative (TN) pts, expansion cohorts were opened to further evaluate safety and antitumor activity of monotherapy in TN pts. Tumor biopsies are evaluated for LIV-1 expression.
Results
To date, 69 pts (18 HR+/HER2–, 51 TN) have received a median of 3 cycles (range, 1–12) of SGN-LIV1A at doses of 0.5–2.8 mg/kg. Median age was 56 yrs. Pts had a median of 3 prior cytotoxic regimens for LA/MBC; 58 had visceral disease and 37 had bone metastases. No dose-limiting toxicities (DLTs) occurred in 19 DLT-evaluable pts; maximum tolerated dose was not exceeded at 2.8 mg/kg. Expansion cohorts of TN pts were opened at 2.0 and 2.5 mg/kg. Treatment-emergent adverse events (AEs) reported in ≥25% of pts were fatigue (59%), nausea (51%), peripheral neuropathy (44%), alopecia (36%), decreased appetite (33%), constipation (30%), abdominal pain, diarrhea, and neutropenia (25% each). Most AEs were Grade 1/2; AEs ≥ Grade 3 included neutropenia (25%) and anemia (15%). Febrile neutropenia occurred in 2 pts whose total dose exceeded 200 mg per cycle, including 1 treatment-related death due to sepsis. No other treatment-related deaths occurred on-study. Seven pts discontinued treatment due to AEs. In dose escalation, activity was observed in 17 efficacy evaluable (EE) HR+/HER2- pts, with a disease control rate (DCR= CR+PR+SD) of 59% (10 SD), including 1 pt with SD ≥24 wks. Among the 44 EE TN pts (dose escalation plus expansion cohorts), the objective response rate (ORR) was 32% (14 PR) with a confirmed PR rate of 21%, DCR was 64% (14 PR, 14 SD), and clinical benefit rate (CBR=CR+PR+SD ≥24 wks) was 36% (16 pts). For TN pts, median PFS was 11.3 wks (95% CI: 6.1, 17.1); 10 pts remain on treatment.
Of 631 MBC tumor samples of all clinical subtypes evaluated for LIV-1, 91% were positive; 75% had moderate-to-high expression (H-score ≥100).
Conclusions
LIV-1 is expressed in almost all MBC tumors. SGN-LIV1A monotherapy was generally well tolerated and showed encouraging antitumor activity in heavily pretreated TN MBC, with a PR rate of 32%, confirmed PR rate of 21%, and CBR (≥24 wks) of 36%. Response duration data continue to evolve. Enrollment continues in the TN monotherapy expansion cohort.
Citation Format: Modi S, Pusztai L, Forero A, Mita M, Miller KD, Weise A, Krop I, Burris III H, Kalinsky K, Tsai M, Liu MC, Hurvitz SA, Wilks S, Ademuyiwa F, Diab S, Han HS, Kato G, Nanda R, O'Shaughnessy J, Kostic A, Li M, Specht J. Phase 1 study of the antibody-drug conjugate SGN-LIV1A in patients with heavily pretreated triple-negative metastatic breast cancer [abstract]. In: Proceedings of the 2017 San Antonio Breast Cancer Symposium; 2017 Dec 5-9; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2018;78(4 Suppl):Abstract nr PD3-14.
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Affiliation(s)
- S Modi
- Memorial Sloan Kettering Cancer Center, New York, NY; Yale Cancer Center, Yale School of Medicine, New Haven, CT; University of Alabama at Birmingham, Birmingham, AL; Cedars-Sinai Medical Center, Los Angeles, CA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Dana-Farber Cancer Institute, Boston, MA; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Columbia University Medical Center, New York, New York, NY; Virginia Piper Cancer Institute, Allina Health, Minneapolis, MN; Mayo Clinic, Rochester, MN; University of California, Los Angeles, Los Angeles, CA; Texas Oncology, San Antonio, TX; Washington University in St. Louis, St. Louis, MO; US Oncology Denver, Denver, CO; Moffitt Cancer Center, Tampa, FL; Virginia G. Piper Cancer Care Network, Scottsdale, AZ; University of Chicago, Chicago, IL; Baylor University Medical Center, Texas Oncology, US Oncology, Dallas, TX; Seattle Genetics, Inc., Bothell, WA; Seattle Cancer Care Allia
| | - L Pusztai
- Memorial Sloan Kettering Cancer Center, New York, NY; Yale Cancer Center, Yale School of Medicine, New Haven, CT; University of Alabama at Birmingham, Birmingham, AL; Cedars-Sinai Medical Center, Los Angeles, CA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Dana-Farber Cancer Institute, Boston, MA; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Columbia University Medical Center, New York, New York, NY; Virginia Piper Cancer Institute, Allina Health, Minneapolis, MN; Mayo Clinic, Rochester, MN; University of California, Los Angeles, Los Angeles, CA; Texas Oncology, San Antonio, TX; Washington University in St. Louis, St. Louis, MO; US Oncology Denver, Denver, CO; Moffitt Cancer Center, Tampa, FL; Virginia G. Piper Cancer Care Network, Scottsdale, AZ; University of Chicago, Chicago, IL; Baylor University Medical Center, Texas Oncology, US Oncology, Dallas, TX; Seattle Genetics, Inc., Bothell, WA; Seattle Cancer Care Allia
| | - A Forero
- Memorial Sloan Kettering Cancer Center, New York, NY; Yale Cancer Center, Yale School of Medicine, New Haven, CT; University of Alabama at Birmingham, Birmingham, AL; Cedars-Sinai Medical Center, Los Angeles, CA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Dana-Farber Cancer Institute, Boston, MA; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Columbia University Medical Center, New York, New York, NY; Virginia Piper Cancer Institute, Allina Health, Minneapolis, MN; Mayo Clinic, Rochester, MN; University of California, Los Angeles, Los Angeles, CA; Texas Oncology, San Antonio, TX; Washington University in St. Louis, St. Louis, MO; US Oncology Denver, Denver, CO; Moffitt Cancer Center, Tampa, FL; Virginia G. Piper Cancer Care Network, Scottsdale, AZ; University of Chicago, Chicago, IL; Baylor University Medical Center, Texas Oncology, US Oncology, Dallas, TX; Seattle Genetics, Inc., Bothell, WA; Seattle Cancer Care Allia
| | - M Mita
- Memorial Sloan Kettering Cancer Center, New York, NY; Yale Cancer Center, Yale School of Medicine, New Haven, CT; University of Alabama at Birmingham, Birmingham, AL; Cedars-Sinai Medical Center, Los Angeles, CA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Dana-Farber Cancer Institute, Boston, MA; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Columbia University Medical Center, New York, New York, NY; Virginia Piper Cancer Institute, Allina Health, Minneapolis, MN; Mayo Clinic, Rochester, MN; University of California, Los Angeles, Los Angeles, CA; Texas Oncology, San Antonio, TX; Washington University in St. Louis, St. Louis, MO; US Oncology Denver, Denver, CO; Moffitt Cancer Center, Tampa, FL; Virginia G. Piper Cancer Care Network, Scottsdale, AZ; University of Chicago, Chicago, IL; Baylor University Medical Center, Texas Oncology, US Oncology, Dallas, TX; Seattle Genetics, Inc., Bothell, WA; Seattle Cancer Care Allia
| | - KD Miller
- Memorial Sloan Kettering Cancer Center, New York, NY; Yale Cancer Center, Yale School of Medicine, New Haven, CT; University of Alabama at Birmingham, Birmingham, AL; Cedars-Sinai Medical Center, Los Angeles, CA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Dana-Farber Cancer Institute, Boston, MA; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Columbia University Medical Center, New York, New York, NY; Virginia Piper Cancer Institute, Allina Health, Minneapolis, MN; Mayo Clinic, Rochester, MN; University of California, Los Angeles, Los Angeles, CA; Texas Oncology, San Antonio, TX; Washington University in St. Louis, St. Louis, MO; US Oncology Denver, Denver, CO; Moffitt Cancer Center, Tampa, FL; Virginia G. Piper Cancer Care Network, Scottsdale, AZ; University of Chicago, Chicago, IL; Baylor University Medical Center, Texas Oncology, US Oncology, Dallas, TX; Seattle Genetics, Inc., Bothell, WA; Seattle Cancer Care Allia
| | - A Weise
- Memorial Sloan Kettering Cancer Center, New York, NY; Yale Cancer Center, Yale School of Medicine, New Haven, CT; University of Alabama at Birmingham, Birmingham, AL; Cedars-Sinai Medical Center, Los Angeles, CA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Dana-Farber Cancer Institute, Boston, MA; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Columbia University Medical Center, New York, New York, NY; Virginia Piper Cancer Institute, Allina Health, Minneapolis, MN; Mayo Clinic, Rochester, MN; University of California, Los Angeles, Los Angeles, CA; Texas Oncology, San Antonio, TX; Washington University in St. Louis, St. Louis, MO; US Oncology Denver, Denver, CO; Moffitt Cancer Center, Tampa, FL; Virginia G. Piper Cancer Care Network, Scottsdale, AZ; University of Chicago, Chicago, IL; Baylor University Medical Center, Texas Oncology, US Oncology, Dallas, TX; Seattle Genetics, Inc., Bothell, WA; Seattle Cancer Care Allia
| | - I Krop
- Memorial Sloan Kettering Cancer Center, New York, NY; Yale Cancer Center, Yale School of Medicine, New Haven, CT; University of Alabama at Birmingham, Birmingham, AL; Cedars-Sinai Medical Center, Los Angeles, CA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Dana-Farber Cancer Institute, Boston, MA; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Columbia University Medical Center, New York, New York, NY; Virginia Piper Cancer Institute, Allina Health, Minneapolis, MN; Mayo Clinic, Rochester, MN; University of California, Los Angeles, Los Angeles, CA; Texas Oncology, San Antonio, TX; Washington University in St. Louis, St. Louis, MO; US Oncology Denver, Denver, CO; Moffitt Cancer Center, Tampa, FL; Virginia G. Piper Cancer Care Network, Scottsdale, AZ; University of Chicago, Chicago, IL; Baylor University Medical Center, Texas Oncology, US Oncology, Dallas, TX; Seattle Genetics, Inc., Bothell, WA; Seattle Cancer Care Allia
| | - H Burris
- Memorial Sloan Kettering Cancer Center, New York, NY; Yale Cancer Center, Yale School of Medicine, New Haven, CT; University of Alabama at Birmingham, Birmingham, AL; Cedars-Sinai Medical Center, Los Angeles, CA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Dana-Farber Cancer Institute, Boston, MA; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Columbia University Medical Center, New York, New York, NY; Virginia Piper Cancer Institute, Allina Health, Minneapolis, MN; Mayo Clinic, Rochester, MN; University of California, Los Angeles, Los Angeles, CA; Texas Oncology, San Antonio, TX; Washington University in St. Louis, St. Louis, MO; US Oncology Denver, Denver, CO; Moffitt Cancer Center, Tampa, FL; Virginia G. Piper Cancer Care Network, Scottsdale, AZ; University of Chicago, Chicago, IL; Baylor University Medical Center, Texas Oncology, US Oncology, Dallas, TX; Seattle Genetics, Inc., Bothell, WA; Seattle Cancer Care Allia
| | - K Kalinsky
- Memorial Sloan Kettering Cancer Center, New York, NY; Yale Cancer Center, Yale School of Medicine, New Haven, CT; University of Alabama at Birmingham, Birmingham, AL; Cedars-Sinai Medical Center, Los Angeles, CA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Dana-Farber Cancer Institute, Boston, MA; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Columbia University Medical Center, New York, New York, NY; Virginia Piper Cancer Institute, Allina Health, Minneapolis, MN; Mayo Clinic, Rochester, MN; University of California, Los Angeles, Los Angeles, CA; Texas Oncology, San Antonio, TX; Washington University in St. Louis, St. Louis, MO; US Oncology Denver, Denver, CO; Moffitt Cancer Center, Tampa, FL; Virginia G. Piper Cancer Care Network, Scottsdale, AZ; University of Chicago, Chicago, IL; Baylor University Medical Center, Texas Oncology, US Oncology, Dallas, TX; Seattle Genetics, Inc., Bothell, WA; Seattle Cancer Care Allia
| | - M Tsai
- Memorial Sloan Kettering Cancer Center, New York, NY; Yale Cancer Center, Yale School of Medicine, New Haven, CT; University of Alabama at Birmingham, Birmingham, AL; Cedars-Sinai Medical Center, Los Angeles, CA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Dana-Farber Cancer Institute, Boston, MA; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Columbia University Medical Center, New York, New York, NY; Virginia Piper Cancer Institute, Allina Health, Minneapolis, MN; Mayo Clinic, Rochester, MN; University of California, Los Angeles, Los Angeles, CA; Texas Oncology, San Antonio, TX; Washington University in St. Louis, St. Louis, MO; US Oncology Denver, Denver, CO; Moffitt Cancer Center, Tampa, FL; Virginia G. Piper Cancer Care Network, Scottsdale, AZ; University of Chicago, Chicago, IL; Baylor University Medical Center, Texas Oncology, US Oncology, Dallas, TX; Seattle Genetics, Inc., Bothell, WA; Seattle Cancer Care Allia
| | - MC Liu
- Memorial Sloan Kettering Cancer Center, New York, NY; Yale Cancer Center, Yale School of Medicine, New Haven, CT; University of Alabama at Birmingham, Birmingham, AL; Cedars-Sinai Medical Center, Los Angeles, CA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Dana-Farber Cancer Institute, Boston, MA; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Columbia University Medical Center, New York, New York, NY; Virginia Piper Cancer Institute, Allina Health, Minneapolis, MN; Mayo Clinic, Rochester, MN; University of California, Los Angeles, Los Angeles, CA; Texas Oncology, San Antonio, TX; Washington University in St. Louis, St. Louis, MO; US Oncology Denver, Denver, CO; Moffitt Cancer Center, Tampa, FL; Virginia G. Piper Cancer Care Network, Scottsdale, AZ; University of Chicago, Chicago, IL; Baylor University Medical Center, Texas Oncology, US Oncology, Dallas, TX; Seattle Genetics, Inc., Bothell, WA; Seattle Cancer Care Allia
| | - SA Hurvitz
- Memorial Sloan Kettering Cancer Center, New York, NY; Yale Cancer Center, Yale School of Medicine, New Haven, CT; University of Alabama at Birmingham, Birmingham, AL; Cedars-Sinai Medical Center, Los Angeles, CA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Dana-Farber Cancer Institute, Boston, MA; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Columbia University Medical Center, New York, New York, NY; Virginia Piper Cancer Institute, Allina Health, Minneapolis, MN; Mayo Clinic, Rochester, MN; University of California, Los Angeles, Los Angeles, CA; Texas Oncology, San Antonio, TX; Washington University in St. Louis, St. Louis, MO; US Oncology Denver, Denver, CO; Moffitt Cancer Center, Tampa, FL; Virginia G. Piper Cancer Care Network, Scottsdale, AZ; University of Chicago, Chicago, IL; Baylor University Medical Center, Texas Oncology, US Oncology, Dallas, TX; Seattle Genetics, Inc., Bothell, WA; Seattle Cancer Care Allia
| | - S Wilks
- Memorial Sloan Kettering Cancer Center, New York, NY; Yale Cancer Center, Yale School of Medicine, New Haven, CT; University of Alabama at Birmingham, Birmingham, AL; Cedars-Sinai Medical Center, Los Angeles, CA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Dana-Farber Cancer Institute, Boston, MA; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Columbia University Medical Center, New York, New York, NY; Virginia Piper Cancer Institute, Allina Health, Minneapolis, MN; Mayo Clinic, Rochester, MN; University of California, Los Angeles, Los Angeles, CA; Texas Oncology, San Antonio, TX; Washington University in St. Louis, St. Louis, MO; US Oncology Denver, Denver, CO; Moffitt Cancer Center, Tampa, FL; Virginia G. Piper Cancer Care Network, Scottsdale, AZ; University of Chicago, Chicago, IL; Baylor University Medical Center, Texas Oncology, US Oncology, Dallas, TX; Seattle Genetics, Inc., Bothell, WA; Seattle Cancer Care Allia
| | - F Ademuyiwa
- Memorial Sloan Kettering Cancer Center, New York, NY; Yale Cancer Center, Yale School of Medicine, New Haven, CT; University of Alabama at Birmingham, Birmingham, AL; Cedars-Sinai Medical Center, Los Angeles, CA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Dana-Farber Cancer Institute, Boston, MA; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Columbia University Medical Center, New York, New York, NY; Virginia Piper Cancer Institute, Allina Health, Minneapolis, MN; Mayo Clinic, Rochester, MN; University of California, Los Angeles, Los Angeles, CA; Texas Oncology, San Antonio, TX; Washington University in St. Louis, St. Louis, MO; US Oncology Denver, Denver, CO; Moffitt Cancer Center, Tampa, FL; Virginia G. Piper Cancer Care Network, Scottsdale, AZ; University of Chicago, Chicago, IL; Baylor University Medical Center, Texas Oncology, US Oncology, Dallas, TX; Seattle Genetics, Inc., Bothell, WA; Seattle Cancer Care Allia
| | - S Diab
- Memorial Sloan Kettering Cancer Center, New York, NY; Yale Cancer Center, Yale School of Medicine, New Haven, CT; University of Alabama at Birmingham, Birmingham, AL; Cedars-Sinai Medical Center, Los Angeles, CA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Dana-Farber Cancer Institute, Boston, MA; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Columbia University Medical Center, New York, New York, NY; Virginia Piper Cancer Institute, Allina Health, Minneapolis, MN; Mayo Clinic, Rochester, MN; University of California, Los Angeles, Los Angeles, CA; Texas Oncology, San Antonio, TX; Washington University in St. Louis, St. Louis, MO; US Oncology Denver, Denver, CO; Moffitt Cancer Center, Tampa, FL; Virginia G. Piper Cancer Care Network, Scottsdale, AZ; University of Chicago, Chicago, IL; Baylor University Medical Center, Texas Oncology, US Oncology, Dallas, TX; Seattle Genetics, Inc., Bothell, WA; Seattle Cancer Care Allia
| | - HS Han
- Memorial Sloan Kettering Cancer Center, New York, NY; Yale Cancer Center, Yale School of Medicine, New Haven, CT; University of Alabama at Birmingham, Birmingham, AL; Cedars-Sinai Medical Center, Los Angeles, CA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Dana-Farber Cancer Institute, Boston, MA; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Columbia University Medical Center, New York, New York, NY; Virginia Piper Cancer Institute, Allina Health, Minneapolis, MN; Mayo Clinic, Rochester, MN; University of California, Los Angeles, Los Angeles, CA; Texas Oncology, San Antonio, TX; Washington University in St. Louis, St. Louis, MO; US Oncology Denver, Denver, CO; Moffitt Cancer Center, Tampa, FL; Virginia G. Piper Cancer Care Network, Scottsdale, AZ; University of Chicago, Chicago, IL; Baylor University Medical Center, Texas Oncology, US Oncology, Dallas, TX; Seattle Genetics, Inc., Bothell, WA; Seattle Cancer Care Allia
| | - G Kato
- Memorial Sloan Kettering Cancer Center, New York, NY; Yale Cancer Center, Yale School of Medicine, New Haven, CT; University of Alabama at Birmingham, Birmingham, AL; Cedars-Sinai Medical Center, Los Angeles, CA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Dana-Farber Cancer Institute, Boston, MA; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Columbia University Medical Center, New York, New York, NY; Virginia Piper Cancer Institute, Allina Health, Minneapolis, MN; Mayo Clinic, Rochester, MN; University of California, Los Angeles, Los Angeles, CA; Texas Oncology, San Antonio, TX; Washington University in St. Louis, St. Louis, MO; US Oncology Denver, Denver, CO; Moffitt Cancer Center, Tampa, FL; Virginia G. Piper Cancer Care Network, Scottsdale, AZ; University of Chicago, Chicago, IL; Baylor University Medical Center, Texas Oncology, US Oncology, Dallas, TX; Seattle Genetics, Inc., Bothell, WA; Seattle Cancer Care Allia
| | - R Nanda
- Memorial Sloan Kettering Cancer Center, New York, NY; Yale Cancer Center, Yale School of Medicine, New Haven, CT; University of Alabama at Birmingham, Birmingham, AL; Cedars-Sinai Medical Center, Los Angeles, CA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Dana-Farber Cancer Institute, Boston, MA; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Columbia University Medical Center, New York, New York, NY; Virginia Piper Cancer Institute, Allina Health, Minneapolis, MN; Mayo Clinic, Rochester, MN; University of California, Los Angeles, Los Angeles, CA; Texas Oncology, San Antonio, TX; Washington University in St. Louis, St. Louis, MO; US Oncology Denver, Denver, CO; Moffitt Cancer Center, Tampa, FL; Virginia G. Piper Cancer Care Network, Scottsdale, AZ; University of Chicago, Chicago, IL; Baylor University Medical Center, Texas Oncology, US Oncology, Dallas, TX; Seattle Genetics, Inc., Bothell, WA; Seattle Cancer Care Allia
| | - J O'Shaughnessy
- Memorial Sloan Kettering Cancer Center, New York, NY; Yale Cancer Center, Yale School of Medicine, New Haven, CT; University of Alabama at Birmingham, Birmingham, AL; Cedars-Sinai Medical Center, Los Angeles, CA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Dana-Farber Cancer Institute, Boston, MA; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Columbia University Medical Center, New York, New York, NY; Virginia Piper Cancer Institute, Allina Health, Minneapolis, MN; Mayo Clinic, Rochester, MN; University of California, Los Angeles, Los Angeles, CA; Texas Oncology, San Antonio, TX; Washington University in St. Louis, St. Louis, MO; US Oncology Denver, Denver, CO; Moffitt Cancer Center, Tampa, FL; Virginia G. Piper Cancer Care Network, Scottsdale, AZ; University of Chicago, Chicago, IL; Baylor University Medical Center, Texas Oncology, US Oncology, Dallas, TX; Seattle Genetics, Inc., Bothell, WA; Seattle Cancer Care Allia
| | - A Kostic
- Memorial Sloan Kettering Cancer Center, New York, NY; Yale Cancer Center, Yale School of Medicine, New Haven, CT; University of Alabama at Birmingham, Birmingham, AL; Cedars-Sinai Medical Center, Los Angeles, CA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Dana-Farber Cancer Institute, Boston, MA; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Columbia University Medical Center, New York, New York, NY; Virginia Piper Cancer Institute, Allina Health, Minneapolis, MN; Mayo Clinic, Rochester, MN; University of California, Los Angeles, Los Angeles, CA; Texas Oncology, San Antonio, TX; Washington University in St. Louis, St. Louis, MO; US Oncology Denver, Denver, CO; Moffitt Cancer Center, Tampa, FL; Virginia G. Piper Cancer Care Network, Scottsdale, AZ; University of Chicago, Chicago, IL; Baylor University Medical Center, Texas Oncology, US Oncology, Dallas, TX; Seattle Genetics, Inc., Bothell, WA; Seattle Cancer Care Allia
| | - M Li
- Memorial Sloan Kettering Cancer Center, New York, NY; Yale Cancer Center, Yale School of Medicine, New Haven, CT; University of Alabama at Birmingham, Birmingham, AL; Cedars-Sinai Medical Center, Los Angeles, CA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Dana-Farber Cancer Institute, Boston, MA; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Columbia University Medical Center, New York, New York, NY; Virginia Piper Cancer Institute, Allina Health, Minneapolis, MN; Mayo Clinic, Rochester, MN; University of California, Los Angeles, Los Angeles, CA; Texas Oncology, San Antonio, TX; Washington University in St. Louis, St. Louis, MO; US Oncology Denver, Denver, CO; Moffitt Cancer Center, Tampa, FL; Virginia G. Piper Cancer Care Network, Scottsdale, AZ; University of Chicago, Chicago, IL; Baylor University Medical Center, Texas Oncology, US Oncology, Dallas, TX; Seattle Genetics, Inc., Bothell, WA; Seattle Cancer Care Allia
| | - J Specht
- Memorial Sloan Kettering Cancer Center, New York, NY; Yale Cancer Center, Yale School of Medicine, New Haven, CT; University of Alabama at Birmingham, Birmingham, AL; Cedars-Sinai Medical Center, Los Angeles, CA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Dana-Farber Cancer Institute, Boston, MA; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Columbia University Medical Center, New York, New York, NY; Virginia Piper Cancer Institute, Allina Health, Minneapolis, MN; Mayo Clinic, Rochester, MN; University of California, Los Angeles, Los Angeles, CA; Texas Oncology, San Antonio, TX; Washington University in St. Louis, St. Louis, MO; US Oncology Denver, Denver, CO; Moffitt Cancer Center, Tampa, FL; Virginia G. Piper Cancer Care Network, Scottsdale, AZ; University of Chicago, Chicago, IL; Baylor University Medical Center, Texas Oncology, US Oncology, Dallas, TX; Seattle Genetics, Inc., Bothell, WA; Seattle Cancer Care Allia
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Sittig M, David J, Yoshida E, Reznik R, McArthur H, Chung A, Mita M, Amersi F, Giuliano A, Cook-Wiens G, Shiao S. Effect of Age in Young Women With Stage I-III Triple-Negative Breast Cancer: A Report From the National Cancer Database. Int J Radiat Oncol Biol Phys 2017. [DOI: 10.1016/j.ijrobp.2017.06.702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Yamamoto K, Kiyomoto M, Katayama H, Mita M. Radioimmunoassay of relaxin-like gonad-stimulating peptide in the starfish Patiria (=Asterina) pectinifera. Gen Comp Endocrinol 2017; 243:84-88. [PMID: 27838378 DOI: 10.1016/j.ygcen.2016.11.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Revised: 11/05/2016] [Accepted: 11/08/2016] [Indexed: 10/20/2022]
Abstract
A relaxin-like gonad-stimulating peptide (RGP) from starfish Patiria (=Asterina) pectinifera is the first identified invertebrate gonadotropin for final gamete maturation. An antiserum against P. pectinifera RGP (PpeRGP) was produced by immunizing rabbits with a PpeRGP sulfanyl-polyethylene glycol derivative conjugated with keyhole limpet hemocyanin (KLH) as the antigen. The antiserum was used for the development of a specific and sensitive radioimmunoassay (RIA) for the measurement of RGP. In binding experiments using radioiodinated PpeRGP and antiserum against PpeRGP, a displacement curve was obtained using radioinert PpeRGP. The sensitivity of the RIA, defined as the amount of PpeRGP that significantly decreased the counts by 2 SD from the 100% bound point, averaged 0.040±0.002pmol PpeRGP per 100μl assay buffer (0.40±0.02nM) in 10 assays. Intra-assay and inter-assay coefficients of variation were 6.1% and 2.7%, respectively. Serial dilution of whole homogenates from the radial nerve cords and circumoral nerve-rings of P. pectinifera produced displacement curves parallel to the PpeRGP standard. Thus, the amounts of PpeRGP were determined as 1.54±0.09pmol/mg wet weight of radial nerves and 0.87±0.04pmol/mg wet weight of nerve-rings, respectively. On contrary, pyloric stomach, pyloric caeca, tube-feet, ovaries, testes, and ovarian follicle cells did not react in the RIA system. Furthermore, the A- and B-chains of PpeRGP, Asterias amurensis RGP, bovine insulin, and human relaxin did not show cross-reactivity in the RIA. These results strongly suggest that the RIA system is a highly specific and sensitive with respect to PpeRGP.
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Affiliation(s)
- Kazutoshi Yamamoto
- Department of Biology, Faculty of Education and Integrated Sciences, Center for Advanced Biomedical Sciences, Waseda University, Wakamatsucho 2-2, Shinjuku-ku, Tokyo 162-8480, Japan
| | - Masato Kiyomoto
- Tateyama Marine Laboratory, Marine and Coastal Research Center, Ochanomizu University, Kou-yatsu 11, Tateyama, Chiba 294-0301, Japan
| | - Hidekazu Katayama
- Department of Applied Biochemistry, School of Engineering, Tokai University, Kitakaname 4-1-1, Hiratsuka, Kanagawa 259-1292, Japan
| | - Masatoshi Mita
- Department of Biology, Faculty of Education, Tokyo Gakugei University, Nukuikita-machi 4-1-1, Koganei-shi, Tokyo 184-8501, Japan.
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Forero-Torres A, Modi S, Specht J, Miller K, Weise A, Burris H, Liu M, Krop I, Pusztai L, Kostic A, Li M, Mita M. Abstract P6-12-04: Phase 1 study of the antibody-drug conjugate (ADC) SGN-LIV1A in patients with heavily pretreated metastatic breast cancer. Cancer Res 2017. [DOI: 10.1158/1538-7445.sabcs16-p6-12-04] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background
LIV-1, a transmembrane protein and downstream target of STAT3, is highly expressed in breast cancer cells. It is associated with lymph node involvement and metastatic progression. SGN-LIV1A is an anti-LIV-1 antibody conjugated via a protease-cleavable linker to monomethyl auristatin E (MMAE). Upon binding to cell-surface LIV-1, SGN-LIV1A is internalized and releases MMAE, which binds to tubulin and induces G2/M arrest and apoptosis.
Methods
This is an ongoing, phase 1 dose-escalation study evaluating safety, tolerability, pharmacokinetics, and antitumor activity of SGN-LIV1A (q3 wks IV) in women with LIV-1-positive, unresectable, locally advanced or metastatic breast cancer (LA/MBC) (NCT01969643). Patients (pts) with measurable disease and ≥2 prior cytotoxic regimens for LA/MBC were eligible. Pts with ≥Grade 2 neuropathy were excluded. Response was assessed per RECIST v1.1; pts with stable disease (SD) or better could continue treatment until disease progression or intolerable toxicity. At completion of dose escalation in hormone receptor-positive/HER2-negative (HR+/HER2–) and triple-negative (TN) pts, expansion cohorts were opened to further evaluate safety and antitumor activity of monotherapy in TN pts and combination therapy with trastuzumab (Tz) in HER2-positive (HER2+) pts. Pre- and post-treatment tumor biopsies were done to evaluate LIV-1 expression and other correlative endpoints.
Results
To date, 39 pts (18 HR+/HER2–, 21 TN) have received a median of 3 cycles (range, 1–10) of SGN-LIV1A monotherapy at doses of 0.5–2.8 mg/kg. Median age was 57 yrs (range, 33–79). At baseline, pts had a median of 4 prior cytotoxic regimens for LA/MBC (range, 2–8); 36 had visceral disease and 25 had bone involvement. No dose-limiting toxicities (DLT) occurred in 19 DLT-evaluable pts; maximum tolerated dose was not exceeded at 2.8 mg/kg. Treatment-emergent adverse events (AEs) reported in ≥30% of pts were: fatigue (64%), nausea (54%), alopecia (46%), decreased appetite (41%), constipation (39%), neutropenia (33%), and vomiting (31%). Peripheral neuropathy was reported in 9 pts (23%). Most AEs were Grade 1/2, except neutropenia (all ≥Grade 3). Four pts discontinued treatment due to AEs (acute respiratory distress syndrome, nausea, pneumonia, tachycardia). In dose escalation, modest activity was observed in 17 efficacy evaluable (EE) HR+/HER2- pts, with a disease control rate (DCR) of 59% (10 SD), including 1 pt with SD≥24 wks. Among the 17 EE TN pts (dose escalation plus cohort expansion), the overall response rate (ORR) was 41% (7 PR), DCR was 82% (7 PR, 7 SD) and clinical benefit rate (CBR=OR+SD≥24 wks) was 53% (9 pts). For TN pts, median PFS was 17.1 wks (95% CI: 6.0, 18.4); 6 pts remain on treatment.
Of 281 MBC tumor samples evaluated for LIV-1, 93% were positive; 81% had moderate-to-high expression (H-score ≥100).
Conclusions
LIV-1 is expressed in almost all MBC tumors. SGN-LIV1A monotherapy has been generally well tolerated and shown encouraging antitumor activity in heavily pretreated TN MBC, with a PR rate of 41% and a CBR at ≥24 wks of 53%. Response duration data continue to evolve. Enrollment continues in the TN monotherapy expansion cohort and the HER2+ combination cohort with Tz.
Citation Format: Forero-Torres A, Modi S, Specht J, Miller K, Weise A, Burris III H, Liu M, Krop I, Pusztai L, Kostic A, Li M, Mita M. Phase 1 study of the antibody-drug conjugate (ADC) SGN-LIV1A in patients with heavily pretreated metastatic breast cancer [abstract]. In: Proceedings of the 2016 San Antonio Breast Cancer Symposium; 2016 Dec 6-10; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2017;77(4 Suppl):Abstract nr P6-12-04.
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Affiliation(s)
- A Forero-Torres
- University of Alabama at Birmingham, Birmingham, AL; Memorial Sloan Kettering Cancer Center, New York, NY; Seattle Cancer Care Alliance, University of Washington, Seattle, WA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Mayo Clinic, Rochester, MN; Dana-Farber Cancer Institute, Boston, MA; Yale University School of Medicine, New Haven, CT; Seattle Genetics, Inc., Bothell, WA; Cedars-Sinai Medical Center, Los Angeles, CA
| | - S Modi
- University of Alabama at Birmingham, Birmingham, AL; Memorial Sloan Kettering Cancer Center, New York, NY; Seattle Cancer Care Alliance, University of Washington, Seattle, WA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Mayo Clinic, Rochester, MN; Dana-Farber Cancer Institute, Boston, MA; Yale University School of Medicine, New Haven, CT; Seattle Genetics, Inc., Bothell, WA; Cedars-Sinai Medical Center, Los Angeles, CA
| | - J Specht
- University of Alabama at Birmingham, Birmingham, AL; Memorial Sloan Kettering Cancer Center, New York, NY; Seattle Cancer Care Alliance, University of Washington, Seattle, WA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Mayo Clinic, Rochester, MN; Dana-Farber Cancer Institute, Boston, MA; Yale University School of Medicine, New Haven, CT; Seattle Genetics, Inc., Bothell, WA; Cedars-Sinai Medical Center, Los Angeles, CA
| | - K Miller
- University of Alabama at Birmingham, Birmingham, AL; Memorial Sloan Kettering Cancer Center, New York, NY; Seattle Cancer Care Alliance, University of Washington, Seattle, WA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Mayo Clinic, Rochester, MN; Dana-Farber Cancer Institute, Boston, MA; Yale University School of Medicine, New Haven, CT; Seattle Genetics, Inc., Bothell, WA; Cedars-Sinai Medical Center, Los Angeles, CA
| | - A Weise
- University of Alabama at Birmingham, Birmingham, AL; Memorial Sloan Kettering Cancer Center, New York, NY; Seattle Cancer Care Alliance, University of Washington, Seattle, WA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Mayo Clinic, Rochester, MN; Dana-Farber Cancer Institute, Boston, MA; Yale University School of Medicine, New Haven, CT; Seattle Genetics, Inc., Bothell, WA; Cedars-Sinai Medical Center, Los Angeles, CA
| | - H Burris
- University of Alabama at Birmingham, Birmingham, AL; Memorial Sloan Kettering Cancer Center, New York, NY; Seattle Cancer Care Alliance, University of Washington, Seattle, WA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Mayo Clinic, Rochester, MN; Dana-Farber Cancer Institute, Boston, MA; Yale University School of Medicine, New Haven, CT; Seattle Genetics, Inc., Bothell, WA; Cedars-Sinai Medical Center, Los Angeles, CA
| | - M Liu
- University of Alabama at Birmingham, Birmingham, AL; Memorial Sloan Kettering Cancer Center, New York, NY; Seattle Cancer Care Alliance, University of Washington, Seattle, WA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Mayo Clinic, Rochester, MN; Dana-Farber Cancer Institute, Boston, MA; Yale University School of Medicine, New Haven, CT; Seattle Genetics, Inc., Bothell, WA; Cedars-Sinai Medical Center, Los Angeles, CA
| | - I Krop
- University of Alabama at Birmingham, Birmingham, AL; Memorial Sloan Kettering Cancer Center, New York, NY; Seattle Cancer Care Alliance, University of Washington, Seattle, WA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Mayo Clinic, Rochester, MN; Dana-Farber Cancer Institute, Boston, MA; Yale University School of Medicine, New Haven, CT; Seattle Genetics, Inc., Bothell, WA; Cedars-Sinai Medical Center, Los Angeles, CA
| | - L Pusztai
- University of Alabama at Birmingham, Birmingham, AL; Memorial Sloan Kettering Cancer Center, New York, NY; Seattle Cancer Care Alliance, University of Washington, Seattle, WA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Mayo Clinic, Rochester, MN; Dana-Farber Cancer Institute, Boston, MA; Yale University School of Medicine, New Haven, CT; Seattle Genetics, Inc., Bothell, WA; Cedars-Sinai Medical Center, Los Angeles, CA
| | - A Kostic
- University of Alabama at Birmingham, Birmingham, AL; Memorial Sloan Kettering Cancer Center, New York, NY; Seattle Cancer Care Alliance, University of Washington, Seattle, WA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Mayo Clinic, Rochester, MN; Dana-Farber Cancer Institute, Boston, MA; Yale University School of Medicine, New Haven, CT; Seattle Genetics, Inc., Bothell, WA; Cedars-Sinai Medical Center, Los Angeles, CA
| | - M Li
- University of Alabama at Birmingham, Birmingham, AL; Memorial Sloan Kettering Cancer Center, New York, NY; Seattle Cancer Care Alliance, University of Washington, Seattle, WA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Mayo Clinic, Rochester, MN; Dana-Farber Cancer Institute, Boston, MA; Yale University School of Medicine, New Haven, CT; Seattle Genetics, Inc., Bothell, WA; Cedars-Sinai Medical Center, Los Angeles, CA
| | - M Mita
- University of Alabama at Birmingham, Birmingham, AL; Memorial Sloan Kettering Cancer Center, New York, NY; Seattle Cancer Care Alliance, University of Washington, Seattle, WA; Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN; Karmanos Cancer Institute, Detroit, MI; Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN; Mayo Clinic, Rochester, MN; Dana-Farber Cancer Institute, Boston, MA; Yale University School of Medicine, New Haven, CT; Seattle Genetics, Inc., Bothell, WA; Cedars-Sinai Medical Center, Los Angeles, CA
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Mita M. Inhibitory mechanism of l
-glutamic acid on spawning of the starfish Patiria
(Asterina
) pectinifera. Mol Reprod Dev 2017; 84:246-256. [DOI: 10.1002/mrd.22769] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Accepted: 12/17/2016] [Indexed: 11/07/2022]
Affiliation(s)
- Masatoshi Mita
- Department of Biology; Faculty of Education; Tokyo Gakugei University; Koganei Tokyo Japan
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Lin M, Mita M, Egertová M, Zampronio CG, Jones AM, Elphick MR. Cellular localization of relaxin-like gonad-stimulating peptide expression in Asterias rubens: New insights into neurohormonal control of spawning in starfish. J Comp Neurol 2016; 525:1599-1617. [PMID: 27806429 PMCID: PMC5396301 DOI: 10.1002/cne.24141] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 10/25/2016] [Accepted: 10/26/2016] [Indexed: 02/04/2023]
Abstract
Gamete maturation and spawning in starfish is triggered by a gonad-stimulating substance (GSS), which is present in extracts of the radial nerve cords. Purification of GSS from the starfish Patiria pectinifera identified GSS as a relaxin-like polypeptide, which is now known as relaxin-like gonad-stimulating peptide (RGP). Cells expressing RGP in the radial nerve cord of P. pectinifera have been visualized, but the presence of RGP-expressing cells in other parts of the starfish body has not been investigated. Here we addressed this issue in the starfish Asterias rubens. An A. rubens RGP (AruRGP) precursor cDNA was sequenced and the A chain and B chain that form AruRGP were detected in A. rubens radial nerve cord extracts using mass spectrometry. Comparison of the bioactivity of AruRGP and P. pectinifera RGP (PpeRGP) revealed that both polypeptides induce oocyte maturation and ovulation in A. rubens ovarian fragments, but AruRGP is more potent than PpeRGP. Analysis of the expression of AruRGP in A. rubens using mRNA in situ hybridization revealed cells expressing RGP in the radial nerve cords, circumoral nerve ring, and tube feet. Furthermore, a band of RGP-expressing cells was identified in the body wall epithelium lining the cavity that surrounds the sensory terminal tentacle and optic cushion at the tips of the arms. Discovery of these RGP-expressing cells closely associated with sensory organs in the arm tips is an important finding because these cells are candidate physiological mediators for hormonal control of starfish spawning in response to environmental cues. J. Comp. Neurol. 525:1599-1617, 2017. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Ming Lin
- Queen Mary University of London, School of Biological & Chemical Sciences, London, UK
| | - Masatoshi Mita
- Department of Biology, Faculty of Education, Tokyo Gakugei University, Tokyo, Japan
| | - Michaela Egertová
- Queen Mary University of London, School of Biological & Chemical Sciences, London, UK
| | - Cleidiane G Zampronio
- School of Life Sciences and Proteomics Research Technology Platform, University of Warwick, Coventry, UK
| | - Alexandra M Jones
- School of Life Sciences and Proteomics Research Technology Platform, University of Warwick, Coventry, UK
| | - Maurice R Elphick
- Queen Mary University of London, School of Biological & Chemical Sciences, London, UK
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Katayama H, Mita M. A sulfanyl-PEG derivative of relaxin-like peptide utilizable for the conjugation with KLH and the antibody production. Bioorg Med Chem 2016; 24:3596-602. [DOI: 10.1016/j.bmc.2016.05.068] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2016] [Revised: 05/20/2016] [Accepted: 05/30/2016] [Indexed: 11/16/2022]
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Abstract
Relaxin-like gonad-stimulating peptide (RGP) of starfish Patiria (= Asterina) pectinifera is the first identified invertebrate gonadotropin to trigger final gamete maturation. Recently, chemical structures of RGP were identified in several species of starfish. Three kinds of RGP molecules are found in the class Asteroidea. The chemical structure of P. pectinifera RGP (PpeRGP) is conserved among starfish of the order Valvatida beyond species. In contrast, the chemical structures of RGP identified in Asterias amurensis and Aphelasterias japonica of the order Forcipulatida are quite different from that of PpeRGP. The chemical structure of RGP in A. amurensis (AamRGP) is exactly the same as that in Asterias rubens (the order Forcipulatida), Astropecten scoparius (the order Paxillosida), Astropecten polyacanthus (the order Paxillosida), and Echinaster luzonicus (the order Spinulosida). The chemical structure of Coscinasterias acutispina RGP (the order Forcipulatida) is consistent with that of A. japonica RGP (AjaRGP). In cross-experiments using P. pectinifera, A. amurensis, and A. japonica ovaries, AamRGP and AjaRGP can induce each species of ovaries. Neither AamRGP nor AjaRGP induce oocyte maturation and ovulation in the ovary of P. pectinifera, although the PpeRGP is active in ovaries of A. amurensis and A. japonica. This suggests that the AamRGP and AjaRGP partly act species specificity.
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Affiliation(s)
- Masatoshi Mita
- Department of Biology, Faculty of Education, Tokyo Gakugei University, Nukuikita-machi 4-1-1, Koganei-shi, Tokyo 184-8501, Japan.
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Mita M, Katayama H. A relaxin-like gonad-stimulating peptide from the starfish Aphelasterias japonica. Gen Comp Endocrinol 2016; 229:56-61. [PMID: 26944483 DOI: 10.1016/j.ygcen.2016.02.025] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Revised: 02/19/2016] [Accepted: 02/29/2016] [Indexed: 11/21/2022]
Abstract
Relaxin-like gonad-stimulating peptide (RGP) in starfish is the first identified invertebrate gonadotropin responsible for final gamete maturation. In this study, a new ortholog RGP was identified from Aphelasterias japonica. The DNA sequence encoding A. japonica RGP (AjaRGP) consists of 342 base pairs with an open reading frame encoding a peptide of 113 amino acids (aa), including a signal peptide (26aa), B-chain (20aa), C-peptide (42aa), and A-chain (25aa). AjaRGP is a heterodimeric peptide with disulfide cross-linkages. Comparing with Asterias amurensis RGP (AamRGP) and Patiria (=Asterina) pectinifera RGP (PpeRGP), the amino acid identity levels of AjaRGP with respect to AamRGP and PpeRGP are 84% and 58% for the A-chain and 90% and 68% for the B-chain, respectively. This suggests that AjaRGP is closer to AmaRGP rather than PpeRGP. Although chemical synthetic AjaRGP can induce gamete spawning and oocyte maturation in ovarian fragments of A. japonica, the ovary of P. pectinifera fails to respond to AjaRGP. This suggests that AjaRGP acts species-specifically.
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Affiliation(s)
- Masatoshi Mita
- Department of Biology, Faculty of Education, Tokyo Gakugei University, Nukuikita-machi 4-1-1, Koganei-shi, Tokyo 184-8501, Japan.
| | - Hidekazu Katayama
- Department of Applied Biochemistry, School of Engineering, Tokai University, 4-1-1, Kitakaname, Hiratuska, Kanagawa 259-1292, Japan
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Haraguchi S, Ikeda N, Abe M, Tsutsui K, Mita M. Nucleotide sequence and expression of relaxin-like gonad-stimulating peptide gene in starfish Asterina pectinifera. Gen Comp Endocrinol 2016; 227:115-9. [PMID: 26166482 DOI: 10.1016/j.ygcen.2015.06.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2015] [Revised: 06/09/2015] [Accepted: 06/29/2015] [Indexed: 10/23/2022]
Abstract
Starfish gonad-stimulating substance (GSS) is the only known invertebrate peptide hormone responsible for final gamete maturation, rendering it functionally analogous to gonadotropins in vertebrates. Because GSS belongs to the relaxin-like peptide family, we propose renaming for starfish gonadotropic hormone as relaxin-like gonad-stimulating peptide (RGP). This study examined the primary structure and expression regulation of the RGP gene in starfish Asterina pectinifera. RGP consisted of 3896 base pairs (bp) divided over two exons, exon 1 of 208 bp and exon 2 of 2277 bp, and one intron of 1411 bp. Promoter sequences, CAAT and TATA boxes, were present in the 5'-upstream region of the coding DNA sequence of RGP. The transcript was 2485 bases (b) in length. The AAUAAA polyadenylation signal was found in 3'-untranslated region over 2kb away from the stop codon. This showed that only 14% of the RGP mRNA was translated into the peptide, because a size of the open-reading frame was 351 b. Furthermore, an analysis by using real-time quantitative PCR with specific primers for RGP showed that mRNA of RGP was expressed at high levels in the radial nerves. Expression was also observed in the cardiac stomachs, although the level was low, and trace levels were detected in the gonads, pyloric caeca and tube feet. This result suggests that the RGP gene is transcribed mainly in the radial nerves of A. pectinifera.
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Affiliation(s)
- Shogo Haraguchi
- Department of Biology, Faculty of Education, Tokyo Gakugei University, Nukuikita-machi 4-1-1, Koganei-shi, Tokyo 184-8501, Japan; Laboratory of Integrative Brain Sciences, Department of Biology and Center for Medical Life Science, Waseda University, Wakamatsucho 2-2, Shinjuku-ku, Tokyo 162-8480, Japan
| | - Narumi Ikeda
- Department of Biology, Faculty of Education, Tokyo Gakugei University, Nukuikita-machi 4-1-1, Koganei-shi, Tokyo 184-8501, Japan
| | - Michiko Abe
- Department of Biology, Faculty of Education, Tokyo Gakugei University, Nukuikita-machi 4-1-1, Koganei-shi, Tokyo 184-8501, Japan
| | - Kazuyoshi Tsutsui
- Laboratory of Integrative Brain Sciences, Department of Biology and Center for Medical Life Science, Waseda University, Wakamatsucho 2-2, Shinjuku-ku, Tokyo 162-8480, Japan
| | - Masatoshi Mita
- Department of Biology, Faculty of Education, Tokyo Gakugei University, Nukuikita-machi 4-1-1, Koganei-shi, Tokyo 184-8501, Japan.
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Mita M, Daiya M, Haraguchi S, Tsutsui K, Nagahama Y. A new relaxin-like gonad-stimulating peptide identified in the starfish Asterias amurensis. Gen Comp Endocrinol 2015; 222:144-9. [PMID: 26163025 DOI: 10.1016/j.ygcen.2015.07.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Revised: 06/12/2015] [Accepted: 07/06/2015] [Indexed: 10/23/2022]
Abstract
Relaxin-like gonad-stimulating peptide (RGP) of starfish Asterina pectinifera was the first invertebrate gonadotropin to have its chemical structure identified. However, it is unclear whether gonadotropic hormones in other species starfish are relaxin-like peptides. Thus, this study tried to identify the molecular structure of gonadotropic hormone in Asterias amurensis. As a result, we identified A. amurensis gonadotropic hormone as the RGP (AamRGP). The DNA sequence encoding AamRGP consisted of 330 base pairs with an open reading frame encoding a peptide of 109 amino acids (aa), including a signal peptide (26 aa), B-chain (20 aa), C-peptide (38 aa) and A-chain (25 aa). Comparing with A. pectinifera RGP (ApeRGP), the amino acid identity levels between AmaRGP and ApeRGP were 58% for the A-chain and 73% for the B-chain. Furthermore, chemical synthetic AamRGP induced gamete spawning and oocyte maturation in ovarian fragments of A. amurensis. In contrast, the ovary of A. pectinifera failed to respond to the AamRGP. This suggested that AamRGP is a new relaxin-like peptide.
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Affiliation(s)
- Masatoshi Mita
- Department of Biology, Faculty of Education, Tokyo Gakugei University, Nukuikita-machi 4-1-1, Koganei-shi, Tokyo 184-8501, Japan.
| | - Misaki Daiya
- Department of Biology, Faculty of Education, Tokyo Gakugei University, Nukuikita-machi 4-1-1, Koganei-shi, Tokyo 184-8501, Japan
| | - Shogo Haraguchi
- Department of Biology, Faculty of Education, Tokyo Gakugei University, Nukuikita-machi 4-1-1, Koganei-shi, Tokyo 184-8501, Japan; Laboratory of Integrative Brain Sciences, Department of Biology and Center for Medical Life Science, Waseda University, Wakamatsucho 2-2, Shinjuku-ku, Tokyo 162-8480, Japan
| | - Kazuyoshi Tsutsui
- Laboratory of Integrative Brain Sciences, Department of Biology and Center for Medical Life Science, Waseda University, Wakamatsucho 2-2, Shinjuku-ku, Tokyo 162-8480, Japan
| | - Yoshitaka Nagahama
- Institute for Collaborative Relations, Ehime University, Matsuyama, Ehime 790-8577, Japan
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Ikeda N, Uzawa H, Daiya M, Haraguchi S, Tsutsui K, Mita M. Relaxin-like gonad-stimulating peptide is highly conserved in starfishAsterina pectinifera. INVERTEBR REPROD DEV 2015. [DOI: 10.1080/07924259.2015.1091388] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Mita M, Ikeda N, Haraguchi S, Tsutsui K, Nakano Y, Nakamura M. A gonad-stimulating peptide of the crown-of-thorns starfish,Acanthaster planci. INVERTEBR REPROD DEV 2015. [DOI: 10.1080/07924259.2015.1086828] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Voss M, Gordon M, Mita M, Rini B, Makker V, Macarulla T, Smith D, Kwak E, Cervantes A, Puzanov I, Pili R, Wang D, Jalal S, Pant S, Patel M, Neuwirth R, Zohren F, Infante J. 354 Phase I study of investigational oral mTORC1/2 inhibitor MLN0128: Expansion phase in patients with renal, endometrial, or bladder cancer. Eur J Cancer 2015. [DOI: 10.1016/s0959-8049(16)30217-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Haraguchi S, Yamamoto Y, Suzuki Y, Hyung Chang J, Koyama T, Sato M, Mita M, Ueda H, Tsutsui K. 7α-Hydroxypregnenolone, a key neuronal modulator of locomotion, stimulates upstream migration by means of the dopaminergic system in salmon. Sci Rep 2015. [PMID: 26220247 PMCID: PMC4518220 DOI: 10.1038/srep12546] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Salmon migrate upstream against an opposing current in their natal river. However, the molecular mechanisms that stimulate upstream migratory behavior are poorly understood. Here, we show that 7α-hydroxypregnenolone (7α-OH PREG), a newly identified neuronal modulator of locomotion, acts as a key factor for upstream migration in salmon. We first identified 7α-OH PREG and cytochrome P450 7α-hydroxylase (P4507α), a steroidogenic enzyme producing 7α-OH PREG, in the salmon brain and then found that 7α-OH PREG synthesis in the brain increases during upstream migration. Subsequently, we demonstrated that 7α-OH PREG increases upstream migratory behavior of salmon. We further found that 7α-OH PREG acts on dopamine neurons in the magnocellular preoptic nucleus during upstream migration. Thus, 7α-OH PREG stimulates upstream migratory behavior through the dopaminergic system in salmon. These findings provide new insights into the molecular mechanisms of fish upstream migration.
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Affiliation(s)
- Shogo Haraguchi
- 1] Department of Biology and Center for Medical Life Science, Waseda University, Tokyo, Japan [2] Department of Biology, Tokyo Gakugei University, Tokyo, Japan
| | - Yuzo Yamamoto
- 1] Field Science Center for Northern Biosphere, Hokkaido University, Hokkaido, Japan [2] Current address: Demonstration Laboratory, Marine Ecology Research Institute, Niigata, Japan
| | - Yuko Suzuki
- Department of Biology and Center for Medical Life Science, Waseda University, Tokyo, Japan
| | - Joon Hyung Chang
- Department of Biology and Center for Medical Life Science, Waseda University, Tokyo, Japan
| | - Teppei Koyama
- Department of Biology and Center for Medical Life Science, Waseda University, Tokyo, Japan
| | - Miku Sato
- Department of Biology and Center for Medical Life Science, Waseda University, Tokyo, Japan
| | - Masatoshi Mita
- Department of Biology, Tokyo Gakugei University, Tokyo, Japan
| | - Hiroshi Ueda
- Field Science Center for Northern Biosphere, Hokkaido University, Hokkaido, Japan
| | - Kazuyoshi Tsutsui
- Department of Biology and Center for Medical Life Science, Waseda University, Tokyo, Japan
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Heist R, Infante J, Campana F, Egile C, Jego V, Damstrup L, Mita M, Grande E, Rizvi N. Pimasertib (Pim) and Sar245409 (Sar) - a Mek and Pi3K/Mtor Inhibitor Combination: a Phase Ib Trial with Expansions in Selected Genotype-Defined Solid Tumors. Ann Oncol 2014. [DOI: 10.1093/annonc/mdu331.3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Mita M, Haraguchi S, Watanabe M, Takeshige Y, Yamamoto K, Tsutsui K. Involvement of Gαs-proteins in the action of relaxin-like gonad-stimulating substance on starfish ovarian follicle cells. Gen Comp Endocrinol 2014; 205:80-7. [PMID: 24929230 DOI: 10.1016/j.ygcen.2014.06.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2013] [Revised: 05/29/2014] [Accepted: 06/02/2014] [Indexed: 11/22/2022]
Abstract
Gonad-stimulating substance (GSS) in starfish is the only known invertebrate peptide hormone responsible for final gamete maturation, rendering it functionally analogous to gonadotropins in vertebrates. In breeding season (stage V), GSS stimulates oocyte maturation to induce 1-methyladenine (1-MeAde) by ovarian follicle cells. The hormonal action of GSS is mediated through the activation of its receptor, G-proteins and adenylyl cyclase. It has been reported that GSS fails to induce 1-MeAde and cyclic AMP (cAMP) production in follicle cells of ovaries during oogenesis (stage IV). This study examined the regulatory mechanism how ovarian follicle cells acquire the potential to respond to GSS by producing 1-MeAde and cAMP. Because the failure of GSS action was due to G-proteins of follicle cells, the molecular structures of Gαs, Gαi, Gαq and Gβ were identified in follicle cells of starfish Asterina pectinifera. The cDNA sequences of Gαs, Gαi, Gαq and Gβ consisted of ORFs encoding 379, 354, 353 and 353 amino acids. The expression levels of Gαs were extremely low in follicle cells at stage IV, whereas the mRNA levels increased markedly in stage V. On contrary, the mRNA levels of Gαi were almost constant regardless of stage IV and V. These findings strongly suggest that de novo synthesis of Gαs-proteins is contributed to the action of GSS on follicle cells to produce 1-MeAde and cAMP.
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Affiliation(s)
- Masatoshi Mita
- Department of Biology, Faculty of Education, Tokyo Gakugei University, Nukuikita-machi 4-1-1, Koganei-shi, Tokyo 184-8501, Japan.
| | - Shogo Haraguchi
- Department of Biology, Faculty of Education, Tokyo Gakugei University, Nukuikita-machi 4-1-1, Koganei-shi, Tokyo 184-8501, Japan; Laboratory of Integrative Brain Sciences, Department of Biology and Center for Medical Life Science, Waseda University, Wakamatsucho 2-2, Shinjuku-ku, Tokyo 162-8480, Japan
| | - Miho Watanabe
- Department of Biology, Faculty of Education, Tokyo Gakugei University, Nukuikita-machi 4-1-1, Koganei-shi, Tokyo 184-8501, Japan
| | - Yuki Takeshige
- Department of Biology, Faculty of Education, Tokyo Gakugei University, Nukuikita-machi 4-1-1, Koganei-shi, Tokyo 184-8501, Japan
| | - Kazutoshi Yamamoto
- Laboratory of Integrative Brain Sciences, Department of Biology and Center for Medical Life Science, Waseda University, Wakamatsucho 2-2, Shinjuku-ku, Tokyo 162-8480, Japan
| | - Kazuyoshi Tsutsui
- Laboratory of Integrative Brain Sciences, Department of Biology and Center for Medical Life Science, Waseda University, Wakamatsucho 2-2, Shinjuku-ku, Tokyo 162-8480, Japan
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Mita M, Haraguchi S, Uzawa H, Tsutsui K. Contribution of de novo synthesis of Gαs-proteins to 1-methyladenine production in starfish ovarian follicle cells stimulated by relaxin-like gonad-stimulating substance. Biochem Biophys Res Commun 2013; 440:798-801. [DOI: 10.1016/j.bbrc.2013.10.038] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Accepted: 10/08/2013] [Indexed: 10/26/2022]
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Mita M, Gordon M, Rejeb N, Gianella-Borradori A, Jego V, Mita A, Sarantopoulos J, Sankhala K, Mendelson D. A phase l study of three different dosing schedules of the oral aurora kinase inhibitor MSC1992371A in patients with solid tumors. Target Oncol 2013; 9:215-24. [PMID: 23832397 DOI: 10.1007/s11523-013-0288-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2013] [Accepted: 06/21/2013] [Indexed: 11/24/2022]
Abstract
Aurora kinase inhibitors (AKIs) are a class of antimitotic, small-molecule anticancer agents. MSC1992371A is an AKI being evaluated for the treatment of patients with solid tumors. This phase I, open-label, dose-escalation study determined the maximum tolerated dose (MTD) of MSC1992371A in different dosing schedules in patients with locally advanced or metastatic solid tumors. MSC1992371A was administered on days 1 and 8 (schedule 1) or on days 1, 2, and 3 (schedule 2) of a 21-day cycle. The study was expanded with a third schedule (study drug on days 1-3 and 8-10). Adverse events were monitored throughout the study. Antitumor efficacy, drug pharmacokinetics, and pharmacodynamics were evaluated. Ninety-two patients were enrolled. MSC1992371A was dosed over eight levels in schedules 1 and 2, and the MTD was determined as 74 mg/m(2) per cycle for both schedules and as 60 mg/m(2) in schedule 3, albeit only in three patients due to discontinuation of the study. Overall, the most common grade 3 or 4 treatment-emergent adverse events were neutropenia, febrile neutropenia, thrombocytopenia, anemia, and fatigue. The most frequent dose-limiting toxicity over all schedules was neutropenia. MSC1992371A plasma concentrations tended to increase with increasing dose levels. Although no complete or partial responses were seen, stable disease ≥3 months was observed in 11 patients. Analysis for markers of target modulation and pharmacodynamics effects was unsuccessful. MSC1992371A was generally well tolerated in patients, with mainly transient hematologic toxicities apparent at an MTD of 60-74 mg/m(2)/21-day cycle, independent of dosing frequency.
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Affiliation(s)
- M Mita
- Cancer Therapy and Research Center, Institute for Drug Development, San Antonio, TX, USA,
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Mita M. Relaxin-like gonad-stimulating substance in an echinoderm, the starfish: a novel relaxin system in reproduction of invertebrates. Gen Comp Endocrinol 2013; 181:241-5. [PMID: 22841765 DOI: 10.1016/j.ygcen.2012.07.015] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/19/2012] [Revised: 07/10/2012] [Accepted: 07/13/2012] [Indexed: 11/15/2022]
Abstract
Gonad-stimulating substance (GSS) in starfish is the only known invertebrate peptide hormone responsible for final gamete maturation, rendering it functionally analogous to gonadotropins in vertebrates. Recently, GSS was purified from the radial nerves of the starfish Asterina pectinifera and its chemical structure determined. This review summarizes the chemical structure of relaxin-like peptide, GSS, from a starfish as the first identified gonadotropin in invertebrates and its hormonal action on reproduction. The starfish GSS is a relaxin-like heterodimeric peptide composed of two peptides (A- and B-chains) with disulfide cross-linkages. Chemically synthesized GSS induced oocyte maturation and ovulation in vitro and an unique spawning behavior followed by release of gametes in vivo. GSS is a first trigger for oocyte maturation in starfish, but its effect is indirect because GSS acts on the ovary to produce a second mediator, 1-methyladenine (1-MeAde), as a maturation-inducing hormone of starfish. The action of GSS on ovarian follicle cells to produce 1-MeAde is mediated through the activation of its receptor, G-protein, and adenylyl cyclase. In contrast to follicle cells in a fully grown state, GSS fails to induce 1-MeAde production in growing follicle cells because of a lack of Gs-proteins. Thus, relaxin-like GSS is a major factor in the neuroendocrine cascade controlling reproduction in starfish.
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Affiliation(s)
- Masatoshi Mita
- Department of Biology, Faculty of Education, Tokyo Gakugei University, Nukuikita-machi 4-1-1, Koganei-shi, Tokyo 184-8501, Japan.
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Mahalingam D, Wang Y, Lu T, Sarantopoulos J, Vemulapalli S, Aparo S, Coffey M, Gill G, Kennealey G, Mita M. 555 A Study of REOLYSIN in Combination with Gemcitabine in Patients with Advanced Pancreatic Adenocarcinoma. Eur J Cancer 2012. [DOI: 10.1016/s0959-8049(12)72352-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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