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Potdukhe S, Iyer J, More A. Effect of Artificial Aging on Translucency of Zirconia Reinforced Lithium Silicate and Lithium Disilicate Ceramics: A Systematic Review. Eur J Prosthodont Restor Dent 2024. [PMID: 38299373 DOI: 10.1922/ejprd_2602potdukhe09] [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] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Accepted: 11/23/2023] [Indexed: 02/02/2024]
Abstract
INTRODUCTION Digital dentistry and advanced ceramic materials have been widely used but which material has a better esthetically durable outcome needs to be evaluated. The purpose of this systematic review and meta-analysis was to evaluate the difference in the translucency of CAD zirconia-reinforced lithium silicate and CAD lithium disilicate glass ceramics after being subjected to artificial aging. MATERIAL AND METHODS Two independent reviewers searched the MEDLINE/ PubMed, Embase, and EBSCO databases and the Google Scholar search engine for in-vitro studies published from January 2010 to May 2023 to identify relevant studies measuring the translucency of CAD ZLS and CAD lithium disilicate glass ceramics after being subjected to different artificial aging conditions using the coffee solution, 4% acetic acid, distilled water and UV aging. RESULTS For qualitative synthesis, 10 studies were included. A statistically significant difference was observed between CAD zirconia-reinforced lithium silicate and CAD lithium disilicate glass ceramics (P⟨0.05, mean difference=-0.25 [-0.38,-0.11]). Translucency of CAD ZLS was less than CAD lithium disilicate glass ceramics. CONCLUSIONS Artificial aging has decreased the translucency of glass ceramics. For fixed prosthetic rehabilitation clinicians can opt for CAD lithium disilicate glass-ceramic as a more esthetically pleasing and durable material in oral environment.
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Affiliation(s)
- S Potdukhe
- MGM Dental College and Hospital, Kamothe, Navi Mumbai, India
| | - J Iyer
- MGM Dental College and Hospital, Kamothe, Navi Mumbai, India
| | - A More
- Dental Practitioner, Dental Clinic, Mumbai
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Wirtz AL, Iyer J, Brooks D, Hailey-Fair K, Galai N, Beyrer C, Celentano D. An evaluation of assumptions underlying respondent-driven sampling and the social contexts of sexual and gender minority youth participating in HIV clinical trials in the United States. medRxiv 2020. [PMID: 33173927 PMCID: PMC7654923 DOI: 10.1101/2020.11.02.20222489] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Introduction: Respondent-driven sampling has been an effective sampling strategy for HIV research in many settings, but has had limited success among some youth in the United States. We evaluated a modified RDS approach for sampling Black and Latinx sexual and gender minority youth (BLSGMY) and evaluates how lived experiences and social contexts of BLSGMY youth may impact traditional RDS assumptions. Methods: RDS was implemented in three cities to engage BLSGMY in HIV prevention or care intervention trials. RDS was modified to include targeted seed recruitment from venues, internet, and health clinics, and provided options for electronic or paper coupons. Qualitative interviews were conducted among a sub-sample of RDS participants to explore their experiences with RDS. Interviews were coded using RDS assumptions as an analytic framework. Results: Between August 2017 and October 2019, 405 participants were enrolled, 1,670 coupons were distributed, with 133 returned, yielding a 0.079 return rate. The maximum recruitment depth was 4 waves among seeds that propagated. Self-reported median network size was 5 (IQR 2–10) and reduced to 3 (IQR 1–5) when asked how many peers were seen in the past 30 days. Qualitative interviews (n=27) revealed that small social networks, peer trust, and targeted referral of peers with certain characteristics challenged network, random recruitment, and reciprocity assumptions of RDS. HIV stigma and research hesitancy were barriers to participation and peer referral. Conclusions: Small social networks and varying relationships with peers among BLSGMY challenge assumptions that underlie traditional RDS. Modified RDS approaches, including those that incorporate social media, may support recruitment for community-based research but may challenge assumptions of reciprocal relationships. Research hesitancy and situational barriers must be addressed in recruitment and study designs.
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Iyer J, Lim F, Yang Z, Tong L, Wong T. 5-year Incidence of Lubricant Dependence in Medically and Surgically Treated Glaucoma Patients. Acta Ophthalmol 2016. [DOI: 10.1111/j.1755-3768.2016.0494] [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: 11/30/2022]
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Bhatia S, Iyer J, Ibrani D, Blom A, Byrd D, Parvathaneni U, Diep T, Le M, Pierce R, Heller R, Daud A, Nghiem P. 504 Intratumoral delivery of Interleukin-12 DNA via in vivo electroporation leads to regression of injected and non-injected tumors in Merkel cell carcinoma: Final Results of a phase 2 study. Eur J Cancer 2015. [DOI: 10.1016/s0959-8049(16)30306-9] [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: 11/25/2022]
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Blom A, Marx T, Takagishi S, Lewis C, Iyer J, Nghiem P. Carcinome de Merkel : peut-on se passer de radiothérapie adjuvante pour certains patients ? Ann Dermatol Venereol 2014. [DOI: 10.1016/j.annder.2014.09.202] [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: 10/24/2022]
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Blom A, Paulson K, Moshiri A, Lisberg A, Lewis C, Bhatia S, Simonson W, Yelistratova L, Iyer J, Galloway D, Morishima C, Wener M, Nghiem P. Carcinome de Merkel : valeur pronostique et intérêt clinique de la sérologie contre MCPyV. Ann Dermatol Venereol 2014. [DOI: 10.1016/j.annder.2014.09.050] [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: 10/24/2022]
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Parvathaneni U, Iyer J, Miller N, Gooley T, Markowitz E, Bhatia S, Paulson K, Blom A, Liao J, Parvathaneni K, Lewis C, Doumani R, Nghiem P. A Novel Single-Fraction Radiation Therapy Approach for Metastatic Merkel Cell Carcinoma Is Well Tolerated and Demonstrates Strong Efficacy Linked to Intact Cellular Immunity. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.05.2199] [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: 10/24/2022]
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Parvathaneni U, Iyer J, Nagase K, Parvathaneni K, Nghiem P. Omitting Postoperative Radiation Therapy in Selected Cases of Merkel Cell Carcinoma -- When Is It Safe ? Int J Radiat Oncol Biol Phys 2012. [DOI: 10.1016/j.ijrobp.2012.07.1749] [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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Parvathaneni U, Iyer J, Nagase K, Parvathaneni K, Nghiem P. The Safety and Efficacy of Primary Radiation Therapy Without Upfront Surgery for Merkel Cell Carcinoma. Int J Radiat Oncol Biol Phys 2012. [DOI: 10.1016/j.ijrobp.2012.07.436] [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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Iyer J, Delpachitra S, Rane A. Successful reconstructive surgery to alter distorted vaginal axis causing apareunia. J OBSTET GYNAECOL 2012; 32:494-6. [PMID: 22663333 DOI: 10.3109/01443615.2012.677874] [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: 11/13/2022]
Affiliation(s)
- J Iyer
- Department of Urogynaecology, The Townsville and Mater Hospitals, James Cook University, Australia.
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Abstract
The sacrospinous ligament has been used for over 50 years as a convenient structure for treating vaginal vault and more recently, uterine prolapse. The procedure has evolved over the years and its efficacy has been hotly debated with invariable comparisons made to abdominal sacral colpopexy. Mesh surgery has introduced a newer dimension to the debate. This review is an attempt to clarify the anatomy, reflect on various techniques and offer a critique on the current 'status' of the sacrospinous ligament.
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Affiliation(s)
- A Rane
- Department of Urogynaecology, The Townsville Hospital, School of Medicine and Dentistry, James Cook University, Townsville, Australia
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Fan L, Iyer J, Zhu S, Frick KK, Wada RK, Eskenazi AE, Berg PE, Ikegaki N, Kennett RH, Frantz CN. Inhibition of N-myc expression and induction of apoptosis by iron chelation in human neuroblastoma cells. Cancer Res 2001; 61:1073-9. [PMID: 11221835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
Neuroblastoma is the second most common solid malignancy of childhood. Enhanced expression of the amplified N-myc gene in the tumor cells may be associated with poor patient prognosis and may contribute to tumor development and progression. The use of deferoxamine mesylate (DFO), an iron chelator, to treat neuroblastoma is being investigated in national clinical studies. We show here by TUNEL assay and DNA laddering that DFO induces apoptosis in cultured human neuroblastoma cells, which is preceded by a decrease in the expression of N-myc and the altered expression of some other oncogenes (up-regulating c-fos and down-regulating c-myb) but not housekeeping genes. The decrease in N-myc expression is iron-specific but does not result from inhibition of ribonucleotide reductase, because specific inhibition of this iron-containing enzyme by hydroxyurea does not affect N-myc protein levels. Nuclear run-on and transient reporter gene expression experiments show that the decrease in N-myc expression occurs at the level of initiation of transcription and by inhibiting N-myc promoter activity. Comparison across neuroblastoma cell lines of the amount of residual cellular N-myc protein with the extent of apoptosis measured as pan-caspase activity after 48 h of iron chelation reveals no correlation, suggesting that the decrease in N-myc expression is unlikely to mediate apoptosis. In conclusion, chelation of cellular iron by DFO may alter the expression of multiple genes affecting the malignant phenotype by multiple pathways. Given the clinical importance of N-myc overexpression in neuroblastoma malignancy, decreasing N-myc expression by DFO might be useful as an adjunct to current
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Affiliation(s)
- L Fan
- Department of Pediatrics and the Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore 21201, USA
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Iyer J, Bonnier D, Granger F, Iltis C, Andry V, Schultz P, Gronemeyer H. Versatile copurification procedure for rapid isolation of homogeneous RAR-RXR heterodimers. Protein Expr Purif 1999; 16:308-14. [PMID: 10419826 DOI: 10.1006/prep.1999.1053] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
RAR-RXR heterodimeric complexes (RARalphaDeltaAB-RXRalphaDeltaAB) bound to cognate DR5 DNA response elements were purified to apparent structural and functional homogeneity using a novel versatile immobilized metal affinity chromatography (IMAC) copurification procedure. Dynamic light scattering studies indicated that the complexes were more than 85% monodisperse. By electron microscopy the negatively stained RAR-RXR-DNA complexes appeared homogeneous and corresponded to a dimeric arrangement of the molecules. Using heterodimers purified according to this procedure we demonstrate ligand binding of RXR in the context of the RAR-RXR heterodimer-DNA complex. The present copurification procedure is rapid and has yielded high quality heterodimer-DNA complexes suitable for both structural and biochemical studies.
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Affiliation(s)
- J Iyer
- Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC)/CNRS/INSERM/ULP, C.U. de Strasbourg, Illkirch Cedex, 67404, France
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Chen ZP, Iyer J, Bourguet W, Held P, Mioskowski C, Lebeau L, Noy N, Chambon P, Gronemeyer H. Ligand- and DNA-induced dissociation of RXR tetramers. J Mol Biol 1998; 275:55-65. [PMID: 9451439 DOI: 10.1006/jmbi.1997.1413] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Unliganded bacterially expressed RXR alpha lacking the N-terminal region AB (apo-RXR alpha delta AB) was found in solution as an apparent mixture of 165 kDa tetramers and 42 kDa monomers which could be quantitatively separated by gel filtration and non-denaturing gel electrophoresis. Under identical conditions both liganded (holo-) and apo-RAR alpha delta AB were present as single monomeric species. apo-RXR alpha delta AB tetramers, as well as dimers of the apo-RXR ligand binding domain (apo-LBD), dissociated readily into monomers when exposed to their cognate ligand 9-cis retinoic acid (9c-RA). The apo-RXR alpha delta AB tetramer bound only transiently to a cognate DR1 response element, and was converted into DR1-apo-RXR alpha delta AB homodimer complexes indistinguishable from those generated by cooperative DNA binding of apo-RXR alpha delta AB monomers. In the absence of DNA, the addition of 9c-RA greatly accelerated the formation of heterodimers with the apo-RAR alpha delta AB heterodimerization partner. No RXR alpha delta AB or RAR alpha delta AB homodimers could be observed in solution, but upon mixing of the two receptor monomers stable heterodimers could be isolated which bound to DR5 response elements in a highly cooperative manner. In these heterodimers, RXR alpha delta AB interacted with its cognate ligand as efficiently as in RXR alpha delta AB homodimers. The presence of ligand did not alter the stability of RXR alpha delta AB homodimer or RXR alpha delta AB-RAR alpha delta AB heterodimer complexes on DR1 and DR5 response elements, respectively. These in vitro data support a model in which RXR tetramers could serve as an inactive pool with the dual function of: (i) rapidly supplying large amounts of RXR heterodimerization partners upon 9c-RA generation; and (ii) allowing RXR homodimer formation on "accessible" cognate response elements in the absence of 9c-RA. These events may represent a ligand-dependent regulatory mechanism controlling the availability of the promiscuous RXR dimerization partner that is engaged in multiple nuclear receptor signalling pathways.
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Affiliation(s)
- Z P Chen
- Institut de Génétique et de Biology Moléculaire et Cellulaire (IGBMC), CNRS/INSERM/ULP/Collége de France, Strasbourg
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Iyer J, Duerst RE, Looney JN, Humphries RK, Abboud CN, Frantz CN. An 80,000-kd glycoprotein cell surface antigen found only on nonhematopoietic cells in human bone marrow. Exp Hematol 1990; 18:384-9. [PMID: 1692535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The murine IgG2a monoclonal antibody (MoAb) 6-19 binds to the surface of human nonhematopoietic cells but not to hematopoietic cells. As previously described, it can be used with complement to selectively kill nonhematopoietic cells prior to culture of human bone marrow. It is now shown that the 6-19 MoAb recognizes a specific antigenic determinant of apparent molecular mass 80 kd, detected by western blotting on nonhematopoietic tumor cell lines, endothelial cells, and bone marrow stromal cells. Mouse L cells were transfected with human DNA, and the 6-19 monoclonal antibody selected cells that expressed an antigen with similar characteristics. The antigenic determinant is absent in hematopoietic tumor cell lines, peripheral blood cells, and bone marrow hematopoietic cells. Investigation of the biochemical nature of the antigen, using various enzymes, lectin-binding studies, and western blotting suggests that the 6-19 epitope is at least partially carbohydrate and that the protein has N-linked sugars but not O-linked. The affinity (Ka approximately 10(9) M-1) of MoAb 6-19 binding is similar in tumor cells and normal fibroblasts and endothelial cells. The identification of a specific antigenic determinant of 80 kd may help to discriminate between hematopoietic and nonhematopoietic cells in human bone marrow.
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Affiliation(s)
- J Iyer
- University of Rochester Medical Center, NY 14642
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Schaefer R, Iyer J, Iten E, Nirkko AC. Partial reversion of the transformed phenotype in HRAS-transfected tumorigenic cells by transfer of a human gene. Proc Natl Acad Sci U S A 1988; 85:1590-4. [PMID: 3125552 PMCID: PMC279819 DOI: 10.1073/pnas.85.5.1590] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
The transformed phenotype of rat FE-8 cells transfected by an activated human HRAS gene was suppressed upon fusion with normal cells. An experimental approach was developed to identify and isolate a human gene capable of suppressing the transforming activity of the HRAS oncogene in FE-8 cells. Genomic DNA from human placenta was introduced into FE-8 cells by cotransfection with the plasmid pY3 conferring hygromycin B resistance. Transfectants were selected in medium containing hygromycin B. HRAS-transformed FE-8 cells showed an increased sensitivity toward ouabain when compared to their normal counterparts. Therefore, the population of transfected hygromycin B-resistant cells was treated with ouabain to eliminate cells with a transformed phenotype. Ouabain selection resulted in a small number of cell clones exhibiting a more normal phenotype. The clones had lost the morphology of transformed cells and required anchorage for growth. The tumorigenicity of transfectants in nude mice was reduced but not completely abolished. FE-8 revertants continued to express the p21 RAS protein. Human repetitive sequences contained in the DNA of a secondary transfectant were used for isolation of the suppressor gene from reverted FE-8 cells. The cloned DNA fragment was transfected into tumorigenic FE-8 cells and conferred a partial reversion of the transformed phenotype.
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Affiliation(s)
- R Schaefer
- Ludwig Institute for Cancer Research, Inselspital, Bern, Switzerland
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Burden N, Iyer J. Local anesthesia: not always benign. J Post Anesth Nurs 1987; 2:45-50. [PMID: 3643998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Schönmann SM, Iyer J, Laeng H, Gerber HA, Käser H, Blaser K. Production and characterization of monoclonal antibodies against human neuroblastoma. Int J Cancer 1986; 37:255-62. [PMID: 3943922 DOI: 10.1002/ijc.2910370214] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
MAb were derived from mice immunized with cells of the human neuroblastoma line IMR-32. Five hybridomas were selected according to their selective binding to human cell lines, tumors and normal tissues. One of them, CE7, reacted with all sympatho-adrenomedullary cells (neuroblastoma, ganglioneuroblastoma, ganglioneuroma, pheochromocytoma, adrenal medulla, sympathetic ganglion cells). Weak cross-reactivities were observed with melanocytes and with some human melanoma and glioma cell lines. The antigen recognized by CE7 was markedly expressed on neuroblastoma tumors of all histological grades, independently of the adrenergic or cholinergic nature of these cells. MAb derived from clones AD2, BC1, BC4 and CB10 bound variably to some, but not to all, neuroblastoma cells. By using these MAb, 3 phenotypes of neuroblastoma lines could be distinguished. The binding profiles of these types, however, showed no correlation with origin of the cell lines or stage of the disease.
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