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1.
J Ophthalmol ; 2023: 7701390, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-37180814

RESUMO

Background: To analyze the tolerance on distance vision of different combined residual astigmatic situations in patients implanted with a novel wavefront shaping extended depth of focus (EDoF) intraocular lens (IOL). Methods: The study included patients implanted with the Acrysof® IQ Vivity® IOL. Uncorrected (UDVA) and corrected distance visual acuity (CDVA) were measured three months after surgery, considering CDVA as the reference situation of the study. Distance VA was also measured in different refractive situations: (A) with 0.50 diopters (D) of positive (myopization) and negative (hyperopization) defocus and (B) with a residual mixed astigmatic refraction induced by adding a combination of -0.25 D spherical and 0.50 D cylindrical lenses placed in vertical (against the rule-ATR), oblique, and horizontal (with the rule-WTR) positions. Results: The study included 30 eyes of 30 patients. UDVA and CDVA were -0.04 ± 0.05 and -0.05 ± 0.05 logMAR, respectively. VA values with +0.50 D and -0.50 D of defocus were 0.01 ± 0.06 and 0.00 ± 0.04 logMAR, respectively. VA was better with distance correction (p < 0.001) and no differences were found between the myopic and the hyperopic situations (p=0.09). Distance VA for the ATR, oblique, and WTR astigmatic situations was 0.01 ± 0.05, 0.01 ± 0.06, and 0.01 ± 0.04 logMAR, respectively. VA was better for the reference situation (p < 0.001) and no differences were found among the three astigmatic situations (p=0.21). Conclusions: Low residual defocus and mixed astigmatic errors, regardless of its orientation, seem to be tolerated by patients implanted with the studied EDoF IOL. This trial is registered with NCT05392998. Registered 26 May 2022-Retrospectively registered.

2.
Eur J Ophthalmol ; 32(6): 3425-3432, 2022 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-35254149

RESUMO

PURPOSE: To evaluate the visual and refractive outcomes of monofocal toric intraocular lens (IOL) implantation after cataract surgery in amblyopic eyes. METHODS: Our center's database was used to identify patients who had undergone bilateral cataract surgery between 2016 and 2020 with the implantation of a toric IOL in their amblyopic eye. Exclusion criteria were the presence of strabismus, ocular pathologies other than cataract or intra-surgical complications. The outcomes analysed were uncorrected distance visual acuity (UDVA), subjective refraction and corrected distance visual acuity (CDVA) one month after surgery. RESULTS: Ninety patients were included, with a mean age of 68.96 ± 7.81years. CDVA was lower for the amblyopic eye, both before and after surgery. There was a mean improvement in CDVA of 0.23 ± 0.21 LogMAR for the dominant eye and of 0.39 ± 0.33 for the amblyopic eye, p < 0.001 in both cases. Postoperative subjective refractive cylinder was higher in the amblyopic eye (-0.24 ± 0.39 D versus -0.10 ± 0.25 D, p < 0.01), as well as mean cylinder prediction error (-0.30 ± 0.47 D versus 0.02 ± 0.42 D, p < 0.01), compared to the dominant eye. There was a statistically significant correlation between preoperative and postoperative CDVA in amblyopic eyes (Spearmans Rho = 260, p = 0.013). Mean postoperative UCVA was 0.15 ± 0.25 for amblyopic and 0.03 ± 0.12 for dominant eyes. Only one patient required distance spectacle correction due to residual astigmatism. CONCLUSIONS: Cataract surgery with toric IOL implantation in amblyopic eyes leads to an improvement in visual acuity and to spectacle independence in almost all cases, even in the presence of a higher cylinder prediction error.


Assuntos
Ambliopia , Astigmatismo , Catarata , Lentes Intraoculares , Facoemulsificação , Idoso , Ambliopia/complicações , Ambliopia/cirurgia , Astigmatismo/cirurgia , Catarata/complicações , Humanos , Implante de Lente Intraocular , Pessoa de Meia-Idade , Estudos Prospectivos , Refração Ocular
3.
Elife ; 102021 09 21.
Artigo em Inglês | MEDLINE | ID: mdl-34545812

RESUMO

Gene knockout of the master regulator of mitochondrial fission, Drp1, prevents neoplastic transformation. Also, mitochondrial fission and its opposing process of mitochondrial fusion are emerging as crucial regulators of stemness. Intriguingly, stem/progenitor cells maintaining repressed mitochondrial fission are primed for self-renewal and proliferation. Using our newly derived carcinogen transformed human cell model, we demonstrate that fine-tuned Drp1 repression primes a slow cycling 'stem/progenitor-like state', which is characterized by small networks of fused mitochondria and a gene-expression profile with elevated functional stem/progenitor markers (Krt15, Sox2 etc) and their regulators (Cyclin E). Fine tuning Drp1 protein by reducing its activating phosphorylation sustains the neoplastic stem/progenitor cell markers. Whereas, fine-tuned reduction of Drp1 protein maintains the characteristic mitochondrial shape and gene-expression of the primed 'stem/progenitor-like state' to accelerate neoplastic transformation, and more complete reduction of Drp1 protein prevents it. Therefore, our data highlights a 'goldilocks' level of Drp1 repression supporting stem/progenitor state dependent neoplastic transformation.


Assuntos
Transformação Celular Neoplásica/metabolismo , Dinaminas/metabolismo , Dinâmica Mitocondrial , Células-Tronco/metabolismo , Animais , Proliferação de Células , Transformação Celular Neoplásica/genética , Ciclina E/genética , Ciclina E/metabolismo , Dinaminas/genética , Células HaCaT , Humanos , Queratina-15/genética , Queratina-15/metabolismo , Queratinócitos/citologia , Queratinócitos/metabolismo , Fosforilação , Fatores de Transcrição SOXB1/genética , Fatores de Transcrição SOXB1/metabolismo
4.
J Ophthalmol ; 2020: 2421816, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32377414

RESUMO

METHODS: Our center's database was used to identify all isolated cataract procedures performed during 2017. The electronic records were reviewed to collect the preoperative information, presence of intra- or postsurgical complications, and visual and refractive outcomes one month after surgery. RESULTS: In 2017, 2714 eyes of 1543 patients underwent cataract surgery in our center. Mean patient age was 70.42 years. 775 eyes (28.55%) had prior ophthalmic pathologies, and 113 eyes (4.16%) had undergone previous surgical procedures. Surgical complications developed in 35 eyes (1.29%), including 9 posterior capsule tears (0.33%) and 3 cases of dropped lens fragments (0.11%). A toric or multifocal intraocular lens was implanted in 45.6% of eyes. As regards postoperative complications, 59 eyes (2.17%) required a return to the operating theater, including 29 eyes (1.07%) requiring reinterventions due to an unexpected refractive result. There were no cases of endophthalmitis. Mean LogMAR-corrected distance visual acuity (CDVA) improved from 0.25 (SD 0.34) preoperatively to 0.04 (SD 0.17) postoperatively; 86.5% of eyes achieved a CDVA ≤0.0, with 97.5% achieving ≤0.3. In 86.4% of eyes, the difference between target and residual spherical equivalent difference was of 0.50 D or lower; 88% of eyes had a spherical equivalent ±0.50 D. CONCLUSIONS: The visual and refractive outcomes of cataract surgery in a private practice setting were excellent, well over the benchmarks set by the ESCRS. The safety profile was also within expected standards. This study provides information for ophthalmologists in private practice on expected outcomes.

5.
J Cell Sci ; 128(22): 4171-82, 2015 Nov 15.
Artigo em Inglês | MEDLINE | ID: mdl-26446260

RESUMO

The regulation and function of the crucial cell cycle regulator cyclin E (CycE) remains elusive. Unlike other cyclins, CycE can be uniquely controlled by mitochondrial energetics, the exact mechanism being unclear. Using mammalian cells (in vitro) and Drosophila (in vivo) model systems in parallel, we show that CycE can be directly regulated by mitochondria through its recruitment to the organelle. Active mitochondrial bioenergetics maintains a distinct mitochondrial pool of CycE (mtCycE) lacking a key phosphorylation required for its degradation. Loss of the mitochondrial fission protein dynamin-related protein 1 (Drp1, SwissProt O00429 in humans) augments mitochondrial respiration and elevates the mtCycE pool allowing CycE deregulation, cell cycle alterations and enrichment of stem cell markers. Such CycE deregulation after Drp1 loss attenuates cell proliferation in low-cell-density environments. However, in high-cell-density environments, elevated MEK-ERK signaling in the absence of Drp1 releases mtCycE to support escape of contact inhibition and maintain aberrant cell proliferation. Such Drp1-driven regulation of CycE recruitment to mitochondria might be a mechanism to modulate CycE degradation during normal developmental processes as well as in tumorigenic events.


Assuntos
Ciclina E/metabolismo , GTP Fosfo-Hidrolases/metabolismo , Proteínas Associadas aos Microtúbulos/metabolismo , Mitocôndrias/metabolismo , Proteínas Mitocondriais/metabolismo , Animais , Ciclo Celular/fisiologia , Proliferação de Células/fisiologia , Ciclina E/genética , Drosophila melanogaster , Dinaminas , Feminino , GTP Fosfo-Hidrolases/genética , Humanos , Proteínas Associadas aos Microtúbulos/genética , Proteínas Mitocondriais/genética , Fosforilação , Transdução de Sinais , Transfecção
6.
Invest. clín ; 45(1): 53-62, mar. 2004. ilus, tab, graf
Artigo em Espanhol | LILACS | ID: lil-396444

RESUMO

Con la finalidad de investigar la síntesis de Proteína C Reactiva (PCR) en niños con diferentes grados de desnutrición y entre desnutridos graves infectados y eutróficos infectados; así como en un grupo control de niños eutróficos, se determinó las concentraciones de esta proteína por el método turbidimétrico en 109 niños venezolanos en edades comprendidas entre 6 meses y 6 años. Los resultados encontrados mostraron que el desnutrido grave infectado aumenta su valor de PCR de manera significativa (80,80 ± 38,39 mg/L) en relación con el no infectado (8,17 ± 3,06 mg/L) (p < 0,001). Igualmente hubo diferencias estadísticamente significativas entre los desnutridos graves infectados y el grupo de eutróficos infectados (p < 0,001) quienes presentaron valores más elevados. En relación con los grupos de desnutridos no infectados se encontró diferencia significativa entre los desnutridos graves con el resto de los grupos y el grupo control eutrófico (p < 0,05), no obstante, sus concentraciones permanecieron dentro del valor normal. Estos resultados permiten concluir que el desnutrido infectado es capaz de sintetizar PCR en respuesta a procesos infecciosos graves pero que difiere significativamente cuando sus valores se comparan con los del eutrófico infectado. Por otra parte el desnutrido libre de infección cualquiera que sea su grado de desnutrición mantiene sus valores de PCR en límites normales


Assuntos
Humanos , Masculino , Feminino , Criança , Desnutrição Proteico-Calórica , Infecções/metabolismo , Mediadores da Inflamação/síntese química , Proteína C-Reativa/síntese química , Medicina , Venezuela
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