RESUMO
As a consequence of irregular and rapid changes in the external environment, plants are constantly exposed to a diverse range of stresses, including desiccation, high salinity, extreme temperatures, and metal toxicity. To contend with these stresses, plants have evolved an elaborate array of defense mechanisms and defense-related molecules, including a range of regulatory proteins. Stress-associated proteins (SAPs), a novel subclass of zinc-finger proteins, have been established to play key roles in plant stress responses. These SAPs, which tend to be structurally conserved among different plant species and are typically characterized by a combination of the A20, AN1, and C2H2 domains, have attracted considerable interest in recent decades on account of their involvement in diverse abiotic stress responses. In this review, we aim to provide a brief overview of the discovery and identification of SAPs in plants, with a particular focus on their roles in response to different abiotic stresses. In this regard, phenotypic analyses using transgenic plants have highlighted the dual regulatory role of SAPs in modulating stress responses, wherein by inducing physiological and morphological alterations at the cellular level, they can contribute to both positive and negative effects. However, despite significant advances in the characterization of these proteins, their precise functions remain incompletely understood. This review consolidates our current knowledge regarding SAPs and delineates potential avenues for future research, which we anticipate will unravel the intricate functional dynamics of SAPs in plant stress responses.
Assuntos
Proteínas de Plantas , Estresse Fisiológico , Proteínas de Plantas/metabolismo , Proteínas de Plantas/genética , Plantas/metabolismo , Plantas/genética , Regulação da Expressão Gênica de PlantasRESUMO
Posttranslational modification of multiple ABA signaling components is an essential process for the adaptation and survival of plants under stress conditions. In our previous study, we established that the pepper group A PP2C protein CaAITP1, one of the core components of ABA signaling, undergoes ubiquitination mediated by the RING-type E3 ligase CaAIRE1. In this study, we discovered an additional form of regulation mediated via the SUMOylation of CaAITP1. Pepper plants subjected to drought stress were characterized by reductions in both the stability and SUMOylation of CaAITP1 protein. Moreover, we identified a SUMO protease, Capsicum annuum DeSUMOylating Isopeptidase 2 (CaDeSI2), as a new interacting partner of CaAITP1. In vitro and in vivo analyses revealed that CaAITP1 is deSUMOylated by CaDeSI2. Silencing of CaDeSI2 in pepper plants led to drought-hypersensitive and ABA-hyposensitive phenotypes, whereas overexpression of CaDeSI2 in transgenic Arabidopsis plants resulted in the opposite phenotypes. Importantly, we found that the CaAITP1 protein was stabilized in response to the silencing of CaDeSI2, and CaDeSI2 and CaAITP1 co-silenced pepper plants were characterized by drought-tolerant phenotypes similar to those observed in CaAITP1-silenced pepper. Collectively, our findings indicate that CaDeSI2 reduces the stability of CaAITP1 via deSUMOylation, thereby positively regulating drought tolerance.
Assuntos
Ácido Abscísico , Capsicum , Secas , Regulação da Expressão Gênica de Plantas , Proteínas de Plantas , Estresse Fisiológico , Capsicum/genética , Capsicum/fisiologia , Capsicum/enzimologia , Proteínas de Plantas/metabolismo , Proteínas de Plantas/genética , Ácido Abscísico/metabolismo , Estresse Fisiológico/genética , Sumoilação , Plantas Geneticamente Modificadas , Arabidopsis/genética , Arabidopsis/fisiologia , Inativação Gênica , Fosfoproteínas Fosfatases/metabolismo , Fosfoproteínas Fosfatases/genética , Ligação Proteica , Estabilidade Proteica , FenótipoRESUMO
The advent of coronavirus disease 2019 (COVID-19) pandemic has affected the incidence and course of various diseases and numerous studies have investigated ocular involvement associated with COVID-19 and corresponding vaccines. In this study, we compared the incidence of multiple evanescent white dot syndrome (MEWDS) before and during the COVID-19 pandemic at a single center in Korea and analyzed the demographic and clinical features of patients with MEWDS presenting during the COVID-19 pandemic. We categorized patients with MEWDS into two groups according to date of diagnosis. Pre-COVID19 group included patients diagnosed during the pre-pandemic period (between March 11, 2017, and March 10, 2020), whereas post-COVID19 group included patients diagnosed during the pandemic period (between March 11, 2020, and March 10, 2023). 6 and 12 patients were included in pre-COVID19 group and post-COVID19 group, respectively. Among all hospital visits during the pre-pandemic and pandemic periods, 0.011% and 0.030% were due to MEWDS, indicating a significant increase during the pandemic (p = 0.029, B = 2.756). The annual incidence of patients with MEWDS in 2017-2022 were 0.73, 0.75, 0.78, 1.32, 2.49, and 2.07 per 10,000 population, respectively, corresponding to a significant increase (p = 0.039, B = 1.316). Our results imply that the incidence and manifestation of MEWDS are likely to become more diverse in the COVID-19 pandemic era.
Assuntos
COVID-19 , Humanos , COVID-19/epidemiologia , COVID-19/complicações , Masculino , Feminino , Incidência , República da Coreia/epidemiologia , Pessoa de Meia-Idade , Adulto , SARS-CoV-2/isolamento & purificação , Síndrome dos Pontos Brancos/epidemiologia , Idoso , PandemiasRESUMO
Under stress conditions, plants modulate their internal states and initiate various defence mechanisms to survive. The ubiquitin-proteasome system is one of the critical modules in these mechanisms, and Plant U-Box proteins play an important role in this process as E3 ubiquitin ligases. Here, we isolated the Plant U-box 24 gene CaPUB24 (Capsicum annuum Plant U-Box 24) from pepper and characterized its functions in response to drought stress. We found that, compared to the other CaPUBs in the same group, the expression of CaPUB24 was significantly induced by drought stress. We also found that CaPUB24 was localized to the nucleus and cytoplasm and had E3 ubiquitin ligase activity. To investigate the biological role of CaPUB24 in response to drought stress further, we generated CaPUB24-silenced pepper plants and CaPUB24-overexpressing Arabidopsis transgenic plants. CaPUB24-silenced pepper plants exhibited enhanced drought tolerance compared to the control plants due to reduced transpirational water loss and increased abscisic acid (ABA) sensitivity. In contrast, CaPUB24-overexpressing Arabidopsis transgenic plants exhibited reduced drought tolerance and ABA-insensitive phenotypes. Our findings suggest that CaPUB24 negatively modulates drought stress response in an ABA-dependent manner.
Assuntos
Arabidopsis , Ubiquitina-Proteína Ligases , Ubiquitina-Proteína Ligases/genética , Ubiquitina-Proteína Ligases/metabolismo , Secas , Arabidopsis/metabolismo , Ácido Abscísico/farmacologia , Ácido Abscísico/metabolismo , Plantas Geneticamente Modificadas/metabolismo , Proteínas de Plantas/genética , Proteínas de Plantas/metabolismo , Ubiquitinas/genética , Ubiquitinas/metabolismo , Estresse Fisiológico/genética , Regulação da Expressão Gênica de PlantasRESUMO
PURPOSE: To investigate cases of vitreous opacity (VO) similar to asteroid hyalosis (AH) after intravitreal brolucizumab injection. METHODS: A retrospective chart review was conducted to identify cases showing VO similar to AH among patients who received intravitreal brolucizumab injections at our retinal clinic from January 2022 to January 2023. RESULTS: A total of 220 brolucizumab injections were administered at our hospital. VO, showing yellow-white brilliant reflective particles, was found in six patients (2.7%). When VO occurred, all patients complained of floaters, although none of them complained of other symptoms including decreased visual acuity, pain, or conjunctival redness. The mean number of brolucizumab injections was 2.57 ± 2.38. No significant visual impairment was observed while VO was present. VO improved in all cases, and four cases improved without any treatment. The mean interval from onset to disappearance of VO was 8.0 ± 3.1 weeks. CONCLUSIONS: VO, similar to AH, can occur with a relatively high probability after intravitreal brolucizumab injections. Patients complained of severe floaters, but VO was not accompanied by other symptoms including vision impairment, injection, and pain. The VO disappeared after approximately 4 to 14 weeks. In case that other inflammatory findings are not severe, close follow-up without treatment may be sufficient. If a patient complains of floaters after an intravitreal brolucizumab injection, close fundus observation is necessary to evaluate the VO.
Assuntos
Anticorpos Monoclonais Humanizados , Doenças Orbitárias , Transtornos da Visão , Humanos , Estudos Retrospectivos , Injeções Intravítreas , Dor , Inibidores da AngiogêneseRESUMO
Current-induced spin torques enable the electrical control of the magnetization with low energy consumption. Conventional magnetic random access memory (MRAM) devices rely on spin-transfer torque (STT), this however limits MRAM applications because of the nanoseconds incubation delay and associated endurance issues. A potential alternative to STT is spin-orbit torque (SOT). However, for practical, high-speed SOT devices, it must satisfy three conditions simultaneously, i.e., field-free switching at short current pulses, short incubation delay, and low switching current. Here, we demonstrate field-free SOT switching at sub-ns timescales in a CoFeB/Ti/CoFeB ferromagnetic trilayer, which satisfies all three conditions. In this trilayer, the bottom magnetic layer or its interface generates spin currents with polarizations in both in-plane and out-of-plane components. The in-plane component reduces the incubation time, while the out-of-plane component realizes field-free switching at a low current. Our results offer a field-free SOT solution for energy-efficient scalable MRAM applications.
RESUMO
Two Gram-stain-negative, obligately aerobic, motile rod bacteria, designated as G2-5T and G20-9T, exhibiting catalase- and oxidase-positive activities, were isolated from the phycosphere of a Chondrus species, a marine red alga. Strain G2-5T exhibited optimal growth at 30â°C and pH 5.0-6.0 and in the presence of 0.5-1.0% NaCl. In contrast, strain G20-9T demonstrated optimal growth at 25â°C and pH 6.0 and in the presence of 0.5-1.5% NaCl. Both strains contained ubiquinone-10, summed feature 8 (C18â:â1 ω7c and/or C18â:â1 ω6c), C18â:â0 and 11-methyl-C18â:â1 ω7c, and diphosphatidylglycerol and phosphatidylglycerol as the major respiratory isoprenoid quinone, cellular fatty acids and polar lipids, respectively. The genomic DNA G+C contents were 57.2âmol% for strain G2-5T and 57.5âmol% for strain G20-9T. Strains G2-5T and G20-9T exhibited 98.2â% 16S rRNA gene sequence similarity, along with 82.3â% average nucleotide identity (ANI) and 25.0â% digital DNA-DNA hybridization (dDDH) values, indicating that they represent different species. Phylogenetic analyses based on both 16S rRNA gene and genome sequences revealed that strains G2-5T and G20-9T formed distinct phylogenic lineages within the genus Devosia. Strains G2-5T and G20-9T were most closely related to Devosia limi DSM 17137T and Devosia beringensis S02T with 97.7 and 96.9â% 16S rRNA gene sequence similarities, respectively. The ANI and dDDH values between strains G2-5T and G20-9T and other Devosia species were lower than 73.9 and 19.2â%, respectively, suggesting that they constitute novel species within the genus Devosia. Based on their distinct phenotypic, chemotaxonomic, and molecular characteristics, strains G2-5T and G20-9T represent two novel species of the genus Devosia, for which the names Devosia rhodophyticola sp. nov. (G2-5T=KACC 22601T=JCM 35404T) and Devosia algicola sp. nov. (G20-9T=KACC 22650T=JCM 35405T) are proposed, respectively.
Assuntos
Gammaproteobacteria , Rodófitas , Composição de Bases , Ácidos Graxos/química , Filogenia , RNA Ribossômico 16S/genética , Cloreto de Sódio , Análise de Sequência de DNA , DNA Bacteriano/genética , Técnicas de Tipagem Bacteriana , NucleotídeosRESUMO
BACKGROUND: To identify the macular neovascularization (MNV) features in exudative age-related macular degeneration (AMD) patients who exhibited residual fluid after receiving three loading doses of aflibercept. METHODS: Patients were classified into two groups: Group 1, which did not exhibit intraretinal fluid (IRF) and subretinal fluid (SRF), and Group 2, which did exhibit IRF and/or SRF. Optical coherence tomography angiography (OCTA) features were assessed and compared between the groups. RESULTS: A total of 101 eyes were enrolled; 65 for Group 1 and 36 for Group 2. No significant differences were found in baseline MNV size (2.94 ± 2.51 µm2 vs. 2.22 ± 2.26 µm2, P = 0.178) or vessel density (47.1 ± 15.4 % vs. 41.3 ± 10.5%, P = 0.052) between Groups 1 and 2. There were significant differences in the presence of loops (52.3% vs. 75%, P = 0.026) and peripheral arcades (29.2% vs. 55.6%, P < 0.001) at baseline between the two groups. In Group 1, there was a significant reduction in the presence of branching (P < 0.001) and loops (P = 0.016) after treatment. In Group 2, only the presence of branching decreased significantly (P < 0.001) after treatment. Multivariable analysis revealed that the presence of a peripheral arcade (B = 4.77, P = 0.001) was significantly associated with residual fluid. CONCLUSIONS: Although responding to treatment, the presence of loops and peripheral arcades in exudative AMD patients may contribute to residual fluid following the three loading doses of aflibercept. The peripheral arcade, in particular, may play a more significant role in the presence of residual fluid.
RESUMO
The effects of EGCG on the selective death of cancer cells by modulating antioxidant pathways through autophagy were explored in various normal and cancer cells. EGCG positively regulated the p62-KEAP1-NRF2-HO-1 pathway in normal cells, while negatively regulating it in cancer cells, leading to selective apoptotic death of cancer cells. In EGCG-treated MRC5 cells (EGCG-MRC5), autophagic flux was blocked, which was accompanied by the formation of p62-positive aggregates. However, EGCG-treated HeLa cells (EGCG-HeLa) showed incomplete autophagic flux and no aggregate formation. The levels of P-ULK1 S556 and S758 increased in EGCG-MRC5 through AMPK-mTOR cooperative interaction. In contrast, EGCG treatment in HeLa cells led to AMPK-induced mTOR inactivation, resulting in abrogation of P-ULK1 S556 and S758 levels. AMPK knockout in EGCG-HeLa restored positive regulation of the p62-mediated pathway, which was accompanied by increased P-mTOR S2448 and P-ULK1 S758 levels. Knockdown of 67LR in EGCG-HeLa abolished AMPK activity but did not restore the p62-mediated pathway. Surprisingly, both AMPK knockout and 67LR knockdown in EGCG-HeLa markedly increased cell viability, despite differential regulation of the antioxidant enzyme HO-1. In conclusion, EGCG induces the selective death of cancer cells through the modulation of at least two autophagy-dependent and independent regulatory pathways: negative regulation involves the mTOR-ULK1 (S556 and S758)-p62-KEAP1-NRF2-HO-1 axis via AMPK activation, whereas positive regulation occurs through the 67LR-AMPK axis.
Assuntos
Antioxidantes , Neoplasias , Humanos , Antioxidantes/farmacologia , Proteína 1 Associada a ECH Semelhante a Kelch , Proteínas Quinases Ativadas por AMP/genética , Células HeLa , Fator 2 Relacionado a NF-E2/genética , Autofagia , Serina-Treonina Quinases TOR/genética , Neoplasias/tratamento farmacológico , Neoplasias/genéticaRESUMO
Controlling protein stability or degradation via the ubiquitin-26S proteasome system is a crucial mechanism in plant cellular responses to stress conditions. Previous studies have revealed that the pepper FANTASTIC FOUR-like gene, CaFAF1, plays a positive role in salt tolerance and that, in this process, CaFAF1 protein degradation is delayed. Here, we sought to isolate the E3 ligases potentially responsible for modulating CaFAF1 protein stability in response to salt stress. The pepper RING-type E3 ligase CaFIRF1 (Capsicum annuum FAF1 Interacting RING Finger protein 1) was found to interact with and ubiquitinate CaFAF1, leading to the degradation of CaFAF1 proteins. In response to high-salt treatments, CaFIRF1-silenced pepper plants exhibited tolerant phenotypes. In contrast, co-silencing of CaFAF1 and CaFIRF1 led to increased sensitivity to high-salt treatments, revealing that CaFIRF1 functions upstream of CaFAF1. A cell-free degradation analysis showed that high-salt treatment suppressed CaFAF1 protein degradation via the 26S proteasome pathway, in which CaFIRF1 is functionally involved. In addition, an in vivo ubiquitination assay revealed that CaFIRF1-mediated ubiquitination of CaFAF1 proteins was reduced by high-salt treatment. Taken together, these findings suggest that the degradation of CaFAF1 mediated by CaFIRF1 has a critical role in pepper plant responses to high salinity.
Assuntos
Ácido Abscísico , Ubiquitina-Proteína Ligases , Ubiquitina-Proteína Ligases/genética , Ubiquitina-Proteína Ligases/metabolismo , Ácido Abscísico/metabolismo , Estresse Fisiológico/genética , Proteínas de Plantas/genética , Proteínas de Plantas/metabolismo , Estresse Salino , Plantas Geneticamente Modificadas/metabolismo , Regulação da Expressão Gênica de PlantasRESUMO
Under severe environmental stress conditions, plants inhibit their growth and development and initiate various defense mechanisms to survive. The pseudo-response regulator (PRRs) genes have been known to be involved in fruit ripening and plant immunity in various plant species, but their role in responses to environmental stresses, especially high salinity and dehydration, remains unclear. Here, we focused on PRRs in tomato plants and identified two PRR2-like genes, SlSRP1 and SlSRP1H, from the leaves of salt-treated tomato plants. After exposure to dehydration and high-salt stresses, expression of SISRP1, but not SlSRP1H, was significantly induced in tomato leaves. Subcellular localization analysis showed that SlSRP1 was predominantly located in the nucleus, while SlSRP1H was equally distributed in the nucleus and cytoplasm. To further investigate the potential role of SlSRP1 in the osmotic stress response, we generated SISRP1-silenced tomato plants. Compared to control plants, SISRP1-silenced tomato plants exhibited enhanced tolerance to high salinity, as evidenced by a high accumulation of proline and reduced chlorosis, ion leakage, and lipid peroxidation. Moreover, SISRP1-silenced tomato plants showed dehydration-tolerant phenotypes with enhanced abscisic acid sensitivity and increased expression of stress-related genes, including SlRD29, SlAREB, and SlDREB2. Overall, our findings suggest that SlSRP1 negatively regulates the osmotic stress response.
Assuntos
Desidratação , Solanum lycopersicum , Solanum lycopersicum/genética , Proteínas de Plantas/metabolismo , Cloreto de Sódio/farmacologia , Cloreto de Sódio/metabolismo , Ácido Abscísico/metabolismo , Estresse Fisiológico , Plantas Geneticamente Modificadas/metabolismo , Regulação da Expressão Gênica de PlantasRESUMO
Two Gram-stain-negative, catalase- and oxidase-positive, aerobic non-motile and motile rod bacteria, strains MSW6T and RSW2T, were isolated from surface seawater. Strain MSW6T optimally grew at 20â°C, pH 7.0 and 3â% NaCl, while strain RSW2T optimally grew at 25â°C, pH 7.0-8.0 and 2â% NaCl. Strain MSW6T possessed menaquinone-6 as the major respiratory quinone, and its major fatty acids were iso-C15â:â1 G, iso-C15â:â0 and iso-C15â:â0 3-OH. The major polar lipid identified in strain MSW6T was phosphatidylethanolamine (PE). On the other hand, strain RSW2T had ubiquinone-8 as the predominant respiratory quinone, and its major fatty acids consisted of summed feature 3 (C16â:â1 ω7c and/or C16â:â1 ω6c), summed feature 8 (C18â:â1 ω7c and/or C18â:â1 ω6c) and C16â:â0. The major polar lipids identified in strain RSW2T were PE and phosphatidylglycerol. As the sole respiratory quinone, strain MSW6T possessed menaquinone-6, while strain RSW2T had ubiquinone-8. The DNA G+C contents of strains MSW6T and RSW2T were 31.9 and 43.4âmol%, respectively. Phylogenetic analyses based on 16S rRNA and core gene sequences showed that strain MSW6T formed a phylogenic lineage with Psychroserpens mesophilus KOPRI 13649T, while strain RSW2T formed a phylogenic lineage with Marinomonas primoryensis KMM 3633T. Strain MSW6T shared 97.9â% 16S rRNA gene sequence similarity and 80.7â% average nucleotide identity (ANI) ith P. mesophilus KOPRI 13649T, and strain RSW2T shared 99.1â% 16S rRNA gene sequence similarity and 93.1â% ANI with M. primoryensis KMM 3633T. Based on the results of phenotypic, chemotaxonomic and phylogenetic analyses, strains MSW6T and RSW2T represent novel species of the genera Psychroserpens and Marinomonas, respectively, for which the names Psychroserpens ponticola sp. nov. and Marinomonas maritima sp. nov. are proposed, respectively. The type strain of P. ponticola is MSW6T (=KACC 22338T=JCM 35022T) and the type strain of M. maritima is RSW2T (=KACC 22716T=JCM 35550T).
Assuntos
Ácidos Graxos , Marinomonas , Ácidos Graxos/química , Ubiquinona/química , Filogenia , RNA Ribossômico 16S/genética , Vitamina K 2/química , Cloreto de Sódio , DNA Bacteriano/genética , Hibridização de Ácido Nucleico , Composição de Bases , Técnicas de Tipagem Bacteriana , Análise de Sequência de DNA , Água do Mar/microbiologia , Fosfolipídeos/químicaRESUMO
Plants have developed various defense mechanisms against environmental stresses by regulating hormone signaling. Jasmonic acid (JA) is a major phytohormone associated with plant defense responses. JASMONATE ZIM-DOMAIN (JAZ) proteins play a regulatory role in repressing JA signaling, impacting plant responses to both biotic and abiotic stresses. Here, we isolated 7 JAZ genes in pepper and selected CA03g31030, a Capsicum annuum JAZ1-03 (CaJAZ1-03) gene, for further study based on its expression level in response to abiotic stresses. Through virus-induced gene silencing (VIGS) in pepper and overexpression in transgenic Arabidopsis plants, we established the functional role of CaJAZ1-03. Functional studies revealed that CaJAZ1-03 dampens abscisic acid (ABA) signaling and drought stress responses. The cell-free degradation assay showed faster degradation of CaJAZ1-03 in drought- or ABA-treated pepper leaves compared to healthy leaves. Conversely, CaJAZ1-03 was completely preserved under MG132 treatment, indicating that CaJAZ1-03 stability is modulated via the ubiquitin-26s proteasome pathway. We also found that the pepper RING-type E3 ligase CaASRF1 interacts with and ubiquitinates CaJAZ1-03. Additional cell-free degradation assays revealed a negative correlation between CaJAZ1-03 and CaASRF1 expression levels. Collectively, these findings suggest that CaJAZ1-03 negatively regulates ABA signaling and drought responses and that its protein stability is modulated by CaASRF1.
RESUMO
Abscisic acid (ABA) signalling triggers drought resistance mediated by SNF1-related kinase 2s (SnRK2s), which transmits stress signals through the phosphorylation of several downstream factors. However, these kinases and their downstream targets remain elusive in pepper plants. This study aimed to isolate interacting partners of CaSnRK2.6, a homologue of Arabidopsis SnRK2.6/OST1. Among the candidate proteins, we identified a homeodomain-leucine zipper (HD-Zip) class II protein and named it CaHAT1 (Capsicum annuum homeobox ABA signalling related- transcription factor 1). CaHAT1-silenced pepper and -overexpression (OE) transgenic Arabidopsis plants were generated to investigate the in vivo function of CaHAT1 in drought response. Following the application of drought stress, CaHAT1-silenced pepper plants exhibited drought-sensitive phenotypes with reduced ABA-mediated stomatal closure and lower expression of stress-responsive genes compared with control plants. In contrast, CaHAT1-OE transgenic Arabidopsis plants showed the opposite phenotypes, including increased drought resistance and ABA sensitivity. CaHAT1, particularly its N-terminal consensus sequences, was directly phosphorylated by CaSnRK2.6. Furthermore, CaSnRK2.6 kinase activity and CaSnRK2.6-mediated CaHAT1 phosphorylation levels were enhanced by treatment with ABA and drought stress. Taken together, our results indicated that CaHAT1, which is the target protein of CaSnRK2.6, is a positive regulator of drought stress response. This study advances our understanding of CaHAT1-CaSnRK2.6 mediated defence mechanisms in pepper plants against drought stress.
Assuntos
Ácido Abscísico , Arabidopsis , Ácido Abscísico/metabolismo , Arabidopsis/metabolismo , Secas , Genes Homeobox , Proteínas de Plantas/genética , Proteínas de Plantas/metabolismo , Transdução de Sinais , Plantas Geneticamente Modificadas/metabolismo , Fatores de Transcrição/genética , Fatores de Transcrição/metabolismo , Estresse Fisiológico , Regulação da Expressão Gênica de PlantasRESUMO
PURPOSE: To identify the characteristics of the retinal microvasculature in epiretinal membrane patients with ectopic inner foveal layer (EIFL). METHODS: Patients were classified into two groups: those without EIFL (Group 1) and those with EIFL (Group 2). The vessel density (VD), perfusion density (PD), and the foveal avascular zone (FAZ) parameters were compared using optical coherence tomography angiography. Linear regression analysis was performed to identify the optical coherence tomography angiography parameters associated with best-corrected visual acuity. RESULTS: The VD of the central area in Group 1 and Group 2 was 11.6 ± 3.3 and 17.2 ± 2.8 mm -1 , respectively ( P < 0.001), the PD of the central area was 21.7 ± 6.2 and 32.0 ± 5.5%, respectively ( P < 0.001), and the FAZ area was 0.24 ± 0.11 and 0.09 ± 0.08 mm 2 , respectively ( P < 0.001). Based on the linear regression analysis, the VD of the central area (B = 0.018, P = 0.003), the PD of the central area (B = 0.009, P = 0.004), and FAZ area (B = -0.489, P = 0.013) were significantly associated with best-corrected visual acuity in patients with epiretinal membrane. CONCLUSION: The VD and PD of the foveal area were significantly higher in patients with EIFL, and the FAZ area was lower in patients with EIFL than in those without EIFL. In addition, the VD and PD of the foveal area were negatively associated with best-corrected visual acuity, and the FAZ area was positively associated with best-corrected visual acuity in patients with epiretinal membrane.
Assuntos
Membrana Epirretiniana , Humanos , Membrana Epirretiniana/diagnóstico , Vasos Retinianos , Estudos Retrospectivos , Acuidade Visual , Fóvea Central/irrigação sanguínea , Microvasos , Tomografia de Coerência Óptica/métodos , Angiofluoresceinografia/métodosRESUMO
PURPOSE: This study aimed to examine the 7-year follow-up results of cytoreductive surgery (CRS) and intraperitoneal chemotherapy (IPC) for peritoneal metastasis (PM) of colorectal cancer. METHODS: We performed 54 cases of CRS and IPC in 53 patients with PM of colorectal cancer from December 2011 to December 2013. We prospectively collected data and analyzed peritoneal carcinomatosis grade, completeness of cytoreduction, and long-term follow-up (median, 10 [range, 2-92] months) results. RESULTS: The mean peritoneal cancer index was 15 (1 ~ 35), and complete cytoreduction was possible in 35 (64.8%) patients. Excluding the four patients who died, 11 (22.4%) out of the 49 patients were alive at the time of the last follow-up, and the overall median survival period was 10.3 months. The overall 2- and 5-year survival rates were 31% and 17%, respectively. Patients with complete cytoreduction had a median survival period of 22.6 months, which was significantly longer than that for patients without complete cytoreduction (3.5 months) (P < 0.001). The 5-year survival rate for patients with complete cytoreduction was 24%, and four patients were still alive without disease. CONCLUSIONS: CRS and IPC show a 5-year survival rate of 17% in patients with PM of colorectal cancer. A possibility of long-term survival is observed in a selected group. Multidisciplinary team evaluation for careful patient selection and CRS training program to achieve complete cytoreduction are significantly important factors in improving survival rate.
Assuntos
Neoplasias Colorretais , Hipertermia Induzida , Neoplasias Peritoneais , Humanos , Neoplasias Peritoneais/tratamento farmacológico , Neoplasias Peritoneais/cirurgia , Seguimentos , Procedimentos Cirúrgicos de Citorredução/métodos , Neoplasias Colorretais/tratamento farmacológico , Neoplasias Colorretais/cirurgia , Neoplasias Colorretais/patologia , Prognóstico , Terapia Combinada , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , República da Coreia/epidemiologia , Hipertermia Induzida/métodos , Taxa de SobrevidaRESUMO
Midgut malrotation (MM) is a rare anatomical abnormality that complicates the diagnosis and management of acute abdominal pain. Moreover, appendicitis and diverticulitis of the sigmoid colon can be considered when there is pain in the lower left abdomen. The patient in this case report was an 86-year-old female who had continuous abdominal pain two days before the visit to the emergency room. Abdominopelvic computed tomography revealed MM, and uneven concentric wall thickening from the distal descending colon to the proximal sigmoid colon with surrounding fatty infiltration was confirmed in the left lower abdomen. Moreover, the possibility of left-sided appendicitis due to MM could not be excluded. The patient's abdominal pain increased next day. The surgery was performed laparoscopically, and the location of the appendix was reversed. The surgical findings revealed an abscess caused by perforation from inflammation of the proximal part of the appendix, and the sigmoid colon adhered mildly to the side immediately behind the abscess cavity. The base of the appendix was intact, and only an appendectomy was performed. Left-sided appendicitis due to MM was discriminated from the diverticulitis of the sigmoid colon. Diagnostic laparoscopic surgery through a physical examination based on the surgeon's experience is important.
Assuntos
Apendicite , Diverticulite , Feminino , Humanos , Idoso de 80 Anos ou mais , Apendicite/diagnóstico , Colo Sigmoide , Abscesso , Diverticulite/complicações , Dor Abdominal/etiologiaRESUMO
PURPOSE: Peripheral exudative hemorrhagic chorioretinopathy (PEHCR) is a rare degenerative disease that affects the peripheral retina. Reports of PEHCR in Asian patients are rare. Thus, the aim of this study was to investigate the clinical characteristics and outcomes of PEHCR in Asian patients. METHODS: A retrospective chart review of 33 eyes of 29 Asian patients with PEHCR. RESULTS: The mean age of the patients was 70 years, and 75.9% of them were women. Vitreous hemorrhage occurred in 51.5% of eyes during a mean follow-up of 43.1 months. The occurrence of vitreous hemorrhage was associated with a thicker baseline subfoveal choroid ( P = 0.001) and the male sex ( P = 0.005). Final visual acuity was less than 20/200 in 29.2% of eyes. The predictive factors for a final visual acuity worse than 20/200 included poor initial visual acuity ( P = 0.002), initial lesion involvement of more than 180° of the peripheral retina ( P = 0.03), an extension of subretinal hemorrhage to the macula ( P = 0.040), and absence of complete tumor regression ( P = 0.02). CONCLUSION: Asian PEHCR patients seem to be more frequently associated with vitreous hemorrhages, especially in male patients with thicker choroids. Although PEHCR was largely self-limiting, approximately one-third of the eyes ended up with a visual acuity of less than 20/200 with extensive lesion involvement.
Assuntos
Doenças da Coroide , Doenças Retinianas , Idoso , Idoso de 80 Anos ou mais , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Asiático , Coriorretinite , Doenças da Coroide/epidemiologia , Retina , Doenças Retinianas/epidemiologia , Hemorragia Retiniana , Estudos Retrospectivos , Hemorragia Vítrea/complicações , Resultado do TratamentoRESUMO
To investigate the impact of the combination of type 2 diabetes (DM) and high myopia on inner retinal layer thickness of the macular area. The patients were divided into four groups: control (group 1), patients with DM without high myopia (group 2), patients with high myopia without DM (group 3), and patients with DM and high myopia (group 4). Ganglion cell complex (GCC) thickness was compared among the groups. Linear regression analysis was performed to identify factors associated with GCC thickness. A total of 194 eyes were enrolled: 59 in group 1, 52 in group 2, 49 in group 3, and 34 in group 4. The average parafovea GCC thicknesses were 113.9 ± 10.4, 112.4 ± 11.2, 112.2 ± 7.8, and 102.6 ± 15.1 µm (P < 0.001), and the average perifovea GCC thicknesses were 104.8 ± 13.2, 103.5 ± 10.8, 103.6 ± 8.8, and 93.9 ± 15.5 µm in groups 1, 2, 3 and 4, respectively (P = 0.001). In multivariate analyses, age (ß = - 0.20, P = 0.007), DM duration (ß = - 0.34, P = 0.023), and axial length (ß = - 1.64, P < 0.001) were significantly associated with parafoveal GCC thickness. The GCC was significantly thinner when high myopia and DM were combined, compared to either condition alone. Additionally, age, DM duration, and axial length were significant factors associated with GCC thickness. The combination of mechanical stretching and neurodegeneration would accelerate neural damage to the retina, resulting in greater inner retinal layer thinning.