Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 338
Filtrar
1.
Exp Cell Res ; 442(2): 114220, 2024 Aug 28.
Artigo em Inglês | MEDLINE | ID: mdl-39214330

RESUMO

Primary open-angle glaucoma (POAG), a leading cause of irreversible vision loss, is closely linked to increased intraocular pressure (IOP), with the trabecular meshwork (TM) playing a critical role in its regulation. The TM, located at the iridocorneal angle, acts as a sieve, filtering the aqueous humor from the eye into the collecting ducts, thus maintaining proper IOP levels. The transforming growth factor-beta 2 (TGF-ß2) signaling pathway has been implicated in the pathophysiology of primary open-angle glaucoma POAG particularly, in the dysfunction of the TM. This study utilizes human TM explants to closely mimic in vivo conditions, thereby minimizing transcriptional changes that could arise from cell culture enabling an exploration of the transcriptomic impacts of TGF-ß2. Through bulk RNA sequencing and immunohistological analysis, we identified distinct gene expression patterns and morphological changes induced by TGF-ß2 exposure (5 ng/ml for 48 h). Bulk RNA sequencing identified significant upregulation in genes linked to extracellular matrix (ECM) regulation and fibrotic signaling. Immunohistological analysis further elucidated the morphological alterations, including cytoskeletal rearrangements and ECM deposition, providing a visual confirmation of the transcriptomic data. Notably, the enrichment analysis unveils TGF-ß2's influence on both bone morphogenic protein (BMP) and Wnt signaling pathways, suggesting a complex interplay of molecular mechanisms contributing to TM dysfunction in glaucoma. This characterization of the transcriptomic modifications on an explant model of TM obtained under the effect of this profibrotic cytokine involved in glaucoma is crucial in order to develop and test new molecules that can block their signaling pathways.

2.
Skin Res Technol ; 24(4): 551-556, 2018 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-29479745

RESUMO

BACKGROUND: A woman's skin is dramatically affected by pregnancy. Its biomechanical properties are critical for resisting highly stressed areas. The aim of this work was to evaluate the impact of pregnancy on the mechanical properties of skin, as well as to evaluate the imprint that pregnancy leaves on the skin after delivery. MATERIALS AND METHODS: Suction tests using a cutometer were performed on 15 non-pregnant women and 26 pregnant women at 8 months of pregnancy and 4 months after delivery. Areas of abdomen and thighs were studied. RESULTS: Significant differences between the non-pregnant and 8-month pregnant groups were observed. Our data demonstrate that skin becomes less elastic and less deformable on the abdomen during pregnancy. On the thighs, a loss of elasticity and firmness was also observed. At 4 months after delivery, the skin did not return to its initial state. CONCLUSION: This study showed that the mechanical properties of skin changed drastically during pregnancy compared to the non-pregnant condition and that these properties remain altered 4 months after delivery. In addition to alterations in abdominal skin during pregnancy, we also observed mechanical changes on the thighs, which are less subject to stretching.


Assuntos
Gravidez/fisiologia , Fenômenos Fisiológicos da Pele , Abdome/fisiologia , Adulto , Fenômenos Biomecânicos , Feminino , Humanos , Coxa da Perna/fisiologia , Adulto Jovem
3.
Osteoarthritis Cartilage ; 22(4): 547-56, 2014 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-24530278

RESUMO

OBJECTIVE: We previously identified an association between bone sialoprotein (BSP) and osteoarthritic (OA) chondrocyte hypertrophy but the precise role of BSP in ostearthritis (OA) has not been extensively studied. This study aimed to confirm the association between BSP and OA chondrocyte hypertrophy, to define its effect on molecules produced by chondrocytes and to analyse its association with cartilage degradation and vascular density at the osteochondral junction. METHOD: Human OA chondrocytes were cultivated in order to increase hypertrophic differentiation. The effect of parathyroid hormone-related peptide (PTHrP), interleukin (IL)-1ß or tumour necrosis factor (TNF)-α on BSP was analysed by real-time reverse transcription polymerase chain reaction (RT-PCR) and western blot. The effects of BSP on OA chondrocytes production of inflammatory response mediators (IL-6, nitric oxide), major matrix molecule (aggrecan), matrix metalloprotease-3 and angiogenic factors (vascular endothelial growth factor, basic fibroblast growth factor, IL-8, and thrombospondin-1) were investigated. BSP was detected by immunohistochemistry and was associated with cartilage lesions severity and vascular density. RESULTS: PTHrP significantly decreased BSP, confirming its association with chondrocyte hypertrophy. In presence of IL-1ß, BSP stimulated IL-8 synthesis, a pro-angiogenic cytokine but decreased the production of TSP-1, an angiogenesis inhibitor. The presence of BSP-immunoreactive chondrocytes in cartilage was associated with the severity of histological cartilage lesions and with vascular density at the osteochondral junction. CONCLUSION: This study supports the implication of BSP in the pathology of OA and suggests that it could be a key mediator of the hypertrophic chondrocytes-induced angiogenesis. To control chondrocyte hypertrophic differentiation is promising in the treatment of OA.


Assuntos
Condrócitos/patologia , Sialoproteína de Ligação à Integrina/metabolismo , Osteoartrite do Joelho/patologia , Agrecanas/metabolismo , Western Blotting , Condrócitos/metabolismo , Fator 2 de Crescimento de Fibroblastos/metabolismo , Humanos , Técnicas In Vitro , Interleucina-1beta/farmacologia , Interleucina-6/metabolismo , Interleucina-8/metabolismo , Metaloproteinase 3 da Matriz/metabolismo , Óxido Nítrico/metabolismo , Osteoartrite do Joelho/metabolismo , Proteína Relacionada ao Hormônio Paratireóideo/farmacologia , Reação em Cadeia da Polimerase em Tempo Real , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Trombospondina 1/metabolismo , Fator de Necrose Tumoral alfa/farmacologia , Fatores de Crescimento do Endotélio Vascular/metabolismo
4.
Br J Dermatol ; 171(5): 978-86, 2014 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-24506732

RESUMO

BACKGROUND: There is growing evidence for the ongoing structural and functional adaptation of the skin after birth. OBJECTIVES: The aim of this study was the definition of scanning electron microscopy markers of skin maturation in different age groups (birth to adulthood). We propose a semiquantitative score to analyse the maturation of the skin surface and a complementary evaluation of the distribution of corneodesmosin and corneodesmosomes. MATERIAL AND METHODS: An electron microscopy isotropy (E.M.I.) score was performed in six age-groups to include fullterm neonates, babies, children and adults. The distribution of corneodesmosome remnants was analysed by corneodesmosin distribution with immunocytochemical corneocyte labelling. RESULTS: The E.M.I. score showed the highest anisotropy in neonates. The youngest groups displayed irregular and thick cell clusters composed of poorly individualized cells. In the older groups, the distribution of superficial corneocytes was more regular. The cells evenly covered the surface and displayed easily visualized single cell outlines. The distribution of immune-labelled corneodesmosome remnants and the corneocyte projected area showed a correlation between age and structural maturation. The observed evolution indicated a poorly controlled process of corneocyte desquamation in infants and confirmed the relative immaturity of the epidermal barrier up to 1-2 years after birth under basal conditions. CONCLUSION: Our study is the first attempt at semiquantitative evaluation of the micromorphology maturation of the epidermal surface at the ultrastructural level. The E.M.I. score and the associated pattern of corneodesmosome breakdown may be used as markers of the stratum corneum maturation.


Assuntos
Epiderme/crescimento & desenvolvimento , Adulto , Envelhecimento/fisiologia , Biomarcadores/metabolismo , Pré-Escolar , Desmossomos/ultraestrutura , Células Epidérmicas , Epiderme/ultraestrutura , Humanos , Imuno-Histoquímica , Lactente , Recém-Nascido , Microscopia Eletrônica de Varredura , Adulto Jovem
5.
J Fr Ophtalmol ; 47(4): 104107, 2024 Apr.
Artigo em Francês | MEDLINE | ID: mdl-38430627

RESUMO

Hyperbaric oxygen therapy consists of breathing 100% oxygen continuously or intermittently in a chamber at a pressure equal to or greater than 1.4 absolute atmospheres. Indicated for the emergency treatment of carbon monoxide poisoning and other medical-surgical pathologies such as gas embolism or necrotizing soft-tissue infections, various studies have shown a beneficial effect of hyperbaric oxygen therapy in certain ocular pathologies, notably of microcirculatory origin, such as central retinal artery occlusion or macular edema linked to retinal vein occlusions. In addition, hyperbaric oxygen might represent an alternative treatment for ocular quinine toxicity and might also be useful as an adjuvant to surgery and antibiotics in cases of periorbital necrotizing fasciitis. On the other hand, oxygen in high concentrations has toxic ocular effects due to the production of reactive oxygen derivatives.


Assuntos
Oftalmopatias , Fasciite Necrosante , Oxigenoterapia Hiperbárica , Humanos , Microcirculação , Oftalmopatias/terapia , Oxigênio , Fasciite Necrosante/terapia
6.
J Fr Ophtalmol ; 47(2): 104042, 2024 Feb.
Artigo em Francês | MEDLINE | ID: mdl-38306728

RESUMO

The relationship between glaucoma and Obstructive Sleep Apnea Syndrome (OSAS) has long been discussed, with conflicting study findings. OSAS appears in the most recent studies to be more of an aggravating factor than an independent risk factor for glaucoma. Patients with OSAS may develop a more rapid progression of primary open-angle glaucoma (POAG). OSAS may damage the optic nerve not only by increasing the intraocular pressure (IOP) but also by altering the blood supply to the optic nerve as shown by more recent work with OCT-Angiography. Although the systemic benefits of Continuous Positive Airway Pressure (CPAP) have been demonstrated, few studies have evaluated its effect on the optic nerve. CPAP might act on glaucomatous neuropathy by improving the blood supply to the optic nerve. The study of this mechanism of action might provide new insights into the relationship between OSAS and glaucoma.


Assuntos
Glaucoma de Ângulo Aberto , Glaucoma , Apneia Obstrutiva do Sono , Humanos , Glaucoma de Ângulo Aberto/complicações , Glaucoma de Ângulo Aberto/diagnóstico , Glaucoma de Ângulo Aberto/epidemiologia , Glaucoma/etiologia , Pressão Intraocular , Nervo Óptico , Apneia Obstrutiva do Sono/complicações , Apneia Obstrutiva do Sono/diagnóstico , Apneia Obstrutiva do Sono/epidemiologia
7.
J Fr Ophtalmol ; 47(9): 104098, 2024 Aug 28.
Artigo em Francês | MEDLINE | ID: mdl-39208602

RESUMO

The surgical treatment of glaucoma has been and is still based on filtering surgeries, commonly used for about half a century. The safety and efficacy of these techniques have been well described, as it has also been done for cyclophotocoagulation and valves or tubes, indicated in France mostly for refractory glaucoma. Minimally invasive glaucoma surgeries have emerged in recent decades, increasing the number of therapeutic options, and allowing treatment decisions to be as patient-centered as possible. Most of these techniques have now been studied for more than five years. Since glaucoma is a chronic, progressive optic neuropathy, the sustainability of each surgery's results is essential. The amount of available data concerning long-term efficacy and safety of glaucoma surgeries is increasing, so we have decided to describe it through this review of the literature.

8.
J Fr Ophtalmol ; 47(9): 104290, 2024 Sep 11.
Artigo em Francês | MEDLINE | ID: mdl-39265285

RESUMO

PURPOSE: This study examines the impact of dry eye on screen reading, with an emphasis on glare and visual comfort for patients. POPULATION AND METHODS: We recruited ten patients with dry eye and nine healthy controls. Clinical signs of dry eye were quantified to determine the quality of the tear film and corneal aberrations. Questionnaires related to quality of life and light sensitivity were administered. All participants underwent a screen reading test under five different levels of brightness. RESULTS: Patients with dry eye presented with more significant ocular inflammation (Oxford score) and reduced tear breakup time (BUT; DED: 4.1s, CO: 11.8s; W=90, P<0.001) compared to the control population. Patients also exhibited impaired quality of life (OSDI score: CO: 15.044±9.16, DED: 38.150±18.66, P=0.004) and increased light sensitivity (Glare test: CO: 96.56±65.5 arc.min, DED: 204.1±82.5 arc.min, W=15, P=0.013; VLSQ score: CO: 16.44±4.85, DED: 22.0±6.34, P=0.049). Reading tests did not show a significant difference between the groups (CO: 155±23.3 words/min and DED: 149±28.0, F=1.935, P=0.169). Brightness did not influence reading speed (F=1.308, P-value=0.275). A correlation was observed between reading speed and the OSDI quality of life questionnaire (R=-0.7, P=0.043). CONCLUSION: Although screen brightness did not have a significant impact on reading speed, glare proved to be a major issue for patients with dry eye. The associations between clinical manifestations of dry eye and reading performance emphasize the importance of comprehensive management of this condition. The results suggest that dry eye can influence both quality of life and screen reading, highlighting the need for dedicated approaches to improve the visual comfort of patients.

9.
J Fr Ophtalmol ; 48(1): 104300, 2024 Oct 04.
Artigo em Francês | MEDLINE | ID: mdl-39368260

RESUMO

PAX6-related congenital aniridia is a genetic pan-ocular disease characterized by a partial or total absence of the iris and foveal hypoplasia. The mechanisms involved in the development of ocular hypertension and glaucoma in patients with congenital aniridia are still unknown. Many hypotheses have been proposed and the advent of new anterior segment imaging techniques has allowed the identification of various potential mechanisms: congenital trabecular dysfunction, progressive closure of the iridocorneal angle, postoperative ocular hypertension. The diagnosis must take into account the various obstacles to clinical examination (corneal opacity, obturating cataract, foveolar aplasia, significant nystagmus) and is often considered only upon detection of ocular hypertension. Glaucoma remains, along with limbal insufficiency, one of the major causes of blindness in congenital aniridia. The treatment of glaucoma in congenital aniridia is primarily medical. The benefit/risk ratio of a surgical intervention should always be thoroughly evaluated in order to not underestimate the postoperative complications associated with congenital aniridia.

10.
J Fr Ophtalmol ; 47(8): 104260, 2024 Jul 26.
Artigo em Inglês | MEDLINE | ID: mdl-39067375

RESUMO

PURPOSE: The goal of this study was to assess the efficacy and safety of inferior implantation of the Xen Gel 45® Stent in a cohort of refractory glaucoma patients who had undergone multiple failed procedures and lacked healthy superior conjunctiva. PATIENTS AND METHODS: We retrospectively included individuals with refractory glaucoma who underwent implantation of a Xen 45® in the inferior quadrants of the conjunctiva. At the 12-month mark, two success criteria were assessed: "Complete" success, defined as an intraocular pressure (IOP)≤21mmHg with a≥20% reduction in IOP without additional IOP-lowering medications, the absence of a requirement for additional filtering surgery, and the absence of chronic hypotony; and "Qualified" success, which consisted of patients meeting the same criteria but requiring glaucoma medications postoperatively. Safety was also monitored throughout the 12-month follow-up. RESULTS: A total of 35 patients who underwent inferior Xen implantation were assessed. After 12months, 20 patients (57.1%) achieved qualified success, with twelve patients (34.3%) attaining complete success. Excluding five patients who underwent additional filtering surgery during follow-up, the mean IOP decreased significantly from 30.73±9.7mmHg to 16.49±7.9mmHg, representing a mean decrease of 14.24±12.13mmHg (46.5%; P<0.0001). The mean number of medications at 12months decreased from 3.43±1.6 to 1.53±1.52 (-55.4%; P<0.0001). The mean number of needlings was 1.29±1.2. Implant exposure was observed in two patients during the first postoperative month. CONCLUSIONS: Inferior placement of Xen appears to be a viable treatment option for patients with refractory glaucoma and a history of multiple failed glaucoma procedures. It demonstrates both significant efficacy and acceptable safety.

11.
Osteoarthritis Cartilage ; 21(12): 1913-23, 2013 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-23973427

RESUMO

OBJECTIVE: The aim of this study was to investigate the link between the hypertrophic phenotype of chondrocytes and angiogenesis in osteoarthritis (OA) and more particularly to demonstrate that OA hypertrophic chondrocytes potentially express a phenotype promoting angiogenesis through the expression of factors controlling endothelial cells migration, invasion and adhesion. METHOD: Human OA chondrocytes were cultivated in alginate beads in medium supplemented with 10% fetal bovine serum (FBS) to induce chondrocyte hypertrophy. The hypertrophic phenotype was characterized throughout 28 days of culture by measuring the expression of specific genes and by a microscopic observation of cellular morphology. The effect of media conditioned by OA hypertrophic chondrocyte on endothelial cells migration, invasion and adhesion was evaluated in functional assays. Moreover, hypertrophic OA chondrocytes were tested for the expression of angiogenic factors by real-time RT-PCR. RESULTS: Specific markers of hypertrophy and observation of cellular morphology attested of the hypertrophic phenotype of chondrocytes in our culture model. Functional angiogenesis assays showed that factors produced by hypertrophic chondrocytes stimulated migration, invasion and adhesion of endothelial cells. Among the evaluated angiogenic factors, bone sialoprotein (BSP) was the most highly upregulated in hypertrophic chondrocytes. The inhibition of endothelial cell adhesion by a GRGDS peptide confirmed the implication of RGD domain proteins, like BSP, in hypertrophic chondrocyte-induced adhesion of endothelial cells. CONCLUSION: Hypertrophic differentiation of chondrocyte may promote angiogenesis. Our findings established the relation of BSP with OA chondrocyte hypertrophy and suggested that this factor could constitute a potential target to control cartilage neovascularisation in OA.


Assuntos
Cartilagem Articular/metabolismo , Condrócitos/patologia , Células Endoteliais/fisiologia , Neovascularização Patológica/genética , Osteoartrite/genética , Angiopoietina-1/genética , Angiopoietina-1/metabolismo , Cartilagem Articular/citologia , Adesão Celular , Movimento Celular , Células Cultivadas , Condrócitos/metabolismo , Fator 2 de Crescimento de Fibroblastos/genética , Fator 2 de Crescimento de Fibroblastos/metabolismo , Regulação da Expressão Gênica , Humanos , Hipertrofia , Sialoproteína de Ligação à Integrina/genética , Sialoproteína de Ligação à Integrina/metabolismo , Peptídeos e Proteínas de Sinalização Intercelular/genética , Peptídeos e Proteínas de Sinalização Intercelular/metabolismo , Metaloproteinase 2 da Matriz/genética , Metaloproteinase 2 da Matriz/metabolismo , Proteínas de Membrana/genética , Proteínas de Membrana/metabolismo , Neovascularização Patológica/metabolismo , Neovascularização Patológica/fisiopatologia , Fator de Crescimento Neural/genética , Fator de Crescimento Neural/metabolismo , Osteoartrite/metabolismo , Osteoartrite/fisiopatologia , Osteopontina/genética , Osteopontina/metabolismo , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Trombospondina 1/genética , Trombospondina 1/metabolismo , Trombospondinas/genética , Trombospondinas/metabolismo , Regulação para Cima , Fator A de Crescimento do Endotélio Vascular/genética , Fator A de Crescimento do Endotélio Vascular/metabolismo
12.
J Fr Ophtalmol ; 2023 Oct 10.
Artigo em Francês | MEDLINE | ID: mdl-37827943

RESUMO

Glaucoma is a chronic optic neuropathy characterized by progressive sclero-laminar remodeling. The main factor at the origin of these deformations is the intraocular pressure (IOP), the effect of which varies according to the biomechanical properties of the individual lamina cribrosa (LC). In this environment, the LC represents a malleable zone of weakness within a rigid corneoscleral shell. It is a dynamic structure whose movements play a key role in the pathogenesis of glaucoma: displacing it posteriorly, in addition to contributing to the characteristic appearance of glaucomatous cupping, would increase constriction on the nerve fibers and the laminar capillaries. Often incorrectly considered permanent in adults, these deformations have a certain degree of reversibility, which is currently better characterized thanks to progress in imaging techniques. The occurrence of anterior displacement and laminar thickening following a reduction in IOP could thus constitute a good prognostic factor by reducing mechanical stress on this region. These changes would tend to reduce laminar pore tortuosity and shear forces, which are probably key mechanisms of axonal loss in glaucoma.

13.
J Fr Ophtalmol ; 46(2): 129-136, 2023 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-36642595

RESUMO

BACKGROUND: The goal of this study was to assess the efficacy and safety of phacoemulsification combined with iStent Inject® implantation for the treatment of chronic open-angle glaucoma controlled on topical anti-glaucoma medications and associated with cataract. METHODS: This study was a retrospective analysis of patients who underwent phacoemulsification and implantation of an iStent Inject® for chronic open-angle glaucoma associated with cataract. For all patients, pre- and postoperative characteristics, including number of glaucoma medications and intraocular pressure (IOP), were compared using Paired-sample t-tests and Wilcoxon signed-rank tests, respectively. Postoperative visits were scheduled at 7 days and 1, 3, 6, and 12 months after surgery. RESULTS: Forty-nine eyes of 39 patients were included in the study. Mean preoperative IOP at baseline was 16.3±4.3mmHg (range, 10-29mmHg) with a mean of 2.2±1.0mmHg antiglaucoma medications. At 1 month, the mean IOP reduction was 16% (P<0.05) along with an 18.7% reduction in the mean number of medications. At 6 months, the mean IOP was 12.8±2.6, with a mean of 1.1±0.9 antiglaucoma medications. The mean IOP reduction at 6 months was 22% (P<0.05) along with a 49% reduction in the mean number of medications. At 12 months, the mean IOP was 13.8±2.5 with a mean of 1.1±1.2 medications. The mean IOP reduction at 12 months was 15% (P<0.05) along with a 47% reduction in the mean number of medications. No severe device-related side effects were observed. CONCLUSIONS: iStent Inject® implantation combined with phacoemulsification resulted in effective IOP reduction and medication burden in patients with mild to advanced chronic open-angle glaucoma and preoperative IOP well controlled with topical hypotensive medications.


Assuntos
Catarata , Implantes para Drenagem de Glaucoma , Glaucoma de Ângulo Aberto , Hipotensão Ocular , Facoemulsificação , Humanos , Facoemulsificação/efeitos adversos , Facoemulsificação/métodos , Glaucoma de Ângulo Aberto/complicações , Glaucoma de Ângulo Aberto/cirurgia , Estudos Retrospectivos , Agentes Antiglaucoma , Implantes para Drenagem de Glaucoma/efeitos adversos , Malha Trabecular/cirurgia , Catarata/complicações , Pressão Intraocular , Hipotensão Ocular/complicações , Stents/efeitos adversos
14.
J Fr Ophtalmol ; 46(3): 287-299, 2023 Mar.
Artigo em Francês | MEDLINE | ID: mdl-36759249

RESUMO

The corneal epithelium is one of the first tissue barriers of the eye against the environment. In recent years, many studies provided better knowledge of its healing, its behavior and its essential role in the optical system of the eye. At the crossroads of basic science and clinical medicine, the study of the mechanical stresses applied to the cornea makes it possible to learn the behavior of epithelial cells and better understand ocular surface disease. We describe herein the current knowledge about the adhesion systems of the corneal epithelium and their resistance to mechanical stress. We will also describe the involvement of these mechanisms in corneal healing and their role in epithelial dynamics. Adhesion molecules of the epithelial cells, especially hemidesmosomes, allow the tissue cohesion required to maintain the integrity of the corneal epithelium against the shearing forces of the eyelids as well as external forces. Their regeneration after a corneal injury is mandatory for the restoration of a healthy epithelium. Mechanotransduction plays a significant role in regulating epithelial cell behavior, and the study of the epithelium's response to mechanical forces helps to better understand the evolution of epithelial profiles after refractive surgery. A better understanding of corneal epithelial biomechanics could also help improve future therapies, particularly in the field of tissue engineering.


Assuntos
Lesões da Córnea , Epitélio Corneano , Humanos , Fenômenos Biomecânicos , Mecanotransdução Celular , Córnea/fisiologia , Epitélio Corneano/fisiologia , Cicatrização/fisiologia , Lesões da Córnea/terapia
15.
J Fr Ophtalmol ; 46(10): 1227-1231, 2023 Dec.
Artigo em Francês | MEDLINE | ID: mdl-37945427

RESUMO

The surgical management of glaucoma has been enriched in recent years by the arrival of new surgical techniques as a group known as MIGS (minimally invasive glaucoma surgery). The objective of these new techniques is to reduce intraocular pressure (IOP) while limiting the risk of complications of conventional filtering surgery and allowing faster visual recovery. MIGS can be classified into three main categories depending on the route used to promote the outflow of aqueous humor: the trabecular route, the suprachoroidal route and the subconjunctival route. MIGS using the subconjunctival route are also called minimally invasive bleb surgery (MIBS). These new techniques do not replace conventional filtering surgery, which remains the gold standard technique, but now offer new alternatives for the surgical management of glaucoma patients in combination with cataract surgery or as stand-alone procedures.


Assuntos
Extração de Catarata , Cirurgia Filtrante , Implantes para Drenagem de Glaucoma , Glaucoma , Humanos , Glaucoma/cirurgia , Pressão Intraocular , Cirurgia Filtrante/métodos , Extração de Catarata/efeitos adversos
16.
J Fr Ophtalmol ; 46(2): 173-184, 2023 Feb.
Artigo em Francês | MEDLINE | ID: mdl-36635208

RESUMO

Ocular itching and eye rubbing are frequent complaints in an ophthalmology practice. Numerous studies address the consequences of eye rubbing, such as keratoconus. However, there are few studies concerning the pathophysiology of itching, its transmission pathways, or its interactions with eye rubbing. Through this literature review, we will address the various clinical, physiological and therapeutic aspects of this pair of symptoms with a variety of ocular consequences. We will then describe the state of the art in itching and scratching in dermatology, in order to draw a parallel between these two vicious cycles. A better understanding of the pathophysiology of ocular itching and eye rubbing, as well as new studies based on dermatological data, might allow more appropriate clinical management of our patients and their symptoms.


Assuntos
Olho , Ceratocone , Humanos , Ceratocone/diagnóstico , Prurido/diagnóstico , Prurido/etiologia , Prurido/terapia
17.
J Fr Ophtalmol ; 46(7): 697-705, 2023 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-37573231

RESUMO

There is growing interest nowadays for artificial intelligence (AI) in all medical fields. Beyond the direct medical application of AI to medical data, generative AI such as "pre-trained transformer" (GPT) could significantly change the ophthalmology landscape, opening up new avenues for enhancing precision, productivity, and patient outcomes. At present, ChatGPT-4 has been investigated in various ways in ophthalmology for research, medical education, and support for clinical decisions purposes. This article intends to demonstrate the application of ChatGPT-4 within the field of ophthalmology by employing a 'mise en abime' approach. While we explore its potential to enhance the future of ophthalmology care, we will also carefully outline its current limitations and potential risks.


Assuntos
Inteligência Artificial , Oftalmologia , Humanos
18.
Br J Dermatol ; 166(3): 483-90, 2012 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-21967466

RESUMO

BACKGROUND: Functional and structural skin adaptation is a dynamic process which starts immediately after birth in humans and in mammalian skin in general. This adjustment to the extrauterine dry environment is accomplished in the first year of postnatal life of humans. OBJECTIVES: To assess the dynamic changes in vivo after birth in the molecular composition and skin physiology parameters compared with older children and adults. METHODS: The molecular composition of the stratum corneum (SC) and the water profile were investigated noninvasively by in vivo Raman confocal microscopy as a function of depth. Functional parameters including transepidermal water loss (characterizing epidermal permeability barrier), capacitance (as an indirect parameter for SC hydration) and skin surface pH were assessed noninvasively. The measurements were performed in 108 subjects divided into six age groups: full-term newborns (1-15 days), babies aged 5-6 weeks, babies aged 6±1 months, children aged 1-2 years, children aged 4-5 years and adults aged 20-35 years. RESULTS: We showed that skin acidification is still under development during the first weeks of life. While the basal epidermal barrier is competent immediately after birth, the SC is less hydrated in the first 2 weeks of postnatal life. Similar continuous decreasing water content towards the surface for all age groups was observed, whereas this gradient was lower for the newborns. Dynamic changes in the amounts of the natural moisturizing factor constituents were revealed in the period of infancy. CONCLUSIONS: We demonstrated the relation of formation of an acidic pH as well as underlying mechanisms in the induction of a fully hydrated SC over the first weeks of human life as a dynamic functional adaptation.


Assuntos
Adaptação Fisiológica/fisiologia , Água Corporal/fisiologia , Epiderme/fisiologia , Fenômenos Fisiológicos da Pele , Adolescente , Adulto , Criança , Pré-Escolar , Humanos , Concentração de Íons de Hidrogênio , Lactente , Recém-Nascido , Microscopia Confocal , Permeabilidade , Análise Espectral Raman , Perda Insensível de Água/fisiologia , Adulto Jovem
19.
J Fr Ophtalmol ; 45(4): 455-477, 2022 Apr.
Artigo em Francês | MEDLINE | ID: mdl-35168805

RESUMO

Glaucoma is an optic neuropathy in which the primary risk factor is increased intraocular pressure (IOP), attributed to increased resistance to trabecular outflow of aqueous humor (AH). This resistance is believed to result from trabecular degeneration secondary to chronic oxidative stress and cellular senescence but may also involve inflammatory mechanisms whose roles are little known. In fact, inflammatory processes play a major role in the pathophysiology of glaucoma to varying degrees, affecting all structures of the eye, including the ocular surface, the anterior and posterior segments, and even the visual pathways of the brain. These processes are thought to result from dysfunction of a regulatory, protective para-inflammation, becoming chronic and harmful in glaucoma. While the mechanisms of the retinal inflammation which accelerates the degeneration of retinal ganglion cells (RGC) as well as the inflammation of the ocular surface aggravated by long-term use of preserved glaucoma eye drops have been described for several years, very little is known about the pathophysiology of trabecular inflammation in glaucoma. The objective of this literature review is to provide a synthesis of knowledge on the roles and mechanisms of inflammation in both the healthy and glaucomatous trabecular meshwork, as well as its role in the pathophysiology of glaucoma. Therefore, after a review of the mechanisms of cellular senescence and oxidative stress - sources of trabecular inflammation, we will approach the study of the expression and roles of the main inflammatory mediators within the trabecular meshwork. Finally, we will discuss current knowledge on the toxicity of glaucoma eye drops and their preservatives on the ocular surface and trabecular meshwork as well as their role in trabecular inflammation.


Assuntos
Glaucoma , Glaucoma/etiologia , Humanos , Inflamação/complicações , Pressão Intraocular , Soluções Oftálmicas , Malha Trabecular/química
20.
J Fr Ophtalmol ; 45(2): 216-232, 2022 Feb.
Artigo em Francês | MEDLINE | ID: mdl-34991909

RESUMO

In recent years, research in artificial intelligence (AI) has experienced an unprecedented surge in the field of ophthalmology, in particular glaucoma. The diagnosis and follow-up of glaucoma is complex and relies on a body of clinical evidence and ancillary tests. This large amount of information from structural and functional testing of the optic nerve and macula makes glaucoma a particularly appropriate field for the application of AI. In this paper, we will review work using AI in the field of glaucoma, whether for screening, diagnosis or detection of progression. Many AI strategies have shown promising results for glaucoma detection using fundus photography, optical coherence tomography, or automated perimetry. The combination of these imaging modalities increases the performance of AI algorithms, with results comparable to those of humans. We will discuss potential applications as well as obstacles and limitations to the deployment and validation of such models. While there is no doubt that AI has the potential to revolutionize glaucoma management and screening, research in the coming years will need to address unavoidable questions regarding the clinical significance of such results and the explicability of the predictions.


Assuntos
Inteligência Artificial , Glaucoma , Algoritmos , Técnicas de Diagnóstico Oftalmológico , Glaucoma/diagnóstico , Humanos , Testes de Campo Visual
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA