The c-Jun NH(2)-terminal kinase (JNK) group of mitogen-activated protein kinases is stimulated in response to a wide array of cellular stresses and proinflammatory cytokines. Mice lacking individual members of the Jnk family (Jnk1, Jnk2, and Jnk3) are viable and survive without overt structural abnormalities. Here we show that mice with a compound deficiency in Jnk expression can survive to birth, but fail to close the optic fissure (retinal coloboma). We demonstrate that JNK initiates a cytokine cascade of bone morphogenetic protein-4 (BMP4) and sonic hedgehog (Shh) that induces the expression of the paired-like homeobox transcription factor Pax2 and closure of the optic fissure. Interestingly, the role of JNK to regulate BMP4 expression during optic fissure closure is conserved in Drosophila during dorsal closure, a related morphogenetic process that requires JNK-regulated expression of the BMP4 ortholog Decapentaplegic (Dpp).
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http://dx.doi.org/10.1101/gad.1087303 | DOI Listing |
J Esthet Restor Dent
January 2025
Department of Prosthodontics, Propaedeutics and Dental Materials, School of Dentistry, Christian-Albrechts University at Kiel, Kiel, Germany.
Objective: Investigation of the mechanical properties of occlusal veneers made from zirconia with varying translucency, bonded to different tooth substrates.
Materials And Methods: Sixty-four extracted molars were divided into two groups: preparation within enamel (E) or extending into dentin (D). Veneers were milled from four zirconia ceramics (n = 8): 5Y-TZP (HT), a multilayer of 5 and 3Y-TZP (GT), 3Y-TZP (LT), and 4Y-TZP (MT).
Cureus
November 2024
Department of Ophthalmology, College of Medicine, University of Bisha, Bisha, SAU.
Stilling-Duane syndrome, a congenital condition characterized by aberrant innervation of the lateral rectus muscle and agenesis of the abducent nerve or its nucleus, results in limited horizontal eye movements. It is often misdiagnosed as acquired abducent nerve paralysis. This report highlights the importance of considering Stilling-Duane syndrome in differential diagnoses.
View Article and Find Full Text PDFOphthalmic Plast Reconstr Surg
January 2025
Hariram Motumal Nasta & Renu Hariram Nasta Ophthalmic Plastic Surgery Services.
Purpose: To report the long-term surgical outcomes of acquired ankyloblepharon correction using mucous membrane graft.
Methods: Five eyes of 4 patients (median age, 19 years) with acquired ankyloblepharon were managed using eyelid splitting and mucous membrane graft anchored to the recti muscles on the bulbar surface in the respective quadrant and onto the bare tarsal surface. Outcome measures include a change in the palpebral fissure width, ability to fit scleral contact lenses, visual acuity, and cosmesis.
Ophthalmic Plast Reconstr Surg
December 2024
Adnexal Department, Moorfields Eye Hospital, NHS Foundation Trust, London, United Kingdom.
Purpose: Euryblepharon is a rare congenital eyelid malformation characterized by symmetrical horizontal enlargement of the palpebral fissure. The eyelid is shortened vertically compared with the horizontal dimension. The lateral canthus is most commonly affected.
View Article and Find Full Text PDFJ Zoo Wildl Med
December 2024
Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210, USA.
American alligators () are an important apex predator of semiaquatic habitats of the southern United States. Commercial alligator farming has grown in the last several decades, leading to a need to understand the health conditions that affect this species to ensure appropriate management and welfare. The aims of this study were 1) to establish and describe normative data including results of common ophthalmic diagnostic tests and conjunctival flora, 2) document ocular pathology in this population, and 3) assess the effect of topical rocuronium bromide and 10% phenylephrine for facilitating pharmacologic mydriasis.
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