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    Evaluation of meibomian glands in childhood malnutrition
    (Nature Portfolio, 2025) Yavrum, Fuat; Yavrum, Begum; Yuksel-Sukuen, Elmas; Sahinoglu-Keskek, Nedime
    Childhood malnutrition is a condition that affects a large population and can have significant implications for eye health. Our study aims to assess the impact of childhood malnutrition to the ocular surface by evaluating meibomian gland morphology and function. This study included 92 patients aged 6-18 years, with 52 diagnosed with malnutrition and 40 serving as healthy controls. Patients' nutritional status was determined based on body mass index (BMI) according to WHO criteria. Meibomian gland morphology and function were assessed using non-invasive imaging techniques and clinical evaluations along with the bloodwork results, including serum ferritin, hemoglobin, serum 25-hydroxyvitamin D, and vitamin B12 levels. Children with malnutrition exhibited significantly lower mean BMI, hemoglobin, serum 25-hydroxyvitamin D, serum ferritin levels and significantly worse meibomian gland loss (MGL) compared to healthy controls (p < 0.001 for all). However, differences in mean non-invasive tear break-up time (NI-BUT) and vitamin B12 levels were not statistically significant. Subgroup analysis based on malnutrition severity revealed no significant differences in MGL or NI-BUT levels. Negative correlations were observed between BMI and MGL, as well as between MGL and serum ferritin and 25-hydroxyvitamin D levels (p < 0.001 for all). This study provides novel insights into the ocular consequences of malnutrition in children, highlighting significant alterations in meibomian gland morphology and function associated with nutritional deficiencies. These findings may inform targeted interventions to reduce ocular morbidity and improve the overall health outcomes of malnourished children.
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    Investigation of the Neuroprotective Effect of Riluzole on Matrix Metalloproteinases in an Experimental Model of Glaucoma
    (Wolters Kluwer Medknow Publications, 2024) Yildiz, Fatma; Sahinoglu-Keskek, Nedime; Yilmaz, Isil Tan; Candan, Ibrahim Aydin; Korkmaz, Orhan Tansel
    Purpose: To investigate the neuroprotective effect of riluzole through matrix metalloproteinase-2 (MMP-2) and MMP-9 in rats, in an experimental glaucoma model. Methods: A total of 28 Wistar albino rats, 3-4 months old, weighing 250-300 g, were divided into four groups; Group I (control), Group II (glaucoma), Group III (glaucoma + corn oil + dimethyl sulfoxide (DMSO), and Group IV (glaucoma + corn oil + DMSO + riluzole). A glaucoma model was created by episcleral vein cauterization in the left eyes of Group II, III, and IV subjects. After the formation of the model, daily intraperitoneal riluzole (5 mg/kg) administration was started. At the end of 7 weeks, retinal tissues were taken and some parts of them were stained with hematoxylin and eosin for histopathological examinations. In the other part, MMP-2 and MMP-9 expressions were determined using real-time quantitative PCR and immunohistochemical techniques. Results: As a result, a statistically significant increase in intraocular pressures (IOP) was found in Groups II, III, and IV when compared with the control eyes after 7 weeks (P < 0.001). There was a decrease in IOP in the riluzole group compared to the glaucoma group. Expression levels in both genes decreased slightly with riluzole administration. In the histopathological evaluation of the groups, it was observed that there were no significant differences between the findings of degeneration in ganglion cells, hemorrhage, and differentiation in layers. Conclusions: MMP-2 and MMP-9 exhibited decreased expression levels in both Group III (glaucoma + corn oil + DMSO) and Group IV (glaucoma + corn oil + DMSO + 5 mg/kg riluzole) compared to the glaucoma groups in Group II. Given that both Group III and Group IV received injections of corn oil + DMSO, this conclusion was drawn.
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    Meibomian gland changes and influencing factors following cataract surgery
    (Springer, 2025) Yavrum, Fuat; Alcikaya, Berra; Acar, Aysegul; Sahinoglu-Keskek, Nedime
    Purpose Meibomian gland dysfunction (MGD) is a leading cause of evaporative dry eye disease (DED), and its exacerbation after cataract surgery has been reported. This study aims to evaluate meibomian gland (MG) morphological and functional changes following cataract surgery and identify influencing factors. Methods This prospective, observational study included 132 patients who underwent phacoemulsification with intraocular lens implantation. Meibomian gland loss (MGL) and non-invasive tear break-up time (NI-BUT) were assessed preoperatively at postoperative week one, and at month one using a corneal topography device via infrared meibography (Sirius, CSO, Italy). Correlations between MGL, NI-BUT, cataract grade, and surgery duration were analyzed. Results Postoperatively, MGL increased at week one (32.0% +/- 15.1) and month one (30.9% +/- 14.5) compared to preoperative values (15.1% +/- 7.0). NI-BUT decreased at both time points (week one: 6.8 s +/- 4.3; month one: 6.7 s +/- 4.6; preoperative: 9.4 s +/- 4.5). A significant correlation was found between increased MGL and longer surgery duration (p < 0.001). ROC analysis identified a surgical duration threshold of 11.5 min, beyond which MGL changes were more pronounced. Conclusions Cataract surgery induces significant MG changes, with increased MGL and reduced NI-BUT postoperatively. Longer surgical duration is a key risk factor for MG deterioration. These findings highlight the importance of ocular surface management in cataract surgery to improve postoperative outcomes.