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YILDIZ, PELİN

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Now showing 1 - 10 of 15
  • PublicationOpen Access
    Effects of Orally Consumed <i>Rosa damascena</i> Mill. Hydrosol on Hematology, Clinical Chemistry, Lens Enzymatic Activity, and Lens Pathology in Streptozotocin-Induced Diabetic Rats.
    (2019-11-10T00:00:00Z) Demirbolat, İ; Ekinci, C; Nuhoğlu, F; Yıldız, PELİN; Geçer, MÖ; KARTAL, MURAT; YILDIZ, PELİN
    Diabetes mellitus is a multisystemic metabolic disorder that may affect the eyes, kidneys, vessels, and heart. Chronic hyperglycemia causes non-enzymatic glycation of proteins and elevation of the polyol pathway resulting in oxidative stress that damages organs. The current study aimed to investigate the dose-dependent effects of orally consumed Rosa damascena Mill. hydrosol on hematology, clinical biochemistry, lens enzymatic activity, and lens pathology in streptozotocin (STZ)-induced diabetic rats. Diabetes was induced into male Sprague-Dawley rats by intraperitoneal administration of STZ (40 mg/kg body weight). Rose hydrosols containing 1515 mg/L and 500 mg/L total volatiles (expressed as citronellol) were introduced to rats orally for 45 days. Consumption of 1515 mg/L volatile containing rose hydrosol successfully ameliorated hematologic, hepatic, and renal functions. Hydrosols also attenuated hyperglycemia and decreased the advanced glycation end-product formation in a dose-dependent manner. Rose hydrosol components significantly increased the lens enzymatic activities of glutathione peroxidase and decreased the activity of aldose reductase to prevent cataractogenesis. Histopathological examinations of rat lenses also indicated that increasing the dose of rose hydrosol had a protective effect on lenses in diabetic conditions. Additionally, in silico modeling of aldose reductase inhibition with rose hydrosol volatiles was carried out for extrapolating the current study to humans. The present results suggest that rose hydrosol exerts significant protective properties in diabetes mellitus and has no toxic effect on all studied systems in healthy test groups.
  • PublicationOpen Access
    Inverted (hobnail) high-grade prostatic intraepithelial neoplasia and invasive inverted pattern
    (2015-10-01) ÖZNUR, MELTEM; YILDIZ, PELİN; BAHADIR, BURAK; BEHZATOĞLU, KEMAL; YILDIZ, PELİN
    High-grade prostatic intraepithelial neoplasia (HGPIN) is considered to be an important precursor for prostatic adenocarcinoma. The present study aimed to investigate the histological features of the uncommon inverted (hobnail) pattern of HGPIN in transrectal ultrasonographic (TRUS) prostatic needle biopsies from 13 cases. These 13 diagnosed cases of inverted HGPIN were identified out of a total of 2,034 TRUS biopsies (0.63%), obtained from patients suspected to have prostate cancer. The hobnail pattern is comprised of secretory cell nuclei, which are histologically localized at the luminal surface of the prostate gland, rather than the periphery, and exhibit reverse polarity. Histological examinations were performed and the results demonstrated that 5 of the 13 cases exhibited pure inverted histology, while HGPIN was observed to be histologically associated with other patterns in the remaining 8 patients. In addition, an association with adenocarcinoma was identified in 7 of the 13 cases. All 7 carcinomas accompanied by inverted HGPIN were conventional acinar adenocarcinoma cases; of note, for these 7 cases, the Gleason score was 7 for each. One acinar adenocarcinoma case accompanying inverted HGPIN demonstrated hobnail characteristics in large areas of the invasive component. It was observed that nuclei were proliferated in the invasive cribriform glands, which was comparable to that of inverted HGPIN, and were located on the cytoplasmic luminal surface; a similar morphology was also observed in individual glands. In conclusion, the results of the present study suggested that the hobnail HGPIN pattern may be of diagnostic importance due to its high association with adenocarcinoma and the high Gleason scores in the accompanying carcinomas.
  • PublicationOpen Access
    Diffusion MRI on lymph node staging of gastric adenocarcinoma
    (2015-06-01) HASBAHCECI, Mustafa; Akcakaya, ADEM; Memmi, NAİM; TURKMEN, Ihsan; Cipe, Gokhan; Yildiz, PELİN; Arici, DİLEK SEMA; MUSLUMANOGLU, Mahmut; AKÇAKAYA, ADEM; MEMMİ, NAİM; YILDIZ, PELİN; ARICI, DILEK SEMA
    Objective: The purpose of this study was to evaluate the accuracy of diffusion weighted magnetic resonance imaging (MRI) in preoperative assessment of metastatic lymph nodes of gastric cancer. Methods: A total of 23 gastric cancer patients with a mean age of 59.4±10.9 years were analyzed. Lymph nodes were grouped as perigastric lesser curvature (Group Ia), perigastric greater curvature (Group Ib), D1+/D2 lymph nodes (Group II). Identification of histologically metastatic lymph nodes by diffusion weighted MRI was regarded as the main outcome. Results: A total of 1,056 lymph nodes including 180 histologically proven metastatic lymph nodes were dissected. Although diffusion weighted MRI could identify the metastatic lymph nodes in 18 out of 23 patients (77.8%), only 69 of total 1,056 nodes (6.53%), either metastatic or non-metastatic, could be detected. There was no correlation between histopathology and diffusion weighted MRI with regard to lymph node groups (P>0.05 for all). Overall accuracy was calculated as 69.56, 65.21 and 52.17 for Groups II, Ib and Ia lymph nodes, respectively. Apparent diffusion coefficient (ADC) values could not be helpful to differentiate metastatic lymph nodes (P=0.673). Conclusions: Diffusion weighted MRI has low accuracy to detect or to differentiate metastatic and non-metastatic lymph nodes based on their ADC values in gastric cancer.
  • PublicationOpen Access
    N-acetylcysteine suppresses colistimethate sodium-induced nephrotoxicity via activation of SOD2, eNOS, and MMP3 protein expressions.
    (2018-11-01T00:00:00Z) Ceylan, B; Ozansoy, M; Kılıç, Ü; Yozgat, Y; Ercan, Ç; Yıldız, PELİN; Aslan, T; YILDIZ, PELİN
    Objective: To investigate the molecular mechanisms of colistimethate sodium-induced nephrotoxicity and the protective effect of N-acetylcysteine (NAC) against nephrotoxicity. Methods: Twenty-eight Wistar rats were divided into four groups comprised of control, colistin, NAC, and colistin–NAC co-treatment, respectively. Serum creatinine and urine N-acetyl-b-D-glucosaminidase (NAG) levels were measured at different time intervals. Histological changes, apoptosis, total oxidant and antioxidant status, and the expression levels of endothelial nitric oxide synthase (eNOS), superoxide dismutase 2 (SOD2), and matrix metalloproteinase 3 (MMP3) were evaluated in renal tissue. Results: In the colistin group, post-treatment creatinine levels were higher than pretreatment levels (p ¼ .001). There was a significant increase in urine NAG level following colistin treatment on day 10, compared to the baseline value and the first day of treatment (p ¼ .001 and .0001, respectively). Urine NAG levels were higher in the colistin group on the 10th day of treatment than in the other groups (p < .01). Colistin treatment increased the apoptosis index and renal histological damage score (RHDS) significantly and these changes were reversed in NAC co-treatment (RHSD and apoptosis index were 45 and 0 for sterile saline group, 29 and 2 for NAC group, 122 and 7 for colistin group, and 66 and 2 for colistin þ NAC group). We observed no difference between groups regarding total antioxidant and total oxidant status in the kidneys. The expression levels of eNOS, SOD2, and MMP3 decreased significantly in the kidneys of colistin-treated rats; these changes were reversed in the kidneys of NAC co-treated rats. Conclusions: N-acetylcysteine prevented colistin-induced nephrotoxicity through activation of expression levels of SOD2, eNOS, and MMP3.
  • PublicationOpen Access
    Merkel Cell Carcinoma
    (2023-01-01) Sönmez Ergün, Selma ; Kirazoğlu, Ahmet; Akdemir, Osman Cemil; Su Küçük, Özlem; Altınok, Pelin; Yıldız, Pelin; ERGÜN, SELMA; AKDEMİR, OSMAN CEMİL; KİRAZOĞLU, AHMET; YILDIZ, PELİN; SU KÜÇÜK, ÖZLEM; ALTINOK SÜT, PELİN
    Merkel cell carcinoma (MCC) is a rare tumor that arises from mechanoreceptor Merkel cells. Ultraviolet exposure, immunosuppression and Merkel cell polyoma virus play a significant role in tumor pathogenesis. Although it typically presents as an initially indolent growing, painless solitary lesion, the course of MCC may be aggressive due to the nodal invasion, distant metastasis and high recurrence rates. We presented a case of MCC with a background history of rheumatoid arthritis treated with immunosuppressive therapy for many years who had necrotizing granulomatous lymphadenitis.
  • PublicationOpen Access
    Dermatoscopic findings of pigmented purpuric dermatosis
    (2016-09-01) Su, Ozlem; OZKAYA, Dilek Biyik; Emiroglu, NAZAN; Cengiz, FATMA PELİN; Bahali, ANIL GÜLSEL; Yildiz, PELİN; DEMIRKESEN, Cuyan; Onsun, NAHİDE; EMİROĞLU, NAZAN; SU KÜÇÜK, ÖZLEM; CENGİZ, FATMA PELIN; BAHALI, ANIL GÜLSEL; YILDIZ, PELİN; ONSUN, NAHIDE
    ackground:: Pigmented purpuric dermatosis is a chronic skin disorder of unknown aetiology characterised by symmetrical petechial and pigmented macules, often confined to the lower limbs. The aetiology of pigmented purpuric dermatosis is unknown. Dermatoscopy is a non-invasive diagnostic technique that allows the visualisation of morphological features invisible to the naked eye; it combines a method that renders the corneal layer of the skin translucent with an optical system that magnifies the image projected onto the retina. Objectives:: The aim of this study is to investigate the dermatoscopic findings of pigmented purpuric dermatosis. Methods:: This study enrolled patients diagnosed histopathologically with pigmented purpuric dermatosis who had dermatoscopic records. We reviewed the dermatoscopic images of PPD patients who attended the outpatient clinic in the Istanbul Dermatovenereology Department at the Bezmialem Vakıf University Medical Faculty. Results:: Dermatoscopy showed: coppery-red pigmentation (97%, n = 31) in the background, a brown network (34%, n = 11), linear vessels (22%, n = 7), round to oval red dots, globules, and patches (69%, n = 22; 75%, n = 24; 34%, n = 11; respectively), brown globules (26%, n = 8) and dots (53%, n = 17), linear brown lines (22%, n = 7), and follicular openings (13%, n = 4). Conclusion:: To our knowledge, this is the first study to report the dermatoscopy of pigmented purpuric dermatosis. In our opinion, dermatoscopy can be useful in the diagnosis of pigmented purpuric dermatosis.
  • PublicationMetadata only
    Melanoma arising in a chronic pressure ulcer.
    (2019-04-01T00:00:00Z) Cengiz, FP; Kelahmetoglu, O; Guneren, E; Yildiz, PELİN; CENGİZ, FATMA PELIN; YILDIZ, PELİN; GÜNEREN, ETHEM
  • PublicationMetadata only
    Traumatic Avulsion of Upper Eyelid Skin Following Surgery in a Patient With Multiple Myeloma and Amyloid Light-chain Amyloidosis
    (2020-09-01T00:00:00Z) ERGÜN, SELMA; ZENGİN, SENİYYE ÜLGEN; ÜNAL, Mustafa; YILDIZ, PELİN; ERGÜN, SELMA; ÜNAL, MUSTAFA; YILDIZ, PELİN
    Multiple myeloma (MM) is a common hematologic malignancy. Primary systemic amyloidosis or amyloid light-chain (AL) amyloidosis is a rare disease. PURPOSE: This article presents the case of a patient with MM and AL amyloidosis who experienced a severe case of medical adhesive-related skin injury. CASE STUDY: A 64-year-old man with MM, AL amyloidosis, and diabetes presented with a necrotic wound on his left heel that required surgical debridement. The patient experienced a traumatic avulsion of the right upper eyelid skin during the removal of the corneal abrasion preventive tape as well as traumatic avulsion of the left upper eyelid skin while the patient-s face was being cleansed. The avulsed right upper eyelid skin above the tarsus was repaired with a full-thickness skin graft. The partly avulsed left upper eyelid skin was repositioned, and an excisional biopsy was taken. Both upper eyelids healed uneventfully. The biopsy specimen revealed increased amyloid deposition in the dermis, subcutaneous tissue, and areas surrounding the veins and sweat glands. CONCLUSION: This case illustrates the increased risk of medical adhesive-related skin injury and other skin damage in patients with MM and AL amyloidosis. In these patients, the use of tape should be avoided to prevent intraoperative corneal abrasion.
  • PublicationOpen Access
    New Markers in Atherosclerosis: Thrombospondin-2 (THBS-2) and Leukocyte Cell-Derived Chemotaxin-2 (LECT-2); An Immunohistochemical Study.
    (2016-12-01) AKTHSR, Muhammad Salman; SÖNMEZ, FATMA CAVİDE; YILDIZ, PELİN; TANRIKULU, MEHMET AKİF; AYDIN, CEMALETTİN; KAHRAMAN AY, NURAY; SÖNMEZ, FATMA CAVİDE; YILDIZ, PELİN; AYDIN, CEMALETTİN; KAHRAMAN AY, NURAY
    BACKGROUND Current research investigating the role of THBS2 and LECT-2 in atherogenesis is very limited. Therefore, we designed this study to demonstrate the role of THBS-2 and LECT-2 in atherosclerosis at the tissue level in fresh specimens. MATERIAL AND METHODS A total of 32 patients who underwent coronary bypass surgery were enrolled. Aortic wall punch biopsies were obtained at the site of proximal aortosaphenous bypass graft anastomosis. A specimen of left internal mammarian artery (LiMA) was taken from the segment just proximal to its anastomosis. The aortic tissue is representive of the atherosclerotic tisue, and LiMA tissue is representative of the non-atherosclerotic area. The specimens were painted with CD68 for macrophage, and THBS-2 and LECT-2 antibodies for immunohistochemical staining. RESULTS Aortic THBS-2 levels were significantly lower, whereas aortic LECT-2 levels were significantly higher when compare to LiMA (14.4±9.9 (5-30) and 36.9±13.0 (5-60) p: 0.0001 and 20.3±15.0 (5-60) and 20.8±13,8 (10-30) p: 0.0001, respectively). CD68+ and monocyte level correlated significantly with AHA atherosclerosis grade (p=0.01, r=0.45 and p=0.001, r=0.56, Spearman's test). CD68+ level correlated significantly with LECT-2 levels in atherosclerotic aortic tissue (p=0.026, r=0.392, Spearman's test), whereas aortic TSBN-2 levels were not. CONCLUSIONS The present study has taken the first steps to highlight new markers in atherosclerosis by using immunohistochemical method. The study results suggest that the tissue levels of THBS2 and LECT-2 may correlate with the stage of atherosclerosis.
  • PublicationOpen Access
    Cytological features of pure micropapillary carcinoma of various organs: A report of eight cases
    (2014-08-01T00:00:00Z) HUQ, Gulben Erdem; Canberk, Sule; Oznur, Meltem; Yildiz, PELİN; Bahadir, Burak; BEHZATOĞLU, Kemal; YILDIZ, PELİN
    Micropapillary carcinoma (MPC) is a rare aggressive tumor, which generally accompanies the primary carcinoma of the organ of its origin, while the pure form is extremely uncommon. Angiolymphatic involvement is widespread and a considerable proportion of the cases present with metastases. The current study presents eight pure MPC cases arising from the breast (n=3), urinary bladder (n=3), parotid gland (n=1) and lung (n=1, presenting with pericardial effusion), with the cytological findings. The eight patients included three female and five male cases aged between 48 and 74 years. The most common cytological findings were three-dimensional aggregates, cell clusters with angulated or scalloped borders, single cells with a columnar configuration and eccentric nuclei, and high-grade nuclear features. Histopathological sections showed accompanying in situ ductal carcinoma in the cases of MPC arising in the parotid gland and breast (n=3), and one case in the bladder exhibited only in situ MPC. The average follow-up period was 20 months (range, 6-54 months) and, during this period, three patients succumbed to the disease. At present, four patients are alive with disease and one patient is alive and disease-free. In conclusion, cytology is an important tool for the diagnosis and management of MPC.