Tıp Fakültesi / Faculty of Medicine

Permanent URI for this collectionhttps://hdl.handle.net/11727/1403

Browse

Filters

2012 - 20174

Settings

Subject: search.filters.subject.Testis

Search Results

Now showing 1 - 4 of 4
  • No Thumbnail Available
    Item
    The Separation of The Epididymis and The Abnormal Attachment of The Gubernaculum Cause Undescendence in The Rat Testes
    (2014) Acer, Tugba; Hicsonmez, Akgun; https://orcid.org/0000-0001-5391-9094; 25217829; E-4455-2019
    Epididymal anomalies are common in cryptorchid patients. This led us to consider that anomalies of the epididymis, to which the gubernaculum is attached, or abnormal attachment of the cranial end of the gubernaculum, could lead to cryptorchidism. Twenty-eight male Sprague-Dawley rats were divided into two groups: In Group 1 rats (n = 14), the epididymis was isolated from the testis, and in Group 2 rats (n = 14), the gubernaculum was isolated from the epididymis and re-attached to the tail of the epididymis. In both groups, the non-operated testes were used as the control. In Group 1, cryptorchidism rates were 1/14 in the control testes and 8/14 in the operated testes (p < 0.01). In Group 2, cryptorchidism rates were 0/13 in the control testes and 6/13 in the operated testes (p < 0.01). Cryptorchidism was seen when the epididymis was loosely or non-connected to the testis and the gubernaculum was attached solely to the epididymis (mimicking anomalies of ductal fusion) and when the gubernaculum was attached to the tail of the epididymis (mimicking anomalies of ductal suspension). Therefore epididymal anomalies and abnormal attachment of the gubernaculum may play a role in the undescendence of the testes in the rats.
  • No Thumbnail Available
    Item
    Dosimetric Analysis of Testicular Doses in Prostate Intensity-Modulated and Volumetric-Modulated Arc Radiation Therapy at Different Energy Levels
    (2016) Onal, Cem; ArsIan, Gungor; Dolek, Yemliha; Efe, Esma; 0000-0002-2742-9021; 27623736; D-5195-2014
    The aim of this study is to evaluate the incidental testicular doses during prostate radiation therapy with intensity-modulated radiotherapy (IMRT) and volumetric-modulated arc radiotherapy (VMAT) at different energies. Dosimetric data of 15 patients with intermediate-risk prostate cancer who were treated with radiotherapy were analyzed. The prescribed dose was 78 Gy in 39 fractions. Dosimetric analysis compared testicular doses generated by 7-field intensity-modulated radiotherapy and volumetric modulated arc radiotherapy with a single arc at 6, 10, and 15 MV energy levels. Testicular doses calculated from the treatment planning system and doses measured from the detectors were analyzed. Mean testicular doses from the intensity-modulated radiotherapy and volumetric-modulated arc radiotherapy per fraction calculated in the treatment planning system were 16.3 +/- 10.3 cGy vs 21.5 +/- 11.2 cGy (p = 0.03) at 6 MV, 13.4 +/- 10.4 cGy vs 17.8 +/- 10.7 cGy (p = 0.04) at 10 MV, and 10.6 +/- 8.5 cGy vs 14.5 +/- 8.6 cGy (p = 0.03) at 15 MV, respectively. Mean scattered testicular doses in the phantom measurements were 99.5 +/- 17.2 cGy, 118.7 +/- 16.4 cGy, and 193.9 +/- 14.5 cGy at 6, 10, and 15 MV, respectively, in the intensity-modulated radiotherapy plans. In the volumetric-modulated arc radiotherapy plans, corresponding testicular doses per course were 90.4 +/- 16.3 cGy, 103.6 +/- 16.4 cGy, and 139.3 +/- 14.6 cGy at 6, 10, and 15 MV, respectively. In conclusions, this study was the first to measure the incidental testicular doses by intensity-modulated radiotherapy and volumetric-modulated arc radiotherapy plans at different energy levels during prostate-only irradiation. Higher photon energy and volumetric-modulated arc radiotherapy plans resulted in higher incidental testicular doses compared with lower photon energy and intensity-modulated radiotherapy plans. (C) 2016 American Association of Medical Dosimetrists.
  • Thumbnail Image
    Item
    Distribution and number of Cajal-like cells in testis tissue with azoospermia
    (2017) Hasirci, Eray; Turunc, Tahsin; Bal, Nebil; Goren, Mehmet Resit; Celik, Huseyin; Kervancioglu, Enis; Dirim, Ayhan; Tekindal, Mustafa Agah; Ozkardes, Hakan; 0000-0002-7936-2172; 0000-0003-2898-485X; 0000-0002-2001-1386; 0000-0002-7277-449X; 0000-0002-4060-7048; 0000-0002-4147-2966; 0000-0003-3465-9092; 28359405; ABD-4332-2020; AAJ-5689-2021; Y-6143-2019; AAH-1052-2020; U-9270-2018; AAI-7997-2021; AAA-3033-2021; AAM-4475-2021
    We investigated the number and distribution of Cajal-like cells in patients with azoospermia. A total of 99 patients with non-obstructive azoospermia were divided into subgroups [19 patientsin hypospermatogenesis group (S1), 40 patients in maturation arrest group (S2), 20 patients in a Sertoli cell-only syndrome (S3), and 20 patients in a testicular atrophy and fibrosis group (S4)], and 20 patients with obstructive azoospermia group (SO). Sections stained with a c-kit antibody were studied by light microscopy to determine the number and distribution of Cajal-like cells in peritubular and perivascular areas of testis. The number of Cajal-like cells were higher in all the non-obstructive groups than in the obstructive group (S0: 2.43 cells/mm(2), S1: 3.14 cells/mm(2), S2: 4.00 cells/mm(2), S3: 4.57 cells/mm(2), S4: 3.86 cells/mm(2)) but statistically significantly different (p < 0.05) in the S2 and S3 subgroups only. Distribution of Cajal-like cells were similar in all groups. The number and distribution of Cajal-like cells in non obstructive groups suggest that these cells may affect spermatogenesis. This cellular type can be responsible for the regulation of cellular motility or spermatogenesis. Electrophysiological and electron microscopic studies are needed to better define morphology and function of Cajal-like cells in the testis, especially totally the normal testis tissue. Copyright (C) 2017, Kaohsiung Medical University. Published by Elsevier Taiwan LLC.
  • Thumbnail Image
    Item
    Testis dokusundaki cajal benzeri hücrelerin sperm matürasyon evrelerine olası etkilerinin değerlendirilmesi
    (Başkent Üniversitesi Tıp Fakültesi, 2012) Hasırcı, Eray; Turunç, Tahsin
    Cajal hücreleri, gastrointestinal sistemde motiliteyi düzenleyen pacemaker hücrelerdir. Üriner sistemde de Cajal benzeri hücrelerin motilite regülasyonunda rol oynadıkları düşünülmektedir. Bu hücrelerin testiste rol aldıkları görev bilinmemektedir. Çalışmamızda nonobstrüktif azoospermi nedeniyle Testiküler Sperm Ekstraksiyonu (TESE) yapılan hastaların testis biyopsilerinde Cajal benzeri hücrelerin sayı ve dağılımlarındaki değişimlerin incelenmesi amaçlanmıştır. Çalışmamızda nonobstrüktif azoospermi nedeniyle TESE yapılan 99 çalışma grubu olgusu subgruplara ayrılmış (hipospermatogenez grubunda 19, matürasyon arresti grubunda 40, Sertoli cell only sendromu grubunda 20 ve testiküler atrofi ve fibrozis grubunda 20 olgu) ve obstrüktif azoospermi nedeniyle TESE yapılan 20 kontrol grubu olgusu ile karşılaştırılmıştır. Elde edilen kesitlerde CD117 kullanılarak Cajal benzeri hücrelerin sayı ve dağılımları immünhistokimyasal olarak incelenmiştir. Kontrol grubuna göre tüm çalışma gruplarında Cajal benzeri hücre sayıları daha fazla idi. Bu artış matürasyon arresti ve Sertoli cell only sendromu subgrublarında istatistiksel olarak anlamlı idi (p<0.05). Tüm gruplarda Cajal benzeri hücrelerin dağılımları birbirlerine benzerdi. Cajal benzeri hücrelerin nonobstrüktif azospermili hastalardaki sayıca artışı, bu hücrelerin spermatogenezi olumsuz yönde etkiledikleri ya da spermatogenezden bağımsız rolleri olabileceğini düşündürmektedir. Testiste Cajal benzeri hücrelerin morfolojik yapısını ve fonksiyonlarını daha iyi tanımlamak