introduction: morphology and ultra-structure of myoid and sertoli cells were studied in patients with non-obstructive azoospermia who were admitted to testicular sperm extraction (tese) and intracytoplasmic sperm injection (icsi), by transmission electron microscopy (tem). materials and methods: 12 biopsies of testicular tissues from patients with non-obstructive azoospermia referred to royan i...

Background: Spermatogenesis is under the control of variety of factors, which include mast cells. Any changes in testicular mast cells’ number and distribution resulting in deterioration of comlex regulation and fine-turning of spermatogenesis. Increased number of mast cells and their abnormal spread pattern have been described in the testis with fertility disturbances. Mast cells’ tryptase enz...

We report a case of double uterine tumor resembling ovarian sex cord tumor (UTROSCT). The tumor was composed of sex cord-like cords, nests and tubules, and bundles of myoid cells. The lesion was interesting especially in regard to histogenesis of intratumoral myoid cells. It is not known whether these cells are neoplastic or whether they represent preexisting myometrial smooth muscle cells entr...

Hamartoma is a local malformation resulting from faulty development in an organ. It was first described breast 1971 by Arrigoni et al and its occurrence very rare. This tumor composed of lobules admixed with fibrous tissue fibroadipose tissue. Myoid hamartoma, also called as muscular hamartoma , smooth muscle cells addition to ducts, lobules, stroma. Here, we report case myoid which occurred 53...

The myoids of retinal cone cells of the blue-striped grunt (Haemulon sciurus) undergo significant elongation during dark adaptation of the retina. Longitudinally oriented microtubules are present in myoids both before and after elongation. Injection of colchicine into the vitreous of the eye in vivo disrupts the microtubules in the myoids and prevents dark-adaptive myoid elongation. Counts of m...

Most common tumors of the spleen are hematologic and lymphoid malignancies. Non-lymphoid and non-hematologic tumors of the spleen are very rare, the most common of which are vascular tumors. This group of tumors in the spleen is composed of heterogeneous tumors such as hemangioma, angioendothelioma (AE), littoral cell angioma, and angiosarcoma. There are several histologic forms of AE such as e...

FSH stimulates testicular growth by increasing Sertoli cell proliferation and elongation of seminiferous cords. Little is known about the peritubular myoid cells in testicular development. In order to investigate the role of peritubular myoid cells in early testicular growth in rodents, two traditional models to induce testicular growth were used: FSH treatment and hemicastration. In order to a...

The presence of the HGF/Met system in the testicular myoid cells was first discovered by our group. However, the physiological role of this pathway remains poorly understood. We previously reported that HGF increases uPA secretion and TGF-β activation in cultured tubular fragments and that HGF is maximally expressed at Stages VII-VIII of the seminiferous epithelium cycle, when myoid cell contra...

most common tumors of the spleen are hematologic and lymphoid malignancies. non-lymphoid and non-hematologic tumors of the spleen are very rare, the most common of which are vascular tumors. this group of tumors in the spleen is composed of heterogeneous tumors such as hemangioma, angioendothelioma (ae), littoral cell angioma, and angiosarcoma. there are several histologic forms of ae such as e...

less than 5% of prenatal thymoctes express hla-dr before week 12 of gestation. however, the number of hla-dr- positive cells increases during the late second and third trimesters of development. to determine the role of alpha-smooth muscle actin in fetal thymic hla-dr signaling in different stages of development we examined and compared the immunohistochemical expression of alpha-smooth muscle ...