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Stem cells: progressions and applications in clinical medicine
Ali Hosseini Bereshneh , Danesh Soltani , Reza Roodbarani , Mohammad Hossein Modarressi ,
Volume 74, Issue 2 (May 2016)
Abstract

Stem cells are undifferentiated and multi pluripotent cells which can differentiate into a variety of mature cells and tissues such as nervous tissue, muscle tissue, epithelial tissue, skeletal tissue and etc. Stem cells from all different source have three unique features: 1) Proliferative capability: Stem cells are capable of self dividing and self renewing for long periods or more than six months at least that called immortalization. 2) Undifferentiated nature: It’s considered as one of the essential characteristics of stem cell, so it doesn't have any tissue-specific construction. 3) Differentiation to the different cells from all organs: This ability can Induced by tissue specific transcription factors. Because of that, they are so important in prevention and treatment of human disease. Depending on the sources from which they derive, they have different types which can be used to produce special cells and tissues. The most significant types of stem cells are; embryonic stem cells (ESCs) which are derived from embryos, adult stem cells (ASCs) which are derived from differentiated cells in a specific tissue, induced pluripotent stem cells (iPSs) which are produced from adult differentiated cells that have been genetically reprogrammed to act resemble to an embryonic stem cell and cord blood stem cells which contains haematopoietic stem cells and derived from the umbilical cord after gestation. By providing a medium containing of special growth factor, it is possible to orientated stem cell differentiation pathway and gained certain cells from them. The important uses of stem cells includes damaged heart tissue cells improvements and bone tissue repairing, cancer treatment, damaged neurological and spinal tissue repairing, improving burns and injuries and the treatment of diabetes, infertility and spermatogenesis dysfunction. Furthermore, the application of them in gene therapy is an important issue in the modern medicine science due to the role of them in transferring gene into different cells. Today, this method have had considerable progress in the treatment of many disease. In this review study, some aspect of stem cells like types and characteristic, origin, derivation techniques, storage conditions and differentiation to target tissues, current clinical usage and their therapeutic capabilities will be discussed.


Investigating the effect of surgery time on improving the performance of fine movements of lower limbs in patients with traumatic spinal cord injury
Loghman Barani, Hossein Jafari Marandi , Masoud Zeinali, Hossein Safari,
Volume 81, Issue 2 (May 2023)
Abstract
Background: Traumatic Spinal Cord Injury (TSCI) is one of the catastrophic events, the rate of which has been growing compared to the past decades. Complications caused by TSCI have a wide spectrum and can range from complete paralysis to numbness of the limbs. Additional to the injury severity and disability of the patient, the recovery rate depends on the treatment strategies. Despite extensive efforts and research in this field, there are still few treatment options for TSCI patients. Controversial results have been reported, however, spinal cord decompression is the only certainty for the treatment of these patients. In the present study, patients with thoracic and lumbar fractures were undergone decompression, less and more than 24 hours, and the recovery rate (RR) was compared after 6 months.
Methods: In this study, patients with lumbar and thoracic fractures who were referred to the neurosurgery department of Ahvaz Golestan Hospital during May 2019 to December 2021 were included. Decompression was performed at the fracture level as a total and at the upper and lower levels of the fracture as a partial decompression. To evaluate fine motor movements, picking up a small object with toes and following a rectangular path were used. Also, the gross motor movements, upper and lower proximal and distal muscle forces were measured.
Results: 160 patients including 133 men (83.1%) and 16.9% women (27) with 36±12 years mean age were included. The most fracture location was lumbar (53.1%), followed by the thoracic (43.1%) and fractures in both regions (3.8%). The most injured  vertebras were L1 (27.5%) and T12 (18.8%). Six months later, 61.9% of patients had a good score for removing a small object with toe, of which 67.5% belonged to patients with<24 hours surgery (P=0.01). Also, RR for ability to follow a rectangle (P=0.017) and lower limit gross motor were significantly better in patients with<24 surgery (P=0.02). However, no significant difference was found between the two groups for improved sensations (P<0.05).
Conclusion: This study showed that decompression<24 hours in TSCI is associated with a significant improvement in lower fine movements.
 
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