naturally the brain is ineffective in regenerating functional tissue after disease or injury, so to overcome these defects innovative curative strategies such as stem cell transplantation and tissue engineering have to be considered. researchers investigate the use of strategies to attain better functional repair results. one of the important challenges of effective transplantation is the deliv...

dendritic cells (dcs) are a heterogeneous family of professional apcs involved in priming adaptive immune responses. donor dcs (direct pathway of allorecognition) and recipient dcs presenting processed donor major histocompatibility complex (mhc) as peptides (indirect pathway of allorecognition) participate actively in graft rejection by stimulating recipient t cell responses following organ tr...

objective: helicobacter pylori has a well-established role in the development of gastric cancer. in vitro studies reveal increased proliferation of the gastric mucosa in the presence of h. pylori infection. it has been also shown that production of some cytokines, such as interleukin-1 beta (il-1b) is increased in h. pylori infection. in addition, il-1b increases proliferation of gastric epithe...

tuberculosis is an important opportunistic disease among hiv- infected persons worldwide; from march 1999 to feburery 2001 we had seventeen patients with hiv-infection and tuberculosis. here we are presenting the clinical manifestations, diagnosis, treatment and outcome of them. all of them were male, 11 patients had pulmonary and 5 patients had extrapulmonary (pleural effusion 1, hepatic granu...

introduction: cytokines are a large group of proteins play a key role in inflammation. down-regulation of pro-inflammatory cytokines has beneficial effect on heart function. propranolol, as a non selective beta-adrenergic blocker, has been extensively used for treatment of many cardiovascular problems such as arrhythmias and heart malfunction. in addition anti-inflammatory effects of propranolo...

calcium-binding proteins play essential roles in the cell. one important class of calcium-binding proteins is the annexin family. this is a family of 13 proteins, which binds to phospholipids in a calcium-dependent manner. osteosarcoma cell line (mg-63) is a transformed cell that has many characteristics of the differentiated cell, such as a considerable serum dependency in its growth rate. usi...

background: despite major progress in our general knowledge related to the application of adult stem cells, finding alternative sources for bone marrow mesenchymal stem cells (mscs) has remained to be challenged. in this study successful isolation, multilineage differentiation, and proliferation potentials of sheep mscs derived from bone marrow, adipose tissue, and liver were widely investigate...

objective: one of the major issues in bone tissue engineering is the design and fabrication of bioactive, bioresorbable porous 3d scaffolds capable of maintaining their structure and integrity over a predictable period of time. one such approach is the fabrication of composite scaffolds. methods: in this study we present fabrication and characterization of novel silk/bioglass-composite scaffold...

stem cells located at the limbus ,  are the ultimate source for regeneration of the corneal epithelium in the normal and traumatized states.  when limbal stem cells are dysfunctional or deficient, limbal stem cell deficiency (lscd) develops. its surgical management depends on laterality and severity of corneal-limbal involvement. conventional methods of stem cell transplantation are conjunctiva...

background: vhl (von hippel-lindau), runx-3 (runt-related transcription factor 3), e-cadherin (epithelial cadherin), p15 (ink4a, cyclin dependent kinase inhibitor), and p16 (ink4b) genes are essential in hematopoiesis. the aim of this study was to explore the correlation between gene expression and promoter methylation in cd34+ stem cells before and after differentiation to erythroid lineage. m...