Objective(s): Pyocyanin is a blue-greenish redox-active pigment, produced by Pseudomonas aeruginosa, with a wide range of biological and biotechnological applications. Pyocyanin biosynthesis is regulated by the quorum-sensing (QS) system in which the expression of QS genes and QS-controlled virulence genes may be affected by serum as a complex medium. In the current study, effects of adult bovi...

background: hereditary angioedema (hae) is a rare autosomal dominant primary immunodeficiency with complement system defect characterized by recurrent episodes of angioedema involving the skin or mucosa of the upper respiratory and gastrointestinal tracts. objective: to characterize the clinical and laboratory data of hereditary angioedema in iran. methods: patients with probable diagnosis of a...

Abstract Introduction: Thalassemia is the most common hereditary anemia in Iran. The aim of this study was to evaluate the humoral immune system and assess the effect of splenectomy on the serum level of immunoglobulins IgG, IgM, and IgA and complement components in patients with major thalassemia. Materials and Methods: This interventional semi-experimental study (before-after) was performed...

Complement was first discovered in 1889 as a bactericidal protein, distinct from heat stable antibodies present in normal serum. Since that time, it has been shown that the complement system is a biochemical cascade, comprised of more than 30 fluid phase and membraneassociated proteins, normally present as inactive forms. The complement system can be activated by different sequential cascades o...

An unexpected role for the classical complement cascade in the elimination of central nervous system (CNS) synapses has recently been discovered. Complement proteins are localized to developing CNS synapses during periods of active synapse elimination and are required for normal brain wiring. The function of complement proteins in the brain appears analogous to their function in the immune syst...

Complement, an important component of the innate immune system, is comprised of about 35 individual proteins. In mammals, activation of complement results in the generation of activated protein fragments that play a role in microbial killing, phagocytosis, inflammatory reactions, immune complex clearance, and antibody production. Fish appear to possess activation pathways similar to those in ma...

Complement is implicated in the pathogenesis of systemic lupus erythematosus (SLE) in several ways and may act as both friend and foe. Homozygous deficiency of any of the proteins of the classical pathway is causally associated with susceptibility to the development of SLE, especially deficiency of the earliest proteins of the activation pathway. However, complement is also implicated in the ef...