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These proteins are taken up by antigen-presenting cells (APC) and degraded into small peptides. The peptides are inserted into a groove on HLA proteins that are part of major histocompatibility complexes (i.e. MHC) and presented to T-cell receptors (TCR) on nearby cytotoxic T cells (i.e. CD8 + T cells) or T helper cells (i.e. CD4 + T cells). T ...
Smoking – Smoking causes a delay in the speed of wound repair notably in the proliferative and inflammatory phases. It also increases the likelihood of certain complications such as wound rupture, wound and flap necrosis, decrease in wound tensile strength and infection. [64] Passive smoking also impairs a proper wound healing process. [66]
Coagulative necrosis is a type of accidental cell death typically caused by ischemia or infarction. In coagulative necrosis, the architectures of dead tissue are preserved for at least a couple of days. [1] It is believed that the injury denatures structural proteins as well as lysosomal enzymes, thus blocking the proteolysis of the damaged cells.
Low oxygen conditions, such as those common in blind mole rats' burrows, usually cause cells to undergo apoptosis. In adaptation to higher tendency of cell death, blind mole rats evolved a mutation in the tumor suppressor protein p53 (which is also used in humans) to prevent cells from undergoing apoptosis. Human cancer patients have similar ...
Loss of the skin leaves patients vulnerable to infections from fungi and bacteria, and can result in sepsis, the leading cause of death in the disease. [13] Death is caused either by infection or by respiratory distress which is either due to pneumonia or damage to the linings of the airway. Microscopic analysis of tissue (especially the degree ...
Protein hydrolysis is accelerated as the anaerobic bacteria of the digestive tract consume, digest, and excrete the cellular proteins of the body. Putrefaction in human hands after several days of one of the Oba Chandler victims underwater in Florida, United States. The bacterial digestion of the cellular proteins weakens the tissues of the body.
Protein DAMPs include intracellular proteins, such as heat-shock proteins [11] or HMGB1, [12] and materials derived from the extracellular matrix that are generated following tissue injury, such as hyaluronan fragments. [13] Non-protein DAMPs include ATP, [14] [15] uric acid, [16] heparin sulfate and DNA. [17]
Wound dehiscence is a surgical complication in which a wound ruptures along a surgical incision. Risk factors include age, collagen disorder such as Ehlers–Danlos syndrome , diabetes , obesity , poor knotting or grabbing of stitches , and trauma to the wound after surgery.