Morphological Features of Cell Death Through Microscopic View

Cells are active components in their environment and constantly adjusting their performance to improve extracellular milieu changing. This approach is reflected their tends of maintaining intracellular homeostasis. When the cells encounter stress or pathologic stimuli, they can undergo a new manner (adaptation) and new steady state for achieving viability and function. If the external stress is exceeded or adaptive capability continues, cell injury develops (۱, ۲). Cells injury is engaged in a process that is reversible or irreversible. Injury is reversible when the stimuli are limited and removed. Only in the persistent stress or pathologic stimuli a reversible phase converted into irreversible phase (point-of-noreturn) and causes cell death(۳). However, cell death is the most important step in embryogenesis, organ development, hemostasis and also the evolution of disease in any organ (۱). The most classifications of mammalian cell death are apoptosis and necrosis. Apoptosis occurs naturally in many situations and helps to eliminate the cells that lost their efficiency. Cells undergoing apoptosis show biochemical events lead to cell changes (morphology) and death (۴, ۵). These features include cell blebbing, shrinkage, chromatin condensation and nuclear fragmentation. Unlike necrosis, which is a pathologic cell death, apoptotic cells release cell fragment called apoptotic bodies (۱, ۶). This image was taken with light microscopes (Nikon, TE۲۰۰۰ inverted microscopes), peripheral blood monocytes during ۱۳ days culture initially change into macrophage-like cells and then due to lack of nutrition materials and a high level of toxic substance, to undergo cell death. The morphological changes as mention above (Fig۱ legend) approved apoptosis process and cell death. However, sometimes the end stage of apoptosis accompanied by necrosis and it is not possible to distinguish them from the microscopic view.

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