The Role of Tissue-Fixed Macrophages in Apoptosis in the Developing Kidney

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Abstract
Programmed cell death (PCD) and cell type involving dying cells in the developing mouse and human fetal kidneys were investigated using the modified TdT-mediated dUTP-biotin nick end-labeling (TUNEL) method in combination with immunohistochemistry. We identified many TUNEL-positive apoptotic cells mainly in the nephrogenic region in the developing mouse and human fetal kidneys. Tissue-fixed macrophages were widely distributed throughout the developing mouse and human fetal kidneys, including the nephrogenic zone. Most of the apoptotic cells in the nephrogenic zone were phagocytosed by tissue-fixed macrophages, suggesting that tissue-fixed macrophages play an important role in the process of PCD in the developing mouse kidney and human fetal kidney.

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