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Published on: November 21, 2025
PCB77 Inducing Renal Tubular Cell Apoptosis
1Division of Nephrology, Renmin Hospital of Wuhan University , Wuhan, Hubei , People's Republic of China .
Abstract:
PCBs are a family of persistent environmental toxicants with a wide spectrum of toxic features, such as neurotoxic, hepatoxicity, immunotoxicity, endocrine disruption effects, and oncogenic effects. The kidney is the most important organ involved in the elimination of toxins and drugs. To date, little has been done to investigate the potential influence of nephrotoxicity of 3,3',4,4'- tetrachlorobiphenyl (PCB77). By assessing cell viability and apoptotic cell death in renal tubular epithelial (NRK-52E) cells cultures, we found that PCB77 could decrease cellular viability at least at 30 μM concentration after 3 h exposure. PCB77 was demonstrated to promote DNA breakage resulting in apoptosis. Moreover, apoptotic subcellular morphological changes administration of PCB77 was observed using transmission electron microscopy. Appearance swelling of mitochondria, endoplasmic reticulum dilation and chromatin agglutinate, and other apoptosis cells morphological characteristics could be visible. Due to increased PCB77 concentration, cells viability was decreased. Collectively, our findings identified the morphological mechanism that PCB77-induced nephrotoxicity via promoting renal tubular epithelial cells apoptosis. It is suggested that using and production of PCB77 should be carefully managed to reduce public health risks.
Insights
Polychlorinated biphenyls (PCBs), specifically PCB77, induce kidney toxicity by promoting apoptosis in renal tubular epithelial cells. This study reveals the cellular mechanisms behind PCB77-induced nephrotoxicity, highlighting risks associated with its production and use.
Area of Science:
- Environmental Toxicology
- Nephrology
- Cell Biology
Background:
- Polychlorinated biphenyls (PCBs) are persistent environmental toxicants with diverse toxic effects, including neurotoxicity, hepatotoxicity, immunotoxicity, endocrine disruption, and oncogenesis.
- The kidney plays a crucial role in eliminating toxins, yet the specific nephrotoxic potential of 3,3',4,4'-tetrachlorobiphenyl (PCB77) remains under-investigated.
Purpose of the Study:
- To investigate the nephrotoxicity of PCB77 on renal tubular epithelial cells (NRK-52E).
- To elucidate the cellular and morphological mechanisms underlying PCB77-induced kidney damage.
Main Methods:
- Exposure of NRK-52E cells to varying concentrations of PCB77.
- Assessment of cell viability using standard assays.
- Evaluation of apoptotic cell death and DNA damage.
- Transmission electron microscopy to observe subcellular morphological changes.
Main Results:
- PCB77 significantly decreased renal tubular epithelial cell viability at concentrations of 30 μM and above after 3 hours of exposure.
- PCB77 induced DNA breakage, leading to apoptosis in the exposed cells.
- Transmission electron microscopy revealed characteristic apoptotic morphological changes, including mitochondrial swelling, endoplasmic reticulum dilation, and chromatin agglutination.
Conclusions:
- PCB77 induces nephrotoxicity by promoting apoptosis in renal tubular epithelial cells.
- The findings identify a specific morphological mechanism for PCB77-induced kidney damage.
- Careful management of PCB77 production and use is recommended to mitigate public health risks.
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Proximal Convoluted Tubule (PCT):
The PCT is the initial segment of the renal tubule, extending from the Bowman's capsule that encloses the glomerulus. Its convoluted structure and microvilli-lined cells increase the surface area for reabsorption. The PCT reabsorbs glucose, amino acids, sodium, and water from the filtrate, ensuring essential...