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Alterations in Apoptotic Cell Populations, Protein Markers, and Gene Expression Patterns in Rats with Sulfur
1Department of Respiration, The 80th Group Army Hospital of People's Liberation Army, Weifang, China. LTT2008L@163.com.
Abstract:
Sulfur mustard (SM) is a potent chemical warfare agent that causes severe cutaneous, ocular, and pulmonary injuries, with respiratory tract damage being the most life-threatening. Despite its well-documented toxicity, the cellular mechanisms driving SM-induced apoptosis remain poorly understood. This study seeks to elucidate the apoptotic pathways involved in SM-induced pulmonary injury using a rat model. We induced acute lung injury through two delivery methods: intraperitoneal injection (8 mg/kg) and intratracheal instillation (2 mg/kg) of SM, with both doses representing 1 LD50. We assessed apoptosis-related proteins and gene expression through TUNEL staining, immunohistochemistry, and quantitative real-time PCR analyses. Intraperitoneal administration of SM resulted in significantly elevated expression of apoptotic markers including annexin A1, annexin A2, cytochrome C, caspase-12, and JNK3, in alveolar epithelial cells compared to intratracheal delivery. Both TUNEL assays and immunohistochemical staining confirmed these findings. These results indicate that intraperitoneal SM exposure triggers more severe apoptotic responses in alveolar epithelial cells than intratracheal exposure at equivalent doses. These findings demonstrate that intraperitoneal models can effectively identify apoptosis-related molecular targets suitable for therapeutic development.
Insights
Sulfur mustard (SM) exposure causes lung injury via apoptosis. Intraperitoneal SM injection induced more severe apoptotic responses in lung cells than intratracheal instillation, identifying potential therapeutic targets.
Area of Science:
- Toxicology
- Cellular Biology
- Pulmonary Medicine
Background:
- Sulfur mustard (SM) is a chemical warfare agent causing severe injuries, particularly life-threatening respiratory damage.
- The precise cellular mechanisms of SM-induced apoptosis in the lungs are not fully understood.
- Identifying these mechanisms is crucial for developing effective countermeasures.
Purpose of the Study:
- To investigate the apoptotic pathways activated by SM in the lung.
- To compare the severity of SM-induced apoptosis via different exposure routes (intraperitoneal vs. intratracheal).
- To identify potential molecular targets for therapeutic intervention.
Main Methods:
- Induction of acute lung injury in a rat model using intraperitoneal injection and intratracheal instillation of SM (1 LD50 dose).
- Assessment of apoptosis using TUNEL staining, immunohistochemistry, and quantitative real-time PCR.
- Analysis of apoptosis-related proteins and gene expression, including annexin A1, annexin A2, cytochrome C, caspase-12, and JNK3.
Main Results:
- Intraperitoneal SM administration significantly elevated apoptotic markers (annexin A1, annexin A2, cytochrome C, caspase-12, JNK3) in alveolar epithelial cells.
- These increases were more pronounced compared to intratracheal SM instillation at equivalent doses.
- TUNEL assays and immunohistochemistry confirmed heightened apoptosis with intraperitoneal exposure.
Conclusions:
- Intraperitoneal exposure to sulfur mustard triggers a more severe apoptotic response in alveolar epithelial cells than intratracheal exposure.
- The intraperitoneal model effectively identifies apoptosis-related molecular targets for potential therapeutic development against SM-induced lung injury.
