A biphasic effect of tumor necrosis factor-α on RPMI 2650 cell line in vitro

Area of Science:

• Immunology
• Cell Biology
• Respiratory Medicine

Background:

• Tumor necrosis factor-alpha (TNFα) is a key proinflammatory cytokine implicated in upper respiratory tract inflammatory diseases.
• Elevated TNFα levels are observed in various inflammatory conditions affecting the nasal passages.

Purpose of the Study:

• To investigate the dose- and time-dependent effects of TNFα on the RPMI 2650 nasal epithelium cell line.
• To elucidate the molecular mechanisms underlying TNFα-induced changes in nasal epithelial cells.

Main Methods:

• Exposure of RPMI 2650 cells to varying concentrations of TNFα (1-100 ng/ml) for different durations (6-48 h).
• Assessment of NF-κB activation, apoptosis, cell viability, and levels of intercellular contact proteins (E-cadherin, ZO-1).

Main Results:

• Short-term (6 h) TNFα exposure activated NF-κB and increased E-cadherin and ZO-1 levels without affecting cell viability.
• Long-term (24-48 h) TNFα exposure increased pro-IL-1β, induced apoptosis, decreased cell viability, and reduced intercellular contact proteins.
• Prolonged TNFα exposure led to a decrease in intercellular contact density, potentially increasing cell layer permeability.

Conclusions:

• Short-term TNFα exposure may have a protective role by enhancing intercellular contacts in the nasal epithelium.
• Prolonged TNFα exposure induces detrimental effects, including apoptosis and compromised barrier function, contributing to disease pathogenesis.