Related Experiment Videos
Structurally different anthracyclines provoke different effects on cell cycle and tumor B cell differentiation
J L Teillaud1, N Gruel, J Moncuit
1Laboratoire d'Immunologie Cellulaire et Clinique, Unité INSERM 255, Institut Curie, Paris, France. teillaud@curie.fr
Biomedicine & Pharmacotherapy = Biomedecine & Pharmacotherapie
|October 2, 1998
Summary
Anthracyclines like doxorubicin can stimulate immunoglobulin (IgG) production in B cells. The drug
Area of Science:
- Immunology
- Cell Biology
- Pharmacology
Background:
- Doxorubicin (DOX) has previously shown a stimulatory effect on immunoglobulin (IgG) synthesis in hybridoma cells.
- Anthracyclines are a class of chemotherapy drugs with potential immunomodulatory effects.
- The structural differences in amino sugars of anthracyclines may influence their biological activity.
Purpose of the Study:
- To investigate whether the stimulatory effect on IgG synthesis is a general property of anthracyclines.
- To compare the effects of three anthracycline analogs—doxorubicin (DOX), pirarubicin (THP-DOX), and aclarubicin (ACR)—on IgG synthesis and cell cycle progression.
- To explore the relationship between anthracycline structure, cell cycle arrest, and IgG stimulation.
Main Methods:
- Hybridoma B cells (UN2) were treated with subtoxic doses of DOX, THP-DOX, and ACR.
- Immunoglobulin (IgG) secretion, heavy (H) and light (L) chain synthesis, and corresponding mRNA levels were measured.
- Cell cycle analysis was performed using flow cytometry.
- Drug localization within cells was determined using scanning confocal microscopy.
Main Results:
- DOX and THP-DOX (with unmethylated amino sugars) significantly increased IgG secretion, H and L chain synthesis, and mRNA levels.
- These two drugs also arrested hybridoma cells in the G2/M phase of the cell cycle.
- ACR (with a methylated amino sugar) induced G1 phase arrest without increasing IgG synthesis.
- All three drugs were detected in both the nucleus and cytoplasm of treated cells.
Conclusions:
- The structure of anthracyclines, specifically the methylation state of their amino sugars, influences their effect on IgG synthesis and cell cycle progression.
- Anthracyclines with unmethylated amino sugars (DOX, THP-DOX) stimulate IgG production and cause G2/M arrest.
- Anthracyclines with methylated amino sugars (ACR) cause G1 arrest without IgG stimulation.
- A correlation is suggested between cell cycle blockade, IgG stimulation, and anthracycline chemical structure.