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Polyamine metabolism in chronic lymphocytic leukemia
Z N Canellakis1, C A Portlock, P K Bondy
1West Haven Veterans Administration Medical Center, CT 06516.
Insights
Diacetyldiaminohexane (HMBA) inhibits chronic lymphocytic leukemia (CLL) lymphocyte proliferation. HMBA also alters polyamine metabolism and protein modification in CLL cells.
Area of Science:
- Biochemistry
- Immunology
- Oncology
Background:
- Polyamines significantly impact lymphocyte proliferation and function.
- Chronic lymphocytic leukemia (CLL) is a B-cell malignancy characterized by lymphocyte accumulation.
Purpose of the Study:
- To investigate the effect of diacetyldiaminohexane (HMBA) on CLL lymphocyte proliferation.
- To explore polyamine metabolism and protein modification in HMBA-treated CLL lymphocytes.
Main Methods:
- Cultured lymphocytes from CLL patients were treated with HMBA.
- Analysis of lymphocyte proliferation, polyamine uptake, and polyamine metabolite conversion was performed.
Main Results:
- HMBA abrogated the proliferative response of cultured CLL lymphocytes.
- HMBA exposure led to decreased uptake of exogenous spermidine in CLL lymphocytes.
- Significant conversion of spermidine to N1-acetylspermidine was observed in CLL lymphocytes.
- Post-translational modification of proteins by polyamines in CLL lymphocytes was demonstrated.
Conclusions:
- HMBA exhibits anti-proliferative effects on CLL lymphocytes.
- HMBA influences polyamine homeostasis and metabolism in CLL cells.
- These findings suggest HMBA as a potential therapeutic agent for CLL.
Abstract:
We have previously shown that polyamines have profound effects on lymphocyte proliferation and function. We now report that the proliferative response of cultured lymphocytes from patients with chronic lymphocytic leukemia is abrogated by the addition of diacetyldiaminohexane (HMBA), the 6-carbon analogue of diacetylputrescine. In addition, this study demonstrates the post-translational modification of proteins by polyamines in CLL-lymphocytes, a decrease in the uptake of exogenous spermidine by CLL-lymphocytes which have been exposed to HMBA, and the significant conversion of spermidine to N1-acetylspermidine in CLL-lymphocytes.