Abstract
Ionic interactions are essential for the biological functions of the polyamines spermidine and spermine in mammalian physiology. Here, we describe a simple gram scale method to prepare 1,12-diamino-3,6,9-triazadodecane (SpmTrien), an isosteric charge-deficient spermine analogue. The protonation sites of SpmTrien were determined at pH range of 2.2–11.0 using two-dimensional 1H-15N NMR spectroscopy, which proved to be more feasible than conventional methods. The macroscopic pK a values of SpmTrien (3.3, 6.3, 8.5, 9.5 and 10.3) are significantly lower than those of 1,12-diamino-4,9-diazadodecane (spermine). The effects of SpmTrien and its parent molecule, 1,8-diamino-3,6-diazaoctane (Trien), on cell growth and polyamine metabolism were investigated in DU145 prostate carcinoma cells. SpmTrien downregulated the biosynthetic enzymes ornithine decarboxylase (ODC) and S-adenosyl-l-methionine decarboxylase and decreased intracellular polyamine levels, whereas the effects of Trien alone were minor. Interestingly, both SpmTrien and Trien were able to partially overcome growth arrest induced by an ODC inhibitor, α-difluoromethylornithine, indicating that they are able to mimic some functions of the natural polyamines. Thus, SpmTrien is a novel tool to influence polyamine interaction sites at the molecular level and offers a new means to study the contribution of the protonation of spermine amino group(s) in the regulation of polyamine-dependent biological processes.
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Abbreviations
- AdoMetDC:
-
S-adenosyl-L-methionine decarboxylase
- AG:
-
Aminoguanidine
- DENSpm:
-
N1,N11-diethylnorspermine
- DFMO:
-
α-Difluoromethylornithine (2,5-diamino-2-(difluoromethyl)pentanoic acid)
- HMBC:
-
Heteronuclear multiple bond correlation
- HSQC:
-
Heteronuclear single quantum correlation
- ODC:
-
Ornithine decarboxylase
- Pu:
-
Putrescine (1,4-diaminobutane)
- Spm:
-
Spermine (1,12-diamino-4,9-diazadodecane)
- SpmTrien:
-
(1,12-Diamino-3,6,9-triazadodecane)
- Spd:
-
Spermidine (1,8-diamino-4-azaoctane)
- SSAT:
-
Spermidine/spermine N 1-acetyltransferase
- Trien:
-
Triethylenetetramine (1,8-diamino-3,6-diazaoctane)
- TSP:
-
Sodium 3-trimethylsilyl[2,2,3,3-d 4]propionate
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Acknowledgments
We would like to thank Ms. Maritta Salminkoski, Ms. Tuula Reponen, Ms. Anne Karppinen, Ms. Arja Korhonen for their skilful technical assistance and Ph.D. Elina Jarho for her assistance with the automatic titrator. This work was supported by Academy of Finland (project nos. 124185 and 128702), Russian Foundation for Basic Research (project no. 09-04-01272), and the program Molecular and Cell Biology of the Presidium of the Russian Academy of Sciences.
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Weisell, J., Hyvönen, M.T., Vepsäläinen, J. et al. Novel isosteric charge-deficient spermine analogue—1,12-diamino-3,6,9-triazadodecane: synthesis, pK a measurement and biological activity. Amino Acids 38, 501–507 (2010). https://doi.org/10.1007/s00726-009-0409-6
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DOI: https://doi.org/10.1007/s00726-009-0409-6