Substituted benzylamino-2'-deoxyadenosine a modified nucleoside with radiosensitizing properties.
Magdalena Datta1, Adrian Szczyrba1, Anna Czaja1
1Laboratory of Biological Sensitizers, Department of Physical Chemistry, Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308, Gdańsk, Poland.
Scientific Reports
|May 20, 2025
Summary
This study shows that a new nucleoside, 8-(4-Trifluoromethoxy)benzylamino-2'-deoxyadenosine, enhances tumor cell sensitivity to X-rays without causing cytotoxicity. It affects the cell cycle, offering a potential new radiosensitizing agent.
Area of Science:
- Radiochemistry
- Molecular Biology
- Cancer Research
Background:
- Novel nucleoside analogs are explored for cancer therapy.
- Understanding radiosensitizers can improve radiation oncology outcomes.
Purpose of the Study:
- To evaluate the radiosensitizing potential of 8-(4-Trifluoromethoxy)benzylamino-2 ahydroadenosine (dA-NHbenzylOCF3) on tumor cells.
- To investigate the mechanism of action of this novel compound.
Main Methods:
- Computational molecular modeling to predict electron attachment.
- Stationary radiolysis and LC-MS analysis to confirm radical formation.
- In vitro cytotoxicity, clonogenic assays, and flow cytometry on cancer cell lines (PC3, MCF-7) and HaCaT cells.
Main Results:
- Dissociative electron attachment (DEA) to dA-NHbenzylOCF3 was computationally predicted and experimentally confirmed.
- dA-NHbenzylOCF3 demonstrated no significant cytotoxicity to PC3, MCF-7, and HaCaT cell lines.
- Statistically significant radiosensitization of PC3 and MCF-7 cells to X-rays was observed.
- Flow cytometry indicated dA-NHbenzylOCF3 influences the cell cycle, not directly DNA double-strand breaks.
- The compound localizes in the cytoplasm and nucleus but is not phosphorylated or integrated into DNA.
Conclusions:
- 8-(4-Trifluoromethoxy)benzylamino-2 ahydroadenosine is a non-cytotoxic radiosensitizer.
- Its mechanism involves cell cycle modulation rather than direct DNA damage enhancement.
- This compound shows promise as a radiosensitizing agent in cancer treatment.
Keywords:
Cell cycleClonogenic assayDissociative electron attachmentMTT testRadiosensitizing nucleosidesMore Related Videos
Related Concept Videos
01:14Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1
2.1K
Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo,...
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo,...
2.1K
01:11Nucleophilic Aromatic Substitution: Elimination–Addition
4.0K
Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
4.0K
01:20Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions
1.8K
Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
1.8K
01:19Diazonium Group Substitution: –OH and –H
2.7K
Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
2.7K
01:20Electrophilic Aromatic Substitution: Nitration of Benzene
5.5K
The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.
5.5K
01:13meta-Directing Deactivators: –NO2, –CN, –CHO, –CO2R, –COR, –CO2H
5.3K
All meta-directing substituents are deactivating groups. These substituents withdraw electrons from the aromatic ring, making the ring less reactive toward electrophilic substitution. For example, the nitration of nitrobenzene is 100,000 times slower than that of benzene because of the deactivating effect of the nitro group. The first step in an electrophilic aromatic substitution is the addition of an electrophile to form a resonance-stabilized carbocation. The energy diagrams for...
5.3K