Related Experiment Video
Updated: Feb 11, 2026
High-Throughput In Vitro Assay using Patient-Derived Tumor Organoids
Published on: June 14, 2021
In Vitro Anti-tumor Activity of Azulene Amide Derivatives
Toshiki Wada1, Ryota Maruyama1, Yuta Irie1
1Faculty of Science, Josai University, Saitama, Japan.
Background/Aim:
There exist few research articles regarding the anticancer activity of azulene-related compounds. We investigated here the relative cytotoxicity of 10 azulene amide derivatives against cancer and normal cells.
Materials And Methods:
Cytotoxicity against four human oral squamous cell carcinoma (OSCC) cell lines and three human oral normal cells (gingival fibroblasts, periodontal ligament fibroblasts and pulp cells) was determined by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetra-zolium bromide method. Antitumor activity was evaluated by tumor-specificity (TS) (ratio of mean 50% cytotoxic concentration (CC50) against normal cells to that against OSCC cell lines) and potency-selectivity expression (PSE) (ratio of TS to CC50 against tumor cells). Apoptosis-inducing activity was evaluated by cleavage of poly ADP-ribose polymerase and caspase-3 with western blot analysis.
Results:
N-Propylguaiazulenecarboxamide [1] showed the highest TS and PSE values, compared to that of doxorubicin, and induced apoptosis in two OSCC cell lines. QSAR analysis demonstrated that their tumor-specificity of azulene amide derivatives was correlated with hydrophobicity and molecular shape.
Conclusion:
Compound [1] can be considered as a lead compound for manufacturing new anticancer drug candidates.
Insights
N-Propylguaiazulenecarboxamide, an azulene derivative, demonstrated significant anticancer potential by selectively targeting oral cancer cells and inducing apoptosis. This compound shows promise as a basis for novel anticancer drug development.
Area of Science:
- Medicinal Chemistry
- Pharmacology
- Cancer Research
Background:
- Limited research exists on the anticancer properties of azulene derivatives.
- This study explores the cytotoxicity of novel azulene amide compounds.
Purpose of the Study:
- To evaluate the relative cytotoxicity of 10 azulene amide derivatives against cancer and normal oral cells.
- To identify potential anticancer drug candidates from this chemical class.
Main Methods:
- Cytotoxicity assessed using the MTT assay on human oral squamous cell carcinoma (OSCC) and normal oral cell lines.
- Antitumor activity quantified by tumor-specificity (TS) and potency-selectivity expression (PSE).
- Apoptosis induction evaluated via Western blot analysis for PARP and caspase-3 cleavage.
Main Results:
- N-Propylguaiazulenecarboxamide [1] exhibited superior TS and PSE compared to doxorubicin.
- Compound [1] effectively induced apoptosis in two OSCC cell lines.
- Quantitative Structure-Activity Relationship (QSAR) analysis indicated hydrophobicity and molecular shape influence tumor-specificity.
Conclusions:
- N-Propylguaiazulenecarboxamide [1] is a promising lead compound for developing new anticancer therapeutics.
- Azulene amide derivatives show potential for targeted cancer therapy, particularly for oral cancers.
More Related Videos
11:48Isolation Protocol of Mouse Monocyte-derived Dendritic Cells and Their Subsequent In Vitro Activation with Tumor Immune Complexes
Published on: May 31, 2018
09:29Development and Maintenance of a Preclinical Patient Derived Tumor Xenograft Model for the Investigation of Novel Anti-Cancer Therapies
Published on: September 30, 2016
Related Concept Videos
01:11Nomenclature of Carboxylic Acid Derivatives: Amides and Nitriles
The IUPAC and common names of amides are derived from the parent carboxylic acid, by replacing the suffix “oic acid” and “ic acid,” respectively, with “amide.” In the following example, the IUPAC name ethanamide is derived from ethanoic acid, and the common name, acetamide, is obtained from acetic acid.
01:29Preparation of Amides
The DCC-promoted synthesis of amides begins with the protonation of DCC by carboxylic acid. The protonation makes it a better acceptor. Next, the addition of carboxylate to the protonated carbodiimide gives a reactive acylating agent.
Subsequently, the amine acts as a nucleophile that attacks the acylating agent to form a tetrahedral intermediate. In the...
01:28Amides to Carboxylic Acids: Hydrolysis
Acid-catalyzed hydrolysis:
Hydrolysis of amides under acidic conditions yields carboxylic acids. Since the reaction occurs slowly, hydrolysis requires the conditions of heat.
The mechanism begins with the protonation of the carbonyl oxygen by the acid catalyst. The protonation makes the amide carbonyl carbon more...
01:19Amines to Amides: Acylation of Amines
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary...
01:07Acid Halides to Amides: Aminolysis
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
01:20Amides to Amines: LiAlH4 Reduction
Amide reduction requires two equivalents of the reducing agent, acting as a source of hydride ions. As shown in the figure, the reaction is initiated with a nucleophilic attack by the hydride ion at the carbonyl carbon to form a tetrahedral intermediate.