Abstract
Apigenin (APG) is a plant-based flavonoid that possesses antioxidants, anti-inflammatory, and modulates P38 MAPK as well as tyrosinase. Hydroquinone (HQ), a phenolic compound was used to induce vitiligo in C57BL/6 mice. The present study was performed to check the therapeutic potential of apigenin in HQ-induced vitiligo via targeting P38 MAPK pathway. In the present study, 41 C57BL/6 mice were divided into six groups containing seven animals per group except normal group. (I) normal group, (II) HQ group, (III) to (IV) APG with (1%, 2.5%, 5%), and (VI) tacrolimus (TAC) group. Topical application of HQ was performed from day 1 to day 20 to, (II), (III) to (IV) APG with (1%, 2.5%, 5%), (VI) tacrolimus (TAC) group, and then APG; tacrolimus (TAC) was applied from day 21 to day 60 after removing the hair. In the case of (I) normal group and (II) HQ group, we smeared them with water for 60 days and HQ for 20 days in their individual group. On day 61 after anesthesia, a part of the target skin was peeled and blood serum was taken to check the level of malondialdehyde, cholinesterase, catalase, tyrosinase, pro-inflammatory cytokines, and expression of P38 MAPK, histology of melanin containing hair follicles and depigmentation evaluation. Applying HQ topically had a noticeable impact on depigmentation, inflammatory indicators, oxidative stress, and lowered tyrosinase activity. Further HQ reduced melanin containing hair follicles and increased expression of P38 MAPK was confirmed by histopathology and immunohistochemistry. Furthermore, application of APG and TAC after day 21 to 60 significantly reduced depigmentation, inflammatory markers, oxidative stress, and increased tyrosinase. Furthermore, APG increased melanin containing hair follicles and decreased expression of non-phosphorylated P38 MAPK, as confirmed by histopathology and immunohistochemistry. Our finding demonstrated that APG significantly prevented HQ-induced vitiligo by acting as an anti-inflammatory, increasing tyrosine, and reducing the expression of non-phosphorylated P38 MAPK.
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Acknowledgements
I would like to express special gratitude to ISF College of Pharmacy for their able support while completion of this article. I would like to thank Professor YK Gupta President AIIMS Bhopal and AIIMS Jammu for his reading and valuable suggestions. I would like to extent my gratitude to all the authors whose papers I had referred.
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Dr. Shamsher Singh provided the original idea, concept of the manuscript and finalize manuscript, Kanupriya Chauhan wrote the manuscript, collected the data, compile the data and prepared the images, Falguni Goel collected data and review paper. The authors declare that all data were generated in-house and that no paper mill was used.
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The experimental protocol was reviewed and approved by the Institutional Animal Ethics Committee (ISFCP/IAEC/CPCSEA/Meeting no.30/2021/ Protocol no. 497), and all the experiments were conducted in compliance with the guidelines of the Indian National Science Academy (INSA) for the use and care of experimental animals.
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Chauhan, K., Goel, F. & Singh, S. Apigenin protects melanocytes and improve tyrosinase activity in a hydroquinone induced vitiligo mouse model targeting P38 MAP kinase signaling: histopathology and immunohistochemistry analysis. Naunyn-Schmiedeberg's Arch Pharmacol (2023). https://doi.org/10.1007/s00210-023-02917-4
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DOI: https://doi.org/10.1007/s00210-023-02917-4