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The Effect of a Human Antibacterial Neuropeptide SL-21 on the Expression of Pro-inflammatory Factors in Airway Epithelial Cells

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Abstract

Antimicrobial peptides are evolutionary components of the immune system generated in response to microbial infections. Human catestatin CgA352–372 (SL-21) is an endogenous neuropeptide with multiple biological functions. The present study aimed to further evaluate the immunomodulatory role of SL-21 in innate immunity of lung cells and investigate its impact on the expression level of pro-inflammatory factors. SL-21 neuropeptide, generated from the C-terminus of chromogranin A, was first chemically synthesized by solid-phase method and purified using C8 semi-preparative RP-HPLC. According to the results of MTT assay, SL-21 showed no significant cytotoxicity effect on human lung epithelial adenocarcinoma cell line (A549) and human fetal lung fibroblast primary cells even at high concentration (<12 % suppression of the cell growth). Furthermore, SL-21 decreased the expression level of pro-inflammatory factors including interleukine-1β (IL-1β), IL-6, IL-8, and tumor necrosis factor-α in a dose- and time-dependent manner. The results suggest that SL-21 antimicrobial neuropeptide interferes with cytokine network evolving during inflammatory processes of the respiratory tract. Since inflammation has been implicated as one of the main causative factors in human diseases, our findings suggest that potent SL-21 anti-inflammatory properties could be of great significance in the treatment of inflammatory disorders.

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Acknowledgments

This work was supported by Ferdowsi University of Mashhad, and Zabol University of Medical Sciences, therefore is greatly appreciated by the authors. We would like also to thank from Khadije Rezaie-Keikhaie, Mohammad Reza Abbaszadegan and Mehran Gholamin for reading the manuscript.

Conflict of interest

Kolsoum Rezaie-Kahkhaie, Shirin Emtenani, Shamsi Emtenani, Doosti, Mohammad, and Ahmad Asoodeh declare that they have no conflict of interest.

Human and Animal Rights and Informed Consent

This article does not contain any studies with human or animal subjects performed by any of the authors.

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Authors and Affiliations

  1. Medicinal Plants Research Center, Zabol University of Medical Sciences (ZBUMS), Zabol, Iran

    Kolsoum Rezaie-Kahkhaie

  2. Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran

    Shirin Emtenani, Shamsi Emtenani & Ahmad Asoodeh

  3. Department of Animal Science, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran

    Mohammad Doosti

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  1. Kolsoum Rezaie-Kahkhaie
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  2. Shirin Emtenani
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  3. Shamsi Emtenani
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  4. Mohammad Doosti
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  5. Ahmad Asoodeh
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Corresponding author

Correspondence to Ahmad Asoodeh.

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Rezaie-Kahkhaie, K., Emtenani, S., Emtenani, S. et al. The Effect of a Human Antibacterial Neuropeptide SL-21 on the Expression of Pro-inflammatory Factors in Airway Epithelial Cells. Int J Pept Res Ther 21, 403–409 (2015). https://doi.org/10.1007/s10989-015-9469-5

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  • DOI: https://doi.org/10.1007/s10989-015-9469-5

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