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Anti-Allergic Potential of Cinnamaldehyde via the Inhibitory Effect of Histidine Decarboxylase (HDC) Producing Klebsiella pneumonia
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Anti-Allergic Potential of Cinnamaldehyde via the Inhibitory Effect of Histidine Decarboxylase (HDC) Producing Klebsiella pneumonia
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Journal Article
Anti-Allergic Potential of Cinnamaldehyde via the Inhibitory Effect of Histidine Decarboxylase (HDC) Producing Klebsiella pneumonia
2020
Overview
Allergy is an immunological disorder that develops in response to exposure to an allergen, and histamines mediate these effects via histidine decarboxylase (HDC) activity at the intracellular level. In the present study, we developed a 3D model of Klebsiella pneumoniae histidine decarboxylase (HDC) and analyzed the HDC inhibitory potential of cinnamaldehyde (CA) and subsequent anti-allergic potential using a bacterial and mammalian mast cell model. A computational and in vitro study using K. pneumonia revealed that CA binds to HDC nearby the pyridoxal-5′-phosphate (PLP) binding site and inhibited histamine synthesis in a bacterial model. Further study using a mammalian mast cell model also showed that CA decreased the levels of histamine in the stimulated RBL-2H3 cell line and attenuated the release of β-hexoseaminidase and cell degranulation. In addition, CA treatment also significantly suppressed the levels of pro-inflammatory cytokines TNF-α and IL-6 and the nitric oxide (NO) level in the stimulated mast cells. A gene expression and Western blotting study revealed that CA significantly downregulated the expressions of MAPKp38/ERK and its downstream pro-allergic mediators that are involved in the signaling pathway in mast cell cytokine synthesis. This study further confirms that CA has the potential to attenuate mast cell activation by inhibiting HDC and modifying the process of allergic disorders.
Publisher
MDPI AG,MDPI
Subject
Acrolein - analogs & derivatives
/ allergy
/ Anti-Allergic Agents - pharmacology
/ Antigens
/ Disease
/ Enzymes
/ Histidine Decarboxylase - antagonists & inhibitors
/ Humans
/ Hydrogen
/ Hypersensitivity - drug therapy
/ Hypersensitivity - enzymology
/ Hypersensitivity - immunology
/ Hypersensitivity - pathology
/ Kinases
/ Klebsiella pneumoniae - enzymology
/ Leukemia, Basophilic, Acute - drug therapy
/ Leukemia, Basophilic, Acute - enzymology
/ Leukemia, Basophilic, Acute - immunology
/ Leukemia, Basophilic, Acute - pathology
/ Proteins
