Nutr Res Pract.  2019 Aug;13(4):302-309. 10.4162/nrp.2019.13.4.302.

Carpinus turczaninowii extract modulates arterial inflammatory response: a potential therapeutic use for atherosclerosis

Affiliations
  • 1Biological and Genetic Resources Assessment Division, National Institute of Biological Resources, Incheon 22689, Republic of Korea.
  • 2Department of Food Science and Nutrition, Dong-A University, Busan 49315, Republic of Korea. oykim@dau.ac.kr
  • 3Center for Silver-targeted Biomaterials, Brain Busan 21 Plus Program, Dong-A University, 37 Nakdongdae-ro, 550beon-gil Saha-gu, Busan, 49315, Republic of Korea.
  • 4Institute of Health Insurance and Clinical Research, National Health Insurance Service Ilsan Hospital, Gyeonggi, 10444, Republic of Korea.
  • 5Departments of Anatomy, Chonnam National University Medical School, Gwangju, 61469, Republic of Korea.

Abstract

BACKGROUND
/OBJECTIVES: Vascular inflammation is an important feature in the atherosclerotic process. Recent studies report that leaves and branches of Carpinus turczaninowii (C. turczaninowii) have antioxidant capacity and exert anti-inflammatory effects. However, no study has reported the regulatory effect of C. turczaninowii extract on the arterial inflammatory response. This study therefore investigated modulation of the arterial inflammatory response after exposure to C. turczaninowii extract, using human aortic vascular smooth muscle cells (HAoSMCs). MATERIALS/METHODS: Scavenging activity of free radicals, total phenolic content (TPC), cell viability, mRNA expressions, and secreted levels of cytokines were measured in LPS-stimulated (10 ng/mL) HAoSMCs treated with the C. turczaninowii extract.
RESULTS
C. turczaninowii extract contains high amounts of TPC (225.6 ± 21.0 mg of gallic acid equivalents/g of the extract), as well as exerts time-and dose-dependent increases in strongly scavenged free radicals (average 14.8 ± 1.97 µg/mL IC50 at 40 min). Cell viabilities after exposure to the extracts (1 and 10 µg/mL) were similar to the viability of non-treated cells. Cytokine mRNA expressions were significantly suppressed by the extracts (1 and 10 µg/mL) at 6 hours (h) after exposure. Interleukin-6 secretion was dose-dependently suppressed 2 h after incubation with the extract, at 1–10 µg/mL in non-stimulated cells, and at 5 and 10 µg/mL in LPS-stimulated cells. Similar patterns were also observed at 24 h after incubation with the extract (at 1–10 µg/mL in non-stimulated cells, and at 10 µg/mL in the LPS-stimulated cells). Soluble intracellular vascular adhesion molecules (sICAM-1) secreted from non-stimulated cells and LPS-stimulated cells were similarly suppressed in a dose-dependent manner after 24 h exposure to the extracts, but not after 2 h. In addition, sICAM-1 concentration after 24 h treatment was positively related to IL-6 levels after 2 h and 24 h exposure (r = 0.418, P = 0.003, and r = 0.524, P < 0.001, respectively).
CONCLUSIONS
This study demonstrates that C. turczaninowii modulates the arterial inflammatory response, and indicates the potential to be applied as a therapeutic use for atherosclerosis.

Keyword

Antioxidants; inflammation; cytokines; atherosclerosis; arteries
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