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Effects of Simulated Heat Waves with Strong Sudden Cooling Weather on ApoE Knockout Mice

Author

Listed:
  • Shuyu Zhang

    (Hebei Provincial Meteorological Bureau, 178 Tiyu South Street, Shijiazhuang 050021, China)

  • Zhengzhong Kuang

    (School of Applied Meteorology, Nanjing University of Information Sciences and Technology, 219 Ningliu Road, Nanjing 210044, China)

  • Xiakun Zhang

    (National Meteorological Centre, 46 Zhongguancun South Street, Beijing 100081, China)

Abstract

This study analyzes the mechanism of influence of heat waves with strong sudden cooling on cardiovascular diseases (CVD) in ApoE−/− mice. The process of heat waves with strong sudden cooling was simulated with a TEM1880 meteorological-environment simulation chamber according to the data obtained at 5 a.m. of 19 June 2006 to 11 p.m. of 22 June 2006. Forty-eight ApoE−/− mice were divided into six blocks based on their weight. Two mice from each block were randomly assigned to control, heat wave, temperature drop, and rewarming temperature groups. The experimental groups were transferred into the climate simulator chamber for exposure to the simulated heat wave process with strong sudden temperature drop. After 55, 59, and 75 h of exposure, the experimental groups were successively removed from the chamber to monitor physiological indicators. Blood samples were collected by decollation, and the hearts were harvested in all groups. The levels of heat stress factors (HSP60, SOD, TNF, sICAM-1, HIF-1α), cold stress factors (NE, EPI), vasoconstrictor factors (ANGII, ET-1, NO), and four items of blood lipid (TC, TG, HDL-C, and LDL-C) were measured in each ApoE−/− mouse. Results showed that the heat waves increased the levels of heat stress factors except SOD decreased, and decreased the levels of vasoconstrictor factors and blood lipid factors except TC increased. The strong sudden temperature drop in the heat wave process increased the levels of cold stress factors, vasoconstrictor factors and four blood lipid items (except the level of HDL-C which decreased) and decreased the levels of heat stress factors (except the level of SOD which increased). The analysis showed that heat waves could enhance atherosclerosis of ApoE−/− mice. The strong sudden temperature drop during the heat wave process increased the plasma concentrations of NE and ANGII, which indicates SNS activation, and resulted in increased blood pressure. NE and ANGII are vasoconstrictors involved in systemic vasoconstriction especially in the superficial areas of the body and conducive to increased blood pressure. The increase in the blood lipid levels of TG, LDL-C, TC, and LDL-C/HDL-C further aggravated CVD. This paper explored the influence mechanism of the heat waves with sudden cooling on CVD in ApoE−/− mice.

Suggested Citation

  • Shuyu Zhang & Zhengzhong Kuang & Xiakun Zhang, 2015. "Effects of Simulated Heat Waves with Strong Sudden Cooling Weather on ApoE Knockout Mice," IJERPH, MDPI, vol. 12(6), pages 1-15, May.
  • Handle: RePEc:gam:jijerp:v:12:y:2015:i:6:p:5743-5757:d:50128
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    References listed on IDEAS

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    1. Xiakun Zhang & Shuyu Zhang & Chunling Wang & Baojian Wang & Pinwen Guo, 2014. "Effects of Moderate Strength Cold Air Exposure on Blood Pressure and Biochemical Indicators among Cardiovascular and Cerebrovascular Patients," IJERPH, MDPI, vol. 11(3), pages 1-16, February.
    2. Bin Luo & Shuyu Zhang & Shoucun Ma & Ji Zhou & Baojian Wang, 2012. "Artificial Cold Air Increases the Cardiovascular Risks in Spontaneously Hypertensive Rats," IJERPH, MDPI, vol. 9(9), pages 1-12, September.
    3. Bin Luo & Shuyu Zhang & Shoucun Ma & Ji Zhou & Baojian Wang, 2012. "Effects of Cold Air on Cardiovascular Disease Risk Factors in Rat," IJERPH, MDPI, vol. 9(7), pages 1-14, June.
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    Cited by:

    1. Jakub Lickiewicz & Katarzyna Piotrowicz & Patricia Paulsen Hughes & Marta Makara-Studzińska, 2020. "Weather and Aggressive Behavior among Patients in Psychiatric Hospitals—An Exploratory Study," IJERPH, MDPI, vol. 17(23), pages 1-12, December.

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    2. Bin Luo & Shuyu Zhang & Shoucun Ma & Ji Zhou & Baojian Wang, 2012. "Artificial Cold Air Increases the Cardiovascular Risks in Spontaneously Hypertensive Rats," IJERPH, MDPI, vol. 9(9), pages 1-12, September.

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