Stimulation of lipolysis by pycnogenol

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  • SHORT COMMUNICATION

    Stimulation of Lipolysis by Pycnogenol

    Noboru HasegawaDepartment of Food and Nutrition, Nagoya Bunri College, Nagoya, Japan

    We studied the influence of pycnogenol on the lipolysis of 3T3 L1 cells after differentiation. When pycno-genol or epinephrine was exposed to mature adipocytes, the smaller (less than 20 mm2) intracytoplasmiclipid droplets selectively disappeared. These data suggest that pycnogenol stimulates lipolysis. Copyright# 1999 John Wiley & Sons, Ltd.Keywords: 3T3 L1 cell; pycnogenol; insulin; epinephrine; lipogenesis; lipolysis.

    INTRODUCTION

    Pycnogenol is a mixture of bioflavonoids with antiox-idative activity and is isolated from the bark of the Frenchmarine pine, Pinus pinaster (Masquelier et al., 1979). Itcontains a mixture of water soluble procyanidins, taxi-folin and phenolcarbonic acids. It controls the immunesystem (Cheshier et al., 1996), protects vascularendothelial cells (Rong et al., 19945) and reducesoedema or inflammation (Kuttan et al., 1981; Tixer et al.,1984) by radical-scavenging activity. However, nothingis known about its effects on obesity.

    3T3 L1-preadipocytes are converted to adipocytes byinsulin (Green and Kehinde, 1975), and the intracellulardroplets of adipocytes are broken down by norepine-phrine (Chernick et al., 1986). In this study, pycnogenolwas tested for its lipolytic effects on the dispersion oflipid droplets by measuring the area of the droplets.

    MATERIALS AND METHODS

    Chemicals. Pycnogenol was provided by Tradepia Co.(Kasukabe, Saitama, Japan). Dulbeccos modifiedEagles medium (DMEM) and DMEM:Ham F-12 (1:1)were purchased from Dainihon Pharmaceutical Co.(Tokyo, Japan). Epinephrine was from Daiichi Pharma-ceutical Co. (Tokyo, Japan). Bovine insulin, calf serum(CS) and fetal calf serum (FCS) were from JRHBiosciences (Lenexa, KS).Cell culture. 3T3 L1-preadipocytes (American TypeCulture Collection, Rockville, MD) were grown inDMEM containing 10% CS, 100 U/mL penicillin and10 mg/mL streptomycin, at 37 C in humidified 5% CO2.

    At confluence (day 0), the medium was changed toDMEM:F-12 (1:1) containing 10% FCS, and differentia-

    tion was induced with 5 mg/mL insulin. The extent ofdifferentiation was quantified by staining intracellular oildroplets with Oil Red O after fixation with 5%formaldehyde.

    On day 14 of culture, insulin was removed, and2 106 M epinephrine or 50 mg/mL pycnogenol wasadded to the medium. The size of oil droplets wascarefully checked.

    Data analyses. The phase-contrast micrographs wererecorded on a PC-AT using a CCD camera (Ikegami,Tokyo) and interface board (TARGA, Truevision Inc.,IN). The area of droplets was determined using a JAVAsoftware (Jandel Scientific, CA).

    Figure 1. Histogram of intracellular droplet area after 14 daysof pycnogenol or epinephrine treatment. 643, 341 or 288droplets in the control, pycnogenol or epinephrine, respec-tively, were counted.

    PHYTOTHERAPY RESEARCHPhytother. Res. 13, 619620 (1999)

    CCC 0951418X/99/07061902 $17.50Copyright # 1999 John Wiley & Sons, Ltd.

    * Correspondence to: N. Hasegawa, Department of Food and Nutrition,Nagoya Bunri College, 2-1 Sasazuka-cho, Nishi-ku, Nagoya 451-0077, Japan.E-mail: hsgwn@nagoya-bunri.ac.jpContract/grant sponsor: Elizabeth Arnold Fuji Foundation.

    Accepted 18 November 1998

  • RESULTS AND DISCUSSION

    Administration of pycnogenol stimulated lipolysismainly in small droplets, and the cells seemed to havelost their cytoplasmic expansion. Similar results wereobtained in epinephrine containing medium. When thedroplet area was expressed as a histogram, the number ofsmall droplets (

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