0021-972X/04/$15.00/0 The Journal of Clinical Endocrinology & Metabolism 89(11):5577–5582 Printed in U.S.A. Copyright © 2004 by The Endocrine Society doi: 10.1210/jc.2004-0603 Interleukin-6 Regulates Human Adipose Tissue Lipid Metabolism and Leptin Produc