Michael S. Freemark, MD

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• Psychiatry

Division Chief

Department / Division:
Pediatrics / Endocrinology

Address:
DUMC 3080
Durham, NC 27710

Appointment Telephone:
919-684-3772

Office Telephone:
919-684-3772

Fax Telephone:
919-684-8613

• MD, Duke University School of Medicine, 1976

• Pediatrics, Duke University Medical Center, 1976-1979

• Pediatric Endocrinology, Duke University Medical Center, 1980-1984
• Lineberger Cancer Center, University of North Carolina, 1990
• Necker Hospital for Sick Children (France), 1993, 2006

Clinical Interests:
Pediatric endocrinology, hypothalamic-pituitary dysfunction, disorders of growth, thyroid function, and sexual development, diabetes mellitus, insulin resistance

Research Interests:
The primary objective of my basic research effort is to elucidate the roles of fetal and placental hormones in the regulation of maternal metabolism and fetal growth.  My studies have focused on the lactogenic hormones produced by the pituitary gland and placenta.  In recent studies we have explored  the molecular mechanisms by which prolactin and placental lactogen regulate pancreatic insulin production and control lipid metabolism during pregnancy and postnatal life.  
I also have a clinical research interest in the pathogenesis and treatment of obesity and the prevention of type 2 diabetes.  Recent studies show that the drug metformin reduces fat stores and blood glucose and insulin levels in obese adolescents and may reduce the risk of progression to diabetes in selected patients.  Finally, we are exploring the clinical course of diabetic children with celiac disease, an intestinal disorder that affects nutrient absorption.

Representative Publications:
Freemark M. Regulation of maternal metabolism by pituitary and placental hormones: roles in fetal development and metabolic programming. Horm Res. 2006;65 Suppl 3:41-9. (2006) Abstract

Fleenor D, Arumugam R, Freemark M. Growth hormone and prolactin receptors in adipogenesis: STAT-5 activation, suppressors of cytokine signaling, and regulation of insulin-like growth factor I. Horm Res. 2006;66(3):101-10. (2006) Abstract

Speiser PW, Rudolf MC, Anhalt H, Camacho-Hubner C, Chiarelli F, Eliakim A, Freemark M, Gruters A, Hershkovitz E, Iughetti L, Krude H, Latzer Y, Lustig RH, Pescovitz OH, Pinhas-Hamiel O, Rogol AD, Shalitin S, Sultan C, Stein D, Vardi P, Werther GA, Zadik Z, Zuckerman-Levin N, Hochberg Z, . Childhood obesity. J Clin Endocrinol Metab. 2005 Mar;90(3):1871-87. (2005) Abstract

Fleenor D, Oden J, Kelly PA, Mohan S, Alliouachene S, Pende M, Wentz S, Kerr J, Freemark M. Roles of the lactogens and somatogens in perinatal and postnatal metabolism and growth: studies of a novel mouse model combining lactogen resistance and growth hormone deficiency. Endocrinology. 2005 Jan;146(1):103-12. (2005) Abstract

Artz E, Haqq A, Freemark M. Hormonal and metabolic consequences of childhood obesity. Endocrinol Metab Clin North Am. 2005 Sep;34(3):643-58, ix. (2005) Abstract

Freemark M. Editorial: Growth hormone treatment of "idiopathic short stature": not so fast. J Clin Endocrinol Metab. 2004 Jul;89(7):3138-9. (2004) Abstract

Freemark M, Kiess W. Anti-obesity medication use in adolescents: risks and benefits. Pediatr Endocrinol Rev. 2004 Nov;2 Suppl 1:168-70. (2004) Abstract

Artz E, Freemark M. The pathogenesis of insulin resistance in children: metabolic complications and the roles of diet, exercise and pharmacotherapy in the prevention of type 2 diabetes. Pediatr Endocrinol Rev. 2004 Mar;1(3):296-309. (2004) Abstract

Freemark M. Pharmacologic approaches to the prevention of type 2 diabetes in high risk pediatric patients.  J Clin Endocrinol Metab.  2003 Jan;88(1):3-13. (2003) Abstract

Freemark M. Pharmacologic approaches to the prevention of type 2 diabetes in high risk pediatric patients. J Clin Endocrinol Metab. 2003 Jan;88(1):3-13. (2003) Abstract

Freemark M, Levitsky LL. Screening for celiac disease in children with type 1 diabetes: two views of the controversy. Diabetes Care. 2003 Jun;26(6):1932-9. (2003) Abstract

Oden J, Freemark M. Thyroxine supplementation in preterm infants: critical analysis. Curr Opin Pediatr. 2002 Aug;14(4):447-52. (2002) Abstract

Oden J, Fleenor D, Driscoll P, Freemark M. Leptin in the newborn mouse. Plasma concentrations, characterization of the circulating hormone, and tissue source. Biol Neonate. 2002 Aug;82(2):109-16. (2002) Abstract

Litton J, Rice A, Friedman N, Oden J, Lee MM, Freemark M. Insulin pump therapy in toddlers and preschool children with type 1 diabetes mellitus. J Pediatr. 2002 Oct;141(4):490-5. (2002) Abstract

Freemark M, Avril I, Fleenor D, Driscoll P, Petro A, Opara E, Kendall W, Oden J, Bridges S, Binart N, Breant B, Kelly PA. Targeted deletion of the PRL receptor: effects on islet development, insulin production, and glucose tolerance. Endocrinology. 2002 Apr;143(4):1378-85. (2002) Abstract

Rapaport R, Rose SR, Freemark M. Hypothyroxinemia in the preterm infant: the benefits and risks of thyroxine treatment. J Pediatr. 2001 Aug;139(2):182-8. (2001) Abstract

Kelly PA, Binart N, Freemark M, Lucas B, Goffin V, Bouchard B. Prolactin receptor signal transduction pathways and actions determined in prolactin receptor knockout mice. Biochem Soc Trans. 2001 May;29(Pt 2):48-52. (2001) Abstract

Freemark M. Ontogenesis of prolactin receptors in the human fetus: roles in fetal development. Biochem Soc Trans. 2001 May;29(Pt 2):38-41. (2001) Abstract

Freemark M, Fleenor D, Driscoll P, Binart N, Kelly P. Body weight and fat deposition in prolactin receptor-deficient mice. Endocrinology. 2001 Feb;142(2):532-7. (2001) Abstract

Freemark M, Bursey D. The effects of metformin on body mass index and glucose tolerance in obese adolescents with fasting hyperinsulinemia and a family history of type 2 diabetes. Pediatrics. 2001 Apr;107(4):E55. (2001) Abstract

Fleenor DE, Freemark M. Prolactin induction of insulin gene transcription: roles of glucose and signal transducer and activator of transcription 5. Endocrinology. 2001 Jul;142(7):2805-10. (2001) Abstract

Petryk A, Fleenor D, Driscoll P, Freemark M. Prolactin induction of insulin gene expression: the roles of glucose and glucose transporter-2. J Endocrinol. 2000 Mar;164(3):277-86. (2000) Abstract

Handwerger S, Freemark M. The roles of placental growth hormone and placental lactogen in the regulation of human fetal growth and development. J Pediatr Endocrinol Metab. 2000 Apr;13(4):343-56. (2000) Abstract

Fleenor D, Petryk A, Driscoll P, Freemark M. Constitutive expression of placental lactogen in pancreatic beta cells: effects on cell morphology, growth, and gene expression. Pediatr Res. 2000 Jan;47(1):136-42. (2000) Abstract

Freemark M. The fetal adrenal and the maturation of the growth hormone and prolactin axes. Endocrinology. 1999 May;140(5):1963-5. (1999) Abstract

Rivkees SA, Sklar C, Freemark M. Clinical review 99: The management of Graves' disease in children, with special emphasis on radioiodine treatment. J Clin Endocrinol Metab. 1998 Nov;83(11):3767-76. (1998) Abstract

Freemark, M.: Human Placental Lactgen (Human Chorionic Somatommotropin). In, Encyclopedia of Reproduction. E. Knobil and J.D. Neill (eds.), Academic Press, California, Vol 2, pp.694-700, 1998. (1998)

Freemark, M.:  The roles of growth hormone, prolactin and placental lactogen in human fetal development:  Critical analysis of molecular,  cellular and clinical investigations.  In, Molecular and Cellular Pediatric Endocrinology.  S. Handwerger (ed.), The Humana Press, Inc., Totowa, NJ, 1999, pp. 57-83. (1997)

Freemark M, Driscoll P, Maaskant R, Petryk A, Kelly PA. Ontogenesis of prolactin receptors in the human fetus in early gestation. Implications for tissue differentiation and development. J Clin Invest. 1997 Mar 1;99(5):1107-17. (1997) Abstract

Freemark M, Driscoll P, Andrews J, Kelly PA, Royster M. Ontogenesis of prolactin receptor gene expression in the rat olfactory system: potential roles for lactogenic hormones in olfactory development. Endocrinology. 1996 Mar;137(3):934-42. (1996) Abstract

Royster M, Driscoll P, Kelly PA, Freemark M. The prolactin receptor in the fetal rat: cellular localization of messenger ribonucleic acid, immunoreactive protein, and ligand-binding activity and induction of expression in late gestation. Endocrinology. 1995 Sep;136(9):3892-900. (1995) Abstract

Freemark M, Nagano M, Edery M, Kelly PA. Prolactin receptor gene expression in the fetal rat. J Endocrinol. 1995 Feb;144(2):285-92. (1995) Abstract

Bridges RS, Freemark MS. Human placental lactogen infusions into the medial preoptic area stimulate maternal behavior in steroid-primed, nulliparous female rats. Horm Behav. 1995 Jun;29(2):216-26. (1995) Abstract

Freemark, M., Kirk, K. and Robertson, M.: Cellular distribution of placental lactogen II binding sites in the pregnant rat. Endocrine Journal 2: 199-205, 1994. (1994)

Pihoker C, Robertson MC, Freemark M. Rat placental lactogen-I binds to the choroid plexus and hypothalamus of the pregnant rat. J Endocrinol. 1993 Nov;139(2):235-42. (1993) Abstract

Freemark M, Kirk K, Pihoker C, Robertson MC, Shiu RP, Driscoll P. Pregnancy lactogens in the rat conceptus and fetus: circulating levels, distribution of binding, and expression of receptor messenger ribonucleic acid. Endocrinology. 1993 Oct;133(4):1830-42. (1993) Abstract

Fowlkes J, Freemark M. Placental lactogen-binding sites in isolated fetal fibroblasts: characterization, processing, and regulation. Endocrinology. 1993 Jun;132(6):2477-83. (1993) Abstract

Osborn BH, Fowlkes J, Han VK, Freemark M. Nutritional regulation of insulin-like growth factor-binding protein gene expression in the ovine fetus and pregnant ewe. Endocrinology. 1992 Oct;131(4):1743-50. (1992) Abstract

Freemark M, Keen A, Fowlkes J, Mularoni T, Comer M, Grandis A, Kodack L. The placental lactogen receptor in maternal and fetal sheep liver: regulation by glucose and role in the pathogenesis of fasting during pregnancy. Endocrinology. 1992 Feb;130(2):1063-70. (1992) Abstract

Fowlkes J, Freemark M. Evidence for a novel insulin-like growth factor (IGF)-dependent protease regulating IGF-binding protein-4 in dermal fibroblasts. Endocrinology. 1992 Nov;131(5):2071-6. (1992) Abstract

Fowlkes J, Freemark M. Developmental regulation of insulin-like growth factor binding protein production: studies in fetal, postnatal, and pregnant sheep. J Cell Physiol. 1992 Jul;152(1):19-27. (1992) Abstract

Fowlkes J, Freemark M. Binding of placental lactogen and growth hormone to fetal sheep fibroblasts. Pediatr Res. 1992 Aug;32(2):200-3. (1992) Abstract

Freemark M, Comer M, Mularoni T, D'Ercole AJ, Grandis A, Kodack L. Placental lactogen receptors in maternal sheep liver: effects of fasting and refeeding. Am J Physiol. 1990 Feb;258(2 Pt 1):E338-46. (1990) Abstract

Freemark M, Handwerger S. The role of placental lactogen in the regulation of fetal metabolism and growth. J Pediatr Gastroenterol Nutr. 1989 Apr;8(3):281-3. (1989) Abstract

Freemark M, Comer M. Purification of a distinct placental lactogen receptor, a new member of the growth hormone/prolactin receptor family. J Clin Invest. 1989 Mar;83(3):883-9. (1989) Abstract

Freemark M, Comer M, Mularoni T, D'Ercole AJ, Grandis A, Kodack L. Nutritional regulation of the placental lactogen receptor in fetal liver: implications for fetal metabolism and growth. Endocrinology. 1989 Sep;125(3):1504-12. (1989) Abstract

Hill DJ, Freemark M, Strain AJ, Handwerger S, Milner RD. Placental lactogen and growth hormone receptors in human fetal tissues: relationship to fetal plasma human placental lactogen concentrations and fetal growth. J Clin Endocrinol Metab. 1988 Jun;66(6):1283-90. (1988) Abstract

Freemark M, Comer M, Korner G. Differential solubilization of placental lactogen (PL)- and growth hormone-binding sites: further evidence for a unique PL receptor in fetal and maternal liver. Endocrinology. 1988 Jun;122(6):2771-9. (1988) Abstract

Handwerger S, Freemark M. Role of placental lactogen and prolactin in human pregnancy. Adv Exp Med Biol. 1987;219:399-420. (1987) Abstract

Freemark M, Comer M. Epidermal growth factor (EGF)-like transforming growth factor (TGF) activity and EGF receptors in ovine fetal tissues: possible role for TGF in ovine fetal development. Pediatr Res. 1987 Nov;22(5):609-15. (1987) Abstract

Freemark M, Comer M, Korner G, Handwerger S. A unique placental lactogen receptor: implications for fetal growth. Endocrinology. 1987 May;120(5):1865-72. (1987) Abstract

Freemark M. Epidermal growth factor stimulates glycogen synthesis in fetal rat hepatocytes: comparison with the glycogenic effects of insulin-like growth factor I and insulin. Endocrinology. 1986 Aug;119(2):522-6. (1986) Abstract

Freemark M, Handwerger S. The glycogenic effects of placental lactogen and growth hormone in ovine fetal liver are mediated through binding to specific fetal ovine placental lactogen receptors. Endocrinology. 1986 Feb;118(2):613-8. (1986) Abstract

Freemark M, Comer M, Handwerger S. Placental lactogen and GH receptors in sheep liver: striking differences in ontogeny and function. Am J Physiol. 1986 Sep;251(3 Pt 1):E328-33. (1986) Abstract

Freemark M, Handwerger S. Ovine placental lactogen inhibits glucagon-induced glycogenolysis in fetal rat hepatocytes. Endocrinology. 1985 Apr;116(4):1275-80. (1985) Abstract

Freemark M, D'Ercole AJ, Handwerger S. Somatomedin-C stimulates glycogen synthesis in fetal rat hepatocytes. Endocrinology. 1985 Jun;116(6):2578-82. (1985) Abstract

Freemark M, Handwerger S. Synergistic effects of oPL and insulin on glycogen metabolism in fetal rat hepatocytes. Am J Physiol. 1984 Dec;247(6 Pt 1):E714-8. (1984) Abstract

Freemark M, Handwerger S. Ovine placental lactogen stimulates glycogen synthesis in fetal rat hepatocytes. Am J Physiol. 1984 Jan;246(1 Pt 1):E21-4. (1984) Abstract

Freemark M, Handwerger S. Glycogenolytic effects of the calcium ionophore A23187, but not of vasopressin or angiotensin, in foetal-rat hepatocytes. Biochem J. 1984 Jun 1;220(2):441-5. (1984) Abstract

Freemark M, Handwerger S. Ovine placental lactogen, but not growth hormone, stimulates amino acid transport in fetal rat diaphragm. Endocrinology. 1983 Jan;112(1):402-4. (1983) Abstract

Freemark M, Handwerger S. Ovine placental lactogen stimulates amino acid transport in rat diaphragm. Endocrinology. 1982 Jun;110(6):2201-3. (1982) Abstract

Dubois PJ, Freemark M, Lewis D, Drayer BP, Heinz ER, Osborne D. Case report. Atypical findings in adrenoleukodystrophy. J Comput Assist Tomogr. 1981 Dec;5(6):888-91. (1981) Abstract

Raffin BJ, Freemark M. Streptobacillary rat-bite fever: a pediatric problem. Pediatrics. 1979 Aug;64(2):214-7. (1979) Abstract

Freemark M, Stoff DM, Moja EA, Gillin JC, Wyatt RJ. Testosterone-attenuated stereotype and hyperactivity induced by beta-phenylethylamine in pargyline-pretreated rats. Biol Psychiatry. 1978 Aug;13(4):455-63. (1978) Abstract