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Lori T. Raetzman

Profile picture for Lori T. Raetzman

Contact Information

Department of Molecular and Integrative Physiology
524 Burrill Hall, MC-114
407 S. Goodwin Ave
Urbana, IL 61801

Associate Professor of Molecular & Integrative Physiology

Research Interests

Research Topics

Development, Endocrinology, Neurobiology

Disease Research Interests

Neurological and Behavioral Disorders, Reproductive Diseases, Infertility, and Menopause

Research Description

Notch signaling pathway in hypothalamic-pituitary gland development and disease

The pituitary is the master gland coordinating growth, fertility, metabolism and the body's response to stress. To exert these effects, the anterior pituitary has distinct cell types that produce thyroid-stimulating hormone (TSH), adrenocorticotropic hormone (ACTH), luteinizing hormone (LH), follicle-stimulating hormone (FSH), growth hormone (GH), and prolactin (PRL). If the development or function of these cells in the pituitary gland is disrupted, two main diseases result. Hypopituitarism, defined as loss of at least one pituitary hormone, occurs in 1:4000 births. Only a small number of cases are caused by known genetic mutations. The other main category of pituitary disease, tumor formation, is very common, with an incidental prevalence of 30% at autopsy. The genetic causes of pituitary tumors are largely unknown and could result from the loss or gain of function of a normal developmental process.

Research in my laboratory is focused on understanding the role of cell-cell signaling during pituitary development. We hypothesize that the Notch signaling pathway may play an important role in the proliferation and lineage specific differentiation of progenitor cells in the embryonic pituitary. The Notch signaling pathway is an evolutionarily conserved mechanism that orchestrates cell fate choices in a broad spectrum of developmental systems. The core pathway includes two transmembrane ligands, (Delta and Jagged), a transmembrane receptor (Notch), a coactivator (CSL/Rbpsuh) and a downstream transcription factor (Hes). Many components of the Notch pathway are present in the developing pituitary, but their function in this system is unknown.

We are interested in uncovering the role of Notch signaling in the normal development of the pituitary and in pituitary disease. We are exploring if Notch signaling is necessary and sufficient for obtaining the full complement of cells in the pituitary by employing transgenic and knockout mice. These studies also take advantage of molecular genetic techniques and whole animal physiology.

Education

B.A. 1994 Ripon College, Ripon, WI
PhD. 2000 Case Western Reserve University, Cleveland, OH
Postdoc. 2000-2005 University of Michigan, Ann Arbor, MI

Awards and Honors

Medical Scholars Program Outstanding Advisor Award (2015)
James Heath Award for Excellence in Teaching (2010)

Highlighted Publications

Edwards WE, Nantie LB, and Raetzman LT. (2016). Identification of a novel progenitor marker, grainyhead like 2 in the developing pituitary. Dev. Dyn. 45, 1097-1106. [Abstract

Eckstrum KS, Weis KE, Baur NG, Yoshihara Y, and Raetzman LT. (2016). Icam5 expression exhibits sex differences in the neonatal pituitary and is regulated by estradiol and bisphenol A. Endocrinol. 157, 1408-20. [Abstract

Biehl MJ and Raetzman LT. (2015). Rbpj-κ mediated Notch signaling plays a critical role in development of hypothalamic Kisspeptin neurons Dev. Biol. 406:235-46. [Abstract

Nantie LB, Himes AD, Getz DR, Raetzman LT. (2014). Notch signaling in postnatal pituitary expansion: proliferation, progenitors, and cell specification. Mol. Endocrinol.28(5):731-44. [Abstract]

Aujla PK, Naratadam GT, Xu L, Raetzman LT. (2013). Notch/Rbpjκ signaling regulates progenitor maintenance and differentiation of hypothalamic arcuate neurons. Development 140(17):3511-21. [Abstract]

Moran TB, Brannick KE, Raetzman LT. (2012). Aryl-hydrocarbon receptor activity modulates prolactin expression in the pituitary.  Toxicol. Appl. Pharmacol. 265(1):139-45. [Abstract]

Brannick KE, Craig ZR, Himes AD, Peretz JR, Wang W, Flaws JA, Raetzman LT. (2012). Prenatal exposure to low doses of bisphenol A increases pituitary proliferation and gonadotroph number in female mice offspring at birth.  Biol. Reprod. 87(4):82. [Abstract]

Goldberg LB, Aujla PK, and Raetzman LT. (2011). Persistent Expression of Activated Notch Inhibits corticotrope and melanotrope differentiation and results in dysfunction of the HPA axis. Dev. Biol. 358:23-32. [Abstract]

Aujla P.K., Bora A., Monahan P., Sweedler J.V., and Raetzman L.T. (2011). The Notch effector gene Hes1 regulates migration of hypothalamic neurons, neuropeptide content and axon targeting to the pituitary. Dev. Biol. 353:61-71. [Abstract]

Recent Publications

Barbosa, K. L., Dettogni, R. S., Da Costa, C. S., Gastal, E. L., Raetzman, L. T., Flaws, J. A., & Graceli, J. B. (2022). Tributyltin and the Female Hypothalamic-Pituitary-Gonadal Disruption. Toxicological Sciences, 186(2), 179-189. https://doi.org/10.1093/toxsci/kfab141

Cutia, C. A., Leverton, L. K., Ge, X., Youssef, R., Raetzman, L. T., & Christian-Hinman, C. A. (2022). Phenotypic differences based on lateralization of intrahippocampal kainic acid injection in female mice. Experimental Neurology, 355, [114118]. https://doi.org/10.1016/j.expneurol.2022.114118

Ge, X., Weis, K., Flaws, J., & Raetzman, L. (2022). Prenatal exposure to the phthalate DEHP impacts reproduction-related gene expression in the pituitary. Reproductive Toxicology, 108, 18-27. https://doi.org/10.1016/j.reprotox.2021.12.008

Gonzalez, R. V. L., Weis, K. E., Gonsioroski, A. V., Flaws, J. A., & Raetzman, L. T. (2021). Iodoacetic Acid, a Water Disinfection Byproduct, Disrupts Hypothalamic and Pituitary Reproductive Regulatory Factors and Induces Toxicity in the Female Pituitary. Toxicological sciences : an official journal of the Society of Toxicology, 184(1), 46-56. https://doi.org/10.1093/toxsci/kfab106

Weis, K. E., & Raetzman, L. T. (2019). Genistein inhibits proliferation and induces senescence in neonatal mouse pituitary gland explant cultures. Toxicology, 427, [152306]. https://doi.org/10.1016/j.tox.2019.152306

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  • People are exposed to a wide range of phthalates, a group of industrial chemicals, every day, via plastics, personal care products, and building materials. For pregnant women, the negative reproductive health consequences of such exposure pose a serious concern. Recent studies from the University...
  • Chemical disinfection makes water from both natural sources and wastewater streams drinkable; however, the process also creates byproducts, not all of which are understood or regulated. A new study from University of Illinois Urbana-Champaign researchers has found that one byproduct disrupts...
  • Professor Lori Raetzman joined the University of Illinois at Urbana-Champaign in 2005. Since joining, the Raetzman group has produced highly impactful work regarding the development and function of both the pituitary gland and the hypothalamus. Over the past 14 years, students from the Raetzman lab...