Estrogens have widespread applications in health and disease. Postmenopausal women are treated with estrogen replacement therapy to relieve them of the menopausal symptoms. Between 1940-1975, an estimated 5-10 million Americans received diethylstilbestrol (DES), a synthetic estrogen, during pregnancy or were exposed to the drug in utero. Exposure to DES has been associated with an increased risk for breast cancer in """"""""DES mothers"""""""" and a lifetime risk of cervicovaginal cancers in """"""""DES daughters"""""""". Exposure to DES has also been linked to a wide range of abnormalities in """"""""DES sons and daughters"""""""" including immune system disorders such as increased incidence of autoimmunity, cancer and certain infections. Furthermore, a number of xenoestrogens which include environmental estrogens and phytoestrogens have been identified which bind estrogen receptors (ERs) and mediate activity similar to physiological estrogens. Thus, research on DES may serve as a template to study a growing list of endocrine disruptors. Studies from our lab demonstrated for the first time that prenatal and postnatal exposure to estradiol (E2) and DES can induce apoptosis in thymocytes, alter the expression of T cell receptor and CD molecules, and modulate positive and negative selection of T cells. In the current study, we will test the central hypothesis that prenatal exposure to DES alters the positive and/or negative selection of T cells in the thymus leading to generation of skewed T cell repertoire with enhanced reactivity towards self antigens and decreased response against non-self antigens.
In aim# 1, we will investigate whether the regulation of Fas and Fas ligand genes involves estrogen responsive elements (ERE) and other transcription factors.
Aim# 2 will test if prenatal exposure to DES alters positive and negative selection of T cells in the thymus and thereby skewing the immune responsiveness of mature T cells to self rather than non-self antigens.
Aim# 3 will investigate the role of ERa in DES induced apoptosis and development of autoimmunity. Also, the role of T cell-stromal cell interactions in DES-induced thymocyte apoptosis will be studied.
In Aim# 4, the mechanism by which prenatal DES exposure leads to increased susceptibility to autoimmune disease postnatally will be tested. Together, the studies proposed should provide novel information on the mechanism by which prenatal exposure to DES leads postnatally to increased susceptibility to autoimmunity and cancer and to development of potential approaches to prevent such immunotoxicity.
There has been a high incidence of cancers as well as autoimmune diseases observed in women who were prescribed during pregnancy, a synthetic estrogen known as diethylstilbestrol, as well as in their sons and daughters. Postmenopausal women administered estrogens in hormone replacement therapy, as well as, several chemicals found in the environment and foods act as estrogens causing significant health problems. Thus, our studies are aimed at providing insights into the mechanism by which estrogens mediate their toxic effects on the immune system, thereby leading to the development of strategies for their prevention and treatment.
|Miranda, Kathryn; Yang, Xiaoming; Bam, Marpe et al. (2018) MicroRNA-30 modulates metabolic inflammation by regulating Notch signaling in adipose tissue macrophages. Int J Obes (Lond) 42:1140-1150|
|Alhasson, Firas; Seth, Ratanesh Kumar; Sarkar, Sutapa et al. (2018) High circulatory leptin mediated NOX-2-peroxynitrite-miR21 axis activate mesangial cells and promotes renal inflammatory pathology in nonalcoholic fatty liver disease. Redox Biol 17:1-15|
|Bam, Marpe; Yang, Xiaoming; Sen, Souvik et al. (2018) Characterization of Dysregulated miRNA in Peripheral Blood Mononuclear Cells from Ischemic Stroke Patients. Mol Neurobiol 55:1419-1429|
|Elliott, David M; Singh, Narendra; Nagarkatti, Mitzi et al. (2018) Cannabidiol Attenuates Experimental Autoimmune Encephalomyelitis Model of Multiple Sclerosis Through Induction of Myeloid-Derived Suppressor Cells. Front Immunol 9:1782|
|Zhang, Tao; Zhou, Juhua; Man, Gene Chi Wai et al. (2018) MDSCs drive the process of endometriosis by enhancing angiogenesis and are a new potential therapeutic target. Eur J Immunol 48:1059-1073|
|Seth, Ratanesh Kumar; Kimono, Diana; Alhasson, Firas et al. (2018) Increased butyrate priming in the gut stalls microbiome associated-gastrointestinal inflammation and hepatic metabolic reprogramming in a mouse model of Gulf War Illness. Toxicol Appl Pharmacol 350:64-77|
|Bam, M; Yang, X; Zumbrun, E E et al. (2017) Decreased AGO2 and DCR1 in PBMCs from War Veterans with PTSD leads to diminished miRNA resulting in elevated inflammation. Transl Psychiatry 7:e1222|
|Seth, Ratanesh K; Das, Suvarthi; Dattaroy, Diptadip et al. (2017) TRPV4 activation of endothelial nitric oxide synthase resists nonalcoholic fatty liver disease by blocking CYP2E1-mediated redox toxicity. Free Radic Biol Med 102:260-273|
|Chitrala, Kumaraswamy Naidu; Guan, Hongbing; Singh, Narendra P et al. (2017) CD44 deletion leading to attenuation of experimental autoimmune encephalomyelitis results from alterations in gut microbiome in mice. Eur J Immunol 47:1188-1199|
|Sido, Jessica M; Nagarkatti, Prakash S; Nagarkatti, Mitzi (2016) Production of endocannabinoids by activated T cells and B cells modulates inflammation associated with delayed-type hypersensitivity. Eur J Immunol 46:1472-9|
Showing the most recent 10 out of 63 publications