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Dive into the research topics where Hayley Coffing is active.

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Featured researches published by Hayley Coffing.


American Journal of Physiology-gastrointestinal and Liver Physiology | 2016

Lactobacillus acidophilus Counteracts Inhibition of NHE3 and DRA Expression and Alleviates Diarrheal Phenotype in Mice Infected With Citrobacter rodentium.

Anoop Kumar; Arivarasu N. Anbazhagan; Hayley Coffing; Ishita Chatterjee; Shubha Priyamvada; Tarunmeet Gujral; Seema Saksena; Ravinder K. Gill; Waddah A. Alrefai; Alip Borthakur; Pradeep K. Dudeja

Impaired absorption of electrolytes is a hallmark of diarrhea associated with inflammation or enteric infections. Intestinal epithelial luminal membrane NHE3 (Na+/H+ exchanger 3) and DRA (Down-Regulated in Adenoma; Cl-/HCO3- exchanger) play key roles in mediating electroneutral NaCl absorption. We have previously shown decreased NHE3 and DRA function in response to short-term infection with enteropathogenic E coli (EPEC), a diarrheal pathogen. Recent studies have also shown substantial downregulation of DRA expression in a diarrheal model of infection with Citrobacter rodentium, the mouse counterpart of EPEC. Since our previous studies showed that the probiotic Lactobacillus acidophilus (LA) increased DRA and NHE3 function and expression and conferred protective effects in experimental colitis, we sought to evaluate the efficacy of LA in counteracting NHE3 and DRA inhibition and ameliorating diarrhea in a model of C rodentium infection. FVB/N mice challenged with C rodentium [1 × 109 colony-forming units (CFU)] with or without administration of live LA (3 × 109 CFU) were assessed for NHE3 and DRA mRNA and protein expression, mRNA levels of carbonic anhydrase, diarrheal phenotype (assessed by colonic weight-to-length ratio), myeloperoxidase activity, and proinflammatory cytokines. LA counteracted C rodentium-induced inhibition of colonic DRA, NHE3, and carbonic anhydrase I and IV expression and attenuated diarrheal phenotype and MPO activity. Furthermore, LA completely blocked C rodentium induction of IL-1β, IFN-γ, and CXCL1 mRNA and C rodentium-induced STAT3 phosphorylation. In conclusion, our data provide mechanistic insights into antidiarrheal effects of LA in a model of infectious diarrhea and colitis.


American Journal of Physiology-gastrointestinal and Liver Physiology | 2015

Transforming growth factor-β2 is sequestered in preterm human milk by chondroitin sulfate proteoglycans

Kopperuncholan Namachivayam; Hayley Coffing; Nehru Viji Sankaranarayanan; Yingzi Jin; Krishnan MohanKumar; Brandy L. Frost; Cynthia L. Blanco; Aloka L. Patel; Paula P. Meier; Steven A. Garzon; Umesh R. Desai

Human milk contains biologically important amounts of transforming growth factor-β2 isoform (TGF-β2), which is presumed to protect against inflammatory gut mucosal injury in the neonate. In preclinical models, enterally administered TGF-β2 can protect against experimental necrotizing enterocolitis, an inflammatory bowel necrosis of premature infants. In this study, we investigated whether TGF-β bioactivity in human preterm milk could be enhanced for therapeutic purposes by adding recombinant TGF-β2 (rTGF-β2) to milk prior to feeding. Milk-borne TGF-β bioactivity was measured by established luciferase reporter assays. Molecular interactions of TGF-β2 were investigated by nondenaturing gel electrophoresis and immunoblots, computational molecular modeling, and affinity capillary electrophoresis. Addition of rTGF-β2 (20-40 nM) to human preterm milk samples failed to increase TGF-β bioactivity in milk. Milk-borne TGF-β2 was bound to chondroitin sulfate (CS) containing proteoglycan(s) such as biglycan, which are expressed in high concentrations in milk. Chondroitinase treatment of milk increased the bioactivity of both endogenous and rTGF-β2, and consequently, enhanced the ability of preterm milk to suppress LPS-induced NF-κB activation in macrophages. These findings provide a mechanism for the normally low bioavailability of milk-borne TGF-β2 and identify chondroitinase digestion of milk as a potential therapeutic strategy to enhance the anti-inflammatory effects of preterm milk.


American Journal of Physiology-gastrointestinal and Liver Physiology | 2018

Epigenetic modulation of intestinal Na+/H+ exchanger-3 expression

Anoop Kumar; Pooja Malhotra; Hayley Coffing; Shubha Priyamvada; Arivarasu N. Anbazhagan; Harish R. Krishnan; Ravinder K. Gill; Waddah A. Alrefai; David P. Gavin; Subhash C. Pandey; Pradeep K. Dudeja; Seema Saksena

Na+/H+ exchanger-3 (NHE3) is crucial for intestinal Na+ absorption, and its reduction has been implicated in infectious and inflammatory bowel diseases (IBD)-associated diarrhea. Epigenetic mechanisms such as DNA methylation are involved in the pathophysiology of IBD. Whether changes in DNA methylation are involved in modulating intestinal NHE3 gene expression is not known. Caco-2 and HuTu 80 cells were used as models of human intestinal epithelial cells. Normal C57/BL6, wild-type, or growth arrest and DNA damage-inducible 45b (GADD45b) knockout (KO) mice were used as in vivo models. NHE3 gene DNA methylation levels were assessed by MBDCap (MethyMiner) assays. Results demonstrated that in vitro methylation of NHE3 promoter construct (p-1509/+127) cloned into a cytosine guanine dinucleotide-free lucia vector decreased the promoter activity in Caco-2 cells. DNA methyltransferase inhibitor 5-azacytidine (10 μM, 24 h) caused a significant decrease in DNA methylation of the NHE3 gene and concomitantly increased NHE3 expression in Caco-2 cells. Similarly, 5-azacytidine treatment increased NHE3 mRNA levels in HuTu 80 cells. 5-Azacytidine treatment for 3 wk (10 mg/kg body wt ip, 3 times/wk) also resulted in an increase in NHE3 expression in the mouse ileum and colon. Small-interfering RNA knockdown of GADD45b (protein involved in DNA demethylation) in Caco-2 cells decreased NHE3 mRNA expression. Furthermore, there was a significant decrease in NHE3 mRNA and protein expression in the ileum and colon of GADD45b KO mice. Our findings demonstrate that NHE3 gene expression is regulated by changes in its DNA methylation. NEW & NOTEWORTHY Our studies for the first time demonstrate that Na+/H+ exchanger-3 gene expression is regulated by an epigenetic mechanism involving DNA methylation.


American Journal of Physiology-gastrointestinal and Liver Physiology | 2018

Clostridium difficile toxins A and B decrease intestinal SLC26A3 protein expression

Hayley Coffing; Shubha Priyamvada; Arivarasu N. Anbazhagan; Christine Salibay; Melinda A. Engevik; James Versalovic; Mary Beth Yacyshyn; Bruce R. Yacyshyn; Sangeeta Tyagi; Seema Saksena; Ravinder K. Gill; Waddah A. Alrefai; Pradeep K. Dudeja

Clostridium difficile infection (CDI) is the primary cause of nosocomial diarrhea in the United States. Although C. difficile toxins A and B are the primary mediators of CDI, the overall pathophysiology underlying C. difficile-associated diarrhea remains poorly understood. Studies have shown that a decrease in both NHE3 (Na+/H+ exchanger) and DRA (downregulated in adenoma, Cl-/[Formula: see text] exchanger), resulting in decreased electrolyte absorption, is implicated in infectious and inflammatory diarrhea. Furthermore, studies have shown that NHE3 is depleted at the apical surface of intestinal epithelial cells and downregulated in patients with CDI, but the role of DRA in CDI remains unknown. In the current studies, we examined the effects of C. difficile toxins TcdA and TcdB on DRA protein and mRNA levels in intestinal epithelial cells (IECs). Our data demonstrated that DRA protein levels were significantly reduced in response to TcdA and TcdB in IECs in culture. This effect was also specific to DRA, as NHE3 and PAT-1 (putative anion transporter 1) protein levels were unaffected by TcdA and TcdB. Additionally, purified TcdA and TcdA + TcdB, but not TcdB, resulted in a decrease in colonic DRA protein levels in a toxigenic mouse model of CDI. Finally, patients with recurrent CDI also exhibited significantly reduced expression of colonic DRA protein. Together, these findings indicate that C. difficile toxins markedly downregulate intestinal expression of DRA which may contribute to the diarrheal phenotype of CDI. NEW & NOTEWORTHY Our studies demonstrate, for the first time, that C. difficile toxins reduce DRA protein, but not mRNA, levels in intestinal epithelial cells. These findings suggest that a downregulation of DRA may be a critical factor in C. difficile infection-associated diarrhea.


Gastroenterology | 2017

Activation of Nuclear Factor−κB by Tumor Necrosis Factor in Intestinal Epithelial Cells and Mouse Intestinal Epithelia Reduces Expression of the Chloride Transporter SLC26A3

Anoop Kumar; Ishita Chatterjee; Tarunmeet Gujral; Anas Alakkam; Hayley Coffing; Arivarasu N. Anbazhagan; Alip Borthakur; Seema Saksena; Ravinder K. Gill; Waddah A. Alrefai; Pradeep K. Dudeja


Gastroenterology | 2014

Mo1746 TNF Inhibits SLC26A3 Expression via Activation of NF-κB Pathway

Anoop Kumar; Tarunmeet Gujral; Ravinder K. Gill; Hayley Coffing; Arivarasu Natarajan Anbazhagan; Alip Borthakur; Waddah A. Alrefai; Pradeep K. Dudeja


Gastroenterology | 2017

Decreased Expression of SLC26A3 Protein in a Toxigenic Mouse Model and Patients with Clostridium Difficile Infection

Hayley Coffing; Melinda A. Engevik; Sangeeta Tyagi; Shubha Priyamvada; Arivarasu Natarajan Anbazhagan; Seema Saksena; Ravinder K. Gill; Waddah A. Alrefai; James Versalovic; Pradeep K. Dudeja


Gastroenterology | 2016

Su1198 A Novel Mechanism of Intestinal NHE3 Gene Regulation by Histone Modification

Anoop Kumar; Pooja Malhotra; Saminathan Muthusamy; Hayley Coffing; Ravinder K. Gill; Waddah A. Alrefai; David P. Gavin; Pradeep K. Dudeja; Seema Saksena


Gastroenterology | 2016

Sa1429 Gene Expression and miRNA Profiling in Ileal Mucosa of SERT Knock-Out Mouse Using Microarray Approaches

Christopher R. Manzella; Megha Singhal; Anoop Kumar; Hayley Coffing; Alexander L. Ticho; Shubha Priyamvada; Arivarasu Natarajan Anbazhagan; Seema Saksena; Waddah A. Alrefai; Pradeep K. Dudeja; Ravinder K. Gill


Archive | 2015

Milk by Chondroitin Sulfate Proteoglycans 2

Hayley Coffing; Nehru Viji Sankaranarayanan; Krishnan MohanKumar; Brandy L. Frost; Cynthia L. Blanco; Aloka L. Patel; Steven A. Garzon; Umesh R. Desai; Bruce B. Downs Blvd

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Pradeep K. Dudeja

University of Illinois at Chicago

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Ravinder K. Gill

University of Illinois at Chicago

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Waddah A. Alrefai

University of Illinois at Chicago

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Seema Saksena

University of Illinois at Chicago

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Anoop Kumar

University of Illinois at Chicago

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Shubha Priyamvada

University of Illinois at Chicago

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Alip Borthakur

University of Illinois at Chicago

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Arivarasu N. Anbazhagan

University of Illinois at Chicago

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Tarunmeet Gujral

University of Illinois at Chicago

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Ishita Chatterjee

University of Illinois at Chicago

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