Page Banner

United States Department of Agriculture

Agricultural Research Service

Adele J Showker (Jency)
Toxicology and Mycotoxin Research
Biological Science Lab Technician (Biochemistry)
Jency.Showker@ars.usda.gov
Phone: (706) 546-3176
Fax: (706) 546-3116
Room 362
USDA, ARS, SAA
RBRRC
950 COLLEGE STATION ROAD
ATHENS, GA, 30605-2720


Publications (Clicking on the reprint icon Reprint Icon will take you to the publication reprint.)
Elevated Nuclear Sphingoid Base-1-Phosphates and Decreased Histone Deacetylase Activity after Fumonisin B1 Treatment in Mouse Embryonic Fibroblasts - (Peer Reviewed Journal)
Gardner, N., Riley, R.T., Showker, A.J., Voss, K.A., Sachs, A., Maddox, J., Gelineau-Van Waes, J. 2016. Elevated Nuclear Sphingoid Base-1-Phosphates and Decreased Histone Deacetylase Activity after Fumonisin B1 Treatment in Mouse Embryonic Fibroblasts. Journal of Toxicology and Applied Pharmacology. 298: 56-65.
Elevated Nuclear and Cytoplasmic FTY720-Phosphate in Mouse Embryonic Fibroblasts Suggests the Potential for Multiple Mechanisms in FTY720-Induced Neural Tube Defects - (Peer Reviewed Journal)
Gardner, N., Riley, R.T., Showker, A.J., Voss, K.A., Sachs, A., Maddox, J., Gelineau-Van Waes, J. 2015. Elevated Nuclear and Cytoplasmic FTY720-Phosphate in Mouse Embryonic Fibroblasts Suggests the Potential for Multiple Mechanisms in FTY720-Induced Neural Tube Defects. Toxicological Sciences. 150(1):161-168.
Evidence for ceramide synthase inhibition in humans exposed to fumonisins in maize-based foods and living in low or high exposure communities in Guatemala - (Abstract Only)
Riley, R.T., Torres, O., Mutate, J., Grergory, S., Ashley-Koch, A., Showker, A.J., Mitchell, T.R., Maddox, J., Gelineau-Van Waes, J., Voss, K.A. 2016. Evidence for ceramide synthase inhibition in humans exposed to fumonisins in maize-based foods and living in low or high exposure communities in Guatemala. UJNR Toxic Microorganisms Panel Meeting. January 24-29,2016. Tokyo/Nagasaki, Japan.
Fumonisin exposure in women linked to inhibition of an enzyme that is a key event in farm and laboratory animal diseases. - (Abstract Only)
Riley, R.T., Voss, K.A., Showker, A.J., Mitchell, T.R., Torres, O., Matute, J., Gregory, S., Ashley-Koch, A., Maddox, J., Gelineau-Van Waes, J. 2016. Fumonisin exposure in women linked to inhibition of an enzyme that is a key event in farm and laboratory animal diseases. American Chemical Society Abstracts. San Diego, California., March 13, 2016. AGFD 101.
Evidence for fumonisin inhibition of ceramide synthase in humans consuming maize-based foods and living in high exposure communities in Guatemala - (Peer Reviewed Journal)
Riley, R.T., Torres, O., Matute, J., Gregory, S., Ashley-Koch, A., Showker, A.J., Mitchell, T.R., Voss, K.A., Maddox, J., Gelineau-Van Waes, J. 2015. Evidence for fumonisin inhibition of ceramide synthase in humans consuming maize-based foods and living in high exposure communities in Guatemala. Molecular Nutrition and Food Research. 59(11):2209-2224.
Co-occurence of aflatoxins and fumonisins in maize: guatemala as a case study - (Abstract Only)
Voss, K.A., Torres, O., Matute, J., Gelineau-Van Waes, J., Maddox, J., Gregory, S., Ashley-Kich, A., Showker, A.J., Riley, R.T. 2015. Co-occurence of aflatoxins and fumonisins in maize: guatemala as a case study. Gordon Research Conferences. June 14-19,2015. Easton, Massachusetts.
Co-exposure to fumonisins and aflatoxins in maize-based foods in central america: guatemala as a case study - (Abstract Only)
Voss, K.A., Torres, O., Matute, J., Gelineau-Van Waes, J., Maddox, J.R., Gregory, S., Ashley-Koch, A.E., Showker, A.J., Riley, R.T. 2015. Co-exposure to fumonisins and aflatoxins in maize-based foods in central america: guatemala as a case study. Society of Toxicology. March 22-26,2015. San Diego,California.
A Blood Spot Method for Detecting Fumonisin-Induced Changes in Putative Sphingolipid Biomarkers in LM/Bc Mice and Humans - (Peer Reviewed Journal)
Riley, R.T., Showker, A.J., Lee, C.M., Zipperer, C.E., Mitchell, T.R., Voss, K.A., Zitomer, N.C., Torres, O., Matute, J., Gregory, S.G., Ashley-Koch, A.E., Maddox, J.R., Gardner, N., Gelineau-Van Waes, J. 2015. A Blood Spot Method for Detecting Fumonisin-Induced Changes in Putative Sphingolipid Biomarkers in LM/Bc Mice and Humans. Journal of Food Additives & Contaminants. 32(6):934-949.
Human health implications from co-exposure to aflatoxins and fumonisins in maize-based foods in Latin America: Guatemala as a case study - (Peer Reviewed Journal)
Torres, O., Matute, J., Gelineau-Van Waes, J., Maddox, J.R., Gregory, S.G., Ashley-Koch, A.E., Showker, A.J., Voss, K.A., Riley, R.T. 2015. Human health implications from co-exposure to aflatoxins and fumonisins in maize-based foods in Latin America: Guatemala as a case study. World Mycotoxin Journal. 8(2):143-159.
Evidence for Fumonisin inhibition of ceramide synthase in humans: validation in follow-up studies in Guatemala - (Abstract Only)
Riley, R.T., Showker, A.J., Voss, K.A., Gelineau-Van Waes, J., Maddox, J.R., Ashley-Koch, A.E., Gregory, S.G., Matuate, J., Torres, O. 2014. Evidence for Fumonisin inhibition of ceramide synthase in humans: validation in follow-up studies in Guatemala. Toxicologist. 138(1):86.
Urinary fumonisin B1 and estimated fumonisin intake in women from high and low exposure communities in Guatemala Reprint Icon - (Peer Reviewed Journal)
Torres, O., Matute, J., Gelineau-Van Waes, J., Maddox, J.R., Gregory, S.G., Ashley-Koch, A.E., Showker, A.J., Zitomer, N.C., Voss, K.A., Riley, R.T. 2014. Urinary fumonisin B1 and estimated fumonisin intake in women from high and low exposure communities in Guatemala. Molecular Nutrition and Food Research. 58(5):973-983. doi: 10.1002/mnfr.201300481.
Development of biomarkers to assess fumonisin exposure and birth defects - (Book / Chapter)
Riley, R.T., Voss, K.A., Showker, A.J., Torres, O., Matute, J., Maddox, J.R., Rainey, M., Gardner, N.M., Sachs, A., Gregory, S.G., Ashley-Koch, A.E., Krupp, D., Gelineau-Van Waes, J. 2012. Development of biomarkers to assess fumonisin exposure and birth defects. In: Binder, E.M., editor. Proceedings of the World Nutrition Forum, October 10-13, 2012, Marina Bay, Singapore. p. 249-256.
The kinetics of urinary fumonisin B1 excretion in humans consuming maize-based diets Reprint Icon - (Peer Reviewed Journal)
Riley, R.T., Torres, O., Showker, A.J., Zitomer, N.C., Matute, J., Voss, K.A., Gelineau-van Waes, J., Maddox, J.R., Gregory, S.G., Ashley-Koch, A.E. 2012. The kinetics of urinary fumonisin B1 excretion in humans consuming maize-based diets. Molecular Nutrition and Food Research. 56:1445-1455.
Evidence for fumonisin inhibition of ceramide synthase in humans - (Abstract Only)
Riley, R.T., Showker, A.J., Voss, K.A., Gelineau-van Waes, J., Maddox, J.R., Gregory, S.G., Ashley-Koch, A.E., Torres, O. 2012. Evidence for fumonisin inhibition of ceramide synthase in humans [abstract]. The Toxicologist (supplement to Toxicological Sciences). 126(1):237.
TIME- AND DOSE-DEPENDENT CHANGES IN SPHINGOID BASE 1-PHOSPHATES IN TISSUES FROM RATS FED DIETS CONTAINING FUMONISINS - (Abstract Only)
Riley, R.T., Showker, A.J., Voss, K.A. 2005. Time- and dose-dependent changes in sphingoid base 1-phosphates in tissues from rats fed diets containing fumonisins [abstract]. Toxicological Sciences. 84(S1):284-285.
INHIBITION OF SPHINGOLIPID BIOSYNTHESIS DECREASES PHOSPHORYLATED ERK2 IN LLC-PK1 CELLS. - (Peer Reviewed Journal)
Rentz, S.S., Showker, A.J., Meredith, F.I., Riley, R.T. 2005. Inhibition of sphingolipid biosynthesis decreases phosphorylated ERK2 in LLC-PK1 cells. Food and Chemical Toxicology. 43:123-131.
INHIBITION OF CERAMIDE SYNTHASE IN CORN SEEDLINGS INFECTED WITH FUSARIUM VERTICILLIOIDES OR EXPOSED DIRECTLY TO FUMONISIN B1 IN SOIL - (Abstract Only)
Williams, L.D., Glenn, A.E., Bacon, C.W., Showker, A.J., Riley, R.T. 2003. INHIBITION OF CERAMIDE SYNTHASE IN CORN SEEDLINGS INFECTED WITH FUSARIUM VERTICILLIOIDES OR EXPOSED DIRECTLY TO FUMONISIN B1 IN SOIL. Toxicologist. v.77. Abstract. p. 189.
INHIBITION OF CERAMIDE SYNTHASE IN CORN SEEDLINGS INFECTED WITH FUSARIUM VERTICILLIOIDES OR EXPOSED DIRECTLY TO FUMONISIN B1 IN SOIL - (Abstract Only)
WILLIAM, L.D., GLENN, A.E., BACON, C.W., SHOWKER, A.J., RILEY, R.T. 2003. INHIBITION OF CERAMIDE SYNTHASE IN CORN SEEDLINGS INFECTED WITH FUSARIUM VERTICILLIOIDES OR EXPOSED DIRECTLY TO FUMONISIN B1 IN SOIL. TOXICOLOGIST. v.77. Abstract p.189.
KINETICS AND BINDING OF FUMONISIN IN A MODEL SOIL SYSTEM - (Abstract Only)
Williams, L.D., Bacon, C.W., Showker, A.J., Meredith, F.I., Franzluebbers, A.J., Smith, M.A., Wyatt, R., Riley, R.T. 2002. KINETICS AND BINDING OF FUMONISIN IN A MODEL SOIL SYSTEM. Toxicologist. 66:69-70.
FUMONISIN B1 INDUCES DECREASED EXPRESSION OF P42 MAP KINASE IN LLC-PK1 CELLS - (Abstract Only)
Rentz, S.S., Showker, A.J., Meredith, F.I., Riley, R.T. 2002. FUMONISIN B1 INDUCES DECREASED EXPRESSION OF P42 MAP KINASE IN LLC-PK1 CELLS. Toxicologist. 66:7.
INHIBITION OF DE NOVO SPHINGOLIPID BIOSYNTHESIS REDUCES EXPRESSION OF P42 MAP KINASE (ERK2) IN LLC-PK1 CELLS - (Abstract Only)
RENTZ, S.S., SHOWKER, A.J., MEREDITH, F.I., RILEY, R.T. 2002. INHIBITION OF DE NOVO SPHINGOLIPID BIOSYNTHESIS REDUCES EXPRESSION OF P42 MAP KINASE (ERK2) IN LLC-PK1 CELLS. MYCOPATHOLOGIA. v.155. Abstract p.39.
KINETICS AND BINDING OF FUMONISIN IN A MODEL SOIL SYSTEM - (Abstract Only)
WILLIAM, L.D., SHOWKER, A.J., BACON, C.W., SMITH, M.A., WYATT, R.D., MEREDITH, F.I., RILEY, R.T. 2002. KINETICS AND BINDING OF FUMONISIN IN A MODEL SOIL SYSTEM. MYCOPATHOLOGIA. v.155. Abstract p.40.
DISRUPTION OF SPHINGOLIPID METABOLISM AND INDUCTION OF EQUINELEUKOENCEPHALOMALACIA BY FUSARIUM PROLIFERATUM CULTURE MATERIAL CONTAINING FUMONISIN B2 OR FUMONISIN B3 - (Peer Reviewed Journal) - (21-Apr-97)
ELEVATED FREE SPHINGOID BASES AND COMPLEX SPHINGOLIPID DEPLETION AS CONTRIBUTING FACTORS IN FUMONISIN-INDUCED INHIBITION OF CELL GROWTH AND INCREASED CELL DEATH IN LLC-PK1 CELLS - (Peer Reviewed Journal) - (26-Feb-96)
Last Modified: 8/27/2016
Footer Content Back to Top of Page