The effects of progesterone and synthetic derivatives on Fathead Minnow (Pimphales promelas) embryos.
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1 The effects of progesterone and synthetic derivatives on Fathead Minnow (Pimphales promelas) embryos. JA Stine and DB Huggett, Ph.D. Department of Biological Sciences Ronald E. McNair Post Baccalaureate Achievement Program University of North Texas Denton, Texas
2 Introduction: Pharmaceuticals and personal care products are being routinely detected in surface waters throughout the United States. Little information is available on their fate and potential effects in aquatic systems. This project attempts to quantify the effect of progesterone and its synthetic derivatives on aquatic organisms.
3 Progesterone Background Progesterone and its synthetic forms are commonly used for the purpose of oral contraception and hormone replacement therapy in humans. In fish, progestins (e.g. 17α,20β-dihydroxy-4- pregnen-3-one) are extremely important for many physiological processes, including oocyte maturation and embryo morphogenesis. Given the importance of progestins in mammals and fish, it is essential to determine the developmental consequences of progesterone and synthetic derivatives in the environment.
4 Fathead Minnow The organism used in this study is the fathead minnow (Pimephales promelas). Vast amount of data available concerning all aspects of growth, life cycle, and development. Known sentinel species for aquatic toxicity. Widely available and easily cultured.
5 Objectives of Study: To determine the developmental toxicity of progesterone, norethindrone, and medroxyprogesterone to the fathead minnow. This objective will be achieved by: 1.Exposing fathead minnow embryos for 96 hr to each of the test chemicals 2.microscopically staging and investigating developmental abnormalities 3.assessing survival after the 96 hr exposure.
6 Materials and Methods: P. promelas were cultured and held in standard systems in the Aquatic Toxicology Lab at the University of North Texas. < 24 hr old eggs collected and sorted prior to exposure. P. promelas eggs were placed in exposure jars with differing concentrations of progesterone or synthetic derivatives. 10 eggs were placed in each of three replicate jars for a total of 30 eggs exposed per concentration.
7 Materials and Methods, Cont d. The eggs were staged and observed every 24 hr until the exposure was terminated (96 hr). Abnormalities or death of embryos were noted and recorded. Exposure solutions were renewed every 24 hr (static renewal). Images of abnormal embryos were taken on the last day of the study using a Ziess dissecting scope, digital camera, and Axiovision software.
8 Number Surviving Figure 1. Lethality of Compounds 35 Lethality of Progesterone Compunds 96 Hr. post Exposure Control Solvent Control mg/l 1.25 mg/l 2.50 mg/l 5.0 mg/l 5 0 Progesterone Medroxyprogesterone Norethindrone Exposure Compound
9 Number of Deformities Figure 2: Number Of Abnormalities 35 Number of Abnormalities 96 hr. Post Exposure mg/l mg/l.3125 mg/l mg/l mg/l mg/l2 5.0 mg/l2 0 Progesterone Medroxyprogesterone Norethindrone Exposure Compound
10 Heartrate in Beats Per Minute (bpm) Figure 3: Bradycardia per Concentration 180 Bradycardia Per Exposure Concentration Progesterone Medroxyprogesterone Control Solvent Control 0.78 mg/l mg/l.3125 mg/l mg/l 1.25 mg/l 2.50 mg/l 5.00 mg/l Concentration of Exposure Compound
11 Discussion of Findings: The rank order potency in this experiment was: progesterone > medroxyprogesterone > norethindrone Progesterone significantly reduced survival at concentrations 1.25 mg/l. All compounds tested produced cardiovascular abnormalities.
12 Discussion of Findings, Cont d. An increased prevalence of cardiac edema, ventricular enlargement and elongation were observed at mg/l. Bradycardia was observed beginning at the lowest dose concentration, mg/l, and increased proportionally per exposure concentration. Mammalian data demonstrate that progesterone does alter normal cardiovascular physiology. In the 2.5 and 5 mg/l medroxyprogesterone exposed fish, blood accumulated in the heads of the fish.
13 Figure 4. Representative Embryos following 96 Hr. Exposure to Progesterone
14 Directions for Future Research: Further study is needed to determine the mechanism(s) of malformations in the fathead minnow embryos following progestin exposure. Are amphibian embryos affected in the same way as piscine embryos? What are the Lowest Observable Effect Level (LOEL) for progesterone and synthetics or both fish and amphibians? What is the LC 50 for progesterone and synthetics? Is the Nip3a pathway affected by presence of exogenous progesterone? Perform field studies to investigate the impacts of progesterone on fish and amphibians Cattle dominated watersheds
15 Acknowledgements: UNT McNair Scholars Program Dr. David Hala Dr. Lene Petersen Mr. David Baxter UNT Department of Biological Sciences
16 Literature Cited: Brammer, JD; Puyear, R; et al; Prehatching development of the Fathead Minnow, Pimephales promelas Rafinesque.; July EPA 600-R Office of Research and Development, U.S. Environmental Protection Agency. 49 pages
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