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Glucose Kinetics and Hepatic Gluconeogenesis in Ketotic and Fasted Steers Robert Randall Lyle Iowa State University

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Glucose Kinetics and Hepatic Gluconeogenesis in Ketotic and Fasted Steers Robert Randall Lyle Iowa State University Iowa State University Capstones, Theses and Retrospective Theses and Dissertations Dissertations 1983 Glucose kinetics and hepatic gluconeogenesis in ketotic and fasted steers Robert Randall Lyle Iowa State University Follow this and additional works at: https://lib.dr.iastate.edu/rtd Part of the Agriculture Commons, and the Animal Sciences Commons Recommended Citation Lyle, Robert Randall, "Glucose kinetics and hepatic gluconeogenesis in ketotic and fasted steers " (1983). Retrospective Theses and Dissertations. 8418. https://lib.dr.iastate.edu/rtd/8418 This Dissertation is brought to you for free and open access by the Iowa State University Capstones, Theses and Dissertations at Iowa State University Digital Repository. It has been accepted for inclusion in Retrospective Theses and Dissertations by an authorized administrator of Iowa State University Digital Repository. For more information, please contact [email protected]. INFORMATION TO USERS This reproduction was made from a copy of a document sent to us for microfilming. While the most advanced technology has been used to photograph and reproduce this document, the quality of the reproduction is heavily dependent upon the quality of the material submitted. The following explanation of techniques is provided to help clarify markings or notations which may appear on this reproduction. 1.The sign or "target" for pages apparently lacking from the document photographed is "Missing Page(s)". If it was possible to obtain the missing page(s) or section, they are spliced into the film along with adjacent pages. This may have necessitated cutting through an image and duplicating adjacent pages to assure complete continuity. 2. When an image on the film is obliterated with a round black mark, it is an indication of either blurred copy because of movement during exposure, duplicate copy, or copyrighted materials that should not have been filmed. For blurred pages, a good image of the page can be found in the adjacent frame. If copyrighted materials were deleted, a target note will appear listing the pages in the adjacent frame. 3. When a map, drawing or chart, etc., is part of the material being photographed, a definite method of "sectioning" the material has been followed. It is customary to begin filming at the upper left hand comer of a large sheet and to continue from left to right in equal sections with small overlaps. If necessary, sectioning is continued again—beginning below the first row and continuing on until complete. 4. For illustrations that cannot be satisfactorily reproduced by xerographic means, photographic prints can be purchased at additional cost and inserted into your xerographic copy. These prints are available upon request from the Dissertations Customer Services Department. 5. Some pages in any document may have indistinct print. In all cases the best available copy has been filmed. Universi^ Micronlms international 300 N. Zeeb Road Ann Artx)r, Ml 48106 8323299 Lylé, Robert Randall GLUCOSE KINETICS AND HEPATIC GLUCONEOGENESIS IN KETOTIC AND FASTED STEERS Iowa State University PH.D. 1983 University IVIicrofilms I ntGrn&tiOn&l SOO N. Zœb Road, Ann Arbor, Ml48106 Glucose kinetics and hepatic gluconeogenesis in ketotic and fasted steers by Robert Randall Lyle A Dissertation Submitted to the Graduate Faculty in Partial Fulfillment of the Requirements for the Degree of DOCTOR OF PHILOSOPHY Department: Animal Science Major: Nutritional Physiology Approved: Signature was redacted for privacy. Signature was redacted for privacy. Signature was redacted for privacy. Iowa State University Ames, Iowa 1983 ii TABLE OF CONTENTS Page INTRODUCTION 1 REVIEW OF LITERATURE 5 Etiology of bovine lactation Ketosis 5 Metabolic effects of ketosis 12 Gluconeogenic precursors in the ruminant 16 Kinetics of glucose metabolism 21 The need for an experimental ketosis 24 Metabolic effects of fasting 27 Metabolic effects of phlorizin 30 Metabolic effects of 1,3-butanediol 34 Summary of literature 38 Explanation of dissertation format 39 REFERENCES CITED 40 SECTION I. GLUCOSE KINETICS AND PLASMA METABOLITES DURING AN EXPERIMENTAL KETOSIS PRODUCED IN STEERS BY 1,3-BUTANEDIOL AND PHLORIZIN 53 ABSTRACT 54 INTRODUCTION 56 EXPERIMENTAL PROCEDURES 59 RESULTS AND DISCUSSION 63 Metabolite concentrations in plasma 63 Kinetics of glucose metabolism 68 GENERAL DISCUSSION 76 ACKNOWLEDGEMENTS 77 REFERENCES CITED 78 iii Page SECTION II. PLASMA AND LIVER METABOLITES AND GLUCOSE KINETICS AS AFFECTED BY PROLONGED KETONEMIA- GLUCOSURIA AND FASTING IN STEERS 82 ABSTRACT 83 INTRODUCTION 85 EXPERIMENTAL PROCEDURES 87 RESULTS AND DISCUSSION 91 Plasma metabolite concentrations 91 Kinetics of glucose metabolism 99 Liver metabolite concentrations 104 GENERAL DISCUSSION 110 REFERENCES CITED 113 SECTION III. IN VITRO HEPATIC GLUCONEO- GENESIS AND KETOGENESIS AS AFFECTED BY PROLONGED KETONEMIA- GLUCOSURIA AND FASTING IN STEERS 118 ABSTRACT 119 INTRODUCTION 121 MATERIALS AND METHODS 125 Experimental design 125 Liver biopsy 125 Incubation procedure 126 Analytical procedures and presentation of data 128 RESULTS AND DISCUSSION 130 Rates of gluconeogenesis and oxidation of gluconeogenic substrates 130 iv Page Effects of Ca , ketone bodies, and fatty acids on gluconeogenesis 136 Effects of niacin and NAD"*" on gluconeogenesis 143 Factors affecting substrate oxidation 144 Ketogenesis and oxidation of ketogenic substrates 149 GENERAL DISCUSSION 154 REFERENCES CITED 159 GENERAL SUMMARY 163 REFERENCES CITED 171 ACKNOWLEDGEMENTS 172 APPENDIX 173 ASSAY OF LOW CONCENTRATIONS OF LONG-CHAIN FATTY ACIDS IN PLASMA BY FORMING ®®Ni SALTS 177 V LIST OF TABLES Page SECTION I. Table 1. Treatments used in the 4x4 Latin square 60 Table 2. Effects of feeding 1,3-butanediol, injecting phlorizin, and a com­ bination thereof on urinary glucose excretion and plasma glucose and plasma free fatty acid concentra­ tions in steers 64 Table 3. Effects of feeding 1,3-butanediol, injecting phlorizin, and a com­ bination thereof on blood ketone body concentrations, blood ketone body ratios, and urinary ketone body excretion in steers 66 Table 4. Slopes of plasma glucose specific radioactivity decay curve segments between 240 and 360 min and 360 and 480 min after [U-^'^C]glucose injection 71 Table 5. Effects of feeding 1,3-butanediol, injecting phlorizin, and a com­ bination thereof on kinetics of glucose metabolism in steers 72 SECTION II. Table 1. Experimental design and treat­ ments 88 Table 2. Effects of 1,3-butanediol and phlorizin treatment and fasting on urinary glucose excretion and on plasma glucose, free fatty acid, insulin, glucagon, and growth hormone concentrations in steers 92 vi Page Table 3. Effects of 1,3-butanediol and phlorizin treatment and fasting on blood ketone body concentra­ tions and urinary ketone body excretion in steers 97 Table 4. Effects of 1,3-butanediol and phlorizin treatment and fasting on kinetics of glucose metabolism in steers 100 Table 5. Effects of 1,3-butanediol and phlorizin treatment and fasting on liver metabolite concentrations in steers 105 SECTION III. Table 1. Effects of 1,3-butanediol and phlorizin treatment, and fasting on in vitro gluconeo- genesis and substrate oxidation in liver slices from steers 131 Table 2. Effects of Ca**-free buffer and additions of ketone bodies, fatty acids, BSA, NAD"*", and niacin on in vitro gluconeogenic capacity of liver slices from steers 137 Table 3. Effects of Ca**-free buffer and additions of ketone bodies, fatty acids, BSA, NAD"*", and niacin on in vitro substrate oxidation by liver slices from steers 146 Table 4. Correlation coefficients for media glucose vs. gluconeogenic rate and substrate oxidation rate vs. gluconeogenic rate in liver slice incubations 148 vii Page Table 5. Effect of 1,3-butanediol and phlorizin treatment and fasting on in vitro ketogenesis and substrate oxidation in liver slices from steers 151 APPENDIX Table Al. Effects of in vivo treatments and in vitro additions on amount of glucose in incubation media 174 Table A2. Coefficients of correlation between amount of glucose in incubation media and hepatic gluconeogenic rate 175 Table A3. Coefficients of correlation between in vitro hepatic substrate oxidation rate and gluconeogenic rate 176 Table A4. Amount of Ni recovered in labeling solution as affected by volume of plasma per assay 189 Table AS. Effect of sample volume on FFA determinations 190 Table A6. Amount of i*C-stearate recovered from labeling solution as affected by silicic acid 190 Table A7. Efficiency of extraction of ^^C- stearate from BSA in aqueous solu­ tion as affected by extraction solution and silicic acid 192 Table AS. Efficiency of extraction as affected by pH of phosphate buffer 193 Table A9. Recovery of stearic acid additions from steer plasma 195 viii Page Table AlO. Formation of chloroform-heptane soluble complexes with ®'Ni by stearic acid and other metabolites 196 Table All. Effect of metabolites on the amount of Ni recovered in the labeling solution in the presence of stearic acid 199 Table A12. Effect of lecithin on amount of Ni recovered in labeled solutions of steer plasma extracts 200 Table A13. Molar ratio of FFA to Ni in labeling solution as affected by specific radioactivity of ®'Ni working solution 204 Table A14. Within-run precision of the ®®Ni radiochemical assay 206 ix LIST OF FIGURES SECTION I. Figure 1. Plasma glucose specific radio­ activity decay curve after intravenous injection of [U-^'^C]glucose in a steer (Data points represent observed values. The equation for the line of best fit to the data
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