- 112 pages
- English
- PDF
- Available on iOS & Android
About this book
The term insulin dysregulation encompasses different disturbances of insulin regulation in equids, including basal or a pathological high postprandial hyperinsulinemia and/or peripheral insulin resistance. Alterations of insulin signaling, as seen in human type II diabetes mellitus, might be associated with the development of insulin dysregulation, but the underlying pathomechanisms have not been elucidated yet. Therefore, the objective of this study was to determine key proteins of the insulin signaling cascade in insulin dysregulated and healthy horses under basal conditions and after an oral glucose and intravenous insulin challenge. Secondly, the insulin and glucose response to an IV insulin and oral glucose challenge was described to assess glucose and insulin dynamics following different challenges. In principle, insulin signaling was maintained, but the signaling cascade was modified, especially at post-receptor events, in relation to the source of insulin. Thus, ID seems to be an equine-specific metabolic condition, in which alterations of the mTOR signaling pathway may play a crucial role, emphasized by higher mTOR phosphorylation in ID horses. Furthermore, the results of the study support that both terms, hyperinsulinemia and insulin resistance, have to be clearly distinguished in the context of insulin dysregulation.
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Table of contents
- 1 INTRODUCTION
- 1.1 Insulin dysregulation and insulin resistance
- 1.2 Equine Metabolic Syndrome
- 1.3 Differential diagnosis: pituitary pars intermedia dysfunction
- 1.4 Endocrinopathic laminitis
- 1.5 Diagnosis of insulin dysregulation
- 1.6 (Patho-) physiological actions of insulin
- 2 HYPOTHESES, OBJECTIVES AND AIMS
- 3 MANUSCRIPT I
- 4 MANUSCRIPT II
- 5 GENERAL DISCUSSION
- 5.1 The role of peripheral insulin sensitivity in equine insulin dysregulation
- 5.2 Potential impairments of whole-body protein synthesis
- 5.3 The potential role of inflammation in the pathogenesis of ID
- 5.4 Future perspectives
- 6 SUMMARY AND CONCLUSION
- 7 REFERENCES