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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Chapados, Natalie Ann Lavoie, Jean-Marc |
| Description | Country affiliation: Canada Author Affiliation: Chapados NA ( Department of Kinesiology, University of Montreal, Montréal, Québec, Canada. n.chapados@gmail.com) |
| Abstract | The purpose of the study was: (1) to determine the effects of microsomal triglyceride transfer protein (MTP) inhibition on endoplasmic reticulum (ER) stress in liver, and (2) to determine if this response is altered in exercise-trained rats. Female Sprague-Dawley rats (6 weeks) fed either a standard (SD) or a high-saturated fat (HF; 43% as energy) diet were trained (Tr) or kept sedentary (Sed) for 6 week. Exercise training consisted of continuous running on a motor-driven rodent treadmill 5 times/week. Ten days before the end of these interventions, rats were administrated (ip) daily a MTP inhibitor (MTPX) or a placebo (P). MTPX injection resulted in a large (p < 0.01) liver triacylglycerol (TAG) accumulation in SD and HF-fed rats (approximately 200 mg g(-1)), irrespective of the training status, while plasma TAG levels were largely (approximately 80%) decreased (p < 0.01). MTPX injection in HF but not in SD-fed animals resulted in an increase in BiP/GRP78, ATF6, PERK, and XBP-1 mRNA levels, (p < 0.01) indicating an increase in the unfolding protein response (UPR) to ER stress. Interestingly, exercise training in rats fed the HF diet resulted in a further increase in BiP/GRP78 and XBP-1 mRNA levels in MTPX animals (p < 0.01). It is concluded that: (1) ER stress induced by MTPX occurs only in HF-fed rats despite the fact that liver TAG levels were largely increased in both dietary models; (2) the increase in gene expression of UPR markers with training may constitute a protective mechanism against ER stress in liver. |
| File Format | HTM / HTML |
| ISSN | 02636484 |
| Issue Number | 3 |
| Volume Number | 28 |
| e-ISSN | 10990844 |
| Journal | Cell Biochemistry and Function |
| Language | English |
| Publisher | Wiley-Blackwell |
| Publisher Date | 2010-04-01 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Cell Biology Discipline Biochemistry Carrier Proteins Antagonists & Inhibitors Dietary Fats Endoplasmic Reticulum Metabolism Heat-shock Proteins Liver Physical Conditioning, Animal Physiology Animals Biological Markers Body Composition Diet Energy Metabolism Female Gene Expression Genetics Humans Cytology Placebos Rats Rats, Sprague-dawley Triglycerides Blood Unfolded Protein Response Journal Article |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Medicine Biochemistry Clinical Biochemistry |
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