Abstract:
BACKGROUND:Human obesity has been associated with alterations of vascular structure, especially in large and medium arteries, but the effects of insulin-sensitizers are not well known. METHODS:Twenty-five male Wistar rats received subcutaneous injections of monosodium glutamate (MSG) or an equivalent volume of vehicle from the second to the sixth day after birth, At 16 weeks of age, five MSG rats started receiving an oral treatment with metformin (300 mg/kg) which was maintained for six weeks, composing five groups: control 16 weeks (CON-16), MSG 16 weeks (MSG-16), control 22 weeks (CON-22), MSG 22 weeks (MSG-22), and MSG plus metformin 22 weeks (MET-22). Systolic blood pressure (BP) was verified weekly. The lumen diameter and media thickness, media cross-sectional area (CSA) and growth index of the intramyocardial arterioles were measured. Cardiac interstitial and perivascular collagen density were also evaluated. RESULTS:Systolic BP was significantly increased in the MSG-22 comparing to MSG-16 group. Insulin resistance was confirmed by HOMA-IR index and metformin-treated group presented reduction of insulin levels at week 22. The morphology analysis showed greater media-to-lumen ratio and CSA in the obese groups, which were reduced by the metformin treatment. Connective tissue deposition in the perivascular region of the left ventricle was significantly higher in the obese groups which was attenuated by metformin. CONCLUSIONS:Hypertrophic vascular remodeling and cardiac collagen deposition were significantly evident in MSG-induced obese rats. Metformin treatment was able to reduce insulin resistance and attenuated this adverse cardiac and vascular remodeling.
journal_name
Int J Cardioljournal_title
International journal of cardiologyauthors
Burlá AK,Lobato NS,Fortes ZB,Oigman W,Neves MFdoi
10.1016/j.ijcard.2011.09.012subject
Has Abstractpub_date
2013-05-25 00:00:00pages
483-7issue
3eissn
0167-5273issn
1874-1754pii
S0167-5273(11)01723-2journal_volume
165pub_type
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