Study summary · research use only
Hexarelin attenuates abdominal aortic aneurysm formation by inhibiting SMC phenotype switch and inflammasome activation
Plain-language summary
Paraphrased from the published abstract below — not a verdict on whether anything works.
This study in a mouse model of elastase-induced abdominal aortic aneurysm (AAA) tested hexarelin, a synthetic growth hormone-releasing peptide, administered at 200 μg/kg twice per day. The abstract reports hexarelin was associated with decreased infrarenal aorta diameter on echocardiography and in situ imaging, improved elastin preservation on histology, increased α-SMA and decreased MMP2 in smooth muscle cells, and reduced inflammatory cell infiltration, NLRP3 inflammasome activation, and IL-18 production. Hexarelin was also linked to suppression of NF-κB signaling. The authors describe these findings as showing hexarelin attenuated AAA development in this model by affecting smooth muscle cell phenotype and NF-κB-mediated inflammation.
Abstract
Hexarelin, a synthetic growth hormone-releasing peptide, is shown to be protective in cardiovascular diseases such as myocardial infraction and atherosclerosis. However, the functional role of hexarelin in abdominal aortic aneurysm (AAA) remains undefined. The present study determined the effect of hexarelin administration (200 μg/kg twice per day) in a mouse model of elastase-induced abdominal aortic aneurysm. Echocardiography and in situ pictures showed hexarelin decreased infrarenal aorta diameter. Histology staining showed elastin degradation was improved in hexarelin-treated group. Hexarelin rescued smooth muscle cell contractile phenotype with increased α-SMA and decreased MMP2. Furthermore, hexarelin inhibited inflammatory cell infiltration, NLRP3 inflammasome activation and IL-18 production. Particularly, hexarelin suppressed NF-κB signaling pathway which is a key initiator of inflammatory response. These results demonstrated that hexarelin attenuated AAA development by inhibiting SMC phenotype switch and NF-κB signaling mediated inflammatory response.
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