Featured Research

from universities, journals, and other organizations

Insulin therapy may help repair atherosclerotic lesions in diabetic patients

Date:
January 19, 2012
Source:
Elsevier Health Sciences
Summary:
New research reveals that insulin applied in therapeutic doses selectively stimulates the formation of new elastic fibers in cultures of human aortic smooth muscle cells. These results advance the understanding of the molecular and cellular mechanisms of diabetic vascular disease.

New research reveals that insulin applied in therapeutic doses selectively stimulates the formation of new elastic fibers in cultures of human aortic smooth muscle cells. These results advance the understanding of the molecular and cellular mechanisms of diabetic vascular disease. The study is published in the February issue of The American Journal of Pathology.

Related Articles


"Our results particularly endorse the use of insulin therapy for the treatment of atherosclerotic lesions in patients with type I diabetes, in which the induction of new elastic fibers would mechanically stabilize the developing plaques and prevent arterial occlusions," explained lead investigator Aleksander Hinek, MD, PhD, DSc, Professor, Division of Cardiovascular Research, The Hospital for Sick Children and the Department of Laboratory Medicine and Pathobiology, University of Toronto.

Primary insulin deficiency and decreased cellular sensitivity to insulin have been implicated in the pathogenesis of impaired healing processes, atherosclerosis and hypertension, all frequently observed in patients with both type I and type II diabetes. However, the possibility of a direct contribution of insulin to the cellular and molecular mechanisms that control the production of elastic fibers (elastogenesis) has not been explored. The researchers conducted a series of experiments to determine whether low therapeutic concentrations of insulin would promote the production of elastic fibers in cultures of human aortic smooth muscle cells.

Investigators found that insulin does in fact stimulate the deposition of elastic fibers in cultures of human aortic smooth muscle cells. The data demonstrated, for the first time, that low doses of insulin induce the elastogenic effect solely through the activation of insulin receptor and trigger the downstream activation of the P13K signaling pathway. The ultimate up-regulation of elastic fiber deposition by insulin is executed through two parallel mechanisms: the initiation of elastin gene expression and the enhancement of tropoelastin secretion.

Importantly, the experimental data suggest that insulin-dependent initiation of the elastin gene transcription occurs after dissociation of the FoxO1 transcription factor from the specific domain identified within the elastin gene promoter. The researchers also demonstrated that insulin may facilitate the transportation of tropoelastin into the secretory endosomes, where it can associate with S-GAL/EBP, the "chaperone" protein that enhances secretion.

"We believe that our discovery of the elastogenic action of insulin allows for better understanding of the pathologic mechanisms in which the lack of insulin, in diabetes type I, or insulin resistance, in diabetes type II, contribute to the development of hypertension and the rapid progression of atherosclerosis," concluded Dr. Hinek.

Dr. Hinek further elaborated on the far-reaching effects these data provide: "Importantly, our newest results indicate that the discovered elastogenic effect of low concentrations (0.5-10 nM) of insulin is not restricted to the arterial smooth muscle cells. Thus, insulin also stimulates formation of elastic fibers by human skin fibroblasts and by myofibroblasts isolated from human hearts. These observations constitute a real novelty in the field of regenerative medicine and endorse 1) local application of small doses of insulin for ameliorating difficult healing of dermal wounds in diabetic patients and 2) systemic administration of insulin in patients after heart infarctions, in hope that insulin-induced elastic fiber deposition may alleviate formation of maladaptive collagenous scars in the myocardium."


Story Source:

The above story is based on materials provided by Elsevier Health Sciences. Note: Materials may be edited for content and length.


Journal Reference:

  1. Junyan Shi, Andrew Wang, Sanjana Sen, Yanting Wang, Hyunjun J. Kim, Thomas F. Mitts, Aleksander Hinek. Insulin Induces Production of New Elastin in Cultures of Human Aortic Smooth Muscle Cells. The American Journal of Pathology, 2012; DOI: 10.1016/j.ajpath.2011.10.022

Cite This Page:

Elsevier Health Sciences. "Insulin therapy may help repair atherosclerotic lesions in diabetic patients." ScienceDaily. ScienceDaily, 19 January 2012. <www.sciencedaily.com/releases/2012/01/120109145734.htm>.
Elsevier Health Sciences. (2012, January 19). Insulin therapy may help repair atherosclerotic lesions in diabetic patients. ScienceDaily. Retrieved December 19, 2014 from www.sciencedaily.com/releases/2012/01/120109145734.htm
Elsevier Health Sciences. "Insulin therapy may help repair atherosclerotic lesions in diabetic patients." ScienceDaily. www.sciencedaily.com/releases/2012/01/120109145734.htm (accessed December 19, 2014).

Share This


More From ScienceDaily



More Health & Medicine News

Friday, December 19, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Kids Die While Under Protective Services

Kids Die While Under Protective Services

AP (Dec. 18, 2014) As part of a six-month investigation of child maltreatment deaths, the AP found that hundreds of deaths from horrific abuse and neglect could have been prevented. AP's Haven Daley reports. (Dec. 18) Video provided by AP
Powered by NewsLook.com
Dads-To-Be Also Experience Hormone Changes During Pregnancy

Dads-To-Be Also Experience Hormone Changes During Pregnancy

Newsy (Dec. 18, 2014) A study from University of Michigan researchers found that expectant fathers see a decrease in testosterone as the baby's birth draws near. Video provided by Newsy
Powered by NewsLook.com
Prenatal Exposure To Pollution Might Increase Autism Risk

Prenatal Exposure To Pollution Might Increase Autism Risk

Newsy (Dec. 18, 2014) Harvard researchers found children whose mothers were exposed to high pollution levels in the third trimester were twice as likely to develop autism. Video provided by Newsy
Powered by NewsLook.com
UN: Up to One Million Facing Hunger in Ebola-Hit Countries

UN: Up to One Million Facing Hunger in Ebola-Hit Countries

AFP (Dec. 17, 2014) Border closures, quarantines and crop losses in West African nations battling the Ebola virus could lead to as many as one million people going hungry, UN food agencies said on Wednesday. Duration: 00:52 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Health & Medicine

Mind & Brain

Living & Well

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins