Ji Li and his colleagues are learning how aging may impair the
heart's ability to respond to stress caused by ischemia.
Ji
Li, PhD, assistant professor of pharmacology
and toxicology, has received a $198,000 grant from the Founders
Affiliate of the American
Heart Association to study a novel signaling pathway that, when
activated, helps protect the heart from damage caused by
ischemia.
“This research has the potential to discover new
therapeutic strategies to limit myocardial dysfunction in the
elderly,” Li says.
Li and collaborators from Yale University hypothesize that aging
is associated with a decline in the ability of cardiac cells to
render the MIF-AMPK signaling cascade active in response to
ischemia and reperfusion, thus resulting in exacerbated
injury.
Through their latest project, they will further explore the
physiological role of this cardioprotective signaling response and
how aging may impair it.
They will also seek to better understand the overall
relationship between aging and ischemic heart disease, toward the
goal of providing novel strategies for improving clinical outcomes
in elderly patients.
Ischemic heart disease, which leads to myocardial damage,
affects approximately 1 million Americans each year, and older
people are most at risk. Those older than 70 are more likely to die
following myocardial infarction, coronary angioplasty or cardiac
surgery.
“Evidence now shows that there is an impaired
cardioprotective signaling response to ischemia in the aged heart
that leads to an increased susceptibility to myocardial infarction
in the elderly,” says Li.