Abstract：
AIMS:We have demonstrated an important role of bone marrow-derived stem cells in preservation of myocardial function. We investigated whether Akt-1 of lin(-)c-kit(+) stem cells preserves ventricular function following myocardial infarction (MI). METHODS AND RESULTS:Isolated lin(-)c-kit(+) cells were conjugated with anti-c-kit heteroconjugated to anti-vascular cell adhesion molecule to facilitate the attachment of stem cells into damaged tissues. Female severe combined immunodeficient mice were used as recipients. MI was created by ligation of the left descending artery. After 48 h, animals were divided into four groups: (i) sham (n = 5): animals underwent thoracotomy without MI; (ii) MI (n = 5): animals underwent MI and received medium; (iii) MI + wild-type (Wt) stem cells (n = 6): MI animals received 5 x 10(5) Wt lin(-)c-kit(+) stem cells; (iv) MI + Akt-1(-/-) stem cells (n = 6): MI animals received 5 x 10(5) Akt-1(-/-) lin(-)c-kit(+) stem cells. Two weeks later, left ventricular function was measured in the Langendorff mode. The peripheral administration of Wt armed stem cells into MI animals restored ventricular function, which was absent in animals receiving Akt-1(-/-) cells. Real-time PCR indicates a decrease in SRY3, a Y chromosome marker in hearts receiving Akt-1(-/-) cells. An increase in angiogenic response was demonstrated in hearts receiving Wt stem cells but not Akt-1(-/-) stem cells. CONCLUSION:Our results demonstrate that the peripheral administration of Wt lin(-)c-kit(+) stem cells restores ventricular function and promotes angiogenic response following MI. These benefits were abrogated in MI mice receiving Akt-1(-/-) stem cells, suggesting the pivotal role of Akt-1 in mediating stem cells to protect MI hearts.
journal_name
Cardiovasc Resjournal_title
Cardiovascular researchauthors
Tseng A,Stabila J,McGonnigal B,Yano N,Yang MJ,Tseng YT,Davol PA,Lum LG,Padbury JF,Zhao TCdoi
10.1093/cvr/cvq110subject
Has Abstractpub_date
2010-09-01 00:00:00pages
704-12issue
4eissn
0008-6363issn
1755-3245pii
cvq110journal_volume
87pub_type
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