# A novel mechanism of stromal cell-derived factor 1 protection against diabetic cardiomyopathy

> **NIH NIH R01** · UNIVERSITY OF LOUISVILLE · 2021 · $383,784

## Abstract

Diabetic cardiomyopathy (DCM) is one of the major chronic complications in diabetic patients. Conventional
therapies for treatment of DCM include glycemic control, management of hypertension, lowering lipid and
life-style management. However, there are no treatment strategies available that specifically target the
pathogenesis of DCM. Greater understanding of the pathogenic mechanism of DCM is needed to develop
improved therapeutic strategies.
Stromal cell-derived factor-1 (SDF-1) belongs to C-X-C motif chemokine family. It controls diverse cell
functions by interacting with its receptors, CXCR4 and CXCR7. Myocardial SDF-1 is transiently up-regulated
during ischemia or after infarction and can attract stem cells to the injury site contributing to cardiac
regeneration and angiogenesis. Exogenous SDF-1 can help prevent myocardial infarction and
ischemia/reperfusion injury through stem cell-dependent and -independent mechanisms. However, the role
and mechanism of the SDF-1-CXCR4/CXCR7 system in DCM has not been established.
Accumulating evidence indicates that diabetes-induced deficiency of growth factors such as SDF-1 is
associated with diabetic cardiovascular complications. In a preliminary study, the PI showed that the
expression of SDF-1 is notably down-regulated in the cardiac tissue of mice with type 1 and type 2 diabetes,
while the receptor expression levels are unaffected. The PI considered that lack of cardiac SDF-1 may
contribute to DCM and supplementary SDF-1 may provide direct cardiomyocyte protection. As an initial test
cultured cardiac cells were exposed to palmitate-mimicked diabetic lipotoxicity with SDF-1 pretreatment.
These studies showed that SDF-1 protected against palmitate-induced cell death via CXCR7-, but not
CXCR4-, mediated AMP-activated protein kinase (AMPK) activation. The results are of great significance
since they demonstrate SDF-1 can provide direct protection against diabetic cardiac cell death independent
of stem cells. Therefore, it is critical to determine if in vivo protection involves the same direct actions by
SDF-1 identified on isolated cardiomyocytes. Based on the critical role of CXCR4 and CXCR7 in
cardiovascular diseases, it is hypothesized that SDF-1 treatment of diabetic mice directly protects against
diabetes-induced cardiomyocyte death and cardiac remodeling via CXCR7-mediated activation of AMPK
and that SDF-1 treatment can ultimately prevent DCM.
This hypothesis will be tested through three specific aims: (1) to determine the direct cardiomyocyte effects
of SDF-1 in protection against DCM; (2) to determine whether SDF-1 signaling through CXCR7 mediates
protection against DCM, independently of CXCR4; (3) to determine whether AMPK mediates SDF-1/CXCR7
protection against DCM.
This project will provide fundamental evidence for the interaction of SDF-1-CXCR4 and/or -CXCR7 at the
cardiomyocyte as a new therapeutic target for the prevention of DCM in future clinical investigations.

## Key facts

- **NIH application ID:** 10139082
- **Project number:** 5R01HL125877-05
- **Recipient organization:** UNIVERSITY OF LOUISVILLE
- **Principal Investigator:** Yi Tan
- **Activity code:** R01 (R01, R21, SBIR, etc.)
- **Funding institute:** NIH
- **Fiscal year:** 2021
- **Award amount:** $383,784
- **Award type:** 5
- **Project period:** 2017-05-01 → 2023-02-28

## Primary source

NIH RePORTER: https://reporter.nih.gov/project-details/10139082

## Citation

> US National Institutes of Health, RePORTER application 10139082, A novel mechanism of stromal cell-derived factor 1 protection against diabetic cardiomyopathy (5R01HL125877-05). Retrieved via AI Analytics 2026-05-23 from https://api.ai-analytics.org/grant/nih/10139082. Licensed CC0.

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