Triglycerides play a crucial role in the pathway from depression to cardiomyopathy: A mediation Mendelian randomization study

Q: What are the key findings of this study?

Depression increases ischemic heart disease risk (OR 1.019) and elevates triglycerides, with triglycerides mediating 100% of the depression-to-dilated cardiomyopathy causal pathway.

Q: What is the clinical evidence from this study?

Study design: Observational. Population: Cardiomyopathy (Ischemic Heart Disease and Dilated Cardiomyopathy) and Depression. Intervention: Depression vs. Lower genetic liability to or absence of depression. Primary outcome: Incidence of ischemic heart disease (IHD) (OR 1.019, 95% CI 1.011-1.026, p=<0.001).

Q: What question did this study set out to answer?

To determine the causal pathways linking depression, elevated triglyceride levels, and cardiomyopathy subtypes, specifically ischemic heart disease and dilated cardiomyopathy.

Boyang Sheng; Shina Zhang; Yuan Gao; Shuaishuai XIA; Ying Chen; Junfeng Yan

doi:10.1097/md.0000000000047424

February 13, 2026MedicineOpen Access

Triglycerides play a crucial role in the pathway from depression to cardiomyopathy: A mediation Mendelian randomization study

View Full Paper

Ask AI

Bookmark

Share

Key result

Depression linked to ~2% higher IHD risk, with triglycerides mediating downstream DCM risk.

OR 1.019
95% CI 1.011-1.026
P<0.001

Figures

Why the study?

The causal relationships among depression, hypertriglyceridemia, and cardiomyopathy remain undefined.

Does genetic predisposition to depression increase the risk of ischemic heart disease and dilated cardiomyopathy, and is this effect mediated by triglycerides?

Key Points

To determine the causal pathways linking depression, elevated triglyceride levels, and cardiomyopathy subtypes, specifically ischemic heart disease and dilated cardiomyopathy.
Extracted genetic variants for depression from the Psychiatric Genomics Consortium (50 SNPs) and for triglycerides from the UK Biobank (313 SNPs).
Evaluated causal relationships using univariable Mendelian randomization approaches including inverse variance weighted, MR-Egger, weighted median, and maximum likelihood estimation.
Conducted stepwise testing and multivariable Mendelian randomization to determine the mediating proportions of triglycerides between depression and cardiomyopathy outcomes.
Depression genetically predicted an elevation in triglyceride levels (OR: 1.093, 95% CI: 1.041–1.149, P < .001) and an increased risk of ischemic heart disease (OR: 1.019, 95% CI: 1.011–1.026, P < .001), but showed no direct causal link to dilated cardiomyopathy (OR: 1.181, 95% CI: 0.807–1.728, P = .392).
Elevated triglycerides causally augmented the risk of both ischemic heart disease (OR: 1.019, 95% CI: 1.015–1.023, P < .001) and dilated cardiomyopathy (OR: 1.240, 95% CI: 1.047–1.469, P = .013).
Triglycerides fully mediated the causal relationship between depression and dilated cardiomyopathy with a 100% mediation effect, while accounting for an 8.4% mediation proportion in the pathway between depression and ischemic heart disease.

Study Design

Type

Observational

Multicenter

Yes

Structured PICO

Does genetic predisposition to depression increase the risk of ischemic heart disease and dilated cardiomyopathy, and is this effect mediated by triglycerides?

P

Population

Large-scale Mendelian randomization study utilizing genome-wide association data from hundreds of thousands of European individuals to assess the causal interplay between depression, triglycerides, and cardiomyopathy.

E

Exposure

Genetic instrumental variables (single-nucleotide polymorphisms) proxying for depression and triglyceride levels

O

Outcome

Causal risk of ischemic heart disease (IHD) and dilated cardiomyopathy (DCM), and the mediating proportion of triglycerides in these pathwayshard clinical

Main Result

Odds Ratio: 1.019 (95% CI 1.011–1.026)

p-value: p=<0.001

Triglycerides play a significant mediating role in the causal pathways from depression to both ischemic heart disease and dilated cardiomyopathy, suggesting that lipid-lowering therapies may mitigate cardiovascular progression in patients with depression.

Limitations

Unable to examine potential for exposure-mediator interactions
Absence of publicly accessible source data prevents assessing biases from sample overlap
Analysis confined to individuals of European ancestry, limiting generalizability to other ethnicities
Does not examine the potential for exposure-mediator interactions
Absence of publicly accessible source data precludes ability to ascertain potential biases arising from sample overlap
Analysis confined to individuals of European ancestry, requiring further research for other ethnicities

Implication

Supports lipid monitoring in depression; leaves open whether triglyceride reduction prevents cardiomyopathy.

Abstract

The causal relationships among depression, hypertriglyceridemia, and cardiomyopathy remain undefined. Cardiomyopathy encompasses both ischemic heart disease (IHD) and dilated cardiomyopathy (DCM). Inverse variance weighted random-effect, inverse variance weighted fixed-effect, maximum likelihood estimation, MR-Egger, weighted median, and penalized weighted median were employed to evaluate the causal relationship between exposure and outcome. Stepwise testing and multivariable Mendelian randomization analyses were employed in the mediation analysis. The onset of depression precipitates an increase in triglyceride levels, which in turn escalates the risk of developing DCM. The onset of depression not only directly escalates the risk of developing IHD but also indirectly amplifies this risk by elevating triglyceride levels. Exacerbation of depression was observed to lead to an elevation in triglyceride levels (odds ratio [OR]: 1.093, 95% confidence interval [CI]: 1.041–1.149, P < .001). There was no direct causal link established between depression and DCM ( P = .392). The incidence of depression was associated with an increased risk of developing IHD (OR: 1.019, 95% CI: 1.011–1.026, P < .001). Elevated triglyceride levels were found to augment the risk of both IHD (OR: 1.019, 95% CI: 1.015–1.023, P < .001) and DCM (OR: 1.240, 95% CI: 1.047–1.469, P = .013). In the causal pathway between depression and DCM, triglycerides were found to mediate 100% of the effect. In the relationship between depression and IHD, triglycerides accounted for a mediation proportion of 8.4%.

Discussion

No takes yet. Share an insight, caveat, or question.

Cite This Study

Sheng et al. (2026) conducted an observational in Cardiomyopathy (Ischemic Heart Disease and Dilated Cardiomyopathy) and Depression. Depression vs. Lower genetic liability to or absence of depression was evaluated on Incidence of ischemic heart disease (IHD) (OR 1.019, 95% CI 1.011-1.026, p=<0.001). Depression increases ischemic heart disease risk (OR 1.019) and elevates triglycerides, with triglycerides mediating 100% of the depression-to-dilated cardiomyopathy causal pathway.

synapsesocial.com/papers/6992b45f9b75e639e9b094db https://doi.org/10.1097/md.0000000000047424

Topics

Cardiomyopathy

Women and heart disease

View Full Paper

Ask AI

Bookmark

Share

Triglycerides play a crucial role in the pathway from depression to cardiomyopathy: A mediation Mendelian randomization study

Figures

Key Points

Study Design

Structured PICO

Main Result

Limitations

Implication

Abstract

Discussion

Cite This Study

Topics

Triglycerides play a crucial role in the pathway from depression to cardiomyopathy: A mediation Mendelian randomization study

Figures

Key Points

Study Design

Structured PICO

Main Result

Limitations

Implication

Abstract

Discussion

Cite This Study

Keep reading

Topics

Keep reading