Researchers uncover a hormone that plays a vital role in heart development

Researchers uncover a hormone that plays a vital role in heart development
The ELABELA hormone is important for heart development in the early embryo. Zebrafish embryos lacking ELABELA display a range of severe cardiac and other developmental anomalies (bottom) unlike those that express the hormone (top). Credit: Elsevier

Hormones—regulatory biochemicals produced by the body—were first identified over 100 years ago. Since then, improvements in researchers' understanding of the key role that hormones play as chemical messengers in processes such as growth, metabolism and reproduction have enabled some of the most significant medical advances in the twentieth century. The discovery of insulin, for example, led to the first effective treatment for diabetes, and the identification of other hormones, such as cortisol, estrogen, progesterone and testosterone, has resulted in unprecedented advances in human fertility and healthcare.

Now, a team of researchers from the Human Genetics and Embryology Laboratory at A*STAR's Institute of Medical Biology (IMB) and Institute of Molecular and Cell Biology has uncovered a new that plays an essential role during embryonic heart development. Known as ELABELA, the novel hormone opens up new avenues for the treatment of hypertension, cardiovascular disorders and even HIV infection.

In addition to being a breakthrough for biomedicine, the team's discovery highlights the importance of carefully decrypting sequenced genomes for possible hidden gems. "Although the human genome was completely sequenced and assembled a decade ago, it is bewildering that hitherto unknown hormones are still being discovered," says Bruno Reversade, the senior principal investigator at the IMB who led the research team.

Located on human chromosome 4, the gene ELABELA encodes a small secreted peptide hormone consisting of just 32 amino acids. Reversade and his team determined that in zebrafish lacking the ELABELA hormone, was significantly impeded or, in some cases, stopped completely (see image)—a finding that has since been replicated by researchers at Harvard University in the United States.

Reversade's team showed that the ELABELA hormone binds to a specific protein found on the surface of cells known as the apelin receptor. Prior to the finding, scientists thought that the apelin receptor could only be activated by the APELIN hormone, which plays multiple roles in the body, influencing, among other essential metabolic functions: myocardial contractility (the intrinsic ability of the heart to contract); the regulation of blood pressure, water and food intake; the release of hormones from the pituitary gland; and bone development.

So far, the team has demonstrated that ELABELA is present in human embryonic stem cells and is also expressed in the adult human prostate and kidney. The researchers' next step will be to investigate ELABELA's role in a wider range of organs and tissues. If ELABELA is shown to signal through the apelin receptor in adults as well, the newly discovered hormone could have beneficial effects similar to those of APELIN. The hormone may even block HIV entry to the cell since the apelin receptor is one gateway for viral entry into human cells.

"This discovery shows great promise for the development of targeted therapies for heart disease and blood pressure control in the future," notes Birgit Lane, executive director of the IMB. "It is an excellent example of how basic research can lead to surprising and unexpected findings that may change and refine medical practice."

More information: Chng, S. C., Ho, L., Tian, J. & Reversade, B. ELABELA: "A hormone essential for heart development signals via the apelin receptor." Developmental Cell 27, 672–680 (2013). dx.doi.org/10.1016/j.devcel.2013.11.002

add to favorites email to friend print save as pdf

Related Stories

Novel hormone essential for heart development discovered

Dec 06, 2013

Scientists at A*STAR's Institute of Medical Biology (IMB) and Institute of Molecular and Cellular Biology (IMCB) have identified a gene encoding a hormone that could potentially be used as a therapeutic molecule to treat ...

Apelin hormone injections powerfully lower blood sugar

Nov 04, 2008

By injecting a hormone produced by fat and other tissues into mice, researchers report in the November Cell Metabolism that they significantly lowered blood sugar levels in normal and obese mice. The findings suggest that t ...

Researchers grow pituitary glands from embryonic stem cells

Nov 10, 2011

(Medical Xpress) -- A new study published in Nature reports that scientists have been able to grow working pituitary glands from embryonic stem cells from mice. When these were transplanted into mice with defects in the pi ...

Understanding the APJ Receptor Binding Site

Jun 01, 2010

(PhysOrg.com) -- Apelin is a recently discovered peptide that binds to the apelin (or APJ) G-protein-coupled receptor. Apelin-13 (NH2-QRPRLSHKGPMPF-COOH), one of several cleavage products of the proprotein ...

New class of drug targets heart disease

Sep 17, 2013

(Edmonton) Researchers at the University of Alberta have developed a synthetic peptide that could be the first in a new class of drugs to treat heart disease, high blood pressure and diabetes.

Recommended for you

Connection found between birth size and brain disorders

11 hours ago

(Medical Xpress)—A trio of researchers has found what appears to be a clear connection between birth size and weight, and the two brain disorders, autism and schizophrenia. In their paper published in Proceedings of ...

A novel therapy for sepsis?

Sep 16, 2014

A University of Tokyo research group has discovered that pentatraxin 3 (PTX3), a protein that helps the innate immune system target invaders such as bacteria and viruses, can reduce mortality of mice suffering ...

User comments