Diabetic kidney disease research is revealing important biological clues about how diabetes gradually damages the kidneys. A research team at the Icahn School of Medicine at Mount Sinai identified a cellular pathway involving mitochondrial stress, oxidative damage, and communication between specialized kidney cells.
The findings may eventually support the development of earlier diagnostic tests and more targeted treatments for diabetic kidney disease. This is especially important because kidney damage may progress for years before a person develops noticeable symptoms.
Diabetes is one of the leading causes of chronic kidney disease and kidney failure. Persistently high blood sugar can damage the small blood vessels and filtering structures inside the kidneys. Once kidney function declines severely, patients may require dialysis or a kidney transplant to survive.
The Mount Sinai findings offer a closer look at how this damage may begin and identify a receptor that could potentially be targeted to slow or prevent disease progression.
Diabetic Kidney Disease Research Reveals Hidden Damage
The kidneys are responsible for filtering waste products and excess fluid from the blood. They also help regulate blood pressure, maintain mineral balance, support red blood cell production, and keep the body’s internal environment stable.
Each kidney contains approximately one million microscopic filtering units called nephrons. Inside every nephron is a cluster of tiny blood vessels known as the glomerulus.
The glomerulus acts as the first stage of blood filtration. It allows water and waste products to pass into the urine while keeping blood cells and important proteins in circulation.
Researchers focused on three different cell types that interact inside the glomerulus. These included endothelial cells, which form the inner lining of blood vessels, and podocytes, specialized cells that wrap around the glomerular capillaries.
When these cells are healthy, they work together to maintain a strong and selective filtration barrier. When one cell type becomes damaged, however, harmful signals may spread to nearby cells and weaken the entire structure.
This damage may eventually cause albumin and other important proteins to leak from the blood into the urine. Protein in the urine is often one of the first measurable signs of diabetic kidney disease.
How Mitochondrial Stress Affects Kidney Cells
The Mount Sinai research team examined two groups of mice. One group was genetically susceptible to developing diabetic kidney disease, while the other group was naturally resistant to it.
Researchers discovered that the susceptible mice developed stress inside the mitochondria of their glomerular endothelial cells.
Mitochondria are small structures inside cells that produce energy. They are frequently described as the power plants of the cell because they help convert nutrients into usable cellular energy.
However, mitochondria can become damaged when they are exposed to persistently high blood sugar and other metabolic changes associated with diabetes.
In the disease-prone mice, stressed mitochondria produced excessive quantities of reactive oxygen species, also known as ROS. Reactive oxygen species are unstable molecules that are naturally generated during normal cellular activity.
Small amounts of ROS play a role in cell signaling and immune function. Excessive amounts, however, can damage proteins, cell membranes, and DNA.
An imbalance between reactive oxygen species and the body’s antioxidant defenses is known as oxidative stress. The study suggests that this oxidative stress may begin early in the development of diabetic kidney damage.
Instead of being only a consequence of advanced kidney disease, mitochondrial stress may actively contribute to the disease process.
Harmful Communication Between Kidney Cells
One of the most important findings involved communication between the different cells inside the glomerulus.
The oxidative stress did not remain limited to the endothelial cells. Harmful signals produced by the stressed cells also affected nearby podocytes.
Podocytes play an essential role in preventing protein from leaking into the urine. These cells have small extensions that wrap around glomerular capillaries and help form the kidney’s filtration barrier.
When podocytes become damaged or are lost, the glomerulus becomes increasingly fragile. Capillaries may collapse, scar tissue may develop, and the kidney may become unable to filter blood properly.
This process can cause increasing levels of proteinuria, which means excess protein is being lost in the urine.
Persistent proteinuria can be a sign that diabetic kidney disease is progressing. As kidney damage continues, the estimated glomerular filtration rate, or eGFR, may begin to decline.
The research demonstrates that diabetic kidney damage may involve a chain reaction. Stress begins in one cell type, spreads to neighboring cells, weakens the filtration barrier, and eventually contributes to kidney failure.
Diabetic Kidney Disease Research Identifies a Treatment Target
Researchers also looked for signals controlling mitochondrial stress in the glomerular endothelial cells.
They identified increased activity involving a signaling protein called endothelin-1 and a cellular receptor known as endothelin receptor type A, or EDNRA.
A receptor is a structure on or inside a cell that responds when a specific molecule binds to it. When endothelin-1 binds to endothelin receptor type A, it can influence blood vessel function, inflammation, cellular stress, and tissue damage.
The investigators tested an experimental molecule called BQ-123. This compound was designed to block endothelin receptor type A and prevent endothelin-1 from activating it.
When the receptor was blocked, mitochondrial oxidative stress was reduced. The mice that were genetically destined to develop diabetic kidney disease were protected from much of the expected kidney damage.
This result suggests that the endothelin pathway may represent a potential treatment target.
However, BQ-123 is an experimental research compound and is not an established treatment for diabetic kidney disease. Results from animal studies cannot automatically be applied to people.
Additional studies would be needed to determine whether similar receptor-blocking treatments are safe, effective, and practical for human patients.
The Potential for Earlier Detection
Diabetic kidney disease research may also improve the way kidney damage is detected.
Researchers measured molecules associated with oxidative stress in the susceptible mice. This raised the possibility that similar molecules could serve as biomarkers in people.
A biomarker is a measurable biological substance or change that helps identify the presence, severity, or progression of a disease.
The investigators examined urine and kidney biopsy samples from patients with diabetic kidney disease. They found evidence of increased oxidative stress, mitochondrial DNA damage, and increased expression of endothelin receptor type A.
These findings supported the biological pathway observed in the animal models.
In the future, a urine or blood test might identify signs of mitochondrial stress before major kidney damage develops. Earlier detection could allow patients and physicians to begin protective treatment sooner.
Current screening generally relies on two important tests. A urine albumin-to-creatinine ratio checks for albumin leakage, while a blood creatinine test is used to calculate eGFR.
People with diabetes should receive kidney testing according to the schedule recommended by their healthcare providers, even when they feel well.
Kidney disease can progress silently, so the absence of symptoms does not necessarily mean the kidneys are healthy.
Protecting Kidney Function Today
Although these findings may guide future treatments, established kidney-protection strategies remain essential.
Managing blood sugar is one of the most important steps for reducing ongoing damage to the small blood vessels inside the kidneys. Patients should work with their healthcare teams to develop individualized blood sugar goals.
Blood pressure control is equally important. High blood pressure increases pressure inside the kidney’s filtering vessels and may accelerate protein leakage and scarring.
Depending on a patient’s condition, a physician may prescribe medications that lower blood pressure and provide additional kidney protection.
Regular kidney function testing can help detect changes in urine albumin, creatinine, potassium, and eGFR. Cholesterol management, smoking cessation, physical activity, and maintaining a healthy weight may also support cardiovascular and kidney health.
Patients should review over-the-counter medications and dietary supplements with their healthcare providers. Some medications, including frequent or high-dose use of certain nonsteroidal anti-inflammatory drugs, may worsen kidney function in susceptible individuals.
People with advanced kidney disease may also require individualized guidance regarding sodium, potassium, phosphorus, protein, and fluid intake.
Diabetic Kidney Disease Research Offers New Hope
The Mount Sinai study provides a clearer understanding of how diabetic kidney injury may begin at the cellular level.
Mitochondrial stress in glomerular endothelial cells can produce excess reactive oxygen species. These unstable molecules may damage endothelial cells, injure podocytes, weaken the filtration barrier, and contribute to protein leakage.
Researchers also identified endothelin receptor type A as an important part of this damaging pathway. Blocking the receptor reduced oxidative stress and protected susceptible mice from diabetic kidney damage.
Diabetic kidney disease research may eventually lead to tests that detect harmful cellular changes before a substantial amount of kidney function is lost. It may also support treatments designed to block specific pathways rather than simply managing the consequences of advanced disease.
These discoveries are promising, but more research is necessary before experimental findings become approved human treatments.
For now, early screening remains one of the most effective tools available. People with diabetes should regularly monitor their kidney function, blood pressure, blood sugar, and urine albumin levels.
Combining scientific advances with established preventive care may provide the best opportunity to slow diabetic kidney disease and reduce the risk of kidney failure.
