How Mitochondria Shape Lab-Grown Insulin-Producing Cells

For decades, researchers have pursued a potential path to help people with Type 1 diabetes: growing replacement insulin-producing beta cells from stem cells in the laboratory. While islet transplantation—moving healthy beta cells from donors—can work, it faces a critical bottleneck: there simply aren't enough donor organs available.

Scientists believe that transplanting lab-grown beta cells could eventually solve this shortage. But current methods have a significant limitation: the beta cells created this way don't work quite as well as natural ones. Specifically, they don't release enough insulin when blood sugar rises, a process called glucose-stimulated insulin secretion (GSIS).

A team of researchers hypothesized that the problem might lie deeper than previously thought—inside the mitochondria, the tiny structures that power cells. During normal beta cell development, cells shift how they produce energy. Early on, they rely mainly on glycolysis, a fast but less efficient energy-making process. As beta cells mature, they increasingly depend on OXPHOS, a different energy pathway that's more efficient but more complex.

The researchers wondered: could this metabolic shift be the key to making better lab-grown beta cells? To find out, they tracked what happens to mitochondria during the entire process of converting stem cells into functional islet organoids—clusters of beta cells and supporting cells.

The team used two different stem cell lines and followed them through a six-stage differentiation protocol. At each stage, they measured markers to confirm the cells were progressing as expected. By the final stage, both cell lines successfully generated beta cells, identified by the presence of specific proteins (NKX6.1 and insulin).

Throughout the process, the researchers observed how mitochondria changed shape, number, and function. They measured how much energy came from different pathways and tracked the timing of mitochondrial development alongside other signs of beta cell maturation. The findings showed consistent patterns across both cell lines, suggesting the process may be reliable and repeatable.

The results point to mitochondrial development as an active, measurable part of how stem cells become fully functioning beta cells—not just a side effect, but potentially a requirement for success.

While this research doesn't immediately change diabetes treatment, it provides a clearer map of what healthy beta cell development looks like at the cellular level. Understanding the role of mitochondria during differentiation could help scientists refine protocols to grow better beta cells in the laboratory.

The next steps will likely involve testing whether enhancing mitochondrial function at specific stages could improve glucose-stimulated insulin secretion in lab-grown cells. If successful, such improvements could bring stem cell-derived beta cell transplantation closer to clinical use for people with Type 1 diabetes.

Source: Frontiers in endocrinology. Evidence type: PubMed indexed literature. Type1Cure is an information and intelligence hub, not a medical advice service. This article summarizes published research and does not provide diagnosis, treatment, or personal medical guidance. Always talk to your own care team before changing anything about your Type 1 diabetes management.