Aotearoa Latest Zealand researchers have identified a promising new molecular pathway that could pave the way for effective treatments for lymphoedema, a chronic and debilitating condition characterized by painful swelling. The discovery, made by scientists at the University of Auckland, centers around a molecule that promotes the growth of lymphatic vessels, offering a potential route to repair damage within the lymphatic system and alleviate symptoms for which there is currently no cure.
Lymphoedema, often a consequence of cancer treatment—particularly breast cancer—affects an estimated 20% of women in New Zealand who undergo lymph node removal as part of their care. The condition can as well arise from injury or be congenital, but its link to cancer treatment is particularly prevalent. The lymphatic system, responsible for fluid balance throughout the body, becomes compromised, leading to a buildup of fluid in tissues, most commonly in the arms and breasts. This swelling can cause physical discomfort, increase the risk of infection, and significantly impact quality of life.
A New Pathway to Lymphatic Growth
The research, led by Dr. Jonathan Astin, a senior lecturer in molecular medicine and pathology at the University of Auckland’s Faculty of Medical and Health Sciences, identified a key molecule – insulin-like growth factor, or IGF – and a related pathway that stimulate lymphatic vessel growth. “Our group of researchers has discovered a new molecule and pathway that together promote lymphatic vessel growth,” Dr. Astin explained. The initial discovery was made using zebrafish, a model organism frequently used in biological research due to its transparent embryos allowing for easy visualization of lymphatic development. Researchers were able to observe the effects of IGF on lymphatic vessel growth in real-time.
Importantly, the team then demonstrated that IGF also has a similar effect on human lymphatic cells grown in the laboratory. Dr. Justin Rustenhoven, a senior research fellow at the University, collaborated on this aspect of the study, confirming the potential for translation to human therapies. “This work is of interest to the medical community as it provides an additional way to induce lymphatic vessel growth,” Dr. Astin stated. The ability to stimulate lymphatic vessel growth is crucial, as it could offer a way to repair damaged vessels and restore lymphatic function in individuals with lymphoedema.
From Zebrafish to Human Cells
The choice of zebrafish as a starting point wasn’t arbitrary. “We use fish primarily because they’re very simple, but they’re still remarkably similar to us,” Dr. Astin explained. The transparency of zebrafish embryos allows researchers to fluorescently label lymphatic vessels, making it possible to directly observe vessel growth without disrupting the organism’s development. This allows for rapid observation of the effects of different molecules and pathways on lymphatic function. The speed of development in zebrafish also accelerates the research process.
The research team included Dr. Wenxuan Chen, formerly a doctoral student in Dr. Astin’s lab, along with collaborators Dr. Kate Lee and Professor Stefan Bohlander, all from the Faculty of Medical and Health Sciences. The project also involved a collaborative effort with a research lab in the United States.
Next Steps: Testing in Animal Models
The next crucial step in this research is to test an IGF-based therapy in mice with lymphoedema. This preclinical study will assess whether the therapy can effectively promote lymphatic vessel growth and reduce swelling in a living organism. If successful, this could pave the way for human clinical trials. The researchers are hopeful that this approach will offer a new treatment option for the many individuals affected by this challenging condition.
While a cure for lymphoedema remains elusive, this discovery represents a significant step forward in understanding the underlying mechanisms of the disease and developing potential therapies. The identification of IGF and its associated pathway provides a new target for drug development and offers hope for improved management and, potentially, even reversal of the condition’s debilitating effects.
Disclaimer: This article provides information for general knowledge and informational purposes only, and does not constitute medical advice. It is essential to consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatment.
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