Dr. J. Michelle Kahlenberg, an expert in Rheumatology and cutaneous lupus, discusses photosensitivity in lupus patients and the surprising findings of their study on the regulation of photosensitivity by the Hippo Pathway in Lupus Skin. They also explore epigenetic modifications in lupus, the impact of gardening, navigating the Valley of Death in research, and the parallels between farm life and managing a research lab.
Epigenetic modifications in lupus patients' DNA contribute to photosensitivity and skin inflammation.
Activation of the hippo pathway in lupus keratinocytes leads to increased apoptosis and photosensitivity, offering new treatment possibilities.
Deep dives
Epigenetic Modifications in Lupus Skin
Epigenetic modifications in the DNA of keratinocytes in lupus patients result in more pro-inflammatory cells in the skin. These modifications are heritable, persistent, and contribute to increased photosensitivity and skin inflammation.
The Role of the Hippo Signaling Pathway
The hippo signaling pathway, primarily studied in cancer biology, plays a crucial role in determining whether cells proliferate or die. In lupus keratinocytes, the hippo pathway is activated, leading to increased apoptosis and photosensitivity. Abnormalities in the hippo pathway, including overexpression of WWC1 and increased phosphorylation of LATS1 and LATS2, contribute to the heightened apoptosis observed in lupus keratinocytes.
Potential Treatment and Future Research
Understanding the role of the hippo pathway in lupus photosensitivity may open up new treatment avenues beyond sunscreen. Inhibitors of the LATS kinase, a key component of the hippo pathway, are currently being investigated for potential use in lupus patients. Research on the impact of LATS inhibitors on disease activity and photosensitivity in a lupus model is ongoing.
Photosensitivity among patients with SLE is a well-known symptom. However, what is not well-known is why. Our guest this week, Dr. J. Michelle Kahlenberg MD, PhD and team, endeavored to uncover that answer. The article, “Regulation of Photosensitivity by the Hippo Pathway in Lupus Skin” was the result of this study, which was published in “Arthritis & Rheumatology” earlier this year. Dr. Kahlenberg joins us for this episode to discuss the study’s methods, results and its surprising conclusion: a novel driver was discovered!
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