Breast cancer drug harms fish immunity, algae extract helps
Li W, Peng W, Chen W, Tang J, Zhou X
Medicinal Plants
The astaxanthin that showed up as a protective shield in this study comes from microalgae, the same tiny aquatic plants researchers are mining for antioxidant compounds that show up in everything from koi food to human supplements.
Researchers exposed baby zebrafish to a human breast cancer drug and found it shrank their immune cells and stem cells by quieting a cell-communication pathway called Wnt. When they added astaxanthin, a reddish pigment made by certain algae, it blunted much of that damage, hinting at a protective role for this plant-adjacent compound.
Key Findings
Exemestane exposure (0.9–2.7 mg/L) caused dose-dependent drops in hematopoietic stem cells, neutrophils, macrophages, and thymic T cells in zebrafish larvae
Treated fish showed increased oxidative stress, more apoptotic cells, and developmental defects (shorter body length, enlarged yolk sac)
Astaxanthin and the Wnt-pathway activator BML-284 both reduced the immunotoxic effects, pointing to Wnt signaling suppression as the underlying mechanism
chevron_right Technical Summary
Scientists found that exemestane, a breast cancer drug, damages immune cells and stem cells in developing zebrafish by blocking a key growth signal called Wnt, but an antioxidant called astaxanthin (derived from algae) helped protect against the damage.
Abstract Preview
Original paper
Exemestane induces a reduction in hematopoietic stem cells and immunotoxicity in zebrafish larvae by downregulating Wnt signaling pathway.
Exemestane is a third-generation aromatase inhibitor commonly prescribed for estrogen-dependent breast cancer. Given the widespread clinical use of exemestane, various adverse reactions have been r...
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Algae are any of a large and diverse group of photosynthetic organisms. It excludes the land plants (embryophytes). Such organisms range from microscopic unicellular microalgae to seaweeds, multicellular macroalgae which may grow up to 50 metres (160 ft) in length. Most algae are aquatic, and som...