Bitter gourd plant compound curbs lung scarring in mice
Kang HX, Fu YF, Ti HB, Wu H, Wu JJ
Medicinal Plants
The intensely bitter compound that makes bitter melon and wild cucumber vines unpalatable to browsing animals turns out to calm the exact immune signaling that drives scar tissue in damaged lungs.
Cucurbitacin B is a bitter-tasting compound made by plants in the cucumber and cabbage families, including bitter melon, as a natural defense chemical. Researchers gave it to mice with a drug-induced lung injury and found it blocked certain immune cells from flipping into a mode that lays down scar tissue, which kept the lungs healthier. It works by switching off a specific internal signal (PI3K/Akt/mTOR) that those immune cells need to make that switch.
Key Findings
Cucurbitacin B reduced lung injury and collagen (scar tissue) buildup in mice with bleomycin-induced pulmonary fibrosis
The compound suppressed M2 macrophage polarization and cut down profibrotic signaling between macrophages and fibroblasts
Mechanism traced to inhibition of PI3K/Akt/mTOR phosphorylation; PI3K/mTOR inhibitors reproduced the effect while an Akt agonist partially reversed it
chevron_right Technical Summary
A compound from bitter gourd and related plants reduced lung scarring in mice by blocking immune cells from switching into a mode that drives fibrosis. The finding points to a possible new treatment approach for pulmonary fibrosis, a lung disease with few good drug options.
Abstract Preview
Original paper
Cucurbitacin B attenuates bleomycin-induced pulmonary fibrosis by inhibiting M2 macrophage polarization via PI3K/AKT/mTOR signaling.
Pulmonary fibrosis is a progressive interstitial lung disease with high mortality and few effective therapies. A key feature of this process is the persistent activation of M2 macrophages, which pr...
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Momordica charantia is a tropical and subtropical vine of the family Cucurbitaceae, widely grown in Asia, Africa, and the Caribbean for its edible fruit. Its many varieties differ substantially in the shape and bitterness of the fruit.