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Moreover, IGF-1 was secreted by AP + GSCs as well as testicular stromal Leydig cells to form an autocrine and paracrine signaling loop

Furthermore, it is a primary component in over a hundred herbal medicines derived from medicinal plants, such as winterflower, mulberry parasol, prickly ginseng, astragalus, and ginkgo biloba

For example, similar to tumor cells, CAFs have a glycolytic phenotype and secrete lactic acid, which not only serves as an energy source for tumor cells and contributes to the formation of an acidic environment that suppresses immune cell function[24]

But the studies measured the levels of a single chemical at one point in time, says McAlonan