Mechanism of Action Tamoxifen (SERM): Binds directly to estrogen receptors (ERs) , preventing estrogen from activating the receptor Acts as an estrogen antagonist in tissues like the breast and hypothalamus Acts as a partial agonist in tissues like bone and liver Does not lower estrogen production , but rather blocks its activity Aromatase Inhibitors (AIs): Inhibit the aromatase enzyme , which is responsible for converting androgens (testosterone, androstenedione) into estradiol (E2) Result in a systemic reduction of circulating estrogen levels No receptor bindingjust synthesis suppression Tamoxifen modulates the estrogen receptor, while aromatase inhibitors reduce estrogen synthesis at the enzymatic level. Smith & Dowsett, Endocrine-Related Cancer Clinical Use in Women Tamoxifen is preferred for premenopausal women with ER+ breast cancer , where the ovaries still produce significant estrogen
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Transgenerational epigenetic effects have also been induced in germ cells, mostly through DNA methylation and epimutations
These findings were consistent with those of phylogenetic analyses conducted on rice, wheat, and maize, which revealed that HPPD , VTE1 , and VTE5 belonged to the same ancestral lineage and shared conserved motifs, functional domains, and structural characteristics associated with - TOC biosynthesis genes