{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n Beta‐defensin 121 (DEFB121) belongs to a family of small, cationic peptides that exhibit broad‐spectrum antimicrobial activities and play dual roles in innate immunity and reproductive physiology. Studies in the male reproductive tract have demonstrated that defensins related to human DEFB121 are highly expressed in the epididymis, where their expression is both developmentally regulated and androgen dependent. In these tissues, defensins not only provide protection against microbial invasion by exhibiting potent antibacterial activity but also are implicated in non‐immunological processes such as sperm maturation and capacitation, thereby contributing to fertility."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Transcriptomic analyses of the epididymis and associated reproductive tissues have further highlighted the importance of region-specific gene expression patterns in the functional differentiation of these organs. Although not exclusively focused on DEFB121, these studies reinforce the concept that defensins are amongst the locally expressed genes that help maintain the unique microenvironments necessary for sperm maturation and overall reproductive success."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Additionally, similar antimicrobial peptides have been identified in other tissues, such as the eccrine glands of porcine snout skin, where the co-expression of defensins with other antimicrobial products suggests a generalized mechanism in which these peptides contribute to local host defense by protecting epithelial integrity."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Finally, differential expression of host defense genes, including those encoding defensins, has been associated with variations in the immune response and pathogenesis during severe infections by agents such as Francisella tularensis. These findings underpin the broader importance of defensins, like DEFB121, in modulating both antimicrobial responses and inflammatory processes during infection."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In summary, DEFB121 exemplifies a multifunctional peptide that not only provides localized antimicrobial defense in the male reproductive tract to protect against microbial invasion but also plays a critical role in sperm maturation processes. This dual functionality underscores the broader relevance of defensins in both reproductive biology and innate immunity.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Suresh Yenugu, Vishnu Chintalgattu, Christopher J Wingard, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Identification, cloning and functional characterization of novel beta-defensins in the rat (Rattus norvegicus)."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Reprod Biol Endocrinol (2006)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1186/1477-7827-4-7"}], "href": "https://doi.org/10.1186/1477-7827-4-7"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "16457734"}], "href": "https://pubmed.ncbi.nlm.nih.gov/16457734"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Benoît Guyonnet, Guillemette Marot, Jean-Louis Dacheux, et al. "}, {"type": "b", "children": [{"type": "t", "text": "The adult boar testicular and epididymal transcriptomes."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "BMC Genomics (2009)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1186/1471-2164-10-369"}], "href": "https://doi.org/10.1186/1471-2164-10-369"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "19664223"}], "href": "https://pubmed.ncbi.nlm.nih.gov/19664223"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "K Fukui, T Yasui, H Gomi, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Histochemical localization of sialic acids and antimicrobial substances in eccrine glands of porcine snout skin."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Eur J Histochem (2012)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.4081/ejh.2012.e6"}], "href": "https://doi.org/10.4081/ejh.2012.e6"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "22472894"}], "href": "https://pubmed.ncbi.nlm.nih.gov/22472894"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Luke C Kingry, Ryan M Troyer, Nicole L Marlenee, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Genetic identification of unique immunological responses in mice infected with virulent and attenuated Francisella tularensis."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Microbes Infect (2011)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.micinf.2010.10.022"}], "href": "https://doi.org/10.1016/j.micinf.2010.10.022"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "21070859"}], "href": "https://pubmed.ncbi.nlm.nih.gov/21070859"}]}]}]}