Fiche d'information compilée à partir de PubMed
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Compilé à partir de 30 articles PubMed · modèle : gemma4:31b
Résumé
Betula pubescens, known as downy birch, is a tree species whose buds and heartwood contain bioactive compounds with potential antimicrobial and cytotoxic properties [PMID:34668363, PMID:34935543].
Contexte
Betula pubescens (downy birch) is a tetraploid tree species found in various regions including Europe, Asia, and Iceland [PMID:38613229, PMID:36331896]. It is known to hybridize with other birch species, such as Betula nana [PMID:36779661, PMID:36331896].
Usages traditionnels
Birch buds (Gemmae Betulae) are used in Russian and Chinese traditional medicine primarily as diuretic and diaphoretic agents, as well as antiseptics, anti-inflammatories, and analgesics [PMID:30106978].
Composés actifs
Downy birch buds contain sesquiterpenoids, triterpenoids, and flavonoids [PMID:34668363]. Specific identified compounds include santin, cirsimaritin [PMID:34755444], and triterpene seco-acids such as 3,4-seco-olean-4(24)-en-19-oxo-3-oic acid and 3,4-seco-urs-4(23),20(30)-dien-19-ol-3-oic acid [PMID:31717557]. The false heartwood contains cyclic diarylheptanoids, including betuladiol and betulondiol [PMID:34935543]. Foliar concentrations of quercetin derivatives vary by latitude [PMID:18946705].
Mécanisme d'action
Certain flavonoids (santin and cirsimaritin) induce apoptosis in digestive system cancer cells via the activation of caspase-3, -7, -8, and -9, and the upregulation of p53 in wild-type cells [PMID:34755444]. Triterpene seco-acids from buds also exhibit cytotoxic effects on specific cancer cell lines [PMID:31717557].
Preuves cliniques
Preuve CBurn wounds and sunburn
Herbal preparations containing extracts from Betula pubescens (and B. pendula) have shown better effectiveness in treating burn wounds, including reducing inflammation and shortening healing time compared to conventional treatments [PMID:36839954].
Sécurité et effets indésirables
White birch pollen contains proteolytic enzymes that can degrade tight junction proteins (occludin and claudin), potentially facilitating allergen delivery across epithelial layers [PMID:17986111].
Synthèse des preuves
The available evidence consists primarily of in vitro cytotoxic studies, phytochemical analyses, and a review of botanical preparations for burns. There are no high-level clinical trial data (Level A or B) provided in the abstracts.
Sources PubMed
- 1.PMID: 34668363 (2022) — Secondary metabolites of downy birch buds (Betula pubescens Erch.). · Zeitschrift fur Naturforschung. C, Journal of biosciences
- 2.PMID: 38613229 (2024) — Complex Polyploids: Origins, Genomic Composition, and Role of Introgressed Alleles. · Systematic biology
- 3.PMID: 34935543 (2022) — New cyclic diarylheptanoids from the false heartwood of Betula pubescens Ehrh. · Natural product research
- 4.PMID: 36779661 (2023) — Microscopical palynology: Birch woodland expansion and species hybridisation coincide with periods of climate warming during the Holocene epoch in Iceland. · Journal of microscopy
- 5.PMID: 30106978 (2018) — Cytotoxicity of white birch bud extracts: Perspectives for therapy of tumours.