磷黴素
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臨床資料 | |
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商品名 | Monuril、Monurol、Ivozfo及其他 |
其他名稱 | Phosphomycin, phosphonomycin, fosfomycin tromethamine |
AHFS/Drugs.com | Monograph |
MedlinePlus | a697008 |
核准狀況 | |
給藥途徑 | 靜脈注射, 口服給藥 |
ATC碼 | |
法律規範狀態 | |
法律規範 |
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藥物動力學數據 | |
生物利用度 | 30–37% (口服磷黴素的氨丁三醇鹽),會受食物攝取影響 |
血漿蛋白結合率 | Nil |
藥物代謝 | Nil |
生物半衰期 | 5.7小時(平均) |
排泄途徑 | 腎臟, 以藥物原形排除 |
識別資訊 | |
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CAS號 | 23155-02-4( 78964-85-9 (tromethamine salt)) ![]() |
PubChem CID | |
DrugBank | |
ChemSpider | |
UNII | |
KEGG | |
ChEBI | |
ChEMBL | |
CompTox Dashboard (EPA) | |
ECHA InfoCard | 100.041.315 |
化學資訊 | |
化學式 | C3H7O4P |
摩爾質量 | 138.06 g·mol−1 |
3D模型(JSmol) | |
熔點 | 94 °C(201 °F) |
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磷黴素(INN:fosfomycin)常見商品名 Monurol,由弗氏鏈黴菌(Streptomyces fradiae)產生而發現,為含磷抗生素,有抑制或殺滅革蘭氏陽性和陰性菌的作用,主要用於治療下尿路感染(下尿路通常指膀胱和尿道)的抗生素[8]。不適用於治療腎臟感染,偶爾用於治療前列腺感染[8]。一般的給藥路徑為口服[8]。也有靜脈注射製劑可供使用[9]。
使用後常見的副作用有腹瀉、噁心、頭痛和念珠菌性外陰陰道炎。[8]嚴重的副作用有過敏反應和偽膜性結腸炎。[8]雖然沒發現個體於懷孕期間使用會對胎兒有害,但並不推薦使用。[10]進行母乳哺育的個體單次服用,對於嬰兒似乎安全。[10]它通過干擾細菌細胞壁的生成而發揮作用。[8]
磷黴素於1969年被發現。並在1996年在美國取得批准用於醫療用途[8][11]並已列入世界衛生組織基本藥物標準清單之中。[12]。世界衛生組織(WHO)認為它是人類不可或缺的藥物[13]。此藥物有其非專利藥物在市場中銷售[14]。
此藥物最初是利用某些類型的鏈球菌來生產,現在則改用化學合成法生產[11]。
醫療用途
[編輯]磷黴素用於治療膀胱感染及尿路感染(urinary tract infection簡稱UTI),通常口服單劑量即可。[15]
不建議12歲以下兒童使用磷黴素口服製劑。[16]
此外,醫界也在研究磷黴素在治療其他疾病方面的潛力。[17]近來由於全球抗生素抗藥性案例數目升高的問題導致人們又開始重視磷黴素這種藥物。[18]
磷黴素可有效治療尿路感染和複雜性尿路感染(包括急性腎盂腎炎)。複雜尿路感染的標準用藥方案是每48或72小時口服一次,每次劑量3克,共3次給藥。或者當以靜脈注射形式給藥時,每8小時一次,每次6克,持續7至14天。[9]
有越來越多使用靜脈注射磷黴素製劑於治療由多重抗藥細菌引起的感染,通常是以聯合用藥的方式以避免產生抗藥性,及利用其與多種其他抗菌藥物的協同作用。在實際應用中,靜脈注射磷黴素最常用於治療肺炎(34%)、血流感染(22%)和尿路感染(21%)。在大多數情況下,它與β-內醯胺抗生素聯合使用,且在大約一半的病例中,它被用作經驗性治療。[19][20]成人每日劑量通常為12至24克。[21]當以持續輸注方式給藥時,磷黴素的起始劑量為8克,隨後每日劑量為16克或24克。建議腎功能正常的患者採用持續輸注。[21][22]
磷黴素在體外和體內研究中均顯示出強效的抗生物膜活性,包括針對醫用植入物感染。它對革蘭氏陽性菌(包括耐甲氧西林金黃色葡萄球菌(MRSA))和革蘭氏陰性菌均保持抗生物膜活性。[23]
細菌敏感性
[編輯]磷黴素抗菌活性廣泛,對革蘭氏陽性和革蘭氏陰性病原菌均有效。[25]對腸球菌(E. faecalis)、大腸桿菌(E. coli)以及各種革蘭氏陰性菌如檸檬酸桿菌屬(Citrobacter)和變形桿菌屬(Proteus)均有較強的抗菌活性。由於磷黴素在低pH值環境中具有較強的活性,且主要以活性形式排出到尿液中,已被用於預防和治療這些泌尿系統病原體引起的尿路感染。它對腐生葡萄球菌(S. saprophyticus),克雷伯氏菌屬(Klebsiella)和腸桿菌屬(Enterobacter)的活性是可變的,應通過最小抑菌濃度檢測確認。由於該藥物不受交叉抗藥問題的影響,所以對產超廣譜β-內醯胺酶(ESBL)病原體,特別是生產ESBL的大腸桿菌活性有良至優的程度。現有的臨床數據支持其用於易感生物引起的簡單型尿路感染。然而,當細菌感染擴散到全身時,我們不能再用"每公升藥物濃度64毫克"這個標準來判斷藥物是否有效。這個標準可能只適用於像尿道感染這種局部感染。[26]
抗藥性
[編輯]使用磷黴素治療中經常會產生抗藥性,導致其不適用於嚴重感染的持續性治療。細菌發生突變,導致非必需甘油磷酸轉運蛋白失活,使其對磷黴素產生抗藥性。[27][28][29]但仍能使用磷黴素來治療抗甲氧西林金黃色葡萄球菌感染。[30]
將磷黴素與至少另一種活性藥物一起使用可降低產生抗藥性的風險。磷黴素與許多其他抗生素協同作用,包括胺基糖苷類抗生素、碳青黴烯、頭孢菌素、達托黴素和奧利萬星。[31]
三種相關的磷黴素抗性酶(命名為 FosA、FosB 和 FosX)是乳醯穀胱甘肽裂解酶超家族的成員。這些酶通過親核攻擊磷黴素的碳1,打開環氧化物環,使藥物無效。[33]
這些酶因反應中使用的親核試劑的種類而異: FosA為穀胱甘肽,FosB為芽孢桿菌硫醇,[34][35]FosX為水。[32]
一般來說,FosA和FosX酶由革蘭氏陰性菌產生,而FosB由革蘭氏陽性菌產生。[32]
FosC用ATP,向磷黴素添加一個磷酸基團,從而改變其特性並使藥物無效。[36]
副作用
[編輯]人體對該藥物耐受性良好,且有害副作用發生率低。[15]
作用機制
[編輯]雖然磷黴素名稱以-黴素(-omycin)結尾,它不是一種大環內酯。磷黴素通過滅活UDP-N-乙醯氨基葡萄糖-3- 烯醇丙酮基轉移酶抑制細菌細胞壁生物合成。[37]這種酶催化肽聚糖生物合成的必要步驟:連接磷酸烯醇式丙酮酸(PEP)到UDP-N-乙醯葡萄糖胺的3'-羥基,PEP提供肽聚糖相互連接的橋接劑。磷黴素是一種PEP類似物,可以通過烷基化活性部位半胱氨酸殘基(大腸桿菌中的Cys115)來抑制MurA。[38][39]
磷黴素通過甘油磷酸轉運蛋白進入細菌細胞。[40]
歷史
[編輯]磷黴素(Fosfomycin,原名phosphonomycin)是由默克公司和西班牙的西班牙青黴菌和抗生素公司(CEPA)共同發現。它首先是通過篩選從土壤樣本中分離出來的弗雷迪鏈黴菌肉湯培養物進行分離,確定其能夠使生長中的細菌形成原生質球。1969年有一系列論文來描述這一發現。[41]CEPA於1971年在其阿蘭胡埃斯工廠開始大規模生產磷黴素。[42]
生物合成
[編輯]科學家已成功複製並分析弗雷迪鏈黴菌中製造磷黴素的整套基因(基因簇)。藉由趙惠民和威爾弗雷德·范德東克研究團隊中的的賴安·伍德爾(Ryan Woodyer)的工作,他們也在淡紫鏈黴菌(Streptomyces lividans)中成功生產磷黴素。[43]
合成生產
[編輯]磷黴素的商業化生產主要依賴於一個化學轉化過程:通過製備順式丙烯基膦酸的環氧化物以產生磷黴素外消旋混合物而達成。[44]
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