FM 1-43 (N-(3-Triethylammoniumpropyl)-4-(4-(dibutylamino)styryl pyridinium dibromide)

神經末梢熒光探針

產品簡介：

FM 1-43，英文全名：N-(3-Triethylammoniumpropyl)-4-(4-(Dibutylamino) Styryl) Pyridinium Dibromide，是一種親脂的苯乙烯染料，是一種優秀的膜探針用來鑒定活躍的放電神經元和用于調研活動依賴性的囊泡循環。這一水溶性的染料對細胞無毒，且在水溶液中基本無熒光，一旦插入細胞膜外層后發射強熒光。在活躍釋放神經遞質的神經元中，FM 1-43內在化進入循環的突出囊泡，神經末梢被明亮染色。成像檢測前只需簡單清洗去除非特異性得細胞表面膜染色。

產品特性：

1） CAS NO.：149838-22-2

2） 同義名：Pyridinium, 4-[2-[4-(dibutylamino)phenyl]ethenyl]-1-[3-(triethylammonio)propyl]-, dibromide

3） 分子式：C30H49Br2N3

4） 分子量：611.54

5） 純度：≥95%（HPLC）

6） 溶解性：溶于水

7） Ex/Em：510/626nm (MeOH); 480/598 (membrane-bound);

8）化學結構圖：

保存條件: 

-20°C避光干燥保存，至少1年有效。

產品使用：

1. 儲存液配制

于實驗前，將凍干粉置于室溫回溫至少20min，加入無菌水配制成10mM或其他濃度儲存液，比如，對于1mgFM 1-43（MW: 611.54）加入163μl DMSO,充分溶解后即得到10mM儲存液，根據單次用量分裝，≤-20℃凍存，避免反復凍融。

2. 染色方法（僅作參考）

應用示例（來自文獻，僅作參考）

FM 1–43 Labeling and Unloading：

① FM 1–43儲存液(1000X):用水溶解FM1-43配制4mM儲存液。按20μL每管分裝保存在-20℃避光。如果希望標記后固定樣本，選擇FM 1–43FX。

② HL-3 + 90 mM KCl溶液: 25 mM NaCl, 90 mM KCl, 10 mM NaHCO3, 5 mM HEPES, 30 mM sucrose, 5 mM threalose, 10 mM MgCl2, pH to 7.2.新鮮制備，超過2d后不可使用，4℃保存。加入CaCl2（1M標準液）以得到終濃度為1.5mM的CaCl2（或希望使用的其他濃度）。

③ 使用KCl刺激法用FM1-43標記突觸小泡（Labeling of Synaptic Vesicles with FM 1–43 Using KCl Stimulation）：

◇FM 1–43標記液: Add 1 μL FM 1–43 stock solution to 1 mL HL-3 plus 90 mM KCl solution with calcium (final concentration of FM 1–43 is 4 μM).

◇Incubate the dissected larva in FM 1–43 labeling solution by replacing the HL-3 solution without calcium. Do not add the solution on top of the larva but gently pipet the solution on the side of the larva. Start a timer; once you add the labeling solution, exocytosis and endocytosis are induced, and FM 1–43 labeling ensues. The incubation time will depend on your experiment, but a 1-min incubation leads to robust labeling in wild-type animals). Since some mutants are temperature sensitive, it may be necessary to perform experiments at high temperature (see Note 2 if this is the case).

◇Following stimulation, remove FM 1–43 labeling solution and wash five times over a total of 5–10 min with a generous amount of HL-3 solution without calcium to stop stimulating and to remove dye not internalized. Do not add the solution on top of the larva but gently pipet the solution on the side of the larva to avoid muscle damage. Gently perfuse the wash solution by pipeting up and down.

◇Image labeled vesicles on a confocal microscope with an ×40 water immersion lens and quantify intensity of labeling as described in Subheading 3.5.

Fig. FM 1–43 labeling of a third-instar larval fillet. (A)–(E) Third instar larval fillet incubated for 1 min in HL-3 with 4 μM FM 1–43, 90 mM KCl, and 1.5 mM calcium, washed, and the FM 1–43 imaged (D). The same preparation was then briefly fixed with 3.7% formaldehyde and labeled with mouse anti-DLG antibodies (28; 4F3 monoclonal antibody; Developmental Studies Hybridoma bank) used at 1:50 (B), (C), and (E) to reveal synaptic boutons at the NMJs and Alexa 635-conjugated phalloidin (Invitrogen cat. no. A34054) used at 0.001 unit/μL (A) and (C) to reveal muscles. (A)–(C) two hemisegments labeled with phalloidin (A) and DLG (B), merged in (C). The dashed line in (A) shows the ventral midline, and muscles commonly used in the genetic analysis of synaptic function are marked. (D) FM 1–43 labeling (before fixation of the preparation) of the NMJ in the boxed area on muscle 4 shown in (C). (E) The same synapse as shown in (D), labeled with DLG (see B) following fixation of the preparation.

注意事項：

1.      熒光染料都存在淬滅的問題，保存和操作過程中注意避光。

2.      苯乙烯染料在水溶液中基本無熒光，最大發射波長具pH依賴性。苯乙烯染料的光譜特征在甲醇或氯仿中測定。其在膜環境中的最大激發和最大發射波長都會變短。最大激發波長的差異通常在20nm，發射波長的差異通常是80nm，但依具體的探針有所差異。

3.      FM^?是Molecular Probe公司的注冊商標。

4.      為了您的安全和健康，請穿實驗服并戴一次性手套操作。

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