TWI832128B - 使用作為黑皮質素-4受體選擇性促效劑 - Google Patents
使用作為黑皮質素-4受體選擇性促效劑 Download PDFInfo
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- TWI832128B TWI832128B TW110147939A TW110147939A TWI832128B TW I832128 B TWI832128 B TW I832128B TW 110147939 A TW110147939 A TW 110147939A TW 110147939 A TW110147939 A TW 110147939A TW I832128 B TWI832128 B TW I832128B
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- Prior art keywords
- melanocortin
- receptors
- compound
- acid
- pharmaceutically acceptable
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Abstract
Description
本發明係關於下式1之化合物或其藥學上可接受的鹽作為黑素皮質素-4受體(MC4R)之選擇性促效劑的用途:
其中,R1係C2-C5烷基。
黑皮質素受體(MCR)是一類G蛋白偶聯受體(GPCR),並且G蛋白的主要作用是活化第二信使且通過訊息傳遞調節細胞對多種生理刺激的反應。到目前為止,已識別了黑皮質素受體之五種亞型。MC1R主要在黑素細胞和巨噬細胞中表達,並且藉由調節黑素細胞中的黑色素決定皮膚和頭髮的顏色。MC2R在腎上腺和脂肪組織中表達,並且促腎上腺皮質
素對腎上腺激素分泌的調節作用是眾所周知的。MC3R、MC4R和MC5R不僅在神經末梢中表達,而且在大腦中表達,因此可以理解它們藉由黑皮質素肽調節中樞神經作用,其表現為對行為、學習、記憶、食慾以及神經的生成和再生的影響。到目前為止,已知MC3R與勃起功能障礙和發炎反應有關,而MC4R與肥胖和糖尿病有關,並且正在積極開展對每種受體的作用的特異性研究(MacNeil DJ et al.,Eur J Pharmacol 2002,450,93)。結果發現MC4R與肥胖人群的基因研究密切相關,並且藉由顯示去除了MC4R的基因剔除小鼠會因飲食過量而導致肥胖,證明了此受體在食慾調節中起重要作用(Lu D,Willard D et al.,Nature 1994,371(6500),799;Huszar D et al.,Cell 1997,88(1),131;Hinney A et al.,J Clin Endocrinol Metab 1990,84(4),1483)。
在黑皮質素受體中,已知MC4R參與能量代謝和體重控制。至於其他MCR亞型,因為它們參與各種體內功能的調節作用,例如皮膚色素沉著、能量穩態和外分泌功能,故確保MC4R促效劑化合物對MC4R的選擇性對於預防將來可能發生的副作用非常重要。具體而言,MC1R主要在皮膚細胞中表達且已知通過黑色素活性參與皮膚色素沉著。現有的黑皮質素受體非選擇性促效劑中出現的皮膚色素沉著的副作用可能主要是由MC1R刺激能力和皮內藥物蓄積引起的。因此,在現有的化合物中,本發明人等藉由了解結構與能夠選擇性地活化MC4R的活性之間的關係,嘗試發現能夠對MC4R表現出選擇性的化合物。(Wikberg et al,Eur.J.Pharmacol 1999,375,295-310;Wikberg,et al.,Pharm Res 2000,42(5)
393-420;Douglas et al.,Eur J Pharm 2002,450,93-109;O’Rahilly et al.,Nature Med 2004,10,351-352.)
本發明旨在提供下式1之化合物或其藥學上可接受的鹽作為黑皮質素-4受體(MC4R)的選擇性促效劑的用途:
其中,R1係C2-C5烷基。
本發明提供了一種用於預防或治療與黑皮質素受體相關的疾病之藥物,對黑皮質素-4受體具有選擇性促效作用,其包含治療有效量的下式1之化合物或其藥學上可接受的鹽:
其中,R1係C2-C5烷基。
此外,本發明提供了一種用於預防或治療與黑皮質素受體相關的疾病之醫藥組成物,對黑皮質素-4受體具有選擇性促效作用,其包含治療有效量之式1之化合物或其藥學上可接受的鹽,以及藥學上可接受之載體。
此外,本發明提供了一種藉由對黑皮質素-4受體的選擇性促效作用來預防或治療與黑皮質素受體相關的疾病之方法,其包括給予需要的受試者施用治療有效量的式1之化合物或其藥學上可接受的鹽。
此外,本發明提供了式1之化合物或其藥學上可接受的鹽作為黑皮質素-4受體的選擇性促效劑之用途。
本發明詳細描述如下。
根據本發明的一個方面,提供了一種用於預防或治療與黑皮質素受體相關的疾病之藥物,該藥物對黑皮質素-4受體具有選擇性促效劑作用,其包含治療有效量的式1之化合物或其藥學上可接受的鹽。
根據本發明的另一個方面,提供了一種用於預防或治療與黑皮質素受體相關的疾病之醫藥組成物,該醫藥組成物對黑皮質素-4受體具
有選擇性促效劑作用,其包含治療有效量的式1之化合物或其藥學上可接受的鹽以及藥學上可接受的載體。
在根據本發明之一實施態樣中,式1之該化合物係下式2之N-((3S,5S)-1-((3S,4R)-1-(三級-丁基)-4-(4-氯苯基)吡咯啶-3-羰基)-5-(嗎福林-4-羰基)吡咯啶-3-基)-N-((1s,4R)-4-甲基環己基)異丁醯胺:
在根據本發明之另一實施態樣中,該藥學上可接受的鹽的實例包括酸加成鹽,由諸如鹽酸、硫酸、硝酸、磷酸、氫溴酸和氫碘酸等無機酸形成;由諸如酒石酸、甲酸、檸檬酸、乙酸、三氯乙酸、三氟乙酸、葡萄糖酸、苯甲酸、乳酸、富馬酸、馬來酸等有機羧酸形成;由諸如甲磺酸、苯磺酸、對甲苯磺酸和萘磺酸等磺酸形成,但不限於此。在根據本發明之另一實施態樣中,該藥學上可接受的鹽可選自由鹽酸、硫酸、硝酸、磷酸、氫溴酸及氫碘酸所構成之群組。在根據本發明之另一實施態樣中,該藥學上可接受的鹽係鹽酸鹽。
在根據本發明之另一實施態樣中,式1之化合物的鹽酸鹽可以根據以下反應流程1製備。然而,所屬領域中具有通常知識者可以基於式1的結構藉由各種方法製備式1之化合物。
在反應流程1中,
R2係C1至C5烷基;
R3係未取代或被1或2個C1至C5烷基取代的C3至C8環烷基;以及
R4及R5各自獨立地為氫或鹵素。
在根據本發明之另一實施態樣中,式1之化合物或其藥學上可接受的鹽對黑皮質素-4受體的選擇性相對於對黑皮質素-1受體的比例可以為2或更多。在根據本發明之另一實施態樣中,式1之化合物或其藥學上可接受的鹽對黑皮質素-4受體的選擇性相對於對黑皮質素-1受體的比例可以為3或更多。在根據本發明之另一實施態樣中,式1之化合物或其藥學上可接受的鹽對黑皮質素-4受體的選擇性相對於對黑皮質素-1受體的比例可以為4或更多。在根據本發明之另一實施態樣中,式1之化合物或其藥學上可
接受的鹽對黑皮質素-4受體的選擇性相對於對黑皮質素-1受體的比例可以為5或更多。
在本發明之另一實施態樣中,式1之化合物或其藥學上可接受的鹽對黑皮質素-4受體的選擇性可以通過測量和比較受體的促效活性來確認。例如,黑皮質素-4受體(MC4R)和黑皮質素-1受體(MC1R)的促效活性被測量為EC50(半最大有效濃度,誘導50%最大促效活性的濃度),然後因為在這種情況下EC50的值越低,促效能力越好,故藉由計算MC1R中的EC50與MC4R中的EC50的比值(MC1R/MC4R),可以確認該比值越大,對MC4R的選擇性越好。
在根據本發明之另一實施態樣中,與黑皮質素受體相關的疾病可以選自肥胖、糖尿病、發炎和勃起功能障礙所構成之群組。在根據本發明之另一實施態樣中,與黑皮質素受體相關的疾病可以係肥胖。
在根據本發明之另一實施態樣中,藥物或醫藥組成物可以減少色素沉著。與黑皮質素受體的其他亞型相比,根據本發明的式1之化合物或其藥學上可接受的鹽對黑皮質素-4受體具有優異的選擇性,例如,根據本發明的式1之化合物或其藥學上可接受的鹽與黑皮質素-1受體相比對黑皮質素-4受體具有優異的選擇性,從而減少皮膚色素沉著且有效預防或治療與黑皮質素受體相關的疾病。
在根據本發明之另一實施態樣中,個體受試者的「治療有效劑量」是指足以實現上述藥理作用,例如,如上所述的治療作用的量。化合物的量可以根據受試者的狀況和嚴重程度、給藥模式和待治療受試者的
年齡而變化,但是可以由所屬技術領域中具有通常知識者基於他們的知識來確定。
在根據本發明之另一實施態樣中,式1之化合物的治療有效劑量,例如,根據給藥的頻率和強度,通常在每天約0.1至500mg的範圍內。成人肌內內或靜脈內給藥的典型日劑量為在每日約0.1至300毫克的範圍內,其可以分單位劑量給藥。一些患者可能需要更高的每日劑量。
在本發明中,「醫藥組成物」除了本發明的有效成分外,還可以包含其他成分,例如,載體、稀釋劑、賦形劑等。因此,視需要,醫藥組成物可以包括藥學上可接受的載體、稀釋劑、賦形劑或其組合。醫藥組成物有助於將化合物給藥到體內。施用化合物的各種方法包括但不限於口服、注射、氣霧劑、腸胃外和局部施用。
在本文中,「載體」係指有助於將化合物添加到細胞或組織中的化合物。例如,二甲亞碸(DMSO)是一種有助於將許多有機化合物給藥到活細胞或組織中之常規載體。
在本文中,「稀釋劑」是指不僅穩定生物活性形式而且在溶解化合物的溶劑中稀釋之化合物。在緩衝液中溶解的鹽被用作本領域之稀釋劑。常規使用的緩衝液是模擬體液中鹽形式的磷酸鹽緩衝生理鹽水。由於緩衝溶液可以在低濃度下控制溶液的pH,因此緩衝稀釋劑幾乎不會改變化合物之生物活性。
在本文中,「藥學上可接受的」是指不損害生物活性和物理性質的性質。
本發明的化合物可以配製成各種藥物給藥劑型。在本發明的醫藥組成物的製備中,將活性成分(具體地為式1之化合物或其藥學上可接受的鹽)與考慮到要製備的劑型而選定的藥學上可接受的載體混合。例如,本發明的醫藥組成物可以根據需要配製成注射劑、口服製劑及其類似物。
本發明的化合物可以藉由使用已知的醫藥載體和賦形劑的常規方法進行配製,並插入一個單元或多個單元的容器中。製劑可以是油或水溶劑中的溶液、懸浮液或乳液,並且包括常規分散劑、懸浮劑或穩定劑。此外,化合物可以是,例如,乾粉形式,其在使用前溶解於無菌無熱原水中。本發明的化合物可藉由使用常規的栓劑基質,例如,可可脂或其他甘油酯配製成栓劑。用於口服給藥的固體形式包括膠囊、錠劑、丸劑、散劑和顆粒劑。膠囊和錠劑為佳。錠劑和丸劑較佳為腸溶衣的。藉由將本發明的化合物與至少一種選自惰性稀釋劑如蔗糖、乳糖或澱粉、潤滑劑如硬脂酸鎂、崩解劑、黏合劑及其類似物的載體混合來製備固體形式。此外,可以配製成穿皮劑型,例如,乳液、軟膏、凝膠、乳膏、貼片劑或噴霧劑。
在本文中,術語「預防」係指減少或消除感染疾病的可能性。
在本文中,術語「治療」係用於表示阻止、延遲或改善表現出疾病症狀的受試者的疾病進展。
根據本發明的藥物或醫藥組成物可有效預防或治療與黑皮質素受體相關的疾病,例如,肥胖、糖尿病、發炎或勃起功能障礙,同時藉由對黑皮質素-4受體的優異選擇性來確保安全性,而不會因對其他黑皮質素受體的作用而產生副作用之風險。
圖1係顯示在小鼠模型中根據重複給藥測量皮膚和血漿中之藥物濃度的結果。
圖2係顯示在猴子的重複毒性試驗中確認皮膚和皮膚毛髮上的色素沉著模型的結果。
以下係藉由實施例用於更詳細說明本發明之實施方式。然而,須理解的是本發明的保護範圍並不限於此等實施例。
製備實施例:N-((3S,5S)-1-((3S,4R)-1-(三級-丁基)-4-(4-氯苯基)吡咯啶-3-羰基)-5-(嗎福林-4-羰基)吡咯啶-3-基)-N-((1s,4R)-4-甲基環己基)異丁醯胺鹽酸鹽之合成
通過以下步驟A、B、C和D而獲得目標化合物。
步驟A:甲基(2S,4S)-1-((3S,4R)-1-(三級-丁基)-4-(4-氯苯基)吡咯啶-3-羰基)-4-(N-((1s,4R)-4-甲基環己基)異丁醯胺)吡咯啶-2-羧酸酯之製備
將甲基(2S,4S)-4-(N-((1s,4R)-4-甲基環己基)異丁醯胺基)吡咯啶-2-羧酸酯鹽酸鹽(28.7g,82.73mmol)、(3S,4R)-1(三級-丁基)-4-(4-氯苯基)吡咯啶-3-羧酸(24.5g,86.67mmol)、1-(3-二甲基胺基丙基)-3-乙基碳二亞胺鹽酸鹽(22.2g,115.83mmol)及1-羥基苯并三唑水合物(15.7g,115.83mmol)溶解於N,N’-二甲基甲醯胺(400ml),並緩慢地加入N,N'-二異丙基乙胺(72.0ml,413.66mmol)。在室溫攪拌16小時後,減壓濃縮反應溶劑,然後加入0.5N氫氧化鈉水溶液,並用乙酸乙酯萃取兩次。使用氯化鈉水溶液和水洗滌有機層兩次,用無水硫酸鎂乾燥並過濾。將濾液減壓濃縮並藉由管柱層析法純化以獲得目標化合物(41.19g,87%)。
MS[M+H]=575(M+1)
步驟B:(2S,4S)-1-((3S,4R)-1-(三級-丁基)-4-(4-氯苯基)吡咯啶-3-羰基)-4-(N-((1s,4R)-4-甲基環己基)異丁醯胺基)吡咯啶-2-羧酸之製備
將步驟A所獲得的甲基(2S,4S)-1-((3S,4R)-1-(三級-丁基)-4-(4-氯苯基)吡咯啶-3-羰基)-4-(N-((1s,4R)-4-甲基環己基)異丁醯胺基)吡咯啶-2-羧酸酯(39.4g,68.62mmol)溶解於甲醇(450ml)並加入6N氫氧化鈉水溶液(57.2ml,343.09mmol)。在室溫攪拌16小時且使用6N鹽酸水溶液將pH調整至約5後,減壓濃縮反應溶液。將濃縮物溶解在二氯甲烷中,然後用紙濾器過濾不溶性固體。減壓濃縮濾液以得到粗產物(38.4g,99%),其無需純化即可用於下一步驟。
MS[M+H]=561(M+1)
步驟C:N-((3S,5S)-1-((3S,4R)-1-(三級-丁基)-4-(4-氯苯基)吡咯啶-3-羰基)-5-(嗎福林-4-羰基)吡咯啶-3-基)-N-((1s,4R)-4-甲基環己基)異丁醯胺之製備
將步驟B獲得的(2S,4S)-1-((3S,4R)-1-(三級-丁基)-4-(4-氯苯基)吡咯啶-3-羰基)-4-(N-((1s,4R)-4-甲基環己基)異丁醯胺基)吡咯啶-2-羧酸(38.4g,68.60mmol)、1-(3-二甲基胺基丙基)-3-乙基碳二亞胺鹽酸鹽(18.4g,96.04mmol)及1-羥基苯并三唑水合物(13.0g,96.04mmol)溶解於N,N'-二甲基甲醯胺(200ml),然後緩慢地加入嗎福林(5.9ml,68.80mmol)及N,N'-二異丙基乙胺(59.7ml,343.02mmol)。在室溫攪拌16小時後,減壓濃縮反應溶液,加入0.5N氫氧化鈉水溶液,並用乙酸乙酯萃取兩次。使用氯化鈉水溶液和水洗滌有機層兩次,用無水硫酸鎂乾燥並過濾。將濾液減壓濃縮並藉由管柱層析法純化以獲得目標化合物(37.05g,86%)。
MS[M+H]=630(M+1)
步驟D:N-((3S,5S)-1-((3S,4R)-1-(三級-丁基)-4-(4-氯苯基)吡咯啶-3-羰基)-5-(嗎福林-4-羰基)吡咯啶-3-基)-N-((1s,4R)-4-甲基環己基)異丁醯胺鹽酸鹽之製備
將步驟C獲得的N-((3S,5S)-1-((3S,4R)-1-(三級-丁基)-4-(4-氯苯基)吡咯啶-3-羰基)-5-(嗎福林-4-羰基)吡咯啶-3-基)-N-((1s,4R)-4-甲基環己基)異丁醯胺(5.0g,7.95mmol)溶解於乙酸乙酯(50ml),並緩慢地加入2N鹽酸乙酸乙酯溶液(3.97ml,15.89mmol)。在室溫攪拌30分鐘後,減壓濃縮反應溶劑。將獲得的粗固體使用乙烷及二乙酯研製純化以獲得目標化合物(5.23g,99%)。
MS[M+H]=630(M+1)
1H NMR(500MHz,CD3OD)δ 7.49-7.44(m,4H)、4.83(m,1H)、4.23-4.20(m,1H)、3.95-3.91(m,2H)、3.79-3.47(m,14H)、3.03-3.00(m,1H)、2.86-2.82(m,1H)、2.73-2.67(m,1H)、2.20-2.14(m,1H)、1.97(m,1H)、1.80-1.62(m,5H)、1.50(s,9H)、1.44-1.27(m,3H)、1.06-1.04(m,9H)
實施例1:MC1R和MC4R體外活性之比較實驗
製備例中獲得的N-((3S,5S)-1-((3S,4R)-1-(三級-丁基)-4-(4-氯苯基)吡咯啶-3-羰基)-5-(嗎福林-4-羰基)吡咯啶-3-基)-N-((1s,4R)-4-甲基環己基)異丁醯胺鹽酸鹽(以下稱為「試驗化合物」)和作為比較物質的已知為黑皮質素受體促效劑的α-MSH、NDP-α-MSH和MTII(美拉諾坦II)的MC1R和MC4R的活性通過以下的螢光素酶測定、結合親和力、β-抑制蛋白測定和cAMP測定來測量。結果分別列於表1至表4中。
實施例1-1:螢光素酶測定
為了測量對MC1R(黑皮質素-1受體)與MC4R(黑皮質素-4受體)的促效劑能力,而建立了在CRE(cAMP響應元件)控制下永久表達MC1R、MC4R和螢光素酶基因(CRE-LUC)的細胞株。製備含有MC1R和MC4R基因的哺乳動物細胞表達載體(pCDNA3(Neo))(Invitrogen)後,藉由使用Lipofectamine 2000(Invitrogen)與表達螢光素酶基因(CRE-LUC)的載體(pCRE-Luc)(Stratagen)一起在cAMP反應元件(CRE)的控制下轉化人胚胎腎(HEK)細胞株。使用含有10%熱滅活胎牛血清(GIBCO/BRL)的Dulbecco’s Modified Eagles Medium(DMEM),在5% CO2的存在下、於37℃的培養箱中將轉化的細胞株(HEK MC1R-Luc及HEK MC4R-Luc)培養24小時。使用含有10ml選擇培養基(10%熱滅活胎牛血清(GIBCO/
BRL)、100單位/ml青黴素(GIBCO/BRL)、100單位/ml鏈黴素(GIBCO/BRL)、800μg/ml遺傳黴素(G418)(GIBCO/BRL)之Dulbecco’s Modified Eagles Medium(DMEM),將細胞株培養4天。藉由使用10ml新的選擇培養基更換培養基以去除被選擇培養基殺死的細胞之過程重複3次,以每4天一次。將最終選擇並繁殖之殖株所形成的個別菌落在顯微鏡下轉移至每孔含1ml選擇培養基的24孔細胞培養板中,培養4天。將毛喉素(SIGMA)處理至10μM的最終濃度,然後在5% CO2存在下於37℃的培養箱中培養5小時。每個孔用50μl Bright-Glo螢光素酶試劑(Promega)處理,並在室溫下放置15分鐘,然後使用光度計(Victor)測量每個孔的發光。選擇經毛喉素處理而展現出基礎值100倍或更高的發光的殖株,並用於測量每種化合物的MC1R和MC4R促效劑能力。
將HEK MC1R-Luc細胞和HEK細胞添加到96孔光度計細胞培養板(Costar)的每個孔中,使其在100μl培養基中的尺寸為2.5×104個細胞,然後在6% CO2存在下、於37℃的培養箱中培養18小時。將使用上述培養基稀釋至各級濃度的MCR促效劑進行處理,以使最終DMSO濃度不超過1%,然後在6% CO2存在下於37℃的培養箱中培養5小時。每個孔用50μl Bright-Glo螢光素酶試劑(Promega)處理,並在室溫下放置5分鐘,然後使用光度計(Victor)測量每個孔的發光。將在稀釋至各級濃度的促效劑所誘導的發光量轉換為相對於由10μM NDP-α-MSH處理所展現的量的相對%值。EC50表示為引起各促效劑可誘導的最大發光量的50%的濃度。使用統計軟體(Prizm)進行測量。
表1顯示以EC50(nM)為單位測量通過上述實驗獲得的各種化合物對MC1R和MC4R的促效劑能力的結果。
實施例1-2結合親和力
在建立了表達人重組MC1R的CHO-K1細胞株和表達MC4R的HEK-293細胞株之後,從每個細胞株收集膜。在96孔細胞培養板中,加入細胞株膜和25mM HEPES-KOH吸附緩衝液(pH 7.0),其含有按各級濃度稀釋的MCR促效劑,並進行反應。結果如表2所示,EC50計算為引起各促效劑可誘導的50%的最大結合的濃度。
實施例1-3:β-抑制蛋白測定
建立Pathlinker eXpress β-抑制蛋白細胞株(U2OS細胞株),其中Prolink(PK)標記的MC1R和MC4R,以及酶受體(EA)標記的β-抑制蛋白一起表達。當該細胞株的MCR-PK部分被活化時,β-抑制蛋白-EA被調動,且β-半乳糖苷酶片段的酶受體(EA)和Prolink(PK)相互作用。活化
的酶藉由β-半乳糖苷酶活性水解受質以產生化學發光信號,從而可測量該活性。將該Pathhunter eXpressβ-抑制蛋白細胞株(U2OS細胞株)培養後,將細胞接種到細胞培養板的每個孔中,並在5% CO2存在下於37℃培養箱中培養48小時。培養後,加入5μl用緩衝液稀釋5倍的樣品,將載體濃度設定為1%,並添加按各級濃度稀釋的MC4R促效劑化合物,然後在37℃下反應90分鐘。每種促效劑化合物的活性(%)表示為100%×(樣品的平均RLU值-載體對照的平均RLU值)/(對照配體的平均值最大值-載體對照的平均RLU值),且該值由CBIS數據分析套件(ChemInnovation,CA)進行分析。表3表示了以EC50(nM)為單位測量通過上述實驗獲得的各化合物的黑皮質素受體之活性能力的結果。
實施例1-4:cAMP之測定
在建立了MC1R和MC4R各自過表達的cAMP Hunter Gs偶聯細胞株(CHO-K1細胞株)而使得因促效劑反應引起的細胞中cAMP水平的增加可被測量之後,將細胞接種到白細胞培養板的每個孔中,並在37℃培養箱中,5% CO2存在下培養24小時。培養後,除去培養基,並加入15μl的2:1 HBBS/10mM HEPES:cAMP XS+Ab試劑。加入5μl用緩衝液稀
釋4倍的樣品後,將載體濃度設定為1%,並添加按各級濃度稀釋的MC4R促效劑化合物,然後在37℃下反應30分鐘。每種促效劑化合物的活性(%)表示為100%×(樣品的平均RLU值-載體對照的平均RLU值)/(最大對照的平均RLU值-載體對照的平均RLU值),且該值藉由CBIS數據分析套件(ChemInnovation,CA)進行分析。表4表示以EC50(nM)為單位測量通過上述試驗獲得的化合物對黑皮質素受體之促效劑能力的結果。
在表1至表4中,EC50值越低,對相應受體的促效能力越好。MC4R的特異性可以通過計算MC1R中的EC50與MC4R中的EC50的比值來確認,該比值越大表明對MC4R的選擇性越好。根據本發明的測試化合物的上述比率為至少5至最大37.98。由此證實,與參與皮膚色素沉著的MC1R相比,本發明的測試化合物對參與體內能量代謝和體重控制之MC4R表現出優異的選擇性。
實施例2 皮膚中藥物濃度和分佈之測量
關於皮膚色素沉著(MC4R促效劑的脫靶效應),在缺乏瘦素受體的db/db小鼠模型中,通過重複給藥後測量皮膚和血漿中的藥物濃度來評估藥物的分佈和積累。結果如圖1所示。
使用了setmelanotide(Ac-RC[dA]H[dF]RWC-NH2(二硫化物)(AcOH鹽))作為對比物質,該對比物質是一種MC4R促效劑肽,與MC1R相比對MC4R的選擇性低,據報導它顯示皮膚臨床試驗中的色素沉著(Clement et al.,Nature Medicine,2018)。
從圖1可以看出,證實了本發明的受試化合物在重複給藥後在皮膚中沒有相對蓄積。
實施例3 皮膚色素沉著的測量
為了確認發生皮膚色素沉著的可能性(MC4R促效劑的脫靶效應),在猴子的重複毒性試驗中測量了皮膚和皮膚毛髮中的色素沉著模型,結果如圖2所示。
從圖2可以看出,在本發明的受試化合物的情況下,證實了當重複給藥2週時,在皮膚和皮膚毛髮上並沒有出現色素沉著。
Claims (8)
- 如請求項1所述之用途,其中該藥學上可接受的鹽係選自由鹽酸、硫酸、硝酸、磷酸、氫溴酸及氫碘酸所構成之群組。
- 如請求項1所述之用途,其中式1之該化合物或其藥學上可接受的鹽的選擇性對黑皮質素-4受體與黑皮質素-1受體的比例為5或更多。
- 如請求項1所述之用途,其中與黑皮質素受體相關的疾病係選自肥胖、糖尿病、發炎及勃起功能障礙所構成之群組。
- 如請求項5所述之用途,其中與黑皮質素受體相關的疾病係肥胖。
- 如請求項1所述之用途,其中皮膚色素沉著減少。
- 如請求項1所述之用途,其中該藥物係口服製劑。
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