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基于ACAT1/ABCA1信號(hào)分子探討牛奶對(duì) 金黃地鼠皮脂分泌的影響

2021-06-21 19:59:50吳淑輝朱明芳張曦劉娟張杜

吳淑輝 朱明芳 張曦 劉娟 張杜

〔摘要〕 目的 探討牛奶對(duì)金黃地鼠皮脂分泌的影響及其作用機(jī)制。方法 將18只金黃地鼠隨機(jī)分為空白組、全脂牛奶組、脫脂牛奶組,每組6只。空白組不予任何干預(yù)措施,全脂牛奶組予全脂牛奶灌胃,脫脂牛奶組予脫脂牛奶灌胃,2.5 mL/次,2次/d。于干預(yù)后第0、7、14、21、28天測(cè)量金黃地鼠雙側(cè)皮脂腺斑面積及厚度;并采用免疫組化法檢測(cè)金黃地鼠皮脂腺斑ACAT1/ABCA1信號(hào)分子表達(dá)水平;采用HE染色觀察皮脂腺斑病理組織學(xué)變化。結(jié)果 各組間皮脂腺斑面積無(wú)明顯差異(P>0.05);與空白組相比,全脂牛奶組及脫脂牛奶組皮脂斑厚度明顯增厚,差異具有統(tǒng)計(jì)學(xué)意義(P<0.05);與空白組相比,全脂牛奶組ACAT1 OD值明顯升高,差異具有統(tǒng)計(jì)學(xué)意義(P<0.05);各組間ABCA1 OD值無(wú)明顯差異(P>0.05)。與空白組相比,全脂牛奶組及脫脂牛奶組金黃地鼠皮脂腺腺體肥大,數(shù)量較多,呈分葉狀分布,排列緊密。結(jié)論 牛奶可能通過(guò)ACAT1信號(hào)分子調(diào)控皮脂脂質(zhì)分泌。

〔關(guān)鍵詞〕 牛奶;金黃地鼠;皮脂腺斑;ACAT1;ABCA1

〔中圖分類(lèi)號(hào)〕R275? ? ? 〔文獻(xiàn)標(biāo)志碼〕A? ? ? ?〔文章編號(hào)〕doi:10.3969/j.issn.1674-070X.2021.05.007

Effects of Milk on Sebum Secretion in Golden Hamsters Based on ACAT1/ABCA1

Signaling Molecules

WU Shuhui, ZHU Mingfang*, ZHANG Xi, LIU Juan, ZHANG Du

(The Second Affiliated Hospital of Hunan University of Chinese Medicine, Changsha, Hunan 410005, China)

〔Abstract〕 Objective To explore the effect and possible mechanism of milk on sebaceous gland spot of golden hamsters. Methods 18 golden hamsters were randomly divided into the blank group, whole milk group, skim milk group and control group, with 6 rats in each group. The blank group was not given any intervention measures. The whole milk group was given whole milk by gavage, and the skim milk group was given skim milk by gavage, 2.5 mL/time, twice a day. The area and thickness of bilateral sebaceous glands of golden hamsters were measured at 0, 7, 14, 21 and 28 days after intervention. The expression levels of ACAT1/ABCA1 signaling molecules in the sebaceous spots of golden hamsters were detected by immunohistochemistry. The histopathological changes of sebaceous spots were observed by HE staining. Results The sebaceous gland spots sizes in groups didnt show great significance (P>0.05). Compared with the blank group, the thickness of sebaceous spots in the whole milk group and skim milk group was increased significantly, and the difference was statistically significant (P<0.05). The expression of ACAT1 in whole milk group was significant higher than that in blank group, the difference was statistically significant (P<0.05). There were no differences in the optical density (OD) of ABCA1 among groups (P>0.05). Compared with the blank group, sebaceous gland spot of golden hamsters in the whole milk group and the skim milk group were hypertrophic and more numerous, with lobulated distribution and close arrangement. Conclusion Milk may regulate sebum lipid secretion through ACAT1 signaling molecule.

空白組皮脂腺葉無(wú)明顯分葉結(jié)構(gòu),排列較為疏松,厚度較全脂牛奶組及脫脂牛奶組略薄;與空白組相比,全脂牛奶組及脫脂牛奶組皮脂腺腺體肥大,數(shù)量較多,呈分葉狀分布,排列緊密。見(jiàn)圖2。

3 討論

痤瘡發(fā)病機(jī)制復(fù)雜多樣,遺傳背景下激素誘導(dǎo)的皮脂腺過(guò)度分泌脂質(zhì)、毛囊皮脂腺導(dǎo)管角化異常、痤瘡丙酸桿菌等毛囊微生物增殖及炎癥和免疫反應(yīng)等與之相關(guān),其中皮脂腺過(guò)度分泌脂質(zhì)被認(rèn)為是痤瘡發(fā)生的前提條件,皮脂過(guò)分泌在痤瘡中發(fā)揮重要作用[14]。本課題組前期對(duì)長(zhǎng)沙市區(qū)內(nèi)在校青少年乳制品消費(fèi)與痤瘡患病情況開(kāi)展流行病學(xué)調(diào)查,結(jié)果表明全脂牛奶、低脂牛奶和脫脂牛奶攝入的人群患痤瘡的風(fēng)險(xiǎn)均高于不喝牛奶的人群,OR值(95%CI)分別為3.46(1.18-10.11)、3.50(1.18-10.40)和46.28(5.02-427.00)[15],基于此,本課題從皮脂角度進(jìn)一步探究牛奶在痤瘡發(fā)病中的作用,以期為痤瘡患者提供飲食指導(dǎo)。

在高脂血癥或高膽固醇血癥條件作用下,游離膽固醇可在內(nèi)質(zhì)網(wǎng)通過(guò)ACAT1作用被酯化,導(dǎo)致膽固醇酯化,形成泡沫狀巨噬細(xì)胞[16-18];而上調(diào)ABCA1表達(dá)則可促進(jìn)巨噬細(xì)胞內(nèi)膽固醇及磷脂流出,抑制巨噬細(xì)胞泡沫化,改善動(dòng)脈粥樣硬化[19-21]。除了動(dòng)脈粥樣硬化,研究[16,22-25]表明,阿爾茨海默病、糖尿病、鞘磷脂沉積病等多種脂質(zhì)代謝紊亂疾病與ACTA1/ABCA1信號(hào)分子功能失調(diào)密切相關(guān)。近年研究表明,脂質(zhì)代謝紊亂參與誘導(dǎo)痤瘡發(fā)生發(fā)展,Melnik等[26-27]更提出痤瘡是一種發(fā)生于毛囊皮脂腺的代謝綜合征。Zhou M等[28]檢測(cè)了59名嬰兒痤瘡患者皮脂成分及含量,結(jié)果表明,相比正常對(duì)照組,痤瘡患兒表面脂質(zhì)成分明顯改變,脂肪酰基、甘油磷脂、鞘磷脂、甾醇脂質(zhì)、糖脂類(lèi)明顯上升,孕烯醇酮脂類(lèi)則明顯下降;并重點(diǎn)檢測(cè)了甘油三酯、甘油二酯、神經(jīng)酰胺類(lèi)脂質(zhì)游離脂肪酸、磷脂質(zhì),發(fā)現(xiàn)患兒表面皮脂甘油三酯、游離脂肪酸含量明顯上升,甘油二酯含量與甘油三酯含量成比例關(guān)系,磷脂質(zhì)平均鏈長(zhǎng)明顯減低導(dǎo)致患兒皮膚屏障功能下降。Zhou M等[29]研究表明,在青少年痤瘡患者皮脂中甘油磷脂、不飽和游離脂肪酸、甾醇類(lèi)脂質(zhì)含量明顯上升,孕烯醇酮脂類(lèi)、糖脂類(lèi)含量明顯下降,甘油脂類(lèi)、鞘磷脂含量相比對(duì)照組無(wú)明顯改變。以上研究表明皮脂代謝紊亂在痤瘡發(fā)生發(fā)展中發(fā)揮重要作用,基于此,本研究從皮脂代謝紊亂角度進(jìn)一步探究牛奶在痤瘡中的作用。

本研究發(fā)現(xiàn)與空白組相比,全脂牛奶組及脫脂牛奶組皮脂腺斑厚度明顯增厚(P<0.05),然而各組皮脂腺斑面積無(wú)明顯差異,不排除由于測(cè)量誤差及喂養(yǎng)時(shí)間較短等因素造成影響。與空白組相比,全脂牛奶組ACTA1表達(dá)上調(diào)(P<0.05),這表明牛奶可能通過(guò)上調(diào)ACAT1表達(dá)影響皮脂膽固醇代謝,進(jìn)而誘導(dǎo)皮脂脂質(zhì)代謝紊亂,加重痤瘡發(fā)生,然而各組間ABCA1表達(dá)無(wú)明顯差異,不排除由于實(shí)驗(yàn)動(dòng)物數(shù)量較少及喂養(yǎng)時(shí)間較短等各方面原因造成的假陰性,仍需進(jìn)一步實(shí)驗(yàn)驗(yàn)證;同時(shí)本研究采用金黃地鼠皮脂腺斑面積大小作為其皮脂分泌改變指標(biāo),方法簡(jiǎn)便直觀,然尚欠缺一定精準(zhǔn)性,故本實(shí)驗(yàn)存在一定局限性,仍有待進(jìn)一步實(shí)驗(yàn)證實(shí)。

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