摘要:目的探討馬骨續(xù)筋膠囊對(duì)老年大鼠髖部骨折愈合及基質(zhì)細(xì)胞衍生因子-1(SDF-1)/CXC型趨化因子受體4(CXCR4)信號(hào)通路的影響。方法構(gòu)建老年大鼠髖部骨折模型,將造模成功大鼠隨機(jī)分為模型組,馬骨續(xù)筋膠囊低、高劑量組,馬骨續(xù)筋膠囊高劑量+通路抑制劑(AMD3100)組,每組12只,另取12只健康大鼠作為對(duì)照組。X線片觀察大鼠髖部骨折愈合情況并進(jìn)行Garrett評(píng)分;酶聯(lián)免疫吸附試驗(yàn)(ELISA)檢測(cè)血清骨折愈合相關(guān)炎癥因子腫瘤壞死因子-α(TNF-α)和白細(xì)胞介素-10(IL-10)水平;CT掃描分析測(cè)定骨體積分?jǐn)?shù)(BV/TV)與骨表面積/體積比(BS/BV);免疫組化檢測(cè)骨折愈合因子胰島素樣生長(zhǎng)因子(IGF)-1、骨形態(tài)發(fā)生蛋白(BMP)-2表達(dá);Western blot檢測(cè)SDF-1/CXCR4信號(hào)通路相關(guān)蛋白表達(dá)。結(jié)果模型組較對(duì)照組Garrett評(píng)分、IL-10水平、BV/TV、BS/BV及IGF-1、BMP-2、SDF-1、CXCR4表達(dá)降低,TNF-α水平升高(P<0.05);馬骨續(xù)筋膠囊低、高劑量組較模型組Garrett評(píng)分、IL-10水平、BV/TV、BS/BV及IGF-1、BMP-2、SDF-1、CXCR4表達(dá)升高,TNF-α水平降低(P<0.05);馬骨續(xù)筋膠囊高劑量+AMD3100組較馬骨續(xù)筋膠囊高劑量組Garrett評(píng)分、IL-10水平、BV/TV、BS/BV及IGF-1、BMP-2、SDF-1、CXCR4表達(dá)降低,TNF-α水平升高(P<0.05)。結(jié)論馬骨續(xù)筋膠囊可促進(jìn)老年大鼠髖部骨折愈合,其作用機(jī)制可能與激活SDF-1/CXCR4信號(hào)通路有關(guān)。
關(guān)鍵詞:髖骨折;骨折愈合;趨化因子CXCL12;受體,CXCR6;馬骨續(xù)筋膠囊
中圖分類號(hào):R683文獻(xiàn)標(biāo)志碼:A DOI:10.11958/20241261
Magu Xujin capsule promotes hip fracture healing in aged rats throughSDF-1/CXCR4 signaling pathway
HOU Xiuxiu,XING Baorui,F(xiàn)ENG Yuanchao,ZHANG Yadi
Department of Trauma Orthopedics,Cangzhou Hospital of Integrated Traditional Chinese and Western Medicine,Cangzhou 161001,China
Abstract:Objective To explore the effects of Magu Xujin capsule on hip fracture healing and stromal cell-derived factor-1/CXC chemokine receptor 4(SDF-1/CXCR4)signaling pathway in elderly hip fracture rats.Methods The hip fracture model of aged rats was established,and successfully modeled rats were randomly separated into the model group,the low-dose Magu Xujin capsule group,the high-dose Magu Xujin capsule group,the high-dose Magu Xujin capsule+pathway inhibitor group(the high-dose Magu Xujin capsule and AMD3100 group),with 12 rats in each group.An additional 12 healthy rats were selected as the control group.X-ray was used to observe the healing of hip fractures in rats,and Garrett score was performed.Enzyme-linked immunosorbent assay(ELISA)was applied to detect serum levels of inflammatory factors related to fracture healing,such as tumor necrosis factor-alpha(TNF-α)and interleukin-10(IL-10).CT scanning analysis was used to determine bone volume fraction(BV/TV)and bone surface area/volume ratio(BS/BV).Immunohistochemistry was applied to detect the expression of fracture healing factor insulin-like growth factor-1(IGF-1)and bone morphogenetic protein-2(BMP-2).Western blot assay was applied to detect the expression of SDF-1/CXCR4 signaling pathway related proteins.Results Garrett score,IL-10 level,BV/TV,BS/BV,the IGF-1,BMP-2,SDF-1 and CXCR4 expression were lower in the model group than those in the control group,while TNF-αlevel was higher(P<0.05).Garrett score,IL-10 level,BV/TV,BS/BV,IGF-1,BMP-2,SDF-1 and CXCR4 expression were higher in the low-dose and high-dose MaguXujin capsule groups than those in the model group,while TNF-αlevel was lower(P<0.05).Garrett score,IL-10 level,BV/TV,BS/BV,IGF-1,BMP-2,SDF-1 and CXCR4 expression were lower in the high-dose Magu Xujin capsule+AMD3100 group than those in the high-dose Magu Xujin capsule group,while TNF-αlevel was higher(P<0.05).Conclusion Magu Xujin capsule can promote hip fracture healing in aged rats,and its mechanism may be related to the activation of SDF-1/CXCR4 signaling pathway.
Key words:hip fractures;fracture healing;chemokine CXCL12;receptors,CXCR6;MaguXujin capsule
老年髖部骨折是臨床常見骨科疾病,也是骨相關(guān)疾病致殘、致死的主要原因之一。老年人機(jī)體功能衰退,骨質(zhì)量及強(qiáng)度急速下降,致使摔倒等一些輕微損傷就能導(dǎo)致髖部骨折,嚴(yán)重影響老年人生活質(zhì)量及生命安全[1]。目前主要通過手術(shù)方式治療老年髖部骨折,但其疼痛劇烈且術(shù)后恢復(fù)時(shí)間長(zhǎng);另外,長(zhǎng)期臥床易引發(fā)一系列并發(fā)癥,嚴(yán)重影響生活質(zhì)量[2]。故尋求安全高效藥物促進(jìn)老年髖部骨折愈合是目前的研究重點(diǎn)。馬骨續(xù)筋膠囊由骨碎補(bǔ)、土鱉蟲、煅自然銅、馬錢子、續(xù)斷、乳香、麻黃、沒藥、甜瓜子等多味中藥材組方,具有消腫止痛、活血祛瘀、溫散舒筋、續(xù)筋接骨的功效。研究顯示,馬骨續(xù)筋膠囊聯(lián)合可調(diào)背伸外固定支具治療胸腰椎壓縮性骨折,可改善患者的骨代謝水平,增加骨密度,緩解疼痛[3]?;|(zhì)細(xì)胞衍生因子-1(stromal cell derived factor-1,SDF-1)/CXC型趨化因子受體4(CXC-type chemokine receptor 4,CXCR4)信號(hào)通路參與機(jī)體多個(gè)生理病理進(jìn)程,其中包括骨折愈合,上調(diào)SDF-1、CXCR4表達(dá)可誘導(dǎo)骨痂形成,改善骨痂微結(jié)構(gòu)和力學(xué)性能,從而加快骨折部位的愈合[4]。本研究通過探究馬骨續(xù)筋膠囊對(duì)老年髖部骨折大鼠骨折愈合及SDF-1/CXCR4信號(hào)通路的影響,為治療老年髖部骨折尋求新策略。
1材料與方法
1.1實(shí)驗(yàn)動(dòng)物及主要材料60只20月齡SPF級(jí)健康雄性SD大鼠購(gòu)自鄭州大學(xué)河南省實(shí)驗(yàn)動(dòng)物中心,生產(chǎn)許可號(hào):SCXK(豫)2022-0001,平均體質(zhì)量(600±20)g。馬骨續(xù)筋膠囊為本院院內(nèi)制劑。CXCR4抑制劑AMD3100購(gòu)自武漢博歐特生物科技有限公司。腫瘤壞死因子(TNF)-α和白細(xì)胞介素(IL)-10酶聯(lián)免疫吸附試驗(yàn)(ELISA)試劑盒購(gòu)自杭州聯(lián)科生物技術(shù)股份有限公司;兔源多克隆胰島素樣生長(zhǎng)因子(IGF)-1、骨形態(tài)發(fā)生蛋白(BMP)-2一抗購(gòu)自武漢菲恩生物科技有限公司。兔源多克隆SDF-1、CXCR4一抗購(gòu)自上海恒斐生物科技有限公司。兔源多克隆β-actin一抗、HRP標(biāo)記的山羊抗兔二抗購(gòu)自上海雅酶生物醫(yī)藥科技有限公司。BX51顯微鏡購(gòu)自日本Olympus公司。ReadMax1500型酶標(biāo)儀購(gòu)自上海閃譜生物科技有限公司。4200SF型凝膠成像分析系統(tǒng)購(gòu)自上海天能公司。
1.2方法
1.2.1老年大鼠髖部骨折模型構(gòu)建麻醉固定大鼠,消毒后在髖部中心左右定位切口,暴露并固定髖關(guān)節(jié),骨科牙鉆完全離斷髖部中段,暴露骨髓腔,克氏針雙側(cè)逆行插入骨髓腔內(nèi)固定,逐層縫合傷口,給予加熱毯保溫并注射青霉素預(yù)防感染[5]。若活動(dòng)大鼠下肢明顯可見骨折斷端分離、畸形、移位等骨折特有體征,表示造模成功。
1.2.2分組與處理采用簡(jiǎn)單隨機(jī)抽樣將造模成功大鼠分為模型組,馬骨續(xù)筋膠囊低、高劑量組和馬骨續(xù)筋膠囊高劑量+AMD3100組,每組12只;另取12只健康大鼠作為對(duì)照組。馬骨續(xù)筋膠囊低、高劑量組分別每日3次服用中成藥馬骨續(xù)筋膠囊1.5、3 g,服藥劑量根據(jù)人與大鼠之間劑量換算而得[6],馬骨續(xù)筋膠囊高劑量+AMD3100組每日3次服用中成藥馬骨續(xù)筋膠囊3 g及每12 h皮下注射AMD3100 0.86 mg/kg,注射劑量根據(jù)大小鼠之間劑量換算而得[7];連續(xù)治療12周。
1.2.3髖部骨折愈合情況檢測(cè)各組大鼠給藥結(jié)束后處死,取髖部組織,X線片觀察大鼠髖部骨折愈合情況并進(jìn)行Garrett評(píng)分。0分,無橋接、骨痂生成;1分,無橋接,骨折端附近有明顯原始骨痂形成;2分,至少一側(cè)皮質(zhì)有骨橋,骨折端周圍骨痂形成顯著;3分,雙側(cè)骨皮質(zhì)均有骨橋,并且骨痂塑形。
1.2.4骨折愈合相關(guān)炎癥因子水平檢測(cè)各組大鼠處死前尾靜脈取血,靜置后3 000 r/min離心15 min,取血清,ELISA試劑盒檢測(cè)血清TNF-α和IL-10水平。
1.2.5骨體積分?jǐn)?shù)與骨表面積/體積比檢測(cè)X線片觀察結(jié)束后,每組取6個(gè)髖部組織置于4%多聚甲醛,然后采用CT掃描檢測(cè)骨體積分?jǐn)?shù)(BV/TV)與骨表面積/體積比(BS/BV)。
1.2.6免疫組化檢測(cè)骨折愈合相關(guān)蛋白表達(dá)將1.2.5髖部組織掃描后,制成石蠟切片常規(guī)脫蠟至水,抗原修復(fù),清除內(nèi)源性過氧化物酶,血清封閉,將切片與IGF-1、BMP-2一抗4℃冰箱孵育,次日與HRP標(biāo)記的二抗孵育,再進(jìn)行DAB顯影,蘇木精染色,漂洗后干燥密封,顯微鏡觀察并收集圖像進(jìn)行光密度(OD)值分析。
1.2.7 Western blot檢測(cè)SDF-1/CXCR4信號(hào)通路相關(guān)蛋白表達(dá)將各組剩余6個(gè)髖骨組織與預(yù)冷蛋白裂解液充分反應(yīng)制成勻漿,提取總蛋白并定量,根據(jù)蛋白樣大小進(jìn)行SDS-PAGE,轉(zhuǎn)PVDF膜后血清封閉,將膜與SDF-1、CXCR4一抗4℃冰箱孵育,次日與HRP標(biāo)記的二抗孵育,ECL可視化處理,凝膠成像系統(tǒng)采集圖像并進(jìn)行灰度分析,計(jì)算相對(duì)表達(dá)量。
1.3統(tǒng)計(jì)學(xué)方法采用SPSS 25.0進(jìn)行數(shù)據(jù)分析,計(jì)量資料均符合正態(tài)分布,以x±s表示,多組間均數(shù)比較采用單因素方差分析,組間多重比較采用LSD-t檢驗(yàn)。P<0.05為差異有統(tǒng)計(jì)學(xué)意義。
2結(jié)果
2.1老年大鼠髖部骨折形態(tài)觀察對(duì)照組大鼠活動(dòng)下肢形體健康正常,模型組活動(dòng)下肢明顯可見骨折斷端分離、畸形、移位等骨折特有體征,見圖1。
2.2馬骨續(xù)筋膠囊對(duì)骨折愈合情況的影響模型組較對(duì)照組Garrett評(píng)分降低(P<0.05);馬骨續(xù)筋膠囊低、高劑量組較模型組Garrett評(píng)分升高(Plt;0.05);馬骨續(xù)筋膠囊高劑量+AMD3100組較馬骨續(xù)筋膠囊高劑量組Garrett評(píng)分降低(P<0.05);見表1。
2.3馬骨續(xù)筋膠囊對(duì)炎癥因子水平的影響模型組較對(duì)照組TNF-α水平升高、IL-10水平降低(Plt;0.05);馬骨續(xù)筋膠囊低、高劑量組較模型組TNF-α水平降低、IL-10水平升高(P<0.05);馬骨續(xù)筋膠囊高劑量+AMD3100組較馬骨續(xù)筋膠囊高劑量組TNF-α水平升高、IL-10水平降低(P<0.05);見表1。
2.4馬骨續(xù)筋膠囊對(duì)BV/TV與BS/BV的影響模型組較對(duì)照組BV/TV、BS/BV降低(P<0.05);馬骨續(xù)筋膠囊低、高劑量組較模型組BV/TV、BS/BV升高(P<0.05);馬骨續(xù)筋膠囊高劑量+AMD3100組較馬骨續(xù)筋膠囊高劑量組BV/TV、BS/BV降低(Plt;0.05);見表2。
2.5馬骨續(xù)筋膠囊對(duì)髖骨組織骨折愈合因子表達(dá)的影響模型組較對(duì)照組IGF-1、BMP-2表達(dá)降低(P<0.05);馬骨續(xù)筋膠囊低、高劑量組較模型組IGF-1、BMP-2表達(dá)升高(P<0.05);馬骨續(xù)筋膠囊高劑量+AMD3100組較馬骨續(xù)筋膠囊高劑量組IGF-1、BMP-2表達(dá)降低(P<0.05);見圖2、表3。
2.6馬骨續(xù)筋膠囊對(duì)髖骨組織SDF-1/CXCR4信號(hào)通路的影響模型組較對(duì)照組SDF-1、CXCR4表達(dá)降低(P<0.05);馬骨續(xù)筋膠囊低、高劑量組較模型組SDF-1、CXCR4表達(dá)升高(P<0.05);馬骨續(xù)筋膠囊高劑量+AMD3100組較馬骨續(xù)筋膠囊高劑量組SDF-1、CXCR4表達(dá)降低(P<0.05);見圖3、表4。
3討論
中醫(yī)認(rèn)為骨折可造成經(jīng)絡(luò)受阻、氣滯血瘀、筋骨失養(yǎng),而行氣止痛、活血祛瘀、強(qiáng)筋健骨則是促進(jìn)骨折愈合的關(guān)鍵。馬骨續(xù)筋膠囊中的骨碎補(bǔ)續(xù)傷止痛、溫經(jīng)通絡(luò)、補(bǔ)腎強(qiáng)骨,土鱉蟲和煅自然銅散瘀止痛、續(xù)筋接骨,馬錢子散結(jié)消腫、通絡(luò)止痛,續(xù)斷補(bǔ)肝腎、續(xù)折傷、強(qiáng)筋骨,乳香行氣活血,麻黃活血祛瘀、宣通陽(yáng)氣,沒藥活血散瘀、消腫生肌,甜瓜子散結(jié)消瘀,諸藥合理配伍可除血瘀、通脈絡(luò),使氣血通暢,關(guān)節(jié)筋肉得以濡養(yǎng),強(qiáng)筋壯骨,促進(jìn)術(shù)后骨折處的快速愈合[8]。研究顯示,中醫(yī)手法復(fù)位孟氏架固定術(shù)后加用馬骨續(xù)筋膠囊治療脛腓骨骨折患者,可有效改善患者臨床癥狀,提高術(shù)后膝關(guān)節(jié)活動(dòng)功能[9]。馬骨續(xù)筋膠囊聯(lián)合微創(chuàng)經(jīng)皮椎弓根螺釘固定術(shù)治療胸腰椎壓縮性骨折患者,可促進(jìn)骨折愈合,恢復(fù)傷椎正常生理結(jié)構(gòu),降低術(shù)后疼痛,改善骨代謝,提高各項(xiàng)生長(zhǎng)因子水平[6]。本研究結(jié)果顯示,馬骨續(xù)筋膠囊可促進(jìn)骨橋連接及骨痂生成,加快骨折愈合。
骨折愈合是一個(gè)包括炎性期、修復(fù)期、重建期的骨重建過程,其過程受炎癥反應(yīng)、營(yíng)養(yǎng)水平、康復(fù)鍛煉等多因素多機(jī)制影響[10-11]。其中,機(jī)體在骨折愈合炎性期出現(xiàn)血腫,骨折部位血管擴(kuò)張、炎性細(xì)胞浸潤(rùn),誘發(fā)炎癥相關(guān)因子TNF-α等大量釋放,提高破骨細(xì)胞的活性并促進(jìn)其分化能力,使中性粒細(xì)胞對(duì)細(xì)胞碎片的吞噬作用增強(qiáng),骨吸收能力提高,成骨細(xì)胞的合成受到抑制,進(jìn)而影響骨折愈合[12-13]。有研究顯示,抑制炎癥因子TNF-α釋放,減輕創(chuàng)傷性骨折大鼠炎癥反應(yīng)可促進(jìn)骨折愈合[14]。IL-10過度表達(dá)可降低TNF-α水平,抑制炎癥反應(yīng),促進(jìn)骨形成,加速糖尿病小鼠股骨骨折修復(fù)[15]。本研究結(jié)果顯示,馬骨續(xù)筋膠囊可降低TNF-α水平、升高IL-10水平,抑制炎癥反應(yīng),改善老年髖部骨折大鼠骨折愈合。
骨折愈合過程離不開骨生長(zhǎng)因子的調(diào)控,因其在誘導(dǎo)成骨、合成骨基質(zhì)、軟骨骨化及重建局部微循環(huán)等過程中發(fā)揮重要作用。BMP-2可誘導(dǎo)未分化的間充質(zhì)細(xì)胞分化為成熟軟骨細(xì)胞和成骨細(xì)胞,被認(rèn)為是較強(qiáng)的骨誘導(dǎo)分化因子;另外,其還可誘導(dǎo)間充質(zhì)細(xì)胞遷徙、增殖、分化,促進(jìn)成骨因子的表達(dá)和成骨細(xì)胞分化,誘導(dǎo)體外成骨,在骨愈合后期還可刺激破骨細(xì)胞分化,參與骨重建。IGF-1是一種結(jié)構(gòu)類似胰島素的多肽,可促進(jìn)骨合成代謝,加速軟骨細(xì)胞的增殖分化,促進(jìn)骨形成;而骨折愈合過程中,其以自分泌、旁分泌的方式分泌,抑制膠原酶合成,減少膠原降解,促進(jìn)骨基質(zhì)合成與礦化。兩者在骨愈合不同階段共同發(fā)揮作用,刺激并誘導(dǎo)成骨細(xì)胞增殖分化,提高成骨細(xì)胞活性,增加骨量,促進(jìn)骨折愈合。研究顯示,上調(diào)BMP-2、IGF-I蛋白等骨折愈合因子的表達(dá)水平,可促進(jìn)股骨骨折愈合[16]。而在顱骨缺損部位注射BMP-2和IGF-1,可促進(jìn)顱骨缺損愈合[17]。本研究結(jié)果顯示,馬骨續(xù)筋膠囊可上調(diào)BMP-2、IGF-1表達(dá),改善老年大鼠髖部骨折的愈合。
SDF-1/CXCR4信號(hào)通路可通過促進(jìn)細(xì)胞增殖、歸巢、募集參與骨折愈合進(jìn)程,即當(dāng)機(jī)體受到刺激時(shí),SDF-1被激活并與其特異性受體CXCR4結(jié)合,參與促進(jìn)成骨細(xì)胞增殖分化進(jìn)程。研究顯示,激活SDF?1/CXCR4信號(hào)通路可促進(jìn)成骨并募集間充質(zhì)干細(xì)胞(mesenchymal stem cells,MSCs),加速顱腦損傷骨折愈合[18],同時(shí)還可上調(diào)骨生成相關(guān)基因,改善骨折愈合,增加骨礦物質(zhì)密度,增加骨強(qiáng)度[19]。本研究結(jié)果顯示,馬骨續(xù)筋膠囊可上調(diào)SDF?1、CXCR4表達(dá),促進(jìn)老年髖部骨折大鼠骨折愈合,推測(cè)其可能通過激活SDF?1/CXCR4信號(hào)通路促進(jìn)骨折愈合。為驗(yàn)證這一猜測(cè),本文利用SDF?1/CXCR4信號(hào)通路抑制劑AMD3100處理馬骨續(xù)筋膠囊高劑量組的髖部骨折老年大鼠,發(fā)現(xiàn)其可部分逆轉(zhuǎn)馬骨續(xù)筋膠囊對(duì)大鼠骨折愈合的促進(jìn)作用。
綜上所述,馬骨續(xù)筋膠囊可促進(jìn)老年大鼠髖部骨折愈合,其作用機(jī)制可能與激活SDF?1/CXCR4信號(hào)通路有關(guān)。本研究尚存在不足之處,如馬骨續(xù)筋膠囊對(duì)老年髖部骨折的作用機(jī)制尚不清楚,且本研究樣本量也較??;老年髖部骨折發(fā)病機(jī)制是復(fù)雜的,但本研究?jī)H從炎癥及骨折愈合因子水平進(jìn)行了探究,后續(xù)還需擴(kuò)大樣本進(jìn)行深入探索論證。
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(2024-09-03收稿2024-10-18修回)
(本文編輯李國(guó)琪)