覃幼玲+綜述+林栩+
基金項目:廣西高校科研項目(200103YB116)
作者簡介:覃幼玲,女,在讀碩士,研究方向是腎小球疾病基礎與臨床。 Email:qinyouling123@163.com.
▲通信作者:林栩,男,主任醫(yī)師,碩士研究生導師,研究方向是腎小球疾病基礎與臨床。Email:linyyfyy@163.com.
覃幼玲1 綜述,林栩2▲審校
(1.廣西醫(yī)科大學研究生學院,南寧 530021;2.右江民族醫(yī)學院附屬醫(yī)院腎內科,百色 533000)
【關鍵詞】激素耐藥型腎病綜合征;NPHS1;Nephrin
中圖分類號:R692文獻標識碼:A文章編號:10031383(2014)03035804
DOI:10.3969/j.issn.10031383.2014.03.028
在腎小球疾病中,激素耐藥型腎病綜合征(steroidresistant nephrotic syndrom,SRNS)占原發(fā)性腎病綜合征(primary nephrotic syndrom,PNS)的10%~20%,且10年內將從SRNS進展至終末期腎臟病(ESRD)的患者高達30%~40%,是臨床上的一大棘手問題。1998年,腎小球足細胞裂孔隔膜(slit diaphragm,SD)上的分子蛋白nephrin問世,使腎小球的研究提升到分子生物學水平,探討腎小球足細胞相關分子的作用機制,有望為腎病綜合征等腎小球疾病的基因診斷、治療和預后提供新途徑。Nephrin作為SD上首個被發(fā)現(xiàn)的蛋白,其與先天性腎病綜合征(congenital nephrotic syndrome,CNS)等遺傳性和獲得性腎小球疾病相關,nephrin蛋白的減少和分布異??蓪е碌鞍啄虻漠a生和腎臟病理病變[1]。編碼基因NPHS1突變可引起先天性腎病綜合征芬蘭型(congenital nephrotic syndrome of Finland,CNF)和SRNS。下面就NPHS1基因與SRNS的關系作一綜述如下。
1NPHS1和nephrin的結構和功能
NPHS1基因位于19ql3.l,長26 kb,含有29個外顯子,1214個氨基酸,屬于黏附分子免疫球蛋白超家族成員,處于腎小球濾過屏障SD上,是構成足細胞結構的一種重要蛋白[2]。Nephrin蛋白可表達于腎臟、肝臟、心臟、肺、腦、肌肉、胰腺、胎盤等組織。Nephrin與podocin和CD2AP分子結合,共同保障細胞內信號傳導通路的通暢,保持足細胞形態(tài)的完整性。有學者認為nephrin的減少與蛋白尿的發(fā)生密切相關,NPHS1基因突變/多態(tài)性在CNS、微小病變腎?。╩inimal change disease, MCD)等疾病的進展及其蛋白尿的發(fā)生中發(fā)揮重要作用[2]。
2NPHS1基因突變
2.1NPHS1基因突變的臨床病理特點
NPHS1基因突變所致SRNS擁有NS的臨床特點,但缺乏腎外表現(xiàn),幾乎全部患者對激素和免疫抑制劑治療無效,但移植后復發(fā)率低。依據(jù)年齡分為CNS、兒童期SRNS、成年期SRNS共3種類型。CNS起病早、病情重、腎功能進行性減退、激素治療無效、死亡率高、預后極差。研究發(fā)現(xiàn)多數(shù)CNS患兒為低體重早產兒,3個月內發(fā)病,在宮內即有大量蛋白尿,在出生時或出生后幾天即可出現(xiàn)水腫,2~3年快速進展至(endstage renal disease,ESRD)。芬蘭人群CNS患兒腎移植后蛋白尿復發(fā)率為20%~25%,血漿置換可以緩解,L4lfsX91/L41fsX91其特有的基因型,而非芬蘭人群復發(fā)率僅有6%~16.7%,對血漿置換和環(huán)磷酰胺治療敏感。兒童期SRNS多于3個月~14歲8個月發(fā)病,平均4歲8個月,2.4~20年后進展至ESRD,平均8.7年。主要腎臟病理是MCD和局灶節(jié)段性腎小球硬化癥(focal segmental glomerulosclerosis,F(xiàn)SGS),部分為系膜增生性腎小球腎炎(mesangial proliferative glomerulonephritis,MsPGN),腎移植后復發(fā)率是28.7%。成年期SRNS發(fā)病年齡在27~29歲之間,1~5年后進展至ESRD,平均3年,病理類型是FSGS。
2.2NPHS1基因突變與CNS患兒的關系
芬蘭人群CNS中NPHS1基因突變率高達98%,其中94%患者表現(xiàn)為Finmajor121delCT(L41fsX91)和Finminor 3325C>T(R1109X)位點突變,前者占78%,后者為16%。María等[3]研究發(fā)現(xiàn)在芬蘭人群L41fsX90和R1109X突變可致SD結構nephrin蛋白缺失。Machuca等[4]在來自西歐、北美、土耳其107個家族的117例非芬蘭人群CNS患者中檢測出16個家族20例存在NPHS1基因為p.R138Q、p.V260E、p.R229Q三個位點突變,突變率為14.9%(16/107)。Schoeb等[5]在來自土耳其、阿拉伯、歐洲、高加索的62個家族的67名患兒中檢測到36個家族存在NPHS1基因突變,突變率達58%(36/62)。Mbarek等[6]在來自突尼斯的13個家族24例CNS和SRNS患兒中檢測出7個家族存在NPHS1基因突變,突變率為53.8%(7/13)。Ovunc等[7]在來自高加索、土耳其、阿拉伯等7個國家和地區(qū)的20個家族23例CNS患兒中檢測到9個家族存在NPHS1基因突變,突變率為45%(9/20)。Fylaktou等[8]在2例希臘CNS患者檢測到NPHS1基因c.1096A > C(pS366R)純合突變和c.1096A > C(pS366R)、c.649_650delGT (p.Cys217fsX)、c.791C>G(p.P264R)3種復合雜合突變。Wu等[9]在1例家族性CNS患兒檢測到NPHS1基因突變c.2783C>A和c.2225T>C突變。Yu等[10]在1例中國散發(fā)性CNS兒童檢測到NPHS1基因3250insG(V1084fsX1095)純合突變。米榮等人[11]在1例CNS患兒檢測出NPHS1基因G928A(D310)、IVS18(+5G>A)突變和SNP位點E117K(rs3814995)。
3NPHS1基因突變與SRNS的關系
3.1NPHS1基因突變與家族性兒童期SRNS的關系
孟大川[12]課題組在中國南方漢族3例家族性SRNS中檢測到1例存在NPHS1基因雜合突變2398C>T(R800C)和4個SNP位點349G>A、IVS24+36C>T、3315G>A和 IVS27+45C,突變率為33.3%(1/3)。Abid等[13]在145名巴基斯坦SRNS患兒檢測到7例家族性SRNS患者存在NPHS1純合突變,突變率為4.8%(7/145)??梢?,家族性兒童期SRNS的NPHS1基因突變率在48%~333%之間[12,13]。
3.2NPHS1基因突變與散發(fā)性兒童期SRNS的關系
Caridi等[14]研究人員在40例SRNS患者中檢測出NPHS1基因雜合突變7例,突變率分別為175%(7/40)。然而,Buscher等[15]德國課題組于65例散發(fā)性SRNS患兒中篩查出1例存在NPHS1基因復合雜合突變,突變率是1.5%(1/65)。2013年,Dincel等[16]在1例SRNS患者檢出NPHS1基因SNP位點E117K和NPHS2基因突變P118L,提示NPHS1基因SNP位點E117K改變了腎小球足細胞的信號傳導通路,從而導致NPHS2基因P118L位點突變。Behbahan等[17]在伊朗西南部20例SRNS兒童中檢測出8例存在NPHS1基因突變,檢出率為40%(8/20)。王道靜等[18]在40例中國南方漢族散發(fā)性SRNS兒童中檢測到6例存在NPHSl基因突變928G>A(D310N)、2677A>G(T893A)、2869G>C(V957L)、IVS8+30C>T、IVS21+14G>A、IVS2523C>T和+142T>C,突變率為15%(6/40)。封東寧等[19]于10例中國散發(fā)性SRNS患者檢測出1例攜帶NPHS1基因復合雜合突變2677A>G(T893A)和142T>C,檢出率為10%(1/10);在20例緩解性SRNS患兒中檢測到4例NPHS1基因單雜合突變928G>A、IVS8+30C>T、IVS21+14G>A和IVS2523C>T,檢出率為20%(4/20)。可見,散發(fā)性兒童期SRNS患兒的NPHS1基因突變檢出率在10%~40%之間[14~19]。
3.3NPHS1基因突變與成年期SRNS的關系
Santín等[20]在89個家族的97例散發(fā)性SRNS患者檢測到5個家族性和7例散發(fā)性SRNS者存在NPHS1基因突變,檢出率為23.1%(12/52),發(fā)病年齡最大的是27歲。Luo等[21]在36例MCD成人SRNS檢測到NPHS1基因SNP位點G349A。
4NPHS1基因突變的臨床意義
NPHS1基因突變分析對SRNS患者的病因診斷、指導治療和判斷預后等具有指導意義,為該基因突變的高危家庭進行產前診斷,提供遺傳咨詢,為SRNS患者提供新的靶向治療途徑。
4.1有助于指導病因診斷及臨床治療
在芬蘭,CNS患兒NPHS1基因突變率高達98%,而非芬蘭人群CNS患兒NPHS1突變率為14.9%~58%[4~7]。目前,家族性兒童期SRNS最高檢出率為33.3%[12],散發(fā)性兒童期SRNS最高檢出率為40%[17],成年期SRNS為23.1%[18]。為此,進行NPHS1基因檢測有助于SRNS患者的臨床病因診斷。Godefroid[22]研究提示,血管緊張素轉換酶抑制劑(ACEI)與吲哚美辛聯(lián)合用藥對NPHS1基因突變的20%CNS患者有效,但仍需結合患者的基因背景和臨床結果來評估其藥物治療的潛在性和安全性。存在NPHS1基因純合或復合雜合突變的SRNS患兒對激素和免疫抑制劑耐藥,故此類患者可直接進入腎移植,復發(fā)率低,也避免了骨髓抑制、股骨頭壞死等嚴重的副作用。
4.2有助于判斷疾病預后及產前診斷和遺傳咨詢
NPHS1 基因突變引起的 SRNS 的發(fā)病年齡呈低齡化,包括先天性和后天獲得性腎病[23]。其中,NPHS1基因引起的CNS患者可迅速進展到ESRD,僅短短的2~3年時間,但對于兒童期SRNS患兒相對較長,平均為8.7年。相關報道顯示,NPHS1突變引起的SRNS患者發(fā)病年齡越大癥狀越輕[14],突變率越低[24],其進展至ESRD的時間越長。為此,NPHS1基因突變引起的CNS和兒童期SRNS患兒明確診斷后,就能預測其發(fā)展至ESRD的時間,為早期進入腎移植階段做好準備。芬蘭CNS患兒腎移植后蛋白尿復發(fā)率為20%~25%,而非芬蘭人群復發(fā)率較低,為6%~16.7%;兒童期SRNS患兒復發(fā)率最高,為28.7%??梢?,NPHS1基因突變檢測結果可判斷NS患兒腎移植的預后。而開展SRNS患者的NPHS1基因檢測,有利于確定患兒父母所攜帶的突變位點,為突變高危家庭提供遺傳咨詢,使產前診斷具有充分的實驗室依據(jù)[25]。
5展望
目前,關于NPHS1基因突變所致的SRNS的研究還存在很多疑問,例如NPHS1基因編碼蛋白nephrin受哪些相關因子的調控,作用機制如何;NPHS1基因除了引起CNS外,還可導致其他哪些腎?。籒PHS1基因型和等位基因與腎臟疾病的關系是怎樣的。NPHS1基因突變所致的SRNS的研究僅限于小樣本,尚缺乏多樣本多基因的研究。芬蘭、法國、西班牙、德國、意大利、中國漢族等人群已有相關報道,其他人群的突變情況如何尚未明朗,例如NPHS1在我國壯族人群中的基因突變情況尚未明確,尚需進一步研究。
參考文獻
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(收稿日期:2014-01-15修回日期:2014-06-13)
(編輯:潘明志)
[7] Fylaktou I,Megremis S,Mitsioni A,et al.Novel and known nephrin gene(NPHS1) mutations in two Greek cases with congenital nephrotic syndrome including a complex genotype[J].J Genet,2013,92(3):577581.
[8] Wu L,Hu J,Xue J,et al.Two novel NPHS1 mutations in a Chinese family with congenital nephrotic syndrome[J].Genetics and Molecular Research,2011,10(4):25172522.
[9] Yu Z,Wang D,Meng D,et al.Mutations in NPHS1 in a Chinese child with congenital nephrotic syndrome[J].Genetics and Molecular Research,2012,11(2):14601464.
[10]米榮,王曉穎,康利民,等.先天性腎病綜合征1例報告及文獻復習[J].北京醫(yī)學,2013,35(4):253256.
[11]孟大川,王道靜,余自華,等.中國南方漢族人3個家族性激素耐藥型腎病綜合征家系CD2AP和NPHS1基因突變分析[J].實用兒科臨床雜志,2011,26(5): 329332+344.
[12]Abid A,Khaliq S,Shahid S,et al.A spectrum of novel NPHS1 and NPHS2 gene mutations in pediatric nephrotic syndrome patients from Pakistan[J].Gene,2012,502(2):133137.
[13]Santin S,GarcíaMaset R,Ruíz P,et al.Nephrin mutations cause childhoodand adultonset focal segmental glomerulosclerosis[J].Kidney Int,2009,76(12): 12681276.
[14]Caridi G,Gigante M,Ravani P,et al.Clinical Features and LongTerm Outcome of Nephrotic Syndrome Associated with Heterozygous NPHS1 and NPHS2 Mutations[J].Clin J Am Soc Nephrol,2009,4(6): 10651072.
[15]Buscher AK,Kranz B,Boscher R,et a1.Immunosuppression and renal outcomeincongenitaland pediatric steroid resistant nephrotic syndrome[J].Clin J Am Soc Nephrol,2010,5(11):20752084.
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(收稿日期:2014-01-15修回日期:2014-06-13)
(編輯:潘明志)
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[24]Philippe A,Nevo F,Esquivel EL,et al.Nephrin mutationscan cause childhoodonset steroidresistant nephrotic sy ndrome[J].J Am Soc Nephrol,2008,19(10):18711878.
[25]于力.兒童腎臟病與基因突變[J].臨床兒科雜志,2010,28(4):307311.
(收稿日期:2014-01-15修回日期:2014-06-13)
(編輯:潘明志)