Rapid Communication Open Access
Copyright ©2006 Baishideng Publishing Group Co., Limited. All rights reserved.
World J Gastroenterol. Jan 7, 2006; 12(1): 127-129
Published online Jan 7, 2006. doi: 10.3748/wjg.v12.i1.127
Influence of HBcAg in liver cell plasma on expression of transforming growth factor-beta 1 in liver tissue of low-grade chronic hepatitis B patients
Yong-Gang Liu, Department of Clinical Hepatitis, Tianjin Infectious Disease Hospital, Tianjin 300192, China
Jian-Hua Lu, Laboratory of Pathology, Shijiazhuang No. 5 Hospital, Shijiazhuang 050021, Hebei Province, China
Xin-Xin Wang, Zhen-Wei Lang, Xin Meng, Li-Jie Zhang, Lin Sun, Shi-Jie Zhang, Jun-Qiang Li, Chen-Zhao Song, Laboratory of Pathology, Capital Medical University Affiliated Youan Hospital, Beijing 100054, China
Jian-Lin Yang, Laboratory of Pathology, Eerduosi No. 2 People’s Hospital, Eerduosi 017000, Inner Mongolia Autonomous Region, China
Co-first-author: Jian-Hua Lu
Supported by the Beijing Science and Technology Commission, No. H020920020290
Correspondence to: Dr. Yong-Gang Liu, Tianjin Infectious Disease Hospital, Tianjin 300192, China. ygwx@public.tpt.tj.cn
Telephone: +86-22-23004472
Received: May 25, 2005
Revised: June 8, 2005
Accepted: June 18, 2005
Published online: January 7, 2006

Abstract

AIM: To study the influence of HBcAg on the expression of transforming growth factor-beta 1 (TGF-β1) in liver tissue of low-grade chronic hepatitis B (CHB) patients.

METHODS: The expression of TGF-β1 and HBcAg in liver samples from 93 low-grade CHB patients was detected by immunohistochemistry and valuated by semi-quantitative scoring.

RESULTS: In the 93 low-grade CHB patients, HBcAg was expressed in cell plasma but not in the liver tissue. There was no significant difference between the two groups.

CONCLUSION: The expression of TGF-β1 is not related with HBcAg expressed as plasma type in the tissues of low-grade CHB patients.

Key Words: HBcAg; Factor-beta 1; Chronic hepatitis B



INTRODUCTION

The incidence rate of chronic hepatitis B (CHB) is high in China. The status of virus replication and the process of hepatic fibrosis are regarded as important. At present, TGF-β1 is known not only as a cytokine which adjusts proliferation, development, conversion, and differentiation of cells, but also as an important transmitter of hepatic fibrosis. It plays an important role in the formationof cirrhosis[1-3]. The synthesis and degradation of extracellular matrix (ECM) are adjusted by it[4,5]. This study was to observe the influence of HBcAg on the expression of TGF-β1 in liver tissue of low-grade CHB patients.

MATERIALS AND METHODS
Reagents

Mouse anti-human TGF-β1 antibody was purchased from Fuzhou Maxim Biotechnology Co., Ltd (Lot No.: 30212238L). The PV-9000 kit was provided by Beijing Zhongshan Golden Bridge Biotechnology Co., Ltd. Rabbit anti-human HBcAg was purchased from Fuzhou Maxim Biotechnology Co., Ltd.

Clinical data

A total of 93 low-grade CHB patients (68 males and 25 females, mean age 33.3 years, ranging from 17 to 56 years) were analyzed. HBcAg was expressed as plasma type in the liver tissue of 50 cases and no HBcAg was expressed in 43 cases. The diagnosis of all cases was coincident with the program of prevention and cure for viral hepatitis[6].

Liver biopsy

The liver biopsy was taken from 93 cases under B ultrasound guidance. The liver tissue longer than 1.0 cm and without break was fixed by formaldehyde solution and embedded in paraffin. Six serial sections (4 μm thick) were prepared for HE, Masson, Gordon Sweet, HBsAg, HBcAg, and TGF-β1.

Immunohistochemistry

TGF-β1 antigen was repaired by microwave in pH 6.0 citrate solutions. The next procedure was performed according to the instructions of PV-9000 kit. TGF-β1 was observed randomly at least in five portal areas under 200 light microscope and the expression of TGF-β1 was evaluated with semi-quantitative scoring method: score 0: no stain or no cell was hyperchromatic or the positive cells were less than 1% of total liver tissues; score 1-4: the areas of positive cells in hepatic lobules, hepatic sinusoid, portal areas, and fibrous plate were 1%-9%, 10%-15%, 16%-20% and more than 20% of total liver tissues, respectively[7].

Statistical analysis

Statistical analyses were carried out with the rank test.

RESULTS
TGF-β1 expression

The positive cells of TGF-β1 were mainly distributed over the focal necrosis and the active fibrosis areas. They were mainly expressed in the interstitial cells of hepatic sinusoid and the inflammatory cells of portal areas. Some bile duct cells and plasma hepatocytes were also expressed.

HBcAg expression

In the 93 low-grade CHB patients, HBcAg was expressed in cell plasma but not in the liver tissue. There was no significant difference between the two groups (H = 0.004, P>0.05, Table 1).

Table 1 Influence of HBcAg in liver cell plasma on the expression of TGF-1 in liver tissue of low-grade CHB patients.
GroupsExpression of TGF-1 protein bysemi-quantitative scoring(Score)
Total
01234
HBcAg expression in cell plasma221923450
No HBcAg expression in liver tissue421320443
DISCUSSION

TGF-β1 is a cluster of active polypeptides with closely correlative structures and similar functions. Five isomers (TGF-β1-5) have been found though TGF-β1 is the main content of TGF-β in human liver and has important functions. It mainly comes from the Kupffer cells (KCs) though hepatic stellate cells (HSCs) can autocrine TGF-β1. TGF-β1 can transfer anti-signals of cell cycle with Smad molecules and inhibit gene transcription of cell cycle correlative proteins[8]. It can inhibit the expression of cyclin related to P70s6k through P70s6k (serine/threonine kinase)[9]. The upregulation of connective tissue growth factor (CTGF) expression is related to TGF-β1[10] and it may be the core of activation in HSCs. TGF-β1 can inhibit the proliferation of quiescent HSCs but cannot inhibit the activated HSCs[11]. In CHB, its serum level is increased[12-15] and its expression in the liver is reinforced[16-18]. TGF-β1 is one of the network cytokines related to hepatic fibrosis and can accelerate the synthesis of ECM and inhibit the degradation of ECM[19]. Following the expression of TGF-β1, the proliferating cell nuclear antigen (PCNA) decreases in the liver[20]. TGF-β1 can inhibit regeneration of hepatocytes[21] and accelerate apoptosis of hepatocytes[22-24], but not HCC cells[25]. Powell et al [26] showed that the risk of developing cirrhosis is higher in hyper-expression than in hypo-expression of TGF-β1.

Some scholars have found that the expression of TGF-β1 in the liver tissues is not related with HBeAg and HBV DNA in the serum of CHB patients[27,28]. In our study, TGF-β1 in the liver tissue of low-grade CHB patients did not influence the status of inflammation and fibrosis with the comparability improved. We found that the expression of TGF-β1 evaluated by semi-quantitative scoring was not related with HBcAg expression in liver cell plasma of low-grade chronic hepatitis B. We suppose that the expression of some cytokines is not related with hepatitis B virus possibly due to the role of virus replication and body immune response.

Footnotes

S- Editor Wang XL and Guo SY L- Editor Elsevier HK E- Editor Li HY

References
1.  Friedman SL. Seminars in medicine of the Beth Israel Hospital, Boston. The cellular basis of hepatic fibrosis. Mechanisms and treatment strategies. N Engl J Med. 1993;328:1828-1835.  [PubMed]  [DOI]  [Cited in This Article: ]
2.  Border WA, Noble NA. Transforming growth factor beta in tissue fibrosis. N Engl J Med. 1994;331:1286-1292.  [PubMed]  [DOI]  [Cited in This Article: ]  [Cited by in Crossref: 2357]  [Cited by in F6Publishing: 2370]  [Article Influence: 79.0]  [Reference Citation Analysis (0)]
3.  Gressner AM. Cytokines and cellular crosstalk involved in the activation of fat-storing cells. J Hepatol. 1995;22:28-36.  [PubMed]  [DOI]  [Cited in This Article: ]
4.  Gressner AM, Weiskirchen R, Breitkopf K, Dooley S. Roles of TGF-beta in hepatic fibrosis. Front Biosci. 2002;7:d793-d807.  [PubMed]  [DOI]  [Cited in This Article: ]  [Cited by in Crossref: 285]  [Cited by in F6Publishing: 319]  [Article Influence: 14.5]  [Reference Citation Analysis (0)]
5.  Roberts AB, Sporn MB, Assoian RK, Smith JM, Roche NS, Wakefield LM, Heine UI, Liotta LA, Falanga V, Kehrl JH. Transforming growth factor type beta: rapid induction of fibrosis and angiogenesis in vivo and stimulation of collagen formation in vitro. Proc Natl Acad Sci U S A. 1986;83:4167-4171.  [PubMed]  [DOI]  [Cited in This Article: ]  [Cited by in Crossref: 1935]  [Cited by in F6Publishing: 2004]  [Article Influence: 52.7]  [Reference Citation Analysis (0)]
6.  The programme of prevention and cure for viral hepatitis Chin J Infect Dis. 2001;19:56-62.  [PubMed]  [DOI]  [Cited in This Article: ]
7.  Peter J, Richard A, Amar P. Scoring of chronic hepatitis. Clin Liver Dis. 2002;6:335-347.  [PubMed]  [DOI]  [Cited in This Article: ]  [Cited by in Crossref: 92]  [Cited by in F6Publishing: 93]  [Article Influence: 4.2]  [Reference Citation Analysis (0)]
8.  Massagué J. TGF-beta signal transduction. Annu Rev Biochem. 1998;67:753-791.  [PubMed]  [DOI]  [Cited in This Article: ]  [Cited by in Crossref: 3492]  [Cited by in F6Publishing: 3480]  [Article Influence: 133.8]  [Reference Citation Analysis (0)]
9.  Petritsch C, Beug H, Balmain A, Oft M. TGF-beta inhibits p70 S6 kinase via protein phosphatase 2A to induce G(1) arrest. Genes Dev. 2000;14:3093-3101.  [PubMed]  [DOI]  [Cited in This Article: ]  [Cited by in Crossref: 171]  [Cited by in F6Publishing: 171]  [Article Influence: 7.1]  [Reference Citation Analysis (0)]
10.  Paradis V, Dargere D, Bonvoust F, Vidaud M, Segarini P, Bedossa P. Effects and regulation of connective tissue growth factor on hepatic stellate cells. Lab Invest. 2002;82:767-774.  [PubMed]  [DOI]  [Cited in This Article: ]
11.  Liu CH, Xan HP. [Effects of transforming growth factor beta1 on the proliferation and type I collagen expression at different differential rat hepatic stellate cells]. Zhonghua Gan Zang Bing Za Zhi. 2003;11:731-734.  [PubMed]  [DOI]  [Cited in This Article: ]
12.  Liu F, Li BS, Man YM, Li SM, Zhang HF, Wang CQ. The effect of serum TGF-β1 of patients with chronic hepatitis B in liver fibrosis formation. Zhonghua Ganbing Zazhi. 1999;7:196-198.  [PubMed]  [DOI]  [Cited in This Article: ]
13.  Sun Y, Xuan S, Xin Y, Lu W, Chu L. [Relationship between serum TGF beta-1 with chronic hepatitis B involving in liver cell function and liver biopsy fibrosis]. Zhonghua Gan Zang Bing Za Zhi. 2002;10:221-222.  [PubMed]  [DOI]  [Cited in This Article: ]
14.  Li HZ, Zhou XP, Mi JP, Zheng MD, Li AY, Chen LF. Relationship between levels of TGF-β1, TNF-α, HA, LN, PCIII in serum of patients with chronic hepatitis B and fibrosis degree analysis of liver tissue. Zhonghua Linchuang Ganbing Zazhi. 2002;18:86-88.  [PubMed]  [DOI]  [Cited in This Article: ]
15.  Liu F, Liu JX, Cao ZC, Li BS, Pei X, Wang LS, Zhang JG. The serum TGF-β1 in the patients with chronic hepatitis B involving in liver cell damage and liver fibrosis formation. Zhonghua Chuanranbing Zazhi. 1999;17:241-244.  [PubMed]  [DOI]  [Cited in This Article: ]
16.  Xin SJ, Wang LJ, Wang SS, Mao YL, Zhang SL, Chen LM. Study on the relationshio between the expression of transforming growth factor-β1 in the liver tissues of viral hepatitis and liver fibrosis. Zhonghua Ganbing Zazhi. 1997;5:66-68.  [PubMed]  [DOI]  [Cited in This Article: ]
17.  Zhang M, Zhang LX, Long JY, Zhao JM, Xin SJ, Wang SS, Xi DP, Cheng Y, Wang LJ. Expression of TGF-β1 and its mRNA in liver tissiues of patients with chronic viral hepatitis. Zhonghua Ganbing Zazhi. 1999;7:193-195.  [PubMed]  [DOI]  [Cited in This Article: ]
18.  Zhang M, Zhang LX, Xin SJ, Zhao JM, Wang SS, Wang LJ. The relationship between transforming growth factor 1 and liver fibrosis. Zhonghua Linchuang Ganbing Zazhi. 2000;16:32-33.  [PubMed]  [DOI]  [Cited in This Article: ]
19.  Shi DL, Savona C, Gagnon J, Cochet C, Chambaz EM, Feige JJ. Transforming growth factor-beta stimulates the expression of alpha 2-macroglobulin by cultured bovine adrenocortical cells. J Biol Chem. 1990;265:2881-2887.  [PubMed]  [DOI]  [Cited in This Article: ]
20.  Delhaye M, Louis H, Degraef C, Le Moine O, Devière J, Peny MO, Adler M, Galand P. Hepatocyte proliferative activity in human liver cirrhosis. J Hepatol. 1999;30:461-471.  [PubMed]  [DOI]  [Cited in This Article: ]  [Cited by in Crossref: 32]  [Cited by in F6Publishing: 33]  [Article Influence: 1.3]  [Reference Citation Analysis (0)]
21.  Fausto N. Hepatocyte apoptosis: is transforming growth factor-B1 the kiss of death. Hepatology. 1993;18:1536-1537.  [PubMed]  [DOI]  [Cited in This Article: ]  [Cited by in Crossref: 2]  [Cited by in F6Publishing: 3]  [Article Influence: 0.1]  [Reference Citation Analysis (0)]
22.  Xin S, Zhao J, Wang L. [Study on relationship between the apoptosis of hepatocytes and liver fibrosis of chronic viral hepatitis]. Zhonghua Shi Yan He Lin Chuang Bing Du Xue Za Zhi. 2000;14:31-33.  [PubMed]  [DOI]  [Cited in This Article: ]
23.  Lang ZW, Meng X, Wang HJ, Luo ZX, Li JQ, Zhang SJ. The relationship between the expression of TGF-β1 and apoptosis in the liver tissue of viral hepatitis. Weichangbingxue He Ganbingxue Zazhi. 1998;7:383.  [PubMed]  [DOI]  [Cited in This Article: ]
24.  Oberhammer FA, Pavelka M, Sharma S, Tiefenbacher R, Purchio AF, Bursch W, Schulte-Hermann R. Induction of apoptosis in cultured hepatocytes and in regressing liver by transforming growth factor beta 1. Proc Natl Acad Sci U S A. 1992;89:5408-5412.  [PubMed]  [DOI]  [Cited in This Article: ]  [Cited by in Crossref: 471]  [Cited by in F6Publishing: 504]  [Article Influence: 15.8]  [Reference Citation Analysis (0)]
25.  Bedossa P, Peltier E, Terris B, Franco D, Poynard T. Transforming growth factor-beta 1 (TGF-beta 1) and TGF-beta 1 receptors in normal, cirrhotic, and neoplastic human livers. Hepatology. 1995;21:760-766.  [PubMed]  [DOI]  [Cited in This Article: ]
26.  Powell EE, Edwards-Smith CJ, Hay JL, Clouston AD, Crawford DH, Shorthouse C, Purdie DM, Jonsson JR. Host genetic factors influence disease progression in chronic hepatitis C. Hepatology. 2000;31:828-833.  [PubMed]  [DOI]  [Cited in This Article: ]  [Cited by in Crossref: 292]  [Cited by in F6Publishing: 299]  [Article Influence: 12.5]  [Reference Citation Analysis (0)]
27.  Cui X, Wang L, Fu CS, Lang ZW. The expression and significance of TGF-β1, α-SMA in the liver tissues of chronic hepatitis B. Shandong Yiyao. 2003;43:18-20.  [PubMed]  [DOI]  [Cited in This Article: ]
28.  Liu YG, Lu JH, Wang XX, Lang ZW, Yang JL, Meng X, Zhang LJ, Sun L, Zhang SJ, Li JQ. The influence of HBV replication on the expression of transforming growth factor-beta1 in the liver tissue of low grade CHB patients. Tianjin Yixue Zazhi. 2004;32:602-603.  [PubMed]  [DOI]  [Cited in This Article: ]