Cloning and functional characterization of the 5'-flanking region of human methionine adenosyltransferase 1A gene

Methionine adenosyltransferase (MAT) is an essential cellular enzyme which catalyses the formation of S-adenosylmethionine, the principal methyl donor and precursor for polyamines. In mammals, two different genes, MAT1A and MAT2A, encode for liver-specific and non-liver-specific MAT respectively. We previously described a switch in the MAT expression from MAT1A to MAT2A in human liver cancer, which offered the cancerous cell a growth advantage. Loss of MAT1A expression was due to lack of gene transcription. To study regulation of the MAT1A gene, we have cloned and characterized a 1.9 kb 5'-flanking region of the human MAT1A gene. One transcriptional start site, located 25 nt downstream from a consensus TATA box, was identified by primer extension and RNase protection assays. The promoter contains several consensus binding sites for CAAT enhancer binding protein (C/EBP) and hepatocyte-enriched nuclear factor (HNF), transcriptional factors important in liver-specific gene expression. The human MAT1A promoter was able to efficiently drive luciferase expression in Chang cells, a human liver cell line, but not in HeLa cells. Sequential deletion analysis of the promoter revealed two DNA regions upstream of the translational start site, -705 to -839 bp and -1111 to -1483 bp, which are involved in positive and negative gene regulation, respectively. Specific protein binding to these regions was confirmed by electrophoretic-mobility-shift and DNase I footprinting assays. Similar to the situation with the rat MAT1A, glucocorticoid treatment also increased human MAT1A expression and promoter activity in a dose- and time-dependent manner.

[Identification of telomerase activity in the experimental carcinogenesis of oral cavity]

OBJECTIVE

Telomerase is a ribonucleoprotein enzyme which synthesizes telomere DNA repeat sequences and maintain stably telomere length. The activity of telomerase may be necessary for the growth of immortalized cells overcoming cellular senescence. The researches have shown that telomerase activities are associated with most cancers. The purpose of the study is to detect the development of telomerase activity during golden hamster cheek pouch carcinogenesis induced by DMBA.

METHODS

First, 52 golden hamsters were divided into 2 groups. Four of them were not done any special treatment and were killed after 3 days. The others were covered with DMBA on the surface of cheek pouch on one side in order to induce carcinogenesis, the other side of cheek pouch was treated as the control. Then, the 48 golden hamsters were divided into 4 groups and were killed in 7, 10, 14 and 20 weeks. The telomeric repeat amplification protocol (TRAP) based on PCR and ELISA was used to analysis the activity of telomerase.

RESULTS

1. The expression of telomerase activity existed in normal cheek pouch mucosa of golden hamsters, which meant that telomerase played an important role on controlling cell proliferation. 2. The level of telomerase activity gradually increased while hyperplasia and dysplasia was observed in the cheek pouch mucosa covered with DMBA. It reached its top at a later premalignant period and gradually decreased after that. 3. There was negative correlation between the degree the telomere length was shortened and the activity of telomerase (r = -0.9654), and there was positive correlation between the reduced rate of telomere length and the activity of telomerase (r = 0.9471).

CONCLUSION

The activity of telomerase is one of important factors that can effect the stability of telomere length and plays a crucial role in the progression of oral cancer. So the activity of telomerase is an early molecular marker of carcinogenesis.

[A study on the association of telomere length with the experimental carcinogenesis of oral cavity]

OBJECTIVE

The life cycle of cell can be effected by the length of telomere. Loss of telomeric DNA during cell proliferation may play a role in chromosome instability, cellular apoptosis and cancer. The purpose of the study is to measure the dynamic changes of telomere length in experimental oral cavity cancer during golden hamster cheek pouch carcinogenesis induced by DMBA.

METHODS

First, 52 golden hamsters were divided into 2 groups. Four of them were not done any treatment and were killed after 3 days. The others were covered with DMBA on the surface of cheek pouch on one side in order to induce carcinogenesis, the other side of cheek pouch was treated as the control. Then, the 48 golden hamsters were divided into 4 groups and were killed in 7, 10, 14, 20 weeks. Light microscope was used to observe the pathologic changes. Southern hybridization was used to analysis the dynamic development of the length of telomeric repeat. In different periods, the reduction rate of telomere length was calculated.

RESULTS

1. The cheek pouch mucosa uncovered with DMBA had no abnormal pathologic changes, while that covered with DMBA was observed pathologic changes of different degrees. 4 cases of hyperplasia lesions and 8 cases of dysplasia lesions were observed in the 7-week group, 7 cases of dysplasia lesions and 5 cases of mucosa carcinoma in situ in the 10-week group, 5 cases of mucosa carcinoma in situ, 4 cases of squamous cell carcinomas and 3 cases of death in the 14-week group, and 7 cases of squamous cell carcinomas and 5 cases of death in the 20-week group. 2. The telomere length of the normal mucosa was reduced with the hamsters age increasing, but the telomere length was significantly shorter than that of the normal control during the mucosa carcinogenesis of cheek pouch. The average shortened length was about 0.225 kb (the normal mucosa was 0.17 kb). 3. The highest reduction rate (0.3985) was in a later premalignant period.

CONCLUSION

Age is one of the factors that can short telomere length. However, the speed that telomere length is shorted is faster than ever while telomere is abnormal. There is an obvious relationship between the abnormal degree of telomere length and the malignant degree of carcinoma. So the abnormal shorting of telomere length is an early molecular evidence of the oral carcinogenesis.

[A study on relationship between plasma heat stress protein 70 and cytokine in patients with heat apoplexy]

OBJECTIVE

To study the change of levels of plasma heat stress protein 70 (HSP70) and cytokine and their interrelationship in pathogenicity of heat apoplexy.

METHODS

Plasma HSP70 was determined with Western blot, and plasma interleukin-2 (IL-2), soluble interleukin-2 receptor (sIL-2R) and interleukin-6 (IL-6) were determined with enzyme-linked immunosorbent assay (ELISA).

RESULTS

Plasma level of HSP70 was 4 211.2 +/- 1,286.2 (integral optical density) in average in the patients of heat apoplexy group, 4,137.8 +/- 1, 207.5 in those of severe heat apoplexy group, and 6,043.5 +/- 1,354.8 in control group, with very significant difference (P < 0.01). Plasma IL-2 level was (64.3 +/- 32.3) pg/ml and (200.0 +/- 50.0) pg/ml and sIL-2R (54.9 +/- 33.3) U/ml and (167.5 +/- 89.0) U/ml in the patients with heat apoplexy and in controls, respectively, with very significant difference. But, there was no significant difference in IL-6 between varied groups.

CONCLUSIONS

The above-mentioned results suggest that establishment of heat acclimatization correlates to the interaction of network of neuroendocrine-cytokine-HSP, in which decrease in plasma IL-2 was one of the important factors causing reduction of HSP70 expression. Balance of network regulation was broken by pathological factors, finally resulting in heat apoplexy.

Expression of p53 and p21 protein in transitional mucosa adjacent to rectal carcinoma and its clinical implication

To study the biopathological characteristics of the transitional mucosa adjacent to rectal carcinoma, 34 cases were subjected to mucin histochemical and immunohistochemical study to observe the expression of p53 and p21 protein in distal mucosa adjacent to rectal carcinoma and its relationship to the mucin change. The expression of p53 protein was found in 29.4% (10/34) of distal transitional mucosa in the cytoplasm of goblet cells, and its positive staining was within 4 cm from carcinoma margin. All p53 positive mucosa was transitional mucosa. Overexpression of p21 protein was found in 26.5% (9/34) of distal transitional mucosa in cytoplasm of crypt cells, and its positive staining was within 2 cm from carcinoma margin. There was no relationship between the expression of p53 and p21 protein in carcinoma and that in transitional mucosa (P > 0.05). These findings indicated that there was aberrant alteration of p53 and p21 genes in transitional mucosa adjacent to colorectal carcinoma, which provided further evidence that transitional mucosa was an unstable pre-cancerous change. The aberrant mucin change and genetic alteration in distal mucosa of rectal cancer is within 4 cm.

[Neural network approach to medical grading of rheumatoid arthritis]

A grading system based on neural network has been developed and used int he medical grading diagnosis of a case group of Rheumatoid Arthritis presenting Cold syndrome intermingled with Heat syndrome. The possibility of using neural network in TCM diagnosis is preliminarily explored in this paper.

Neuronal activity-dependent cell survival mediated by transcription factor MEF2

During mammalian development, electrical activity promotes the calcium-dependent survival of neurons that have made appropriate synaptic connections. However, the mechanisms by which calcium mediates neuronal survival during development are not well characterized. A transcription-dependent mechanism was identified by which calcium influx into neurons promoted cell survival. The transcription factor MEF2 was selectively expressed in newly generated postmitotic neurons and was required for the survival of these neurons. Calcium influx into cerebellar granule neurons led to activation of p38 mitogen-activated protein kinase-dependent phosphorylation and activation of MEF2. Once activated, MEF2 regulated neuronal survival by stimulating MEF2-dependent gene transcription. These findings demonstrate that MEF2 is a calcium-regulated transcription factor and define a function for MEF2 during nervous system development that is distinct from previously well-characterized functions of MEF2 during muscle differentiation.

Calcineurin enhances MEF2 DNA binding activity in calcium-dependent survival of cerebellar granule neurons

Myocyte enhancer factor 2 (MEF2) has been shown recently to be necessary for mediating activity-dependent neuronal survival. In this study, we show that calcium signals regulate MEF2 activity through a serine/threonine phosphatase calcineurin. In cultured primary cerebellar granule neurons, the electrophoretic mobility of MEF2A protein was sensitive to the level of extracellular potassium chloride (KCl) and depolarizing concentrations of KCl led to hypophosphorylation of the protein. The specific inhibitors of calcineurin cyclosporin A (CsA) and FK506 could overcome KCl-dependent MEF2A hypophosphorylation. The effects of CsA and FK506 were KCl specific as they had little effect on MEF2A phosphorylation when granule neurons were cultured in the presence of full media. Hyperphosphorylation of MEF2A led to the loss of its DNA binding activity as determined by DNA mobility shift assay. Consistent with this, CsA/FK506 also inhibited MEF2-dependent reporter gene expression. These findings demonstrate that regulation of MEF2A by calcium signals requires the action of protein phosphatase calcineurin. By maintaining MEF2A in a hypophosphorylated state, calcineurin enhances the DNA binding activity of MEF2A and therefore maximizes its transactivation capability. The identification of MEF2 as a novel target of calcineurin may provide in part a biochemical explanation for the therapeutic and toxic effects of immunosuppressants CsA and FK506.

[Determination of Pb, Cu and Sn in ancient bronze coins using X-ray fluorescence theoretical alpha coefficient method]

In this paper, the theoretical alpha coefficients of L-T equation were applied to the analysis of Pb, Cu and Sn in ancient bronze coins by X-ray fluorescence spectrometry. The results obtained in this way are in agreement with those by the fundamental parameter method and the simulant standard samples method, because this method and the simulant standard samples method were both developed from the fundamental parameter method, and the standard samples are the same. The calculation of element concentration is simple and rapid, but the precision of the results depends relatively largely on the concentration range of the standard samples by this method.

[Effect of hypertonic saline/dextran 70 on delayed resuscitation of dogs with burn shock]

OBJECTIVE

To investigate the effect of hypertonic saline/dextran 70 on delayed resuscitation of burn shock.

METHODS

Eighteen mongrel dogs with 35% TBSA, third-degree burn were used in this study. Lactated Ringer's (LR) or 7.5% NaCl+ 6% dextran 70 (HSD) was given for resuscitation 6 h postburn. The volumes and rates of fluid infusion were controlled basically on the urinary output of 1.0 ml.kg-1.h-1 and cardiac output (CO) of 70%-80% of preburn values. The volume load, +dp/dtmax, -dp/dtmax, CI,DO2 and VO2 were obtained to evaluate the effect of HSD resuscitation.

RESULTS

The resuscitated volume of HSD was 30.56% less during first 24 h postburn and 59.50% less at 4 h after resuscitation than LR's. The +dp/dtmax, CI,DO2 and VO2 were increased significantly with HSD infusion at 2 h, 1 h and 0.5 h after resuscitation compared with LR's.

CONCLUSION

HSD could expand plasma volume significantly with small quantity. The cardiac contractility was enhanced and the oxygen delivery, oxygen consumption were increased in delayed resuscitation of burn shock.

[Clinical study of advanced nasopharyngeal carcinoma treated with radiotherapy combined with DDP and vindesine]

OBJECTIVE

To evaluate the result of radiotherapy combined with chemotherapy for advanced nasopharyngeal carcinoma (NPC).

METHODS

From August 1996 to October 1997, 64 cases of advanced NPC (stage N2-N3) patients were randomized to receive radiotherapy (RT) alone or RT combined with 2 cycles of chemeotherapy (CT) (cisplatin, vindesine). Thirty two patients were assigned to CT + RT, and 32 to RT alone.

RESULTS

At 40 Gy of RT the response rate was 28.1% in RT group and 43.8% in CT + RT group. The response rate at 3 months after RT was 75.0% in RT group and 84.4% in CT + RT group (P < 0.05). The major toxic effects were gastrointestinal reaction, myelosuppession and alopecia.

CONCLUSION

Chemotherapy with cisplatin and vindesine before and after radiotherapy increases the response rate of advanced NPC with lymph node metastases.

[Determination of Y, Ce, Ba and Cu in Y(1-x) Ce(x),Ba(2)Cu(3)O(y), using x-ray fluorescence fundamental parameter method]

The determination of Y, Ce, Ba and Cu in a series of Y(1-x)Ce(x)Ba(2)Cu(3)O(y) samples has been performed using X-ray fluorescence fundamental parameter method. The composition is given in atomic percentage. The results agree well with those obtained by ICP. It is shown that this method is appropriate for the determination of compositions of the high temperature superconductors. In addition, the influence of oxygen on analytical elements has been discussed in this paper. The fraction of the matrix total mass absorption that is associated with oxygen for each analytical line can not be larger than 3.44%. The determined composition of the samples show different from their nominal composition,which may affect the properties of high temperature superconductor.

Cloning and functional characterization of the 5'-flanking region of human methionine adenosyltransferase 2A gene

Methionine adenosyltransferase (MAT) is a critical cellular enzyme which catalyzes the formation of S-adenosylmethionine, the principal methyl donor. In mammals, two different genes, MAT1A and MAT2A, encode for liver-specific and non-liver-specific MAT, respectively. We have cloned and characterized a 1.4-kb 5'-flanking region of the human MAT2A (GenBank Accession No. AF039088). Two major transcriptional start sites were identified by primer extension and S1 nuclease protection analysis; one was within 10 nucleotides downstream and the other was located at 158 nucleotides upstream from the consensus TATA box, respectively. The promoter is highly GC rich (75%) in the first 300 base pairs and contains several Sp-1 binding sites, a C/EBP, a HSF2, a STATx, a c-Myb, several v-Myb, and numerous GATA consensus binding sites. The human MAT2A promoter was able to efficiently drive luciferase expression in both Jurkat and 293 cells, but sequential deletion analysis of the promoter revealed that different regions of the promoter are important for cell-specific MAT2A expression.

Changes in methionine adenosyltransferase during liver regeneration in the rat

Liver-specific and non-liver-specific methionine adenosyltransferase (MAT) are products of two genes (MAT1A and MAT2A, respectively) that catalyze the formation of S-adenosylmethionine (SAM), the principal methyl donor. We previously showed that MAT2A expression was associated with more rapid cell growth. Here we examined changes in hepatic MAT gene expression and related consequences after two-thirds partial hepatectomy (PH) in rats. The mRNA levels of both MAT forms increased from 3 to 6 h, but the MAT1A level then fell below baseline from 12 to 24 h, whereas the MAT2A level remained elevated up to 4 days after PH. The increase in the MAT2A mRNA level was due to increased gene transcription and mRNA stabilization. The change in the MAT1A mRNA level was posttranscriptional and did not require de novo protein synthesis. Changes in MAT activity were consistent with an increased amount of MAT isozymes. SAM levels, the ratio of SAM to S-adenosylhomocysteine (SAH), and DNA methylation fell from 6 to 24 h, whereas SAH levels increased slightly at 12 and 24 h after PH. Both increased SAM utilization and MAT2A gene expression likely contributed to the fall in SAM.

[Inhibition effects of tumor infiltrating lymphocytes from oral cancer on nude mice transplanted tumor established with human tongue carcinoma cell lines]

OBJECTIVE

To observe the in vivo inhibition effects on nude mice transplanted tumor with tumor infiltrating lymphocytes (TILs) isolated from primary mass of oral cancer.

METHODS

Established the transplanted tumor model of human tongue cancer at the back of BALB/C nude mice with subcutaneous injection of squamous cell carcinoma lines Tca 8113. TILs isolated from patients with Oral cancer, combining with low dose of cyclophosphamide (Cy: 50 mg/kg), were locally injected into the peripheral site of tumor. The inhibition rate (IR) was calculated by the volume of tumor mass from the 1st to the 8th week, and the weights at the 8th week after tumor dissection.

RESULTS

1. Group TIL + rIL-2 and group TIL + rIL-2 + Cy both exerted a strong inhibition effect on the transplanted tumor within three weeks. The Inhibition rate (IR) were 86.1% +/- 0.4% and 97.7% +/- 0.6% respectively at the 3rd week, while 32.1% +/- 0.3% and 80.6% +/- 0.3% at the 8th week. 2. TIL + rIL-2 + Cy expressed a stronger effect and a longer inhibition time. The IR of TIL + rIL-2 and TIL + rIL-2 + Cy were 20.0% +/- 1.4% and 75.5% +/- 2.5% respeetively at the 8th week (P < 0.01).

CONCLUSION

This study demonstrated that TILs from patients with oral carcer possess strong in vivo inhibition on nude mice transplanted tumor, and low dose of cyclophasophamide can enhance the inhibition effect and prolong the inhibition time.

Protection of leukemic cells by deoxycytidine: in vitro measures of protection against cytosine arabinoside

Plasma deoxycytidine levels can be very high in leukemia patients. Such levels strongly protected leukemia cell lines against cytosine arabinoside (araC), fludarabine and 2-chlorodeoxyadenosine when using clonogenic survival as the endpoint. This endpoint is not easily used when studying protection in clinical leukemia cell samples. Therefore, we tested other ways to quantify protection based on biochemical measures of viability or drug metabolism. The estimates of the strength of protection based on rates of DNA synthesis, cellular araC uptake and incorporation of araC into DNA were much lower than the estimates using clonogenic survival. The MTT viability assay gave excellent estimates and appears promising for studying protection in primary leukemia cell samples.

Differential expression of methionine adenosyltransferase genes influences the rate of growth of human hepatocellular carcinoma cells

Methionine adenosyltransferase (MAT) catalyzes the formation of S-adenosylmethionine (SAM), the principal methyl donor, and is essential to normal cell function. The two forms of MAT, liver specific and non-liver specific, are products of two genes, MAT1A and MAT2A, respectively. We have reported a switch from MAT1A to MAT2A gene expression in human liver cancer cells. In the current work, we examined whether the type of MAT expressed by the cell influences cell growth. HuH-7 cells were stably transfected with MAT1A and were subsequently treated with antisense oligonucleotides directed against MAT2A. MAT2A antisense treatment reduced the amount of MAT2A mRNA by 99% but had no effect on MAT1A mRNA. Cell growth and DNA synthesis rates were reduced by approximately 20-25% after transfection with MAT1A and by an additional 30-40% after MAT2A antisense treatment. SAM level and SAM:S-adenosylhomocysteine (SAH) ratio increased by 50-75% after MAT1A transfection and by an additional 60-80% after MAT2A antisense treatment. DNA methylation changed in parallel to changes in SAM level and SAM:SAH ratio. Supplementing untransfected HuH-7 cells with SAM in the culture medium increased SAM level, SAM:SAH ratio, and DNA methylation and decreased cell growth and DNA synthesis. In conclusion, cell growth is influenced by the type of MAT expressed. The mechanism likely involves changes in SAM:SAH ratio and DNA methylation.

[Histologic study for effects of ox collagen in forming of new bone with quantitative method in animal models]

In this study, collagen was implanted into mandibular defects of 10 dogs. After operations, the samples were examined with microscope and quantitative method at 10 periods. Results showed that collagen did not affect bone growth and new bone grew into collagen directly. There was no fibrous capsule between collagen and new bone. Eventually, majority of collagen was resorbed and replaced by bone tissue. It was concluded that collagen has a good histocompatibility.

[Cellular compatibility study of ox collagen with fibroblast cells]

The cell culture method was used to evaluate the cytotoxicity of ox collagen for clinical use. Direct method was chosen to examine the shape and growth of cells. Results showed that the cell shape was normal and the growth was well. The cytotoxicity of ox collagen conformed to the standards made by International Organization for Standardization (ISO). This study demonstrated that ox collagen doesn't restrain the growth of cells and has good biocompatibility.

Rice dwarf phytoreovirus segment S11 encodes a nucleic acid binding protein

The function of rice dwarf virus segment 11 and the corresponding segments of other phytoreoviruses is not yet determined. The amino acid sequence of Pns11, encoded by segment 11, contains a putative zinc finger and five flanking basic regions at the C-terminus. The full-length Pns11 protein and three truncated derivatives, which lack the N-terminus, the zinc-finger or the C-terminal five basic regions were expressed in Escherichia coli and their nucleic acid binding properties were studied. Pns11 interacts with single- and double-stranded forms of DNA and RNA in a sequence-nonspecific manner. The truncated derivative which contains both the zinc-finger and the C-terminal basic regions has the same binding properties as the full-length Pns11. However, removal of either of these domains prevents binding activity. The binding activity of Pns11 was drastically reduced when the blots were treated with a high concentration of EDTA. Moreover, Pns11 extracted from infected rice also binds to single-stranded RNA. These data suggest that RDV Pns11 binding activity is structure-dependent and it may play an important role in virus replication and/or genome assortment.

Tuftelin--aspects of protein and gene structure

The acidic enamel protein tuftelin has now been cDNA cloned, sequenced and characterized in a number of vertebrate species. Recently, the bovine tuftelin gene structure was elucidated. Cloning of the human tuftelin gene and partial sequencing of a number of exons have also been achieved. Immunologically, the protein has been shown to be conserved throughout 550 million years of vertebrate evolution. The gene has been localized to the long arm of the autosomal chromosome 1. The mapping of the human tuftelin gene to a well-defined cytogenetic region could be important in understanding the etiology of autosomally inherited amelogenesis imperfecta, the most common hereditary disease of enamel. The present paper reviews the primary structure, mRNA/cDNA structure, and gene structure of tuftelin. It describes its immunolocalization at the light microscope level and at the ultrastructural level in both the ameloblast cells and in the extracellular enamel matrix. The timing of tuftelin expression and its possible roles in enamel formation are discussed.

[Determination of Cu, Pb, Sn, Fe and Zn in the ancient Chinese bronzes by X-ray fluorescence filter paper method]

The determination of Cu, Pb, Sn, Fe and Zn in the ancient chinese bronzes has been performed using X-ray fluorescence filter paper method. The result is satisfactory. The samples are dissolved in the HCl-H2O2 system, ard then the solution is dropped on the filter paper. It is convenient for detection by XRF. In addition this method is efficient to reduce the matrix effect of sample. The correlative coefficients of calibration curves between element concentration and X-ray intensity are over 0.99. The rate of recovery is 97-104%, and the relative standard deviation for each element is less than 2.00%. The copper's result measured by this method agrees well with that of chemical method. This method is simple, rapid and accurate. It is also applied to determine the elements in the other ancient objects.

Induction of c-fos/c-myc expression by epidermal growth factor decreases with alteration of their gene binding proteins in senescent fibroblasts

OBJECTIVE

To observe the changes of proto-oncogene c-fos/c-myc expression and its relation to specific transcription factors in human senescent fibroblast after epidermal growth factor (EGF) addition.

METHODS

The c-fos/c-myc expression were analysed by Northern blot. Transcription factors were analysed by Southwestern blot.

RESULTS

(1) The expression of c-fos/c-myc was less susceptible to induction by EGF as the cells aged. (2) EGF increased the binding of protein P91 to c-fos with regulatory sequence and P80 to c-myc with regulatory sequence, but the increased levels of both proteins were significantly reduced in senescent cells.

CONCLUSIONS

Inability of c-fos/c-myc gene induction by EGF in senescent cells might be correlated with some DNA-binding proteins.

[Histopathologic and immunochemical changes in Sjögren's syndrome]

To research into the causes of sjögren's syndrome, we investigated the lacrimal gland tissues of 6 cases of sjogren's syndriome by using electronmicroscopy and immunochemical methods. The results revealed that at the early stage the lacrimal gland cells showed degeneration, irregular arrangement and many intracellular vacuoles. At the middle stage, some lymphocytes infliltrated into the gland tissues. And at the advanced stage, lymphocytes and collagenous fibers were there in substitution of gland cells.

[Dynamic distribution in vivo of TIL from human tongue cancer after local injection in animal model]

On the basis of established nude mice transplanted tumor model of human tongue squamous cell carcinoma, peritumor injection was performed with 3H-TdR labeled TIL from human tongue cancer after 4 weeks culture. The dynamic distribution of 3H-TIL in vivo was learned through detecting the radioactivity of the target tissues. The results demonstrated that 3H-TIL was found in the whole body. There were about 2.1-30 times more in tumor tissues than in normal tissues and 3H-TILs even collected in the tumor tissues distal to the injective sites. The nearer to the injective sites the tumor tissues, the more 3H-TIL collected. It showed that local injection of TIL could be expected to exert a better antitumor effect.