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1.  Growth Factor Measurement and Histological Analysis in Platelet Rich Fibrin: A Pilot Study 
Objective
The aim of this study was to compare growth factor amount contained in platelet rich fibrin (PRF) and compare with that in platelet rich plasma (PRP), and in whole blood. And also to investigate distribution of growth factors and cellular components in PRF.
Materials and Methods
PRF and PRP were obtained from the same sample of peripheral blood. Extraction of proteins were done with lysis buffer, accompanied by freeze and thaw procedures. Concentration of two representative growth factors in platelets: platelet derived growth factor (PDGF) and transforming growth factor beta (TGF-β), were measured with enzyme-linked immunosorbent assay (ELISA). PRF was cut into three parts: (top, middle and bottom), and growth factor concentration was measured respectively. Paraffin embedded section of PRF was observed with Giemsa stain. Immuno-histochemical analysis with anti-PDGF and anti-TGF-β antibodies was also conducted.
Results
The growth factor levels in PRF was higher than in peripheral blood and comparable to those in PRP. Growth factor levels in bottom part of PRF was much higher than in top and middle part. Microscopically, platelets and mono-nucleated cells were concentrated just above the yellow–red interface. Poly-nucleated cells were concentrated below the interface.
Conclusion
The growth factors were surely concentrated in PRF. This result can support basis of good clinical outcomes. For effective application of PRF, the knowledge that growth factors and cells are not equally distributed in PRF should be utilized.
doi:10.1007/s12663-015-0768-3
PMCID: PMC4648775  PMID: 26604462
Platelet rich fibrin; Growth factor; Mono-nucleated cells; ELISA; Immuno-histochemistry
2.  Clinical and histopathological effects of presurgical treatment with sunitinib for renal cell carcinoma with inferior vena cava tumor thrombus at a single institution 
Anti-Cancer Drugs  2016;27(10):1038-1043.
To evaluate the clinical and histopathological effects of presurgical treatment with sunitinib on inferior vena cava (IVC) tumor thrombus. Between 2010 and 2014, we treated seven patients with renal cell carcinoma and IVC tumor thrombus presurgically with sunitinib. We retrospectively evaluated primitive tumor size, the level of tumor thrombus according to Novick’s classification, its distance above the renal vein, thrombus diameter at its widest segment, and histopathological change after sunitinib treatment. Three patients were diagnosed histologically. Percutaneous biopsy of the renal mass before sunitinib treatment was performed in two patients. One patient was diagnosed after sunitinib treatment following nephrectomy. The primitive tumors shrank upon sunitinib therapy in four cases; however, although the caval thrombus was downstaged (from level II to I) in one patient, the level of caval thrombus did not change in five patients and increased in one patient (from level III to IV). We evaluated the histopathological effects in two patients. In one patient, the IVC tumor thrombus was mostly replaced with necrotic tissue, but its thrombus level was not downstaged. In the other patient, the IVC tumor thrombus was downstaged, but tumor thrombus was not replaced with necrotic tissue and viable tumor cells remained. Presurgical treatment with sunitinib for renal cell carcinoma with IVC tumor thrombus appears to have limited effect on IVC tumor thrombus, in contrast to its effects on primitive tumor shrinkage. In the absence of evidence of presurgical benefits from prospective studies, this treatment may not be systematically advisable.
doi:10.1097/CAD.0000000000000422
PMCID: PMC5049971  PMID: 27557138
inferior vena cava thrombus; molecular-targeted therapy; presurgical treatment; renal cell carcinoma; sunitinib
3.  An augmented reality system in lymphatico-venous anastomosis surgery†  
Journal of Surgical Case Reports  2016;2016(5):rjw047.
Indocyanine green lymphography, displayed as infrared image, is very useful in identifying lymphatic vessels during surgeries. Surgeons refer the infrared image on the displays as they proceed the operation. Those displays are usually placed on the walls or besides the operation tables. The surgeons cannot watch the infrared image and the operation field simultaneously. They have to move their heads and visual lines. An augmented reality system was developed for simultaneous referring of the infrared image, overlaid on real operation field view. A surgeon wore a see-through eye-glasses type display during lymphatico-venous anastomosis surgery. Infrared image was transferred wirelessly to the display. The surgeon was able to recognize fluorescently shining lymphatic vessels projected on the glasses and dissect them out.
doi:10.1093/jscr/rjw047
PMCID: PMC4915215  PMID: 27154749
4.  Monocyte Chemotactic Protein-1 (MCP-1/CCL2) Is Associated With Prostatic Growth Dysregulation and Benign Prostatic Hyperplasia 
The Prostate  2010;70(5):473-481.
BACKGROUND
Chronic inflammation is commonly observed in benign prostate hyperplasia (BPH), and prostate tissue often contains increased inflammatory infiltrates, including T cells and macrophages. Cytokines are not only key mediators of inflammation but may also play important roles in the initiation and progression of BPH.
METHODS
In order to determine what cytokines might be involved in prostatic enlargement, expressed prostatic secretions (EPS) from ex vivo prostates were analyzed by human cytokine antibody microarray and ELISA. Prostate epithelial cells (PrEC) and prostate stromal cells (PrSC) were used for ELISA, proliferation, and Western blot assays.
RESULTS
Monocyte chemotactic protein-1 (MCP-1/CCL2) was one of the most elevated proteins in secretions from large prostate glands. PrSC were found to secrete MCP-1; Western blotting showed that both PrSC and PrEC express the MCP-1 receptor CCR2 which by RT-PCR was the CCR2b isoform. Proliferation assays showed that MCP-1 stimulates the proliferation of PrEC, but not PrSC, and that a specific MCP-1 antagonist (RS102895) suppressed this effect. Conditioned medium from PrSC stimulated the proliferation of PrEC as well, an effect completely inhibited by both RS102895 and a neutralizing anti-MCP-1 monoclonal antibody. The inflammatory cytokines interleukin (IL)-1β, interferon-γ, and IL-2 enhanced the secretion of MCP-1 from PrEC and PrSC. In addition, MCP-1 levels in EPS correlated with mRNA levels of the macrophage marker CD68 in the same secretions.
CONCLUSIONS
The cytokine MCP-1, of apparent prostatic stromal cell origin, may play an important role in prostatic enlargement and BPH, and is a candidate biomarker for these pathologic processes.
doi:10.1002/pros.21081
PMCID: PMC4789093  PMID: 19902472
BPH; MCP-1; CCL2; PrEC; PrSC
5.  Metastatic testicular cancer presenting with liver and kidney dysfunction treated with modified BEP chemotherapy combined with continuous hemodiafiltration and rasburicase 
Anti-Cancer Drugs  2016;27(4):364-368.
A 25-year-old man was admitted to our hospital complaining of right scrotal pain and upper abdominal pain. A computed tomographic scan indicated a right scrotal mass, a huge liver mass, and multiple lung masses, although there was no enlarged retroperitoneal lymph node swelling. Laboratory tests showed severe liver and kidney dysfunction and high levels of serum α-fetoprotein (11 997 ng/ml). Although needle biopsies of the testicular and liver masses were performed, the tissues were insufficient for a pathological diagnosis. As liver and kidney function worsened, we started chemotherapy with bleomycin, etoposide, and cisplatin (BEP chemotherapy), which was modified because of the liver and renal dysfunction. We also used continuous hemodiafiltration and rasburicase to prevent tumor lysis syndrome. After induction of chemotherapy, the liver and kidney dysfunction improved immediately and the high orchiectomy was performed on day 8 after chemotherapy. The pathological diagnosis was a yolk sac tumor. He underwent four courses of the BEP regimen and five courses of the TIN regimen (paclitaxel, ifosphamide, and nedaplatin), followed by the resection of liver metastases. There was no evidence of viable cells in the resected liver and no recurrence was evident at 1 year postoperatively.
doi:10.1097/CAD.0000000000000334
PMCID: PMC4777219  PMID: 26736135
continuous hemodiafiltration; liver metastasis; rasburicase; testicular cancer
6.  The miR-130 family promotes cell migration and invasion in bladder cancer through FAK and Akt phosphorylation by regulating PTEN 
Scientific Reports  2016;6:20574.
Bladder cancer causes an estimated 150,000 deaths per year worldwide. Although 15% of the recurrent bladder cancer becomes an invasive type, currently used targeted therapy for malignant bladder cancer is still not efficient. We focused on the miR-130 family (miR-130b, miR-301a, and miR-301b) that was significantly upregulated in bladder cancer specimens than that of the normal urothelial specimens. We analyzed the functional significance of miR-130 family using a 5637 bladder cancer cell line and revealed that miR-130 family of inhibitors suppressed cell migration and invasion by downregulating focal adhesion kinase (FAK) and Akt phosphorylation. Mechanistic analyses indicate that the miR-130 family directly targets phosphatase and tensin homolog deleted from chromosome 10 (PTEN), resulting in the upregulation of FAK and Akt phosphorylation. In clinical bladder cancer specimens, downregulation of PTEN was found to be closely correlated with miR-130 family expression levels. Overall, the miR-130 family has a crucial role in malignant progression of bladder cancer and thus the miR-130 family could be a promising therapeutic target for invasive bladder cancer.
doi:10.1038/srep20574
PMCID: PMC4738343  PMID: 26837847
7.  Expression of miR-27a-3p is an independent predictive factor for recurrence in clear cell renal cell carcinoma 
Oncotarget  2015;6(25):21645-21654.
MicroRNAs (miRNAs) are noncoding RNAs that regulate gene expression and function in tumor development and progression. We previously identified up-regulated miRNAs in clear cell renal cell carcinoma (ccRCC) compared to matched-pair normal kidney by microarray. Here, we identify miRNAs that are up-regulated in ccRCC and are also correlated with survival and/or recurrence. Twenty-four samples from ccRCC patients who underwent nephrectomies between 2011 and 2012 were divided into two groups: one of eleven patients who experienced recurrence (Group 1), and one of thirteen patients with no evidence of disease (Group 2) 2 years after surgery. Analyzing 22 miRNAs that were up-regulated in ccRCC in our previous study, we identify five miRNAs that were statistically up-regulated in Group 1 versus Group 2 by quantitative real-time PCR. We then evaluated these miRNAs in an independent cohort of 159 frozen ccRCC samples. High levels of miR-27a-3p (p < 0.01) correlated with a worse progression-free survival rate. Multivariate analysis revealed that miR-27a-3p was an independent predictive factor for recurrence. For functional analysis, miR-27a-3p controlled cell proliferation, migration and invasion in RCC cell lines. MiR-27a-3p could act as oncogenic miRNA and may be a candidate for targeted molecular therapy in ccRCC.
PMCID: PMC4673293  PMID: 26046464
clear cell carcinoma; renal cell carcinoma; microRNA; prognosis; recurrence
9.  Hypertrophic scar contracture is mediated by the TRPC3 mechanical force transducer via NFkB activation 
Scientific Reports  2015;5:11620.
Wound healing process is a complex and highly orchestrated process that ultimately results in the formation of scar tissue. Hypertrophic scar contracture is considered to be a pathologic and exaggerated wound healing response that is known to be triggered by repetitive mechanical forces. We now show that Transient Receptor Potential (TRP) C3 regulates the expression of fibronectin, a key regulatory molecule involved in the wound healing process, in response to mechanical strain via the NFkB pathway. TRPC3 is highly expressed in human hypertrophic scar tissue and mechanical stimuli are known to upregulate TRPC3 expression in human skin fibroblasts in vitro. TRPC3 overexpressing fibroblasts subjected to repetitive stretching forces showed robust expression levels of fibronectin. Furthermore, mechanical stretching of TRPC3 overexpressing fibroblasts induced the activation of nuclear factor-kappa B (NFκB), a regulator fibronectin expression, which was able to be attenuated by pharmacologic blockade of either TRPC3 or NFκB. Finally, transplantation of TRPC3 overexpressing fibroblasts into mice promoted wound contraction and increased fibronectin levels in vivo. These observations demonstrate that mechanical stretching drives fibronectin expression via the TRPC3-NFkB axis, leading to intractable wound contracture. This model explains how mechanical strain on cutaneous wounds might contribute to pathologic scarring.
doi:10.1038/srep11620
PMCID: PMC4479825  PMID: 26108359
11.  EMMPRIN Promotes Angiogenesis, Proliferation, Invasion and Resistance to Sunitinib in Renal Cell Carcinoma, and Its Level Predicts Patient Outcome 
PLoS ONE  2013;8(9):e74313.
Purpose
Extracellular matrix metalloproteinase inducer (EMMPRIN) has been reported to play crucial roles, including in angiogenesis, in several carcinomas. However, the correlation between EMMPRIN levels and angiogenesis expression profile has not been reported, and the role of EMMPRIN in renal cell carcinoma (RCC) is unclear. In the present study, we evaluated the association of EMMPRIN with angiogenesis, its value in prognosis, and its roles in RCC.
Experimental Design
EMMPRIN expression was examined in 50 RCC patients treated with radical nephrectomy. Angiogenesis, proliferation, and invasion activity were evaluated using EMMPRIN knockdown RCC cell lines. The size of EMMPRIN-overexpressing xenografts was measured and the degree of angiogenesis was quantified. EMMPRIN expression was evaluated in RCC patients who received sunitinib therapy and in sunitinib-resistant cells. Further, the relation between EMMPRIN expression and sensitivity to sunitinib was examined.
Results
EMMPRIN score was significantly associated with clinicopathological parameters in RCC patients, as well as being significantly correlated with microvessel area (MVA) in immature vessels and with prognosis. Down-regulation of EMMPRIN by siRNA led to decreased VEGF and bFGF expression, cell proliferation, and invasive potential. EMMPRIN over-expressing xenografts showed accelerated growth and MVA of immature vessels. EMMPRIN expression was significantly increased in patients who received sunitinib therapy as well as in sunitinib-resistant 786-O cells (786-suni). EMMPRIN-overexpressing RCC cells were resistant to sunitinib.
Conclusion
Our findings indicate that high expression of EMMPRIN in RCC plays important roles in tumor progression and sunitinib resistance. Therefore, EMMPRIN could be a novel target for the treatment of RCC.
doi:10.1371/journal.pone.0074313
PMCID: PMC3779201  PMID: 24073208
12.  Immunomodulatory IL-18 binding protein is produced by prostate cancer cells and its levels in urine and serum correlate with tumor status 
Cytokines may play a role in the initiation and progression of prostate cancer. A cytokine antibody array was previously applied to prostatic fluid obtained from patients with prostate cancer, and interleukin 18 binding protein (IL-18BP), a potent inhibitor of interleukin 18, was noted to be significantly upregulated in cases with large volume disease. We sought to further characterize the association of IL-18BP with prostate cancer and determine whether IL-18BP levels in patient serum and urine samples had clinical relevance. IL-18BP was expressed and secreted by the prostate cancer cell lines DU145 and PC3, but not by LNCaP and CWR22, upon interferon-γ (IFN-γ) stimulation. IFN-γ-induced secretion of IL-18BP was enhanced by added TNF-α, IFN-α and IFN-β. The IL-18BP secreted from DU145 and PC3 functionally inhibited IL-18. Immunohistochemical analyses showed positive IL-18BP staining in prostate cancer cells as well as in macrophages in radical prostatectomy specimens. Significant differences in urinary IL-18BP levels (normalized by total protein) collected post-DRE were found between cases with and without cancer on biopsy (P = 0.02) and serum IL-18BP levels correlated with Gleason score (P = 0.03). Our finding of elevated IL-18BP secretion from prostate cancer cells suggests an attempt by cancer to escape immune surveillance. IL-18BP merits further study as a marker of aggressive prostate cancer and as a therapeutic target.
doi:10.1002/ijc.25705
PMCID: PMC3040782  PMID: 20878981
Prostate cancer; IL-18 binding protein; urinary marker
13.  Clinical characteristics and risk factors for septic shock in patients receiving emergency drainage for acute pyelonephritis with upper urinary tract calculi 
BMC Urology  2012;12:4.
Background
Acute pyelonephritis (APN) is a common complication of ureteral obstruction caused by urolithiasis, and it can be lethal if it progresses to septic shock. We investigated the clinical characteristics of patients undergoing emergency drainage and assessed risk factors for septic shock.
Methods
A retrospective study was performed of 98 patients (101 events) requiring emergency drainage at our urology department for obstructive APN associated with upper urinary tract calculi from January 2003 to January 2011. Clinical characteristics were summarized, and risk factors for septic shock were assessed by logistic regression analysis.
Results
Objective evidence of sepsis was found in 64 (63.4%) events, and 21 events (20.8%) were categorized as septic shock. Ninety-six patients recovered, but 2 patients died of septic shock. Multivariate analysis revealed that age and the presence of paralysis were independent risk factors for septic shock.
Conclusions
APN associated with upper urinary tract calculi is a severe disease that should be treated with caution, particularly when risk factors are present.
doi:10.1186/1471-2490-12-4
PMCID: PMC3353222  PMID: 22413829
14.  Supplementation of bone marrow aspirate-derived platelet-rich plasma for treating radiation-induced ulcer after cardiac fluoroscopic procedures: A preliminary report 
Background:
The frequency of encountering radiodermatitis caused by X-ray fluoroscopic procedures for ischaemic heart disease is increasing. In severe cases, devastating ulcers with pain, for which conservative therapy is ineffective, emerge. Radiation-induced ulcers are notorious for being difficult to treat. Simple skin grafting often fails because of the poor state of the wound bed. A vascularized flap is a very good option. However, the non-adherence of the well-vascularized flap with the irradiated wound bed is frequently experienced.
Aim:
To ameliorate the irradiated wound bed, bone marrow-derived platelet-rich plasma (bm-PRP) was delivered during the surgery.
Materials and Methods:
Four patients with severe cutaneous radiation injury accompanied by unbearable pain after multiple fluoroscopic procedures for ischaemic heart disease were treated. Wide excision of the lesion and coverage with a skin flap supplemented with bm-PRP injection was performed.
Results:
All patients obtained wound closure and were relieved from pain. No complication concerning the bone marrow aspiration and delivery of bm-PRP was observed.
Conclusions:
Supplementation of bm-PRP can be an option without major complications, time, and cost to improve the surgical outcome for irradiated wounds.
doi:10.4103/0970-0358.96599
PMCID: PMC3385373  PMID: 22754164
Bone marrow; cardiac fluoroscopy; platelet-rich plasma; radiation ulcer; skin flap
15.  The Escherichia coli K-12 ORFeome: a resource for comparative molecular microbiology 
BMC Genomics  2010;11:470.
Background
Systems biology and functional genomics require genome-wide datasets and resources. Complete sets of cloned open reading frames (ORFs) have been made for about a dozen bacterial species and allow researchers to express and study complete proteomes in a high-throughput fashion.
Results
We have constructed an open reading frame (ORFeome) collection of 3974 or 94% of the known Escherichia coli K-12 ORFs in Gateway® entry vector pENTR/Zeo. The collection has been used for protein expression and protein interaction studies. For example, we have compared interactions among YgjD, YjeE and YeaZ proteins in E. coli, Streptococcus pneumoniae, and Staphylococcus aureus. We also compare this ORFeome with other Gateway-compatible bacterial ORFeomes and show its utility for comparative functional genomics.
Conclusions
The E. coli ORFeome provides a useful resource for functional genomics and other areas of protein research in a highly flexible format. Our comparison with other ORFeomes makes comparative analyses straighforward and facilitates direct comparisons of many proteins across many genomes.
doi:10.1186/1471-2164-11-470
PMCID: PMC3091666  PMID: 20701780
16.  Specific detection of prostate cancer cells in urine by multiplex immunofluorescence cytology 
Human pathology  2009;40(7):924-933.
Summary
Prostate cancer biomarkers are enriched in urine after prostatic manipulation, suggesting whole cells might also be detectable for diagnosis. We tested multiplex staining of urinary sediments as a minimally-invasive method to detect prostate cancer. Urine samples were collected after prostatic massage (attentive digital rectal examination) from 35 men in Urology clinic, and without massage from 15 control men without urologic disease, for a total of 50 specimens (27 cancer positive cases, 23 cancer negative cases). LNCaP prostate cancer cells spiked into urine were used for initial marker optimization. Urine sediments were cytospun onto glass slides and stained. Multiplex urine cytology was compared to conventional urine cytology for cancer detection: anti-alpha-methylacyl CoA racemase (AMACR) antibody was used as a marker of prostate cancer cells, anti-Nkx3.1 as a marker of prostate epithelial cells, anti-nucleolin as a marker of nucleoli, and DAPI to highlight nuclei. Prostate cancer cells were successfully visualized by combined staining for AMACR, Nkx3.1, and nucleolin. Of 25 informative cases with biopsy-proven prostate cancer, 9 were diagnosed as suspicious or positive by multiplex immunofluorescence urine cytology, but only 4 were similarly judged by conventional cytology. All cases without cancer were read as negative by both methods. Multiplex cytology sensitivity for cancer detection in informative cases was 36% (9/25) and specificity was 100% (8/8). In conclusion, we have successfully achieved multiple-staining for AMACR, Nkx3.1, Nucleolin, and DAPI to detect prostate cancer cells in urine. Further refinements in marker selection and technique may increase sensitivity and applicability for prostate cancer diagnosis.
doi:10.1016/j.humpath.2009.01.004
PMCID: PMC2757169  PMID: 19368959
prostate cancer; urine cytology; biomarkers; diagnosis; multiplex staining
17.  Endoglin (CD105) as a Urinary and Serum Marker of Prostate Cancer 
We have previously shown that endoglin (CD105) is upregulated in prostatic fluid of men with large volume prostate cancer. We chose to assess endoglin levels in urine and serum from men with prostate cancer or at increased risk for the disease: Urine samples were collected after DRE from 99 men whose cancer status was confirmed by biopsy, and serum samples were collected from 20 men without prostate cancer at low risk for the disease, and from 69 men diagnosed with prostate cancer that subsequently underwent radical prostatectomy (30 pT2, 39 pT3). Endoglin levels were assessed by ELISA. Urinary endoglin was elevated in men with biopsy-positive prostate cancer compared to biopsy-negative men (p=0.0014). Urinary endoglin levels in men with prostate cancer correlated with radical prostatectomy tumor volume. The area under the receiver-operator characteristics (ROC) curve was 0.72 for urinary endoglin and 0.50 for serum prostate-specific antigen PSA (sensitivity for cancer detection 73%, specificity 63%). There were no differences in serum endoglin between normal and cancer cases, but there were increases in serum endoglin in non-organ confined (NOC, pT3+) vs. organ-confined (OC, pT2) cases (p=0.0004). The area under the ROC curve was 0.75 for serum endoglin and 0.63 for PSA for predicting NOC status, with a sensitivity of 67% and a specificity of 80%. In conclusion, elevations in post-DRE urinary endoglin suggest there may be value in further studying endoglin as a urinary biomarker of prostate cancer. Endoglin levels in both urine and serum may aid in prostate cancer detection and prognostication.
doi:10.1002/ijc.24007
PMCID: PMC2666305  PMID: 19004009
Endoglin; CD105; Prostate Cancer; Biological Markers; Clinical Markers
18.  Cytokine Profiling of Prostatic Fluid from Cancerous Prostate Glands 
The Prostate  2008;68(8):872-882.
BACKGROUND
Cytokines are key mediators of inflammation that may play important roles in prostate cancer initiation and progression. Cytokines found in cancerous prostates may provide further insight into the mechanisms of cancer initiation and progression, and facilitate the exploration of new markers of prostatic neoplasia and inflammation. We describe the cytokine profile of prostatic fluids obtained from cancerous prostate glands and correlate it to both cancer status and inflammation grade.
METHODS
Prostatic fluid was collected from fresh radical prostatectomy specimens and analyzed by human cytokine antibody microarray. Cases were selected from patients with either minimal or extensive cancer volume on final pathology. Among the cytokines with the greatest difference between the tumor volume groups, eight had their levels quantitated by ELISA and correlated with cancer status and grade of inflammation by neutrophils, macrophages and lymphocytes.
RESULTS
Among 174 cytokines analyzed, HGF was the most increased (6.57-fold), and HGF and IL18Bpa were significantly elevated in patients with extensive prostate cancer. IL17, GITR, ICAM-1, and IL-18Bpa were elevated in specimens with neutrophilic inflammation into gland lumina, and IL18Bpa, IL17, GITR, ICAM-1 were elevated in specimens with lymphocytic inflammation in prostatic stroma.
CONCLUSIONS
Prostatic fluid cytokines were identified that may be useful in early detection and prognostication efforts for prostate cancer, particularly if they can be found not only in prostatic fluids obtained ex vivo, but in expressed prostatic secretions or urine samples from patients with their prostates still in situ.
doi:10.1002/pros.20755
PMCID: PMC2562260  PMID: 18361406
cancer; inflammation; cytokine
19.  Transplantation of spermatogonial stem cells isolated from leukemic mice restores fertility without inducing leukemia 
Journal of Clinical Investigation  2005;115(7):1855-1861.
More than 70% of patients survive childhood leukemia, but chemotherapy and radiation therapy cause irreversible impairment of spermatogenesis. Although autotransplantation of germ cells holds promise for restoring fertility, contamination by leukemic cells may induce relapse. In this study, we isolated germ cells from leukemic mice by FACS sorting. The cell population in the high forward-scatter and low side-scatter regions of dissociated testicular cells from leukemic mice were analyzed by staining for MHC class I heavy chain (H-2Kb/H-2Db) and for CD45. Cells that did not stain positively for H-2Kb/H-2Db and CD45 were sorted as the germ cell–enriched fraction. The sorted germ cell–enriched fractions were transplanted into the testes of recipient mice exposed to alkylating agents. Transplanted germ cells colonized, and recipient mice survived. Normal progeny were produced by intracytoplasmic injection of sperm obtained from recipient testes. When unsorted germ cells from leukemic mice were transplanted into recipient testes, all recipient mice developed leukemia. The successful birth of offspring from recipient mice without transmission of leukemia to the recipients indicates the potential of autotransplantation of germ cells sorted by FACS to treat infertility secondary to anticancer treatment for childhood leukemia.
doi:10.1172/JCI24189
PMCID: PMC1150287  PMID: 15965502

Results 1-19 (19)