[Prospective evaluation of intrasphincteric injections of autologous muscular cells in patients with stress urinary incontinence following radical prostatectomy]. / Évaluation prospective du traitement de l'incontinence urinaire post-prostatectomie par injections intrasphinctériennes de cellules musculaires autologues.

PURPOSE: Cell therapy for urinary incontinence management has been experienced in animals with encouraging results, but studies in human beings are lacking. Our primary objective was to assess the safety of intrasphincteric injections of autologous muscular cells in patients with postprostatectomy incontinence (PPI). Secondary objectives focused on complications efficacy. METHODS: We conducted an open, prospective study in a single center on 12 patients presenting PPI. Patients underwent intrasphincteric injections of autologous muscular cells isolated from a biopsy of deltoid muscle. The primary endpoint was the Q(max) variation at the three month visit in order to assess potential bladder outlet obstruction. Secondary endpoints assessed side effects and efficacy parameters based on symptoms, quality of life score, voiding diary, pad-test, and urethral pressure profile at one, two, three, six and 12 months after injection. RESULTS: No immediate complication occurred and no significant variation was noted on Q(max). The only side effects possibly product-related were three cases of urinary tract infection treated by antibiotics. An acceptable safety and tolerability of the procedure whatever the injected dose of muscular cells was demonstrated. Results on efficacy after one year were heterogeneous, with 4/12 patients describing reduced urine leakage episodes, 1/12 patient presenting increased maximal closure pressure, and 8/12 patients showing improvement on pad-test. CONCLUSIONS: Cell therapy consisting of intrasphincteric injections of autologous muscular cells in patients with PPI was a feasible and safe procedure. The results point out that some subjects may positively respond to this procedure, but clinical efficacy remains to be confirmed.

[Narrow band imaging: description of the technique and initial experience with upper urinary tract carcinomas]. / Narrow Band Imaging (NBI) : mise au point sur la technique et expérience initiale pour les tumeurs de la voie excrétrice urinaire supérieure.

PURPOSE: Endoscopic treatment of upper urinary tract carcinomas (UUTC) is becoming more and more prevalent compared to non-conservative surgery. Our goal was to determine if NBI technology could improve tumour detection. MATERIAL: Twenty-seven patients with known or suspected UUTC were prospectively enrolled and treated using the Olympus URF-V flexible ureteroscope. We report 13 new cases (48%) and 14 known cases as follow up (52%). White light and NBI were subsequently performed to examine the upper urinary tract. Visual aspect of the lesions could be compared using both types of light. Biopsies were taken for all apparent lesions prior to vaporization by Holmium laser. RESULTS: Forty-three lesions were detected in 21 patients. Five lesions (14.2%) in four patients were detected through NBI light only among the 35 lesions containing UUTC. Two out of four of these patients were new cases and would not have been diagnosed with white light alone. Three UUTC-treated (8.5%) had extended margins in NBI. Thirteen biopsies (26%) were not valid. Altogether, the tumour detection rate improved by 22.7% in seven patients (25.9%) by using the NBI method. CONCLUSION: Upper urinary tract endoscopy with NBI light is a new technology that improves visualization of UUCT and enables diagnosis of lesions non visible in white light. This procedure cannot yet be recommended for daily practice and further validation of the technique is required.

[Flexible ureteroscopy in the treatment of kidney stone between 2 and 3 cm]. / Urétéroscopie souple dans le traitement des calculs du rein de 2 à 3cm.

PURPOSE: Our aim was to evaluate the outcome of flexible ureteroscopy (F-URS) with Holmium Laser as a minimal invasive procedure for kidney stone between 2 and 3 cm in diameter. MATERIAL: We prospectively evaluated 101 patients (103 kidney units) with kidney stone between 2 and 3 cm, who underwent flexible ureteroscopy (F-URS) with Holmium Laser. Patient age, sex, body mass index (BMI), stone size, stone composition, associated lower calyx stone, prestenting, congenital abnormalities, urological history, operating time and complications were evaluated. The outcome was determined at 4 weeks on plain radiograph (KUB) and noncontrast CT scan (NCCT) or by endoscopic second look if needed. Ureteroscopy success rate was defined as stone free (SF) or remaining fragments (RF) less than 3 mm. RESULTS: After F-URS session we obtained a stone free status in 35 kidney units (34%), residual fragment less than 3mm in 30 kidney units (29.1%) and 38 kidney units (36.9%) with significant residual fragment. F-URS success rate was 89.3% and 97.1% after second and third session, respectively. CONCLUSIONS: F-URS with Holmium Laser is a very effective and safe technique in treating kidney stone. This technique should be proposed to patient with kidney stone between 2 and 3 cm as one of the treatment modalities, F-URS offers excellent results, low rate of complications and short hospital stay. Patients should be informed about staged therapy.

Narrow-band imaging digital flexible ureteroscopy in detection of upper urinary tract transitional-cell carcinoma: initial experience.

PURPOSE: To characterize the appearance of normal and malignant upper urinary tract lesion appearance under narrow-band imaging (NBI) using the new URF-V digital flexible ureteroscope (DFU), and to determine if NBI, when used in conjunction with white light (WL), could improve detection of malignancy. PATIENTS AND METHODS: NBI and WL were performed in 27 patients at our university teaching hospital, 14 with known cases of upper urinary tract transitional-cell carcinoma (UUT-TCC) as follow-up (group A), and 13 patients with first-suspicion of cancer (group B). Full renal collecting system examination was performed first under WL and then under NBI by a single urologist. Biopsies were taken from all detected lesions using the biopsy forceps and sent for examination by a pathologist who was blinded to the gross description of the lesion. Pathology interpretations were then compared with the corresponding WL and NBI images. Holmium laser vaporization was performed for all apparent lesions. RESULTS: Subjectively, NBI significantly improved the endoscopic visualization of the tumors, providing a detailed description of their limits and vascular architecture. Objectively, five additional tumors (14.2%) in four patients, as well the extended limits of three tumors (8.5%) in three patients were detected by NBI when findings by WL imaging were considered normal. CONCLUSION: This is one of the first reports regarding NBI for UUT-TCC. From this study, we recommend this technology as a valuable diagnostic method, because it considerably improves tumor detection rate by 22.7% compared with WL.

Comparative expression of Hedgehog ligands at different stages of prostate carcinoma progression.

Recent studies have revealed the potential involvement of Hedgehog (Hh) signalling in proliferation and invasive behaviour of prostate carcinoma (PCa). The aim of this study was to specify the role of Sonic Hh (Shh), Desert Hh (Dhh) and Indian Hh (Ihh) in the natural history of PCa. Hh ligands expression was compared in primary hormone-naive PCa (HNPC), hormone-treated PCa (HTPC) and hormone-refractory PCa (HRPC), using immunohistochemistry. Shh and Dhh were expressed by both epithelial and stromal cells of prostate tissues. Ihh was only expressed by stromal cells. For the three ligands, mRNA and immunostaining were not correlated. In HNPC, Shh epithelial expression was significantly associated with high Gleason scores (p = 0.03), metastatic lymph nodes (p = 0.004) and Dhh epithelial staining was associated with high pT stages (p = 0.003), seminal vesicle invasion (p = 0.03) and bladder neck invasion (p = 0.0008). Negative Shh staining in stromal cells was associated with high Gleason scores (p = 0.015), high pT stages (p = 0.01) and bladder neck invasion (p = 0.04). Concomitant absence of Shh and Dhh expression in stromal cells was an independent prognostic parameter for biological recurrence on multivariate analysis (p = 0.01). Epithelial expression of Shh and Dhh was increased in HTPC compared to HNPC (p = 0.02 and p = 0.04). Interestingly, in vitro, transcript analysis also showed increased expression of these 2 Hh ligands when androgen-sensitive LNCaP cells were maintained in androgen-free medium mimicking hormonal therapy. Epithelial expression of Dhh was increased (p < 0.0001) in HRPC compared to HNPC, while stromal expression of Shh and Dhh was decreased (p < 0.0001). In conclusion, the Hh signalling pathway is associated with pejorative pathological parameters in HNPC and is up-regulated in epithelial cells of HTPC and HRPC. Moreover, the lack of Hh molecules in stromal cells seems to be associated with invasive and hormone-refractory behaviours and suggests specific changes in stromal-epithelial crosstalks during PCa progression.

p15(INK4b) in bladder carcinomas: decreased expression in superficial tumours.

The p15 gene which encodes a cyclin-dependent kinase inhibitor, is located in the 9p21 chromosomal region that is frequently deleted in human bladder transitional cell carcinomas (TCCs). The aim of the present paper is to study the potential involvement of the p15 gene in the evolution of TCCs. p15 mRNA expression was investigated by semi-quantitative RT-PCR in a series of 75 TCCs, 13 bladder cell lines and 6 normal bladder urothelia by semi-quantitative RT-PCR. p15 was expressed in the normal urothelium but p15 mRNA levels were significantly decreased in 66% of the superficial (Ta-T1) TCCs (P = 0.0015). In contrast, in muscle-invasive (T2-T4) TCCs, p15 expression differed widely between samples. p16 mRNA levels were also studied and there was no correlation between p15 and p16 mRNA levels, thus indicating that the two genes were regulated independently. Lower p15 expression in superficial tumours did not reflect a switch from quiescence to proliferative activity as normal proliferative urothelial controls did not present decreased p15 mRNA levels relative to quiescent normal urothelia. We further investigated the mechanisms underlying p15 down regulation. Homozygous deletions of the p15 gene, also involving the contiguous p16 gene, were observed in 42% of the TCCs with decreased p15 expression. No hypermethylation at multiple methylation-sensitive restriction sites in the 5;-CpG island of p15 was encountered in the remaining tumours. Our data suggest that decreased expression of p15 may be an important step in early neoplastic transformation of the urothelium and that a mechanism other than homozygous deletions or hypermethylation, may be involved in p15 down regulation.

Evaluation of cellular tumour rejection mechanisms in the peritumoral bladder wall after bacillus Calmette-Guérin treatment.

OBJECTIVE: To compare the immunological status of normal and peritumoral bladder walls, and to characterize immunocompetent cells before and during intravesical instillations of bacillus Calmette-Guérin (BCG). PATIENTS AND METHODS: Twenty-three patients with superficial urothelial bladder carcinoma (stages pTa to pT1, grades 1-3) were treated with six weekly instillations of 150 mg of BCG (Pasteur strain). Biopsies of cystoscopically normal bladder wall were taken before, 3 weeks and 3 months after BCG instillation. The controls comprised bladder biopsy specimens from 13 brain-dead ventilated kidney donors. Local infiltrating cell types, i.e. lymphocyte infiltrates (CD4, CD8, CD20, CD3, interleukin-2-receptor-positive, natural killer, gammadelta), macrophages and dendritic cells, adhesion and costimulatory molecules (ICAM-1 and B7-BB1) and major histocompatibility complex (MHC) class I and class II antigens were assessed using semi-quantitative immunohistochemical analysis. RESULTS: Before BCG the peritumoral bladder wall had fewer macrophages than control bladder wall. BCG treatment restored normal numbers of macrophages and enhanced T helper lymphocytes, B lymphocytes, natural killer cells, activated lymphocytes, dendritic cells, normal MHC class I, adhesion (ICAM-1) and costimulatory (B7-BB1) expression. The enhancement of these immunological variables was transient, with a return to baseline 3 months after BCG instillation. CONCLUSIONS: These results support the concept that there is a host-immune escape associated with bladder cancer. BCG therapy may temporarily restore impaired tumour rejection mechanisms in the peritumoral bladder wall, suggesting a need for maintenance therapy after the first course of BCG.

Frequent FGFR3 mutations in papillary non-invasive bladder (pTa) tumors.

We recently identified activating mutations of fibroblast growth factor receptor 3 (FGFR3) in bladder carcinoma. In this study we assessed the incidence of FGFR3 mutations in a series of 132 bladder carcinomas: 20 carcinoma in situ (CIS), 50 pTa, 19 pT1, and 43 pT2-4. All 48 mutations identified were identical to the germinal activating mutations that cause thanatophoric dysplasia, a lethal form of dwarfism. The S249C mutation, found in 33 of the 48 mutated tumors, was the most common. The frequency of mutations was higher in pTa tumors (37 of 50, 74%) than in CIS (0 of 20, 0%; P < 0.0001), pT1 (4 of 19, 21%; P < 0.0001) and pT2-4 tumors (7 of 43, 16%; P < 0.0001). FGFR3 mutations were detected in 27 of 32 (84%) G1, 16 of 29 (55%) G2, and 5 of 71 (7%) G3 tumors. This association between FGFR3 mutations and low grade was highly significant (P < 0.0001). FGFR3 is the first gene found to be mutated at a high frequency in pTa tumors. The absence of FGFR3 mutations in CIS and the low frequency of FGFR3 mutations in pT1 and pT2-4 tumors are consistent with the model of bladder tumor progression in which the most common precursor of pT1 and pT2-4 tumors is CIS.

Hormone-refractory prostate cancer: a multi-step and multi-event process.

Since the pioneering studies of Huggins in 1941, it has been known that prostate cancer cells, like certain normal epithelial cells, can chronically depend on a critical level of androgenic stimulation for their continuous growth and survival. The entire issue of the development of resistance to androgen ablation therapy for metastatic prostate cancer is based on the fact that a portion of cells can survive without androgen stimulation. The cell mechanism of androgen independent status is unclear. For some authors, a portion of the cells present within a patient with a prostate cancer before therapy is naturally androgen independent (selection hypothesis). However, this hypothesis does not consider gene alteration during prostate cancer natural history and probably hormone-refractory prostate cancer (HRPC) is due to a multi-step and multi-event process. In this literature review, different cell pathways that lead to HRPC are described.Prostate Cancer and Prostatic Diseases (2001) 4, 204-212.

Induction of apoptosis and inhibition of cell proliferation by the lipido-sterolic extract of Serenoa repens (LSESr, Permixon in benign prostatic hyperplasia.

BACKGROUND: To determine the mechanism by which prostate volume increases during the development of BPH and to evaluate the effect of LSESr (Permixon), a phytotherapeutic agent, we investigated apoptosis and cell proliferation in the stroma and epithelium of normal prostate and of BPH tissues from patients treated with or without LSESr. METHODS: MIB-1 staining and the in situ end-labeling assay were used to evaluate the proliferative-apoptotic balance in normal prostates and in BPH tissues. Quantitative assessment was performed using an image analysis system. RESULTS: In normal prostates, there was no significant difference between apoptotic and proliferative indices. Cell numbers and proliferative indices were higher in BPH than in normal prostates, while apoptosis values were similar. In the BPH treated group, LSESr significantly inhibited proliferation and induced cell death in both epithelium and stroma. CONCLUSIONS: Induction of apoptosis and inhibition of cell proliferation are likely to be the basis for the clinical efficacy of LSESr.

Low E-cadherin expression in bladder cancer at the transcriptional and protein level provides prognostic information.

We studied E-cadherin down-regulation at the protein level in frozen sections of 111 bladder tumours and 13 normal bladder specimens by means of immunohistochemistry, and at the mRNA level by semi-quantitative RT-PCR in 40 of the same tumours. Results indicate that E-cadherin expression detected by immunohistochemistry correlated with both stage and grade (P < 0.0001 and P < 0.001, respectively). Analysis of recurrence, progression and survival over a mean period of 36 months after surgery in the entire cohort showed that abnormal E-cadherin immunoreactivity correlated strongly with poor outcome (log-rank test: P = 0.001, P = 0.0001 and P = 0.0003, respectively). In multistep logistic regression analysis, only E-cadherin status and stage had significant additional prognostic value (P= 0.008 and OR = 0.2; P= 0.03 and OR = 3.6, respectively). Survival estimates derived from RT-PCR transcript quantification differed significantly for low and high expression (log-rank test: P = 0.0006). These results suggest that the alteration occurs at the transcriptional level and support the clinical and biological relevance of cell adhesion molecules in bladder cancer.

Tumour suppressive properties of fibroblast growth factor receptor 2-IIIb in human bladder cancer.

FGFRs (fibroblast growth factor receptors) are encoded by four genes (FGFR1-4). Alternative splicing results in various receptor isoforms. The FGFR2-IIIb variant is present in a wide variety of epithelia, including the bladder epithelium. Recently, we have shown that FGFR2-IIIb is downregulated in a subset of transitional cell carcinomas of the bladder, and that this downregulation is associated with a poor prognosis. We investigated possible tumour suppressive properties of FGFR2-IIIb by transfecting two human bladder tumour cell lines, J82 and T24, which have no endogenous FGFR2-IIIb expression, with FGFR2-IIIb cDNA. No stable clones expressing FGFR2-IIIb were isolated with the J82 cell line. For the T24 cell line, stable transfectants expressing FGFR2-IIIb had reduced growth in vitro and formed fewer tumours in nude mice which, in addition, grew more slowly. The potential mechanisms leading to decreased FGFR2-IIIb mRNA levels were also investigated. The 5' region of the human FGFR2 gene was isolated and found to contain a CpG island which was partially methylated in more than half the cell lines and tumours which do not express FGFR2-IIIb. No homozygous deletion was identified in any of the tumours or cell lines with reduced levels of FGFR2-IIIb. Mutational analysis of the entire coding region of FGFR2-IIIb at the transcript level was performed in 33 bladder tumours. In addition to normal FGFR2-IIIb mRNA, abnormal transcripts were detected in two tumour samples. These abnormal mRNAs resulted from exon skipping which affected the region encoding the kinase domain. Altogether, these results show that FGFR2-IIIb has tumour growth suppressive properties in bladder carcinomas and suggest possible mechanisms of FGFR2 gene inactivation.

Relationship between E-cadherin and fibroblast growth factor receptor 2b expression in bladder carcinomas.

E-cadherin is a cell-cell adhesion molecule expressed predominantly by epithelial cells. Reduction or loss of E-cadherin immunoreactivity has been associated with tumour progression in many epithelial cancers, including bladder carcinomas. The fibroblast growth factor receptor 2b (FGFR2b) recognized specifically by FGF7 is expressed only by epithelial cells. Recently, decreased expression of FGFR2b protein and mRNA was found to be associated with tumour progression in bladder carcinomas. The purpose of this investigation was to look for a possible relationship between E-cadherin and FGFR2b expression in bladder carcinomas. As decreased E-cadherin immunoreactivity was found to correlate directly with decreased expression at the mRNA level, the possible relationship between E-cadherin and FGFR2b was investigated at the mRNA level using semi-quantitative RT - PCR in 92 transitional cell carcinomas (TCCs) and four lymph node metastases. All tumours with low E-cadherin expression had low expression of FGFR2b, whereas tumours with low FGFR2b mRNA could express any level of E-cadherin mRNA. The same observation was equally valid for bladder and colon cancer cell lines suggesting that, besides bladder tumours, this relationship could apply to other carcinomas types. These results suggest that a relationship exists between the transcription of the E-cadherin and FGFR2b genes preventing high expression of FGFR2b where expression of E-cadherin is low. We suggest that reduced expression of FGFR2b in conjunction with decreased expression of E-cadherin may contribute to the aggressive behaviour attributable to high grade TCCs.

Differences in steroid 5alpha-reductase iso-enzymes expression between normal and pathological human prostate tissue.

We studied the expression level and cell-specific expression patterns of 5alpha-reductase (5alpha-R) types 1 and 2 iso-enzymes in human hyperplastic and malignant prostate tissue by semi-quantitative RT-PCR and in situ hybridisation analyses. In situ hybridisation established that 5alpha-R1 mRNA is preferentially expressed by epithelial cells and little expressed by stromal cells whereas 5alpha-R2 mRNA is expressed by both epithelium and stroma. Semi-quantitative RT-PCR has been performed on total RNA from different zones of normal prostate, BPH tissues and liver. We found that 5alpha-R1 and 5alpha-R2 mRNAs expression was near the same in all zones of normal prostate. In BPH tissue, 5alpha-R1 and 5alpha-R2 mRNAs expression was slightly but significantly increased, when it was compared to the levels recorded for normal prostate. In cancer samples, 5alpha-R1 mRNA expression was higher than in normal and hyperplastic prostate but the level of 5alpha-R2 mRNA was not statistically different from that observed in the different zones of normal prostate. In liver, 5alpha-R2 mRNA level was similar to that measured in BPH but 5alpha-R1 mRNA expression was ten times higher. The increase observed in 5alpha-R isoenzymes expression in BPH tissue could play an important role in the pathogenesis and/or maintenance of the disease.

Modulation of cytokeratin subtype, EGF receptor, and androgen receptor expression during progression of prostate cancer.

After initial regression in response to androgen deprivation, most prostate cancers develop resistance to endocrine therapy. Identification of cellular and molecular changes occurring during endocrine therapy-induced regression and subsequent hormone insensitivity may point to mechanisms underlying the transition to hormone-independent prostate cancer. A series of untreated (n = 24), regressed (n = 15), and endocrine therapy-resistant (n = 10) prostatic adenocarcinomas were analyzed using immunohistochemistry with regard to cytokeratin 5 and 18, androgen receptor (AR), and epidermal growth factor receptor (EGF-R) expression in tumor cells. Using semiquantitative reverse transcription-polymerase chain reaction, the amount of AR mRNA also was determined. In regressed and therapy-resistant prostate cancers, an increase in cytokeratin 5-positive tumor cells was noted when compared with untreated carcinomas. Similarly, the proportion of EGF-R-positive tumor cells increased in the treated cases, whereas the proportion of AR-positive tumor cells dropped in regressed carcinomas and increased in hormone-refractory cancers. In the latter group, an eightfold higher level of AR mRNA was observed when compared with the other cases. Changes in the proportion of cytokeratin 5 and EGF-R-positive tumor cells suggests that during androgen deprivation an enlarged subpopulation of tumor cells with combined features of basal and secretory phenotypes arises. The increased proportion of AR-positive tumor cells during the transition from the regression phase to the hormone escape phase points to an important role of AR overexpression in this process.

Frequent loss of heterozygosity on chromosome 10q in muscle-invasive transitional cell carcinomas of the bladder.

Loss of heterozygosity (LOH) on chromosome 10 has been observed in several human cancers including glioblastomas, meningiomas, melanomas and endometrial and prostate carcinomas. We have investigated the incidence of LOH on chromosome 10 in 36 human transitional cell carcinomas (TCCs) of the bladder, three upper urinary tract TCCs and one lymph node metastasis, using a panel of 27 highly polymorphic markers spanning 10p (short arm) and 10q (long arm). Fourteen bladder tumours (39%), the three upper urinary tract tumours and the lymph node metastasis showed LOH for at least one locus on chromosome 10. Remarkably, LOH on chromosome 10 was observed mainly in muscle-invasive (P = 0.01) and high grade tumours (P = 0.03). For five tumours and the lymph node metastasis, LOH was found at all informative loci, indicating monosomy or isodisomy of chromosome 10. The deletion mapping of the tumours with partial loss delineated two minimal regions of loss on chromosome 10q. One region, the most telomeric, was bounded by markers D10S214 and D10S169 and the other, the most proximal, was bounded by markers D10S222 and D10S531. Our results demonstrate that chromosome 10q LOH is common in muscle-invasive bladder cancers and that two potential tumour suppressor loci, at 10q24.1-q24.3 and 10q26.1-q26.2, may contribute to the malignant progression of these tumours. Localization of the smallest common regions of loss in bladder tumours provides a starting point for the identification of the genes involved.

Decreased expression of keratinocyte growth factor receptor in a subset of human transitional cell bladder carcinomas.

Growth factors and growth factor receptors are involved in tumor progression. The fibroblast growth factor receptor 2 gene encodes distinct isoforms. The isoforms which bind KGF (keratinocyte growth factor or FGF-7) are called KGF-R or FGFR2b. KGF-R is expressed in different epithelia and is involved in the control of epithelial-mesenchymal interactions. Expression of KGF-R mRNA was examined in normal human bladder and transitional cell carcinoma of the bladder (TCC) by semi-quantitative RT-PCR using TFIID and GAPDH as internal standards. In normal bladder, the KGF-R mRNA was detected in the urothelium but not in the underlying stroma. In TCCs, the level of KGF-R mRNA was generally either normal or low. Eighteen out of 54 TCCs had a KGF-R mRNA level below 30% of that found in normal urothelium. This decrease in KGF-R mRNA was not accompanied by an increase in BEK (FGFR2c) mRNA, the other major splice variant of the fibroblast growth factor receptor 2 gene. Expression of the KGF-R was also monitored by immunohistochemistry using a functional KGF-immunoglobulin chimera. The receptor was uniformly expressed throughout the normal urothelium except for the umbrella cells. Immunoreactivity for KGF-R was found to be negative in tumors with low levels of KGF-R mRNA, while the peritumoral normal urothelium was positive. Among patients with muscle invasive tumors, those exhibiting a low level of KGF-R mRNA had a significantly higher proportion of cancer deaths. Our results suggest that decreased expression of KGF-R can be considered as a marker of tumor progression in muscle invasive TCCs.

Functions of fibroblast and transforming growth factors in primary organoid-like cultures of normal human urothelium.

Previous studies have indicated that growth factors such as epidermal growth factor, transforming growth factor alpha, and fibroblast growth factor 1 (FGF-1) have important regulatory functions in murine urothelial wound healing and tumorigenesis. Immunocytochemical analyses suggest that these factors are also involved in human urothelium. Yet, little is known about the functional effects of these growth factors on human urothelial cells. We established organoid-like primary cultures of normal human urothelium on porous membranes. Direct functional effects of growth factors were examined on confluent cultures reflecting intact urothelium. Immunocytochemistry was performed with a panel of specific antibodies against growth factors and their receptors on both cultures and the corresponding tissue sections. Lacking the appropriate antibodies, we performed reverse transcriptase PCR to detect FGF receptor mRNA in cultures and dissected tissue. The proliferation was stimulated by transforming growth factor alpha, FGF-1, and weakly by FGF-7, but not by FGF-2. TGF beta 1 inhibited proliferation. In contrast to mouse urothelium, none of the growth factors showed an effect on differentiation. The functional data correlate with the urothelial expression of epidermal growth factor receptors, TGF beta receptor types I and II, the (low) protein expression of FGF receptor 1, and the presence of FGF-7 receptor (FGF receptor 2 (IIIb)) mRNA. The organotypic nature of the cultures permits the study of growth factor interactions between urothelial cells. The data indicate that FGF-1, transforming growth factor alpha, and TGF beta 1 contribute differently to the maintenance of human urothelium.

[Renoenterocolic fistula]. / Fistula renoenterocólica.

We present a case of reno-entero-colic fistula which is extremely rare and which, in the face of unspecific clinical pictures requires a detailed examination. Its physiopathology, the surgical problems which it poses and the means of solving these, are explained.