Loss of WNT4 in the gubernaculum causes unilateral cryptorchidism and fertility defects.

Undescended testis (UDT) affects 6% of male births. Despite surgical correction, some men with unilateral UDT may experience infertility with the contralateral descended testis (CDT) showing no A-dark spermatogonia. To improve our understanding of the etiology of infertility in UDT, we generated a novel murine model of left unilateral UDT. Gubernaculum-specific Wnt4 knockout (KO) mice (Wnt4-cKO) were generated using retinoic acid receptor ß2-cre mice and were found to have a smaller left-unilateral UDT. Wnt4-cKO mice with abdominal UDT had an increase in serum follicle-stimulating hormone and luteinizing hormone and an absence of germ cells in the undescended testicle. Wnt4-cKO mice with inguinal UDT had normal hormonal profiles, and 50% of these mice had no sperm in the left epididymis. Wnt4-cKO mice had fertility defects and produced 52% fewer litters and 78% fewer pups than control mice. Wnt4-cKO testes demonstrated increased expression of estrogen receptor α and SOX9, upregulation of female gonadal genes, and a decrease in male gonadal genes in both CDT and UDT. Several WNT4 variants were identified in boys with UDT. The presence of UDT and fertility defects in Wnt4-cKO mice highlights the crucial role of WNT4 in testicular development.

Impact of cytogenetic abnormalities on the risk of disease progression in solitary bone plasmacytomas.

Most patients with solitary bone plasmacytomas (SBP) progress to multiple myeloma (MM) after definitive radiation therapy as their primary treatment. Whether the presence of high-risk (HR) cytogenetic abnormalities by fluorescence in situ hybridization (FISH) in the clonal plasma cells, obtained either directly from the diagnostic SBP tissue or the corresponding bone marrow examination at the time of diagnosis, is associated with a shorter time to progression (TTP) to MM is unknown. This study evaluated all patients diagnosed with SBP at the Mayo Clinic from January 2012 to July 2022. The presence of del(17p), t(14;16), t(4;14), or +1q (gain or amplification) by FISH in clonal plasma cells was defined as HR. A total of 114 patients were included in this cohort, and baseline FISH was available for 55 patients (48%), of which 22 were classified as HR (40%). The median TTP to MM for patients with SBP and HR FISH was 8 months (95% confidence interval [CI], 6.3-26) compared with 42 months (95% CI, 25-not reached [NR]) in patients with SBP without HR FISH (P < .001). In a multivariate analysis, only HR FISH was a significant predictor for shorter TTP to MM, independent of minimal marrow involvement and an abnormal serum free light chain ratio at diagnosis. Deletion (17p) and gain 1q abnormalities were the most common FISH abnormalities responsible for the short TTP to MM. Thus, assessing for HR FISH abnormalities in clonal plasma cells derived from either the diagnostic SBP tissue or the staging bone marrow examination of patients with newly diagnosed SBP is feasible and prognostic for a shorter TTP to MM.

Regulation of androgen receptor stability by the ß1 Pix/STUB1 complex.

The androgen receptor (AR) is essential in the development and differentiation of testes and male genitalia. AR expression is tightly regulated at the translational and posttranslational levels. AR posttranscriptional regulation is a major determinant of AR availability since AR is a direct target of E3 ubiquitin ligase STUB1. Our work indicated that the Rac/Cdc42 guanosine triphosphatase guanine nucleotide exchange factor, ß1 Pix, enhanced AR levels after AR stimulation in HEK293 and HeLa cells. AR stimulation decreased AR ubiquitination which is accompanied by increased ß1 Pix binding to AR. Ectopic expression of ß1 Pix decreased AR ubiquitination in Tm4 and HEK293 cells. We demonstrated that the formation of a multimolecular complex comprised of AR/ß1 Pix/STUB1 responded in a time-dependent manner to AR stimulation. ß1 Pix binding dissociated STUB1 from AR and thus prevented STUB1 from catalyzing receptor ubiquitination. ß1 Pix enhanced AR transcriptional activity and increased AR target gene expression. Irrespective of treatment, immunofluorescence analysis showed a strong nuclear colocalization of endogenous AR and endogenous ßPix in Tm4 cells. However, using Tm4 cell fractionation, AR stimulation decreased ßPix/AR association in the cytosolic fraction and increased binding of AR to ßPix in the nuclear fraction. To support the role of ß1 Pix in androgen regulation, we found that individuals lacking this gene have a significant increase in genitourinary malformations associated with androgen dysfunction. Our data indicate that ß1 Pix is an important modulator of AR stability and ligand-dependent AR transcriptional activity. We propose that ß1 Pix could serve as a promising therapeutic target to modulate AR signaling.

E2F1 regulates testicular descent and controls spermatogenesis by influencing WNT4 signaling.

Cryptorchidism is the most common urologic birth defect in men and is a predisposing factor of male infertility and testicular cancer, yet the etiology remains largely unknown. E2F1 microdeletions and microduplications contribute to cryptorchidism, infertility and testicular tumors. Although E2f1 deletion or overexpression in mice causes spermatogenic failure, the mechanism by which E2f1 influences testicular function is unknown. This investigation revealed that E2f1-null mice develop cryptorchidism with severe gubernacular defects and progressive loss of germ cells resulting in infertility and, in rare cases, testicular tumors. It was hypothesized that germ cell depletion resulted from an increase in WNT4 levels. To test this hypothesis, the phenotype of a double-null mouse model lacking both Wnt4 and E2f1 in germ cells was analyzed. Double-null mice are fertile. This finding indicates that germ cell maintenance is dependent on E2f1 repression of Wnt4, supporting a role for Wnt4 in germ cell survival. In the future, modulation of WNT4 expression in men with cryptorchidism and spermatogenic failure due to E2F1 copy number variations may provide a novel approach to improve their spermatogenesis and perhaps their fertility potential after orchidopexy.

PRSS50 is a testis protease responsible for proper sperm tail formation and function.

Multiple morphological abnormalities of the sperm flagella (MMAF) are a major cause of asthenoteratozoospermia. We have identified protease serine 50 (PRSS50) as having a crucial role in sperm development, because Prss50-null mice presented with impaired fertility and sperm tail abnormalities. PRSS50 could also be involved in centrosome function because these mice showed a threefold increase in acephalic sperm (head-tail junction defect), sperm with multiple heads (spermatid division defect) and sperm with multiple tails, including novel two conjoined sperm (complete or partial parts of several flagellum on the same plasma membrane). Our data support that, in the testis, as in tumorigenesis, PRSS50 activates NFκB target genes, such as the centromere protein leucine-rich repeats and WD repeat domain-containing protein 1 (LRWD1), which is required for heterochromatin maintenance. Prss50-null testes have increased IκκB, and reduced LRWD1 and histone expression. Low levels of de-repressed histone markers, such as H3K9me3, in the Prss50-null mouse testis may cause increases in post-meiosis proteins, such as AKAP4, affecting sperm formation. We provide important insights into the complex mechanisms of sperm development, the importance of testis proteases in fertility and a novel mechanism for MMAF.

Gene dosage changes in KCTD13 result in penile and testicular anomalies via diminished androgen receptor function.

Despite the high prevalence of hypospadias and cryptorchidism, the genetic basis for these conditions is only beginning to be understood. Using array-comparative-genomic-hybridization (aCGH), potassium-channel-tetramerization-domain-containing-13 (KCTD13) encoded at 16p11.2 was identified as a candidate gene involved in hypospadias, cryptorchidism and other genitourinary (GU) tract anomalies. Copy number variants (CNVs) at 16p11.2 are among the most common syndromic genomic variants identified to date. Many patients with CNVs at this locus exhibit GU and/or neurodevelopmental phenotypes. KCTD13 encodes a substrate-specific adapter of a BCR (BTB-CUL3-RBX1) E3-ubiquitin-protein-ligase complex (BCR (BTB-CUL3-RBX1) E3-ubiquitin-protein-ligase complex (B-cell receptor (BCR) [BTB (the BTB domain is a conserved motif involved in protein-protein interactions) Cullin3 complex RING protein Rbx1] E3-ubiqutin-protein-ligase complex), which has essential roles in the regulation of cellular cytoskeleton, migration, proliferation, and neurodevelopment; yet its role in GU development is unknown. The prevalence of KCTD13 CNVs in patients with GU anomalies (2.58%) is significantly elevated when compared with patients without GU anomalies or in the general population (0.10%). KCTD13 is robustly expressed in the developing GU tract. Loss of KCTD13 in cell lines results in significantly decreased levels of nuclear androgen receptor (AR), suggesting that loss of KCTD13 affects AR sub-cellular localization. Kctd13 haploinsufficiency and homozygous deletion in mice cause a significant increase in the incidence of cryptorchidism and micropenis. KCTD13-deficient mice exhibit testicular and penile abnormalities together with significantly reduced levels of nuclear AR and SOX9. In conclusion, gene-dosage changes of murine Kctd13 diminish nuclear AR sub-cellular localization, as well as decrease SOX9 expression levels which likely contribute in part to the abnormal GU tract development in Kctd13 mouse models and in patients with CNVs in KCTD13.

Failure of mobilization of hematopoietic stem cells associated with elevated serum levels of anti-CD38 monoclonal antibody.

Daratumumab is an anti-CD38 antibody that is increasingly incorporated in induction regimens for treating patients with newly diagnosed multiple myeloma (NDMM). Previous reports have demonstrated a lower yield of hematopoietic stem cells (HSCs) after induction with daratumumab; however, none of them reported a failure to collect an adequate number of HSCs. We describe a case of adequate HSC mobilization failure in a patient who inadvertently received excessive doses of daratumumab and was confirmed by higher-than-expected circulating levels of daratumumab by mass spectrometry. Eventual clearance of circulating daratumumab was associated with the successful mobilization and harvesting of HSCs.

nanoNET: machine learning platform for predicting nanoparticles distribution in a polymer matrix.

Polymer nanocomposites (PNCs) offer a broad range of thermophysical properties that are linked to their compositions. However, it is challenging to establish a universal composition-property relationship in PNCs due to their wide-ranging composition and chemical space. Here, we address this problem and develop a new method to model the composition-microstructure relation of a PNC through an intelligent machine-learning pipeline named nanoNET. The nanoNET is a nanoparticles (NPs) distribution predictor, built upon computer vision and image recognition concepts. It integrates unsupervised deep learning and regression in a fully automated pipeline. We conduct coarse-grained molecular dynamics simulations of PNCs and utilize the data to establish and validate the nanoNET. Within this framework, a random forest regression model predicts the distribution of NPs in a PNC in a latent space. Subsequently, a convolutional neural network-based decoder converts the latent space representation to the actual radial distribution function (RDF) of NPs in the given PNC. The nanoNET predicts NPs distribution in many unknown PNCs very accurately. This method is very generic and can accelerate the design, discovery, and fundamental understanding of composition-microstructure relationships in PNCs and other molecular systems.

Analysing online Twitter discussions of bedwetting via a condition-specific hashtag (#Bedwetting).

AIM: Bedwetting is a common paediatric condition. #Bedwetting has been established as the official hashtag to structure Twitter discussions about the condition. We analysed online Twitter discussions for #Bedwetting. METHODS: Symplur, a Twitter analytics service was employed to aggregate Twitter activity, users and content including #Bedwetting, between October 2013 and November 2018. Activity was analysed via tweet volume and user adoption. Users were assorted using geographic location, occupation and affiliation data. Content in #Bedwetting Tweets was undertaken by retrieving information about retweets, links, frequently used words and hashtags. RESULTS: A total of 101 412 tweets and 9957 users utilising #Bedwetting were identified. Most tweets were sent with links (93%). The average ± SD number of tweets using #Bedwetting per month increased from 96 ± 87 in 2013 to 2935 ± 1644 in 2015. Tweet volume decreased to 1960 ± 257 in 2016 and subsequently increased to 2901 ± 1110 in 2017. New users increased from 4 in 2013 to 9957 users in 2018. Users tweeted from 69 countries. Advocacy organisations comprised 35% of the top 100 influencers. Common words in #Bedwetting tweets were 'potty', 'best' and 'training'. Popular associated hashtags were #Pottytraining, #Solutions and #Moms. Hyperlinks in #Bedwetting tweets included advocacy, academic and commercial websites. CONCLUSIONS: Our analysis of #Bedwetting highlights that Twitter is frequently used to discuss the condition's diagnosis and management. Various stakeholders in health care are utilising the platform to build awareness about bedwetting. We identified that Twitter is being employed to drive web traffic to other internet websites.

Obstructive Jaundice from Metastatic Squamous Cell Carcinoma of the Lung.

Obstructive jaundice from metastatic lung cancer is extremely rare. Most reported cases have had small cell cancer of lung or adenocarcinoma of lung as primary malignancy metastasizing to the biliary system. We report the case of a patient presenting with symptoms of obstructive jaundice found to have metastatic involvement of hepatobiliary system from squamous cell cancer (SCC) of lung. ERCP (endoscopic retrograde cholangiopancreatography) with biliary stenting is the procedure of choice in such patients. Our case is made unique by the fact that technical difficulties made it difficult for the anesthesiologists to intubate the patient for an ERCP. As a result percutaneous transhepatic cholangiogram (PTC) with internal-external biliary drainage was performed.

Complications following Staged Hypospadias Repair Using Transposed Preputial Skin Flaps.

PURPOSE: Proximal hypospadias repair using a staged approach is a complex reconstructive operation with the potential for significant complications requiring repeat surgery. We report outcomes of staged hypospadias repair using transposed preputial skin flaps and factors predictive of postoperative complications. MATERIALS AND METHODS: We retrospectively analyzed patients who underwent staged proximal hypospadias repair using transposed preputial skin flaps between 2002 and 2013. Patient demographics, operative details, complications, reoperations and factors predictive of complications were reviewed. RESULTS: A total of 56 patients were identified with a mean age of 14.1 months (median 14.3) at first stage. Mean followup was 38.6 months (median 34.1). Complications requiring additional unplanned operation(s) were observed in 38 patients (68%), including fistulas in 32 (57%), diverticula in 8 (14%), meatal stenosis in 5 (9%), urethral stricture in 8 (14%) and glans dehiscence in 3 (5%). In addition, redo first stage repair was performed in 4 patients (7%). Since some patients had more than 1 complication, the total number of complications is greater than the number of patients undergoing a redo operation. On univariate analyses the use of small intestinal submucosa was significantly associated with an increased risk of fistula (91% vs 49%, p = 0.02) and urethral diverticulum (64% vs 24%, p = 0.04). Incision of the tunica albuginea of the corpora was associated with an increased likelihood of fistula (77% vs 44%, p = 0.03). Finally, patients with glans dehiscence were significantly younger at first stage (5.8 vs 14.8 months, p = 0.01). CONCLUSIONS: The reoperation rate for complications in children undergoing staged hypospadias repair using transposed preputial skin flaps is higher than previously reported.

Outcomes of endoscopic incision for the treatment of ureterocele in children at a single institution.

PURPOSE: We assessed outcomes in children with ureterocele after transurethral incision at our institution between 2001 and 2014, focusing on end points of vesicoureteral reflux, improvement of hydronephrosis and need for second surgery. MATERIALS AND METHODS: We performed chart reviews of 83 patients, collecting information including age at transurethral incision, gender, renal anatomy, ureterocele location, indication for transurethral incision, and preincision and postincision vesicoureteral reflux and hydronephrosis status. Patients were divided into those with single system and duplex system ureteroceles, and intravesical and extravesical location for analysis. Statistical evaluations were performed with the Wilcoxon rank test and Fisher exact test. RESULTS: Transurethral incision was performed at a mean age of 34.2 months in patients with single system ureterocele and 8.9 months in those with duplex system ureterocele (p <0.0001). Cure rates (improvement of hydronephrosis and absence of vesicoureteral reflux) were 55.6% in patients with single system ureterocele and 14.9% in those with duplex system ureterocele (p = 0.0031). Rates of de novo reflux into the ureterocele moiety were 27.8% for patients with single system ureterocele and 56.2% for those with duplex system ureterocele (p = 0.0773). Patients with single system ureterocele required significantly fewer second surgeries (3.8%) than those with duplex system ureterocele (73.7%, p <0.0001). CONCLUSIONS: Patients with single system ureterocele may benefit from endoscopic incision. Transurethral incision was definitive in all such patients except 1 in our study. Although most patients with duplex system ureterocele will need a second operation, transurethral incision remains of value in this population in instances of sepsis or bladder outlet obstruction, or to facilitate planned reconstruction when the child is older.

Inguinal Polyorchidism Found Incidentally During Orchiopexy in 9-Year-Old Male: A Case Report and Review of Orchiopexy of Nonscrotal Supernumerary Testes.

Polyorchidism, the presence of more than two testes, usually presents as a painless scrotal mass or is diagnosed incidentally during the management of another condition.1 It is a rare congenital abnormality with approximately 200 reported cases in the literature. Most cases are found on the left side within the scrotum. We report a case of right-sided polyorchidism in a 9-year-old patient found incidentally during inguinal orchiopexy. As there is debate on the management of polyorchidism, a careful approach is required as the surgeon must decide between either scrotal fixation or the removal of the supernumerary testis. This case report will discuss the anatomical and clinical considerations when making this decision.

A large urachal cyst presenting with lower urinary tract symptoms and a falsely elevated post-void residual on bladder scan.

The urachus is an embryologic remnant that connects the bladder to the umbilicus and typically obliterates during gestation. Urachal cysts are one of the most common congenital urachal anomalies. Urachal cysts may be found incidentally on imaging or present as a palpable mass with abdominal pain and fever. We present a case of a young male with a urachal cyst who presented with lower urinary tract symptoms and a falsely elevated post void residual (PVR) volume on bladder scan. This case illustrates an atypical presentation of a large urachal cyst and highlights the limitations of bladder scanner post-void residual determination.

Management of urachal anomalies in pediatric patients: A comparison of treatment strategies between pediatric urology and general surgery.

INTRODUCTION: Persistence of embryonic urachal structures due to a failure of the urachus to involute into the median umbilical ligament is known as a urachal anomaly (UA). UAs may remain asymptomatic or lead to abdominal pain and recurrent infections. Management of UAs in pediatric patients has historically lacked a clear consensus between conservative and surgical management. While both urologists and general surgeons manage this pathology, a comparison of management style and outcomes between these specialties has not been published to our knowledge. OBJECTIVE: To (1) evaluate trends in management of UAs among pediatric urologists and general surgeons across three tertiary care children's hospitals and (2) identify factors that place patients at higher risk for requiring surgery. STUDY DESIGN: All patients diagnosed with a UA from 2016 to 2020 at our multi-site institution were identified by ICD-10 code Q64.4 "malformation of the urachus" and retrospectively reviewed. Patient demographics, treatment specialty, remnant subtype, and management strategy were recorded. Data was dichotomized between both urology and general surgery as well as between surgical and nonsurgical intervention to identify and compare management strategies. RESULTS: Overall, 143 patients diagnosed with UAs were identified. Of these patients, 74 were treated by urology and 69 were treated by general surgery. Patients who were treated by urology were significantly more likely to receive conservative treatment (66.2% treated conservatively vs. 33.8% treated surgically), while patients treated by general surgery were significantly more likely to undergo surgery (84.1% treated surgically vs. 15.9% treated conservatively, p < .0001). Though, urology was more likely to treat patients who presented incidentally (p < .01), and general surgery was more likely to treat patients who presented with an infected remnant (p < .01). Patients of male sex were more likely overall to receive surgery compared to female patients (p < .01). DISCUSSION: Management of UAs by urologists was more conservative than general surgeons. However, both specialties treat distinctly different patient presentations, with urology managing more incidental remnants and general surgery operating on more emergent, infected urachi. Limitations of the study included its retrospective nature and the insufficient reporting of urachal remnant subtypes and presence of infection among patients. CONCLUSIONS: Management strategies of UAs differ among urology and general surgery, but surgical and conservative treatments are necessary to appropriately treat their distinct patient populations. This study provides valuable insight into current practices of UA management and may help to inform future treatment.

Increased smooth muscle contractility in mice deficient for neuropilin 2.

Neuropilins (NRPs) are transmembrane receptors that bind class 3 semaphorins and VEGF family members to regulate axon guidance and angiogenesis. Although expression of NRP1 by vascular smooth muscle cells (SMCs) has been reported, NRP function in smooth muscle (SM) in vivo is unexplored. Using Nrp2(+/LacZ) and Nrp2(+/gfp) transgenic mice, we observed robust and sustained expression of Nrp2 in the SM compartments of the bladder and gut, but no expression in vascular SM, skeletal muscle, or cardiac muscle. This expression pattern was recapitulated in vitro using primary human SM cell lines. Alterations in cell morphology after treatment of primary visceral SMCs with the NRP2 ligand semaphorin-3F (SEMA3F) were accompanied by inhibition of RhoA activity and myosin light chain phosphorylation, as well as decreased cytoskeletal stiffness. Ex vivo contractility testing of bladder muscle strips exposed to electrical stimulation or soluble agonists revealed enhanced tension generation of tissues from mice with constitutive or SM-specific knockout of Nrp2, compared with controls. Mice lacking Nrp2 also displayed increased bladder filling pressures, as assessed by cystometry in conscious mice. Together, these findings identify Nrp2 as a mediator of prorelaxant stimuli in SMCs and suggest a novel function for Nrp2 as a regulator of visceral SM contractility.

The impact of discrete modes of spinal cord injury on bladder muscle contractility.

BACKGROUND: Prior studies have compared the effect of spinal cord injury elicited using distinct approaches on motor and visceral function. However, the impact of such discrete modes of injury specifically on bladder muscle contractility has not been explored in detail. The goal of this study is to compare the impact of complete spinal cord transection versus clip compression at thoracic vertebra eight (T8) on bladder muscle contractility. METHODS: Rats underwent no treatment (Control), laminectomy (Sham, SH); complete extradural transection (TX); or cord compression with an aneurysm clip (CX). Bladders and spinal cords were harvested at 6 wk for contractility studies or histological analysis. RESULTS: Detrusor strips from TX and CX rats showed higher spontaneous activity than those from SH rats. Furthermore, the duration of the neurally-mediated contractile response was longer in TX and CX rats compared to controls and showed attenuated relaxation. No significant differences were observed between muscle strips from SH, TX or CX rats in response to KCl, ATP or phenylephrine. However, tissues from TX and CX rats showed a higher sensitivity to carbachol compared to that from SH animals. CONCLUSIONS: Complete SCI in rats either by cord transection or compression elicits qualitatively similar changes in bladder muscle contractility. Whereas cord transection is arguably easier to perform experimentally, cord compression better models the situation observed clinically, such that each approach has clear advantages and limitations.

A rare complication of secondary pneumothorax following exploratory laparotomy for a small bowel obstruction: Case report.

INTRODUCTION: Small bowel obstruction (SBO) is recognized as the most common surgical emergency following abdominal procedures. Moreover, a pneumothorax secondary to an SBO is an infrequent phenomenon less commonly reported in recent literature. Clinical presentation includes progressive dyspnea and fatigue. The diagnosis was made with imaging. In this case report, the authors present a rare case of concurrent surgical complications (pneumothorax, SBO, perforation of the stomach, and hiatal hernia). CASE PRESENTATION: A 62 years-old African American patient who presented with severe sudden onset difficulty breathing two days following laparoscopic toupet fundoplication procedure. She was given oxygen via cannula and the underwent chest tube insertion. She was then transferred to different facility under care of a cardio thoracic surgeon. CLINICAL DISCUSSION: Although SBO is most common emergency following an abdominal procedure, pneumothorax is rarely reported. This case report depicts a unique presentation of pneumothorax secondary to SBO and a discussion section conferring complication risk versus benefits of diverse management modalities (surgical or conservative), and a review of recent literature, further aiding healthcare professionals in the diagnosis and management of patients with SBO complications. CONCLUSION: Review of this case and the literature show a rare presentation of secondary pneumothorax following exploratory laparotomy for SBO. Recognizing the clinical signs and even a small suspicion should prompt one to order imaging. Chest X-ray is inexpensive and can rapidly rule out pneumothorax. These complications have high mortality in patients above the age of 60 years, hence, timely management is of utmost importance.

Solitary Intrascrotal Plexiform Neurofibroma in a 10-Year-Old Male.

Intrascrotal neurofibromas are extensive tumors that grow from peripheral nerves within the scrotum and are exceedingly rare among the benign extratesticular tumors. Though the risk is low, potential for malignancy and patient discomfort make diagnosis and surgical evaluation imperative. Pediatric neurofibromas are typically only associated with neurofibromatosis type 1. However, herein, we describe a rare case of a benign, intrascrotal plexiform neurofibroma in a 10-year-old male who lacks any stigmata associated with this genetic disorder. Diagnostic and surgical challenges as well as histopathological findings are discussed.