To interpret HRQoL data precisely, knowledge of the content, scor

To interpret HRQoL data precisely, knowledge of the content, scoring, reliability, and validity of a questionnaire is important. Recently, there is a growing interest in the assessment of HRQoL in the field of hemophilia; results are presented for pediatric and adult hemophilia patients. “
“Summary.  Pregnancy, labour and delivery present intrinsic haemostatic challenges to women with and carriers of bleeding disorders

and their offspring. Deficiency of fibrinogen and factor XIII are associated with miscarriage, placental abruption and foetal loss. The risk of antenatal complications including antepartum haemorrhage APO866 clinical trial is unknown in women with other bleeding disorders. There is a significant risk of postpartum haemorrhage (primary and secondary) in women with all types of bleeding disorders. This can be serious and life threatening in those with severe defects such as Bernard Soulier syndrome and Glanzmann’s thrombasthenia. Three to four percent of infants with haemophilia experience cranial bleeding that occurs during labour and delivery.

The safest method of delivery for affected babies remains controversial. However, the rate of planned Caesarean section is increasing among known carriers of haemophilia. If vaginal delivery is planned, prolonged labour and difficult delivery especially vacuum extraction are associated with the highest risk of cranial bleeding and should be avoided. The optimal management selleckchem of pregnancy in women with inherited bleeding disorders requires a multidisciplinary approach and advanced individualized management plan taking Akt inhibitor into consideration obstetric and bleeding risk factors. Women with mild or moderate bleeding disorders can be managed at their local maternity unit in close collaboration

with a tertiary centre. However, those with severe or rare disorders or carrying an affected infant should be managed in a tertiary centre with an onsite Haemophilia centre. “
“Summary.  Factor replacement with BIOSTATE®, a factor VIII (FVIII)/von Willebrand factor concentrate, forms the mainstay of treatment for children with von Willebrand disorder (VWD) in Australia and New Zealand. However, published data on the clinical efficacy and safety of BIOSTATE in the VWD paediatric population are limited. We retrospectively assessed the efficacy and safety of BIOSTATE in 43 children with VWD who received treatment for surgery, non-surgical bleeds or continuous prophylaxis at eight paediatric haemophilia centres in Australia and New Zealand. Data were collected on patient demographics, disease history, treatment history, dosage, administration, adverse reactions, concomitant medications and excessive bleeding events. BIOSTATE provided excellent/good haemostatic efficacy in 90% of surgical procedures (n = 42) with a mean daily FVIII dose of 47 IU FVIII:C kg−1 and a median treatment duration of 3 days.

e, compensatory mechanisms) to perform the procedural task “

e., compensatory mechanisms) to perform the procedural task. “
“This study examined the longer-term effects of traumatic brain injury (TBI) on theory of mind (ToM) skills of children who were between the ages of 5 and 7 years at the Sorafenib research buy time of injury. Fifty-two children with orthopaedic injury, 30 children with moderate TBI, and 12 children with severe TBI were evaluated approximately 1 year post-injury (mean age=6.98 years, SD=0.59, range=6.02–8.26). Children with severe TBI did not engage

in representation of first- and second-order mental states at a developmental level comparable to their peers, suggesting stagnation or lack of development, as well as regression of putatively existing ToM skills. Age, task-specific cognitive demands, and verbal abilities were strong predictors of ToM performance. However, even after taking those factors into account, children with severe TBI had poorer ToM performance than children with orthopaedic injuries. “
“Previous studies have shown that acquired prosopagnosia is characterized by impairment at holistic/configural processing. However, this view is essentially supported by studies performed with patients whose face recognition difficulties are part of a more general visual (integrative) agnosia. Here, we tested the patient PS, a case of acquired prosopagnosia whose face-specific recognition

difficulties Rapamycin in vivo have been related to the inability to process individual faces holistically (absence of inversion, composite, and whole–part effects with faces). Here, we show that in contrast to this impairment, the patient presents with an entirely normal response profile in a Navon hierarchical letter task: she was as fast as normal controls, faster to identify global than local letters, and her sensitivity to global interference during identification of local letters was at least as large as normal observers. These observations indicate that holistic processing as measured with global/local interference in the Navon paradigm is functionally distinct from the ability to perceive find more an individual face holistically. “
“This study examined the effects of traumatic

brain injury (TBI) on Wechsler Memory Scale-III (WMS-III) performance. Since poor effort potentially contaminates results, effort was explicitly assessed and controlled using two well-validated cognitive validity indicators, the Portland Digit Recognition Test (PDRT) and Reliable Digit Span (RDS). Participants were 44 mild TBI patients with good effort, 48 mild TBI patients with poor effort, and 40 moderate–severe TBI patients with good effort. A dose–response relationship between injury severity and WMS-III performance was demonstrated. Effect size calculations showed that the good effort mild TBI patients did not differ from normal (average Cohen’s d= 0.07) while moderate–severe TBI had a moderate effect on WMS-III scores (average Cohen’s d=−0.52).

e, compensatory mechanisms) to perform the procedural task “

e., compensatory mechanisms) to perform the procedural task. “
“This study examined the longer-term effects of traumatic brain injury (TBI) on theory of mind (ToM) skills of children who were between the ages of 5 and 7 years at the HSP inhibitor cancer time of injury. Fifty-two children with orthopaedic injury, 30 children with moderate TBI, and 12 children with severe TBI were evaluated approximately 1 year post-injury (mean age=6.98 years, SD=0.59, range=6.02–8.26). Children with severe TBI did not engage

in representation of first- and second-order mental states at a developmental level comparable to their peers, suggesting stagnation or lack of development, as well as regression of putatively existing ToM skills. Age, task-specific cognitive demands, and verbal abilities were strong predictors of ToM performance. However, even after taking those factors into account, children with severe TBI had poorer ToM performance than children with orthopaedic injuries. “
“Previous studies have shown that acquired prosopagnosia is characterized by impairment at holistic/configural processing. However, this view is essentially supported by studies performed with patients whose face recognition difficulties are part of a more general visual (integrative) agnosia. Here, we tested the patient PS, a case of acquired prosopagnosia whose face-specific recognition

difficulties GSK-3 phosphorylation have been related to the inability to process individual faces holistically (absence of inversion, composite, and whole–part effects with faces). Here, we show that in contrast to this impairment, the patient presents with an entirely normal response profile in a Navon hierarchical letter task: she was as fast as normal controls, faster to identify global than local letters, and her sensitivity to global interference during identification of local letters was at least as large as normal observers. These observations indicate that holistic processing as measured with global/local interference in the Navon paradigm is functionally distinct from the ability to perceive find more an individual face holistically. “
“This study examined the effects of traumatic

brain injury (TBI) on Wechsler Memory Scale-III (WMS-III) performance. Since poor effort potentially contaminates results, effort was explicitly assessed and controlled using two well-validated cognitive validity indicators, the Portland Digit Recognition Test (PDRT) and Reliable Digit Span (RDS). Participants were 44 mild TBI patients with good effort, 48 mild TBI patients with poor effort, and 40 moderate–severe TBI patients with good effort. A dose–response relationship between injury severity and WMS-III performance was demonstrated. Effect size calculations showed that the good effort mild TBI patients did not differ from normal (average Cohen’s d= 0.07) while moderate–severe TBI had a moderate effect on WMS-III scores (average Cohen’s d=−0.52).

Thus, the observed increase of Th17 cells in our CHB patients may

Thus, the observed increase of Th17 cells in our CHB patients may represent an HBV nonspecific phenomenon. Taken together, these results indicate that Th17 cells are closely associated with the superimposed liver damage induced by HBV infection. The precise mechanism of Th17 cells inducing liver damage in CHB patients remains unknown. The present study found Fer-1 in vitro that IL-17R was uniquely expressed on peripheral monocytes and mDCs in CHB patients. In addition, IL-17 in vitro can activate mDCs and monocytes and enhance their capacity to produce proinflammatory cytokines in a dose-dependent pattern. These proinflammatory cytokines

are critical for liver damage during hepatitis B progression.2 Indeed, our previous studies indicate that multiple immune cells, including mDCs, plasmacytoid DCs, and FoxP3-positive regulatory

T cells, can infiltrate the liver and actively participate in the immune-pathogenesis in mild and severe CHB patients.10–12 Thus, IL-17 can directly function on these IL-17R–expressing cells and exacerbate the inflammatory microenvironment of the liver. Notably, both mDCs and monocytes from CHB patients displayed lower levels of IL-17R expression and poorer responsiveness to IL-17 in vitro relative to those of HC subjects. This phenomenon can be explained by the negative feedback effects of high levels of IL-17 on the IL-17R–expressing cells because MK2206 IL-17 can significantly down-regulate IL-17R expression on these mDCs and monocytes (Supporting Fig. 3). Future studies should investigate the factors underlying the low responsiveness of mDCs and monocytes to IL-17 stimulation in vitro in CHB patients. Notably, a recent study indicated that hepatic stellate cells can also express

IL-17R; following IL-17 stimulation in vitro they can secret IL-8 and GRO-α and subsequently recruit neutrophils into the livers of patients with alcoholic liver disease.15 Therefore, it is necessary to understand whether IL-17 protein secreted by liver-infiltrating Th17 cells of CHB patients also enhances this chemokine production by liver parenchymal cells, which further recruit immune cells into the livers of CHB patients. Furthermore, we found that peripheral Th17 cells from CHB find more patients have little capacity to produce IL-22, a cytokine which has been shown to protect against T-cell hepatitis.32, 33 This loss of Th17-producing IL-22 might also exacerbate liver injury in CHB patients. Future studies should investigate whether these Th17 cells are inherently defective, or whether the CHB patients are simply lacking a cofactor for IL-22 production. Taken together, these data emphasize that liver Th17 cells may reinforce the pathogenic inflammatory microenvironment in the livers of CHB patients.

Thus, the observed increase of Th17 cells in our CHB patients may

Thus, the observed increase of Th17 cells in our CHB patients may represent an HBV nonspecific phenomenon. Taken together, these results indicate that Th17 cells are closely associated with the superimposed liver damage induced by HBV infection. The precise mechanism of Th17 cells inducing liver damage in CHB patients remains unknown. The present study found www.selleckchem.com/products/Maraviroc.html that IL-17R was uniquely expressed on peripheral monocytes and mDCs in CHB patients. In addition, IL-17 in vitro can activate mDCs and monocytes and enhance their capacity to produce proinflammatory cytokines in a dose-dependent pattern. These proinflammatory cytokines

are critical for liver damage during hepatitis B progression.2 Indeed, our previous studies indicate that multiple immune cells, including mDCs, plasmacytoid DCs, and FoxP3-positive regulatory

T cells, can infiltrate the liver and actively participate in the immune-pathogenesis in mild and severe CHB patients.10–12 Thus, IL-17 can directly function on these IL-17R–expressing cells and exacerbate the inflammatory microenvironment of the liver. Notably, both mDCs and monocytes from CHB patients displayed lower levels of IL-17R expression and poorer responsiveness to IL-17 in vitro relative to those of HC subjects. This phenomenon can be explained by the negative feedback effects of high levels of IL-17 on the IL-17R–expressing cells because see more IL-17 can significantly down-regulate IL-17R expression on these mDCs and monocytes (Supporting Fig. 3). Future studies should investigate the factors underlying the low responsiveness of mDCs and monocytes to IL-17 stimulation in vitro in CHB patients. Notably, a recent study indicated that hepatic stellate cells can also express

IL-17R; following IL-17 stimulation in vitro they can secret IL-8 and GRO-α and subsequently recruit neutrophils into the livers of patients with alcoholic liver disease.15 Therefore, it is necessary to understand whether IL-17 protein secreted by liver-infiltrating Th17 cells of CHB patients also enhances this chemokine production by liver parenchymal cells, which further recruit immune cells into the livers of CHB patients. Furthermore, we found that peripheral Th17 cells from CHB find more patients have little capacity to produce IL-22, a cytokine which has been shown to protect against T-cell hepatitis.32, 33 This loss of Th17-producing IL-22 might also exacerbate liver injury in CHB patients. Future studies should investigate whether these Th17 cells are inherently defective, or whether the CHB patients are simply lacking a cofactor for IL-22 production. Taken together, these data emphasize that liver Th17 cells may reinforce the pathogenic inflammatory microenvironment in the livers of CHB patients.

Western blot analysis and cell cycle regulation were performed to

Western blot analysis and cell cycle regulation were performed to determine the involvement of various mediators of apoptosis. Results:  Metformin specifically inhibited the growth of HCC cells without affecting the growth of normal liver cells both

in vitro and in vivo. Metformin caused cell cycle arrest in HCC cells, which resulted in caspase-3 activation. Livin levels decreased in a dose-dependent manner upon metformin treatment. Metformin activated 5′-adenosine monophosphate-activated protein kinase, inhibited the mammalian target of rapamycin pathway and downregulated Livin protein expression. Conclusion:  Our findings indicate that metformin is effective at initiating apoptosis and inhibiting key survival signaling selleck chemicals llc pathways in HCC cells. These data provide a foundation for further studies to evaluate metformin in the

clinic either as a single agent or in combination with other first-line agents as a treatment option for HCC. “
“The clinical significance and prognosis of mixed adenocarcinoma in early gastric cancer (EGC) are incompletely understood. The aim of this study was to evaluate the clinicopathological characteristics and long-term outcomes of mixed adenocarcinoma diagnosed as EGC after endoscopic submucosal dissection (ESD). Four hundred and thirty EGCs were histologically proven by ESD in 395 patients. The clinicopathological characteristics and long-term outcomes, including the rates of local recurrence, were evaluated according to histological type in EGC treated

with ESD. In total, 430 EGCs were classified Antiinfection Compound Library chemical structure as 362 (84.4%) tubular adenocarcinomas, 41 (9.5%) poorly cohesive carcinomas (PCCs), 26 (6.0%) mixed adenocarcinomas, and 1 (0.2%) papillary adenocarcinoma according to the WHO classification. Although the en bloc resection rate was acceptable (92.3%) for mixed adenocarcinoma, the complete selleck products resection rate was lower (53.8%) than that in other types (P < 0.01). Local recurrence occurred in 5 (19.2%) of 26 mixed adenocarcinomas after ESD. In a multivariate analysis, mixed adenocarcinoma was an independent risk factor predicting local recurrence after ESD for EGC (hazard ratio, 7.039; P < 0.01). Mixed adenocarcinoma is more aggressive than other histological types of EGC based on clinical outcomes. Moreover, it is an independent prognostic factor for local recurrence after ESD for EGC. "
“Tegobuvir (GS-9190), a non-nucleoside nonstructural protein (NS)5B polymerase inhibitor, and GS-9256, an NS3 serine protease inhibitor, individually have activity against hepatitis C virus (HCV) genotype 1. The antiviral activity of tegobuvir and GS-9256 as oral combination therapy, or together with ribavirin (RBV) or pegylated interferon (Peg-IFN) alpha-2a and RBV, was assessed in a phase II, randomized, open-label trial.

Overall survival is significantly better in the era of the stool

Overall survival is significantly better in the era of the stool card screening program. Dorsomorphin chemical structure Other studies show that the better the results of the Kasai operation, the better the overall survival.16, 18 Although more developed transplantation techniques in the stool card screening era partly contribute to survival, the need for liver transplantation still adds the risk to impair the prognosis. Successful Kasai operation still provides patients with the best chance of survival, and every effort should be made to improve its results.16

The stool card screening program is a step in this direction, because it efficiently increases the success rate of Kasai operation and contributes to better overall survival. The 5-year survival rate with native liver and 5-year overall survival rate in other studies range from 30.1% to 59.7% and from 75.5% to 85%, respectively.13, 19, 20 In Taiwan, these rates are 64.3% and 89.3%, respectively (Table 1). This corroborates the promising results of intervention using the stool card screening program. In conclusion, the stool card screening program for BA enhances early Kasai operation and increases the jaundice-free rate at 3 months postsurgery, which is a valuable predictor of 5-year outcome. In Taiwan, the infant stool selleckchem color card screening program has markedly improved the

5-year outcome of BA patients. We appreciate the valuable contribution of the members of the Taiwan Infant Stool Color Card Study Group and thank Li-Chin Fan, Cheng-Hui Hsiao, Yu-Ru Tseng, and Szu-Ta Chen for assistance in preparing this article. Additional Supporting Information may be found in the online version of this article. “
“Acute hepatitis C continues to be a concern in men who have sex with men (MSM), and its optimal management has yet to be established. In this study, the clinical, biological, and therapeutic data of 53 human immunodeficiency virus (HIV)-infected MSM included in a multicenter prospective study on acute hepatitis C in 2006-2007 were retrospectively collected

and analyzed. The mean hepatitis C virus (HCV) viral load at diagnosis was selleck 5.8 ± 1.1 log10 IU/mL (genotype 4, n = 28; genotype 1, n = 14, genotype 3, n = 7). The cumulative rates of spontaneous HCV clearance were 11.0% and 16.5% 3 and 6 months after diagnosis, respectively. Forty patients were treated, 38 of whom received pegylated interferon and ribavirin. The mean duration of HCV therapy was 39 ± 17 weeks (24 ± 4 weeks in 14 cases). On treatment, 18/36 (50.0%; 95% confidence interval 34.3-65.7) patients had undetectable HCV RNA at week 4 (RVR), and 32/39 (82.1%; 95 confidence interval 70.0-94.1) achieved sustained virological response (SVR). SVR did not correlate with pretreatment parameters, including HCV genotype, but correlated with RVR (predictive positive value of 94.

Overall survival is significantly better in the era of the stool

Overall survival is significantly better in the era of the stool card screening program. selleck screening library Other studies show that the better the results of the Kasai operation, the better the overall survival.16, 18 Although more developed transplantation techniques in the stool card screening era partly contribute to survival, the need for liver transplantation still adds the risk to impair the prognosis. Successful Kasai operation still provides patients with the best chance of survival, and every effort should be made to improve its results.16

The stool card screening program is a step in this direction, because it efficiently increases the success rate of Kasai operation and contributes to better overall survival. The 5-year survival rate with native liver and 5-year overall survival rate in other studies range from 30.1% to 59.7% and from 75.5% to 85%, respectively.13, 19, 20 In Taiwan, these rates are 64.3% and 89.3%, respectively (Table 1). This corroborates the promising results of intervention using the stool card screening program. In conclusion, the stool card screening program for BA enhances early Kasai operation and increases the jaundice-free rate at 3 months postsurgery, which is a valuable predictor of 5-year outcome. In Taiwan, the infant stool selleck kinase inhibitor color card screening program has markedly improved the

5-year outcome of BA patients. We appreciate the valuable contribution of the members of the Taiwan Infant Stool Color Card Study Group and thank Li-Chin Fan, Cheng-Hui Hsiao, Yu-Ru Tseng, and Szu-Ta Chen for assistance in preparing this article. Additional Supporting Information may be found in the online version of this article. “
“Acute hepatitis C continues to be a concern in men who have sex with men (MSM), and its optimal management has yet to be established. In this study, the clinical, biological, and therapeutic data of 53 human immunodeficiency virus (HIV)-infected MSM included in a multicenter prospective study on acute hepatitis C in 2006-2007 were retrospectively collected

and analyzed. The mean hepatitis C virus (HCV) viral load at diagnosis was learn more 5.8 ± 1.1 log10 IU/mL (genotype 4, n = 28; genotype 1, n = 14, genotype 3, n = 7). The cumulative rates of spontaneous HCV clearance were 11.0% and 16.5% 3 and 6 months after diagnosis, respectively. Forty patients were treated, 38 of whom received pegylated interferon and ribavirin. The mean duration of HCV therapy was 39 ± 17 weeks (24 ± 4 weeks in 14 cases). On treatment, 18/36 (50.0%; 95% confidence interval 34.3-65.7) patients had undetectable HCV RNA at week 4 (RVR), and 32/39 (82.1%; 95 confidence interval 70.0-94.1) achieved sustained virological response (SVR). SVR did not correlate with pretreatment parameters, including HCV genotype, but correlated with RVR (predictive positive value of 94.

Results: The proliferation rate was significantly higher in the l

Results: The proliferation rate was significantly higher in the livers at one week of age compared to controls (22% vs 17%, respectively; P=0.01). Studies on these livers using Sox9 and Ki67 have excluded the Sox9 progenitor

compartment as the source of proliferation. Rather proliferation rates for both Sox9 progenitors and hepato-cytes were lower in the mutants compared to controls (10% vs 19% and 33% vs 46%, respectively). However, we identified a significant increase in single Selleck Lenvatinib Sox9+ progenitor numbers in the one-week old Jag1+/−Rfng+/− livers when comparing them to age-matched controls (Ave =145 vs 37; P=0.0001). Co-localization studies have identified a significant increase in Hnf4α+/Sox9+ as well (Ave =65 vs 26; P=0.05), but a significant reduction in the number of CK+/Sox9+ population (Avg =178 vs 359; P=0.0004). Conclusions:

We identified a proliferation rate increase in the one-week old Jag1+/−Rfng+/−mutants and determined that neither the Sox9 progenitor compartment nor the hepatocytes were proliferating. However, due to their significant increases in overall numbers, we concluded that these compartments are aberrantly differentiating toward both cholangiocytes and hepatocytes. The reduced number of CK+/Sox9+ cells at the same time point also supports a delay in maturation of biliary cells as CK19 is a marker of the mature cholangiocyte. This work further substantiates recent findings whereby Sox9 progenitors differentiate along both GSK126 the cholangiocyte and hepatocyte lineages. Disclosures: The following people have nothing to disclose: learn more Lara A. Underkoffler, Emily K. McComb, John Dutton, Anthony Nelson, Kathleen M. Loomes, Matthew J. Ryan

Objective: Pediatric Acute Liver Failure (PALF) is a rapidly evolving clinical condition. Tools to reliably predict spontaneous survival (S) and non-survival (NS), to assess biomarkers of disease severity and trajectory, and to inform liver transplantation (LTx) decisions are not available. We hypothesized that key inflammatory interactions as well as subgroup-specific dynamic patterns using data-driven computational modeling of protein-level expression of inflammatory mediators in serum may serve as tools for predicting outcomes. Methods: During the 7 days following enrollment in the PALF study, serum samples from 140 children were collected and assayed for 27 inflammatory mediators. Outcomes (S [n=80], NS [n=18], and LTx [n=42]) were assessed within 21 days. Data were analyzed using Two-Way ANOVA, time-interval Principal Component Analysis (PCA), and Dynamic Network Analysis (DyNA). Results: Two-Way ANOVA revealed multiple inflammatory mediators that changed significantly and separated patient groups: MCP-1 and most interleukins differentiated S and LTx from NS; Eotaxin, MIG and IL-17 segregated LTx from S and NS; and sIL-2Rβ and IP-10 differentiated S from LTx.

Several minutes later, the same cell assembled additional hot spo

Several minutes later, the same cell assembled additional hot spots at different locations

along the cell base that also generated many vesicles and then disappeared (images not shown). Many of these dynamin-associated vesicles were seen translocating in a linear path, as if along learn more cytoskeletal filaments. This observation suggests that dynamin may remain on the motile vesicle, rather than immediately dissociating as predicted.13 We counted the number of vesicles generated during a typical hot spot lifetime (10-15 minutes) and observed an average steady state release of 4-6 vesicles/min (4 cells counted). Most remarkable is that each hot spot undergoes a 2 to 3-minute burst that generates 15-20 vesicles per minute during which the structure physically “dissolves.” This is exceptionally rapid

when compared with the release of multiple vesicles from conventional clathrin pits (1-2 vesicles/min).20 The rapid vesicle formation from Dyn2/clathrin/AP2 hot spots suggests that these are endocytic structures that are either continuous with the PM or reside as an internal endocytic sorting compartment. Because the HRP marker used to label hot spots by EM (Fig. 1C) was internalized by cells over a 45-minute time period, it is possible that the endocytic hot spots, while in intimate proximity with the PM, represent internal endocytic sorting compartments. To test if these endocytic structures are distinct from or continuous with the PM, we utilized Ruthenium red (RR), an electron-dense dye, to label the cell surface and

any invaginations Saracatinib continuous with the external environment. Because the dye is included in the primary fixative, thereby preventing its internalization, membrane compartments stained with the dye represent extensions of the PM. As expected, cells stained with RR, processed for EM, and sectioned transverse to the substrate showed very dark apical and basal PMs, whereas internal membrane this website systems were only lightly stained (Fig. 4A,B). In control cells (Fig. 4A), small patches of dark, tubular invaginations were observed extending from the basal, but not the apical, PM. These structures were nearly identical in dimensions to those observed in the HRP-labeled cells that were sectioned en face (Fig. 1) and appear as a “side view” of the endocytic hot spots shown in the previous figures. Most important, these endocytic structures were darkly stained with the RR dye, indicating that they are continuous invaginations of the PM. Because GFP-tagged Dyn2 associates with the endocytic hot spots (Figs. 1-3), we predicted that disruption of Dyn2 function would alter the number and complexity of the RR-positive PM invaginations. To test this hypothesis, cultured cells were microinjected with one of two purified polyclonal antibodies that we have used in previous studies to inhibit dynamin function.