The rockefeller university

Despite being a minor component of cells, phosphoinositides are essential for eukaryotic membrane biology, serving as markers of organelle identity and involved in several signaling cascades. Their many functions, combined with alternative synthesis pathways, make in vivo study very difficult. In vitro studies are limited by their inability to fully recapitulate the complexities of membranes in living cells. We engineered the biosynthetic pathway for the most abundant phosphoinositides into the bacterium Escherichia coli, which is naturally devoid of this class of phospholipids. These modified E. coli, when grown in the presence of myo-inositol, incorporate phosphatidylinositol (PI), phosphatidylinositol-4-phosphate (PI4P), phosphatidylinositol-4,5-bisphosphate (PIP2), and phosphatidylinositol-3,4,5-trisphosphate (PIP3) into their plasma membrane. We tested models of biophysical mechanisms with these phosphoinositides in a living membrane, using our system to evaluate the role of PIP2 in nonconventional protein export of human basic fibroblast growth factor 2. We found that PI alone is sufficient for the process.

In daily life, in the operating room and in the laboratory, the operational way to assess wakefulness and consciousness is through responsiveness. A number of studies suggest that the awake, conscious state is not the default behavior of an assembly of neurons, but rather a very special state of activity that has to be actively maintained and curated to support its functional properties. Thus responsiveness is a feature that requires active maintenance, such as a homeostatic mechanism to balance excitation and inhibition. In this work we developed a method for monitoring such maintenance processes, focusing on a specific signature of their behavior derived from the theory of dynamical systems: stability analysis of dynamical modes. When such mechanisms are at work, their modes of activity are at marginal stability, neither damped (stable) nor exponentially growing (unstable) but rather hovering in between. We have previously shown that, conversely, under induction of anesthesia those modes become more stable and thus less responsive, then reversed upon emergence to wakefulness. We take advantage of this effect to build a single-trial classifier which detects whether a subject is awake or unconscious achieving high performance. We show that our approach can be developed into a means for intra-operative monitoring of the depth of anesthesia, an application of fundamental importance to modern clinical practice.

Hidradenitis suppurativa (HS) is a chronic inflammatory disease of the skin, manifesting in chronic, recurrent painful pustules, nodules, boils and purulent draining abscesses. Our current understanding of the pathogenesis of the disease is incomplete. This review aims to identify available treatment options in HS and discuss the pharmacological mechanisms through which such agents function. Identifying common pathways may inform our understanding of the pathogenesis of HS as well as identify future therapeutic targets. The pharmacological mechanisms implicated in topical therapies, antibiotic, hormonal, systemic immunomodulatory and biologic therapies for HS are discussed. Significant differences exist between agents and implicated pathways in therapy for mild and severe disease. This is an expression of the possible dichotomy in inflammatory pathways (and treatment responses) in HS. Studies involving monoclonal antibodies provide the greatest insight into what these specific mechanisms may be. Their variable levels of clinical efficacy compared with placebo bolsters the suggestion that differential inflammatory pathways may be involved in different presentations and severity of disease. Nuclear factor kappa B (NF-kappa B), tumor necrosis factor (TNF)-alpha and other innate immune mechanisms are strongly represented in treatments which are effective in mild to moderate disease in the absence of scarring or draining fistulae, however complex feed-forward mechanisms in severe disease respond to interleukin (IL)-1 inhibition but are less likely to respond to innate immune inhibition (through NF-kappa B or TNF-alpha) alone. It is unclear whether IL-17 inhibition will parallel TNF-alpha or IL-1 inhibition in effect, however it is plausible that small molecule targets (Janus kinase1 and phosphodiesterase 4) may provide effective new strategies for treatment of HS.

PurposeTo investigate the effects of dehydroepiandrosterone (DHEA) supplementation on female sexual function in premenopausal infertile women of advanced ages.MethodsThis observational study was conducted in an academically affiliated private fertility center. Patients included 87 premenopausal infertile women, 50 of whom completed the study including the Female Sexual Function Index (FSFI) questionnaires and comprehensive endocrine evaluation before and 4-8 weeks after initiating 25mg of oral micronized DHEA TID.ResultsAge of patients was 41.14.2 years, BMI 24.4 +/- 6.1kg/m(2), 86% were married, and 42% were parous. Following supplementation with DHEA, all serum androgen levels increased (each P<0.0001), while FSH levels decreased by 2.6 +/- 4.4 from a baseline of 10.3 +/- 5.4mIU/mL (P=0.009). The FSFI score for the whole study group increased by 7% (from 27.2 +/- 6.9 to 29.2 +/- 5.6; P=0.0166). Domain scores for desire increased by 17% (P=0.0004) and by 12% for arousal (P=0.0122); lubrication demonstrated an 8% trend towards improvement (P=0.0551), while no changes in domain scores for orgasm, satisfaction, or pain were observed. Women in the lowest starting FSFI score quartile (<25.7), experienced a 6.1 +/- 8.0 (34%) increase in total FSFI score following DHEA supplementation. Among these women, improvements in domain categories were noted for desire (40%), arousal (46%), lubrication (33%), orgasm (54%), satisfaction (24%), and pain (25%).Conclusions p id=Par4 This uncontrolled observational study implies that supplementation with DHEA improves sexual function in older premenopausal women with low baseline FSFI scores.

Zika virus (ZIKV) targets neural progenitor cells in the brain, attenuates cell proliferation, and leads to cell death. Here, we describe a role for the ZIKV protease NS2B-NS3 heterodimer in mediating neurotoxicity through cleavage of a host protein required for neurogenesis. Similar to ZIKV infection, NS2B-NS3 expression led to cytokinesis defects and cell death in a protease activity-dependent fashion. Among binding partners, NS2B-NS3 cleaved Septin-2, a cytoskeletal factor involved in cytokinesis. Cleavage of Septin-2 occurred at residue 306 and forced expression of a non-cleavable Septin-2 restored cytokinesis, suggesting a direct mechanism of ZIKV-induced neural toxicity.

In recent years, gating and transient ion-pathway formation in the light-gated channelrhodopsins (ChRs) have been intensively studied. Despite these efforts, a profound understanding of the mechanistic details is still lacking. To track structural changes concomitant with the formation and subsequent collapse of the ion-conducting pore, we site-specifically introduced the artificial polarity-sensing probe p-azido-L-phenylalanine (azF) into several ChRs by amber stop codon suppression. The frequently used optogenetic actuator ReaChR (red-activatable ChR) exhibited the best expression properties of the wild type and the azF mutants. By exploiting the unique infrared spectral absorption of azF [nu(as) (N-3) similar to 2100 cm(-1)] and its sensitivity to polarity changes, we monitored hydration changes at various sites of the pore region and the inner gate by stationary and time-resolved infrared spectroscopy. Our data imply that channel closure coincides with a dehydration event occurring between the interface of the central and the inner gate. In contrast, the extracellular ion pathway seems to be hydrated in the open and closed states to similar extents. Mutagenesis of sites in the inner gate suggests that it acts as an intracellular entry funnel, whose architecture and composition modulate water influx and efflux within the channel pore. Our results highlight the potential of genetic code expansion technology combined with biophysical methods to investigate channel gating, particularly hydration dynamics at specific sites, with a so far unprecedented spatial resolution.

In this brief review, the authors present a history of the different aspects of the scientific puzzle leading from pioneer animal studies and astute clinical experimental observations to a mature appreciation of the deleterious role of excess of a type I interferon in human pathology.

Curing HIV infection has been impossible, with the exception of the "Berlin Patient.'' Martinez-Navio et al. (2019) in Miami herein present a rare monkey whose virus was controlled for >3 years after a single genetic intervention that led to persistent production of HIV-neutralizing antibodies in vivo.

In the four decades since the first birth by in-vitro fertilisation (IVF),1 the field has been rewarded with a Nobel prize,2 seen IVF evolve from an experimental procedure into clinical routine, and witnessed a pronounced shift in treatment utilisation from intrauterine inseminations to IVF. However, many studies have shown inferior newborn outcomes with IVF by comparison with spontaneously conceived pregnancies. These observed differences in infant outcomes have been suggested to be a bystander effect, reflective of underlying phenotypes of women who needed IVF to conceive. However, in these previous studies, researchers used random-effects models, focused only on children conceived by IVF, and included children conceived by other fertility treatments in control groups of natural conceptions. These design choices could bias results by underestimating the adverse effects of IVF.