Canonical and non-canonical NF-κB signaling promotes breast cancer tumor-initiating cells.

Tumor-initiating cells (TICs) are a sub-population of cells that exhibit a robust ability to self-renew and contribute to the formation of primary tumors, the relapse of previously treated tumors and the development of metastases. TICs have been identified in various tumors including those of the breast, and are particularly enriched in the basal-like and claudin-low subtypes of breast cancer. The signaling pathways that contribute to the function and maintenance of TICs are under intense study. We explored the potential involvement of the nuclear factor-κB (NF-κB) family of transcription factors in TICs in cell lines that are representative of basal-like and claudin-low breast cancer. NF-κB was found to be activated in breast cancer cells that form tumorspheres efficiently. Moreover, both canonical and non-canonical NF-κB signaling is required for these cells to self-renew in vitro and to form xenograft tumors efficiently in vivo using limiting dilutions of cells. Consistent with this fact, canonical and non-canonical NF-κB signaling is activated in TICs isolated from breast cancer cell lines. Experimental results indicate that NF-κB promotes the function of TICs by stimulating epithelial-to-mesenchymal transition and by upregulating the expression of the inflammatory cytokines interleukin-1ß and interleukin-6. The results suggest the use of NF-κB inhibitors for clinical therapy of certain breast cancers.

An investigation of the uroselective properties of four novel alpha(1a)-adrenergic receptor subtype-selective antagonists.

The development of alpha(1a)-adrenergic receptor (AR) subtype-selective antagonists is likely to result in uroselective agents that effectively treat benign prostatic hyperplasia (BPH) symptoms without causing undesirable side effects that may be due to vascular alpha(1)-AR blockade. The properties of four aryl piperazine compounds (RWJ-38063, RWJ-68141, RWJ-68157, and RWJ-69736) are described in this report and compared with the properties of tamsulosin, an alpha(1)-AR antagonist that is used in the treatment of BPH. Radioligand binding studies show that all four RWJ compounds have significantly higher affinity for the alpha(1a)-AR subtype than for the alpha(1b) or alpha(1d) subtype and display a higher level of receptor subtype selectivity than tamsulosin. The RWJ compounds were more potent in inhibiting (+/-)-norepinephrine-induced contractions of isolated rat prostate tissue than those of isolated rat aorta tissue, whereas tamsulosin had the reversed tissue selectivity. RWJ-38063 and RWJ-69736 had the highest potency in the isolated prostate tissue assays of the four RWJ compounds, with pK(B) values of 8.24 and 9.26, respectively, and were 319- and 100-fold more potent in their effects on isolated prostate tissue than aorta tissue. The in vivo uroselectivities of RWJ-38063, RWJ-69736, and tamsulosin were examined in anesthetized dogs. Both RWJ compounds suppressed the intraurethral pressure response to phenylephrine to a greater extent than the mean arterial pressure response; however, RWJ-69736 also caused a marked transient rise in heart rate. Although less potent, RWJ-38063 and RWJ-69736 were notably more uroselective than tamsulosin in this canine model.

Cloning and functional expression of a voltage-gated calcium channel alpha1 subunit from jellyfish.

Voltage-gated Ca2+ channels in vertebrates comprise at least seven molecular subtypes, each of which produces a current with distinct kinetics and pharmacology. Although several invertebrate Ca2+ channel alpha1 subunits have also been cloned, their functional characteristics remain unclear, as heterologous expression of a full-length invertebrate channel has not previously been reported. We have cloned a cDNA encoding the alpha1 subunit of a voltage-gated Ca2+ channel from the scyphozoan jellyfish Cyanea capillata, one of the earliest existing organisms to possess neural and muscle tissue. The deduced amino acid sequence of this subunit, named CyCaalpha1, is more similar to vertebrate L-type channels (alpha1S, alpha1C, and alpha1D) than to non-L-type channels (alpha1A, alpha1B, and alpha1E) or low voltage-activated channels (alpha1G). Expression of CyCaalpha1 in Xenopus oocytes produces a high voltage-activated Ca2+ current that, unlike vertebrate L-type currents, is only weakly sensitive to 1,4-dihydropyridine or phenylalkylamine Ca2+ channel blockers and is not potentiated by the agonist S(-)-BayK 8644. In addition, the channel is less permeable to Ba2+ than to Ca2+ and is more permeable to Sr2+. CyCaalpha1 thus represents an ancestral L-type alpha1 subunit with significant functional differences from mammalian L-type channels.

Occurrence of 13(S)-hydroxyoctadecadienoic acid in biological samples.

The oxygenated metabolite of linoleic acid, 13(S)-hydroxyoctadecadienoic acid has recently been shown to play a role in cellular regulation. To detect this molecule in biological systems, we recently developed a specific polyclonal antibody. Using this antibody, we report the presence of 13(S)-hydroxyoctadecadienoic acid in human urine, cell culture media, and untreated goat serum for the first time by a specific, sensitive, and rapid enzyme immunoassay. Furthermore, the enzyme linked immunosorbent assay data are verified by gas chromatography/mass spectrometry analysis of the same samples.

Significance and immunoassay of 9- and 13-hydroxyoctadecadienoic acids.

Linoleic acid, the predominant polyunsaturated fatty acid in the diet, can be metabolized by cyclooxygenase, lipoxygenase and P450 enzymes. The monohydroxy lipoxygenation products of linoleic acid, 9- and 13-hydroxyoctadecadienoic acids (9(S)- and 13(S)-HODEs), are the most widely distributed of the known linoleic acid metabolites. These compounds exhibit interesting biological activities, including regulation of platelet function, maintenance of vascular thromboresistance and transduction of the cellular responses to certain growth factors. In view of their biological significance, we have produced polyclonal antibodies for the first time to these bioactive lipids to develop an easy, inexpensive, sensitive, specific and rapid enzyme immunoassay method for these bioactive lipids.

Hospital pension money deserves proper strategy.

The financial viability of the hospital's pension plan depends, in large part, upon the ability of its managers to invest and supervise the money. Mismanagement of funds can lead to diminished available funds and have devastating effects on the hospital's reserves. The following article looks at combatting fund mismanagement by hiring a professional financial manager.

Uterine adnexal torsion: a case report.

Uterine adnexal torsion is a surgical condition that requires prompt diagnosis and intervention. An ultrasound examination demonstrating a unilaterally enlarged, hypoechoic ovary with several small spherical, peripherally located sonolucent structures in the involved ovary, in addition to a history and physical consistent with torsion, confirms the need for surgical intervention. In this article, we present a case of uterine adnexal torsion and discuss the etiologic, diagnostic and therapeutic aspects of this entity.