Category Health/Medical

Vaccine Strategy Induces Antibodies that can Target Multiple Influenza Viruses

This is an X-ray crystal structure image of one of the new signature antibodies. The blue ribbons show antibody 16.a.26 Fab regions. The grey ribbons represent HA of influenza strain 1968 Hong Kong. The green spheres are glycans. Credit: NIAID VRC

This is an X-ray crystal structure image of one of the new signature antibodies. The blue ribbons show antibody 16.a.26 Fab regions. The grey ribbons represent HA of influenza strain 1968 Hong Kong. The green spheres are glycans. Credit: NIAID VRC

Scientists have identified 3 types of vaccine-induced antibodies that can neutralize diverse strains of influenza virus that infect humans. It will help guide development of a universal influenza vaccine, according to investigators at the National Institute of Allergy and Infectious Diseases (NIAID), and the National Human Genome Research Institute (NHGRI), both part of the National Institutes of Health (NIH), and collaborators who conducted the research.

The seasonal influenza vaccine must be updated each year because flu viruses mutate...

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Plant Compounds give 1,2 Punch to Colon Cancer

Increased apoptosis was induced by curcumin + silymarin combination treatment of DLD-1 colon cancer cells.

Increased apoptosis was induced by curcumin + silymarin combination treatment of DLD-1 colon cancer cells.

The combination of 2 plant compounds that have medicinal properties – curcumin and silymarin – holds promise in treating colon cancer, according Saint Louis University research published in the June 23 issue of the Journal of Cancer. Curcumin is the active ingredient in the spice turmeric, which is present in spicy curry dishes, and silymarin is a component of milk thistle, which has been used to treat liver disease.

The researchers and their students studied a line of colon cancer cells in a laboratory model. They found treating the cells initially with curcumin, then with silymarin was more effective in fighting cancer than treating the cells with either phytochemical alone.

“The co...

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Gastrointestinal Disorders involve both Brain-to-Gut and Gut-to-Brain Pathways

The biopsychosocial model of Irritable Bowel Syndrome.

The biopsychosocial model of Irritable Bowel Syndrome.

New research indicates that in patients with irritable bowel syndrome (IBS) or indigestion, there is a distinct brain-to-gut pathway, where psychological symptoms begin first, and separately a distinct gut-to-brain pathway, where gut symptoms start first. In the study, higher levels of anxiety and depression were significant predictors of developing IBS or indigestion within 1 year. People who did not have elevated levels of anxiety and depression at the start of the study but had documented IBS or indigestion reported significantly higher levels of anxiety and depression after 1 year.

The researchers calculated that in one-third of individuals, a mood disorder precedes gastrointestinal disorder, but in two-thirds a gastrointestinal di...

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Genes find their Partners without Matchmakers

Schematic of the looped dsDNA unfolding experiments for the case of (a) no pairing and (b) complete pairing. The construct is built from 50 kb λ-phage dsDNA ligated at the end to a 10 kb homologous fragment (for details see the main text). Here, the red lines represent the part of dsDNA which is not identical in sequence to the 10 kb fragment. The two 10 kb sequences which are identical to each other are shown in green to yellow shading to indicate which way the two sequences run (the yellow indicating the end sequence of the λ-phage DNA). When the constructs are fully extended the two homologous pieces run in opposite directions, but when folded any paired tracts will run in the same direction. Shown in (b) is a coil–expected form for the DNA – where the magnification shows that, where pairing occurs, two sections may align so that their identical sequences read in the same direction. (c) Is a representative result showing the extension versus force curves (decreasing force only) in 150 mM NaCl–PBS at 25°C for a dsDNA construct (solid) and a control curve for a 60 kb dsDNA in the same ionic conditions (dashed). The y-axis is normalized to L19, the measured extension of the controls at 19 pN. Further experimental data curves for different ionic conditions are given in the electronic supplementary material, S1. (d) The solid line shows the difference between the two curves (here, defined as the extension of the construct minus the experimentally measured control) shown in (c), multiplied by L19, resulting in negative values since the extension of the paired dsDNA is shorter than the 60 kb control. The dotted line shows the standard deviation for 25 controls. At forces less than 2 pN, the constructs containing homologous regions show significant variation, but even at 5 pN the difference between the constructs and controls is more than 10 times the standard deviation in the controls. The results indicate a significant interaction between identical DNA tracts, which affects the extension–force curve even when the applied force exceeds 10 pN. Experiments for higher temperatures (37°C and 40°C) have also been performed that are not shown here; they demonstrate qualitatively similar effect of ‘homology recognition’; the data for these temperatures are treated in the electronic supplementary material, S5. (Online version in colour.)

Schematic of the looped dsDNA unfolding experiments for the case of (a) no pairing and (b) complete pairing. The construct is built from 50 kb λ-phage dsDNA ligated at the end to a 10 kb homologous fragment (for details see the main text). Here, the red lines represent the part of dsDNA which is not identical in sequence to the 10 kb fragment. The two 10 kb sequences which are identical to each other are shown in green to yellow shading to indicate which way the two sequences run (the yellow indicating the end sequence of the λ-phage DNA). When the constructs are fully extended the two homologous pieces run in opposite directions, but when folded any paired tracts will run in the same direction...

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