PhD student Fiona Sach has had her first paper accepted for publication in Peer Journal. This review article describes how nutritional requirements of African elephants may govern movement choices and lead to human-elephant conflict.
Sach F, Dierenfeld ES, Langley-Evans SC, Watts MJ, Yon L (2019). African savanna elephants (Loxodonta africana) as an example of a herbivore making movement choices based on nutritional need. Peer Journal In Press
Happy to report a nice Christmas present, especially for PhD student Sally Draycott, whose first paper has been accepted by Nutrition and Metabolism today.
Maternal dietary ratio of linoleic acid to alpha-linolenic acid during pregnancy has sex specific effects on placental and fetal weights in the rat.
By Sally Draycott, Ge Liu, Zoe Daniel, Matt Elmes, Bev Muhlhausler and Simon Langley-Evans.
Background: Increased consumption of linoleic acid (LA, omega-6) in Western diets coupled with the pro-inflammatory and adipogenic properties of its derivatives has led to suggestions that fetal exposure to this dietary pattern could be contributing to the intergenerational cycle of obesity.
Method: This study aimed to evaluate the effects of maternal consumption of a LA to alpha-linolenic acid (ALA) ratio similar to modern Western diets (9:1) compared to a lower ratio (1:1.5) on placental and fetal growth, and to determine any cumulative effects by feeding both diets at two total fat levels (18% vs 36% fat w/w). Female Wistar rats (n=5-7/group) were assigned to one of the four experimental diets prior to mating until 20d of gestation.
Results: Fatty acid profiles of maternal and fetal blood and placental tissue at 20d gestation were different between dietary groups, and largely reflected dietary fatty acid composition. Female fetuses were heavier (2.98±0.06g vs 3.36±0.07g, P<0.01) and male placental weight was increased (0.51±0.02g vs 0.58±0.02, P<0.05) in the low LA:ALA groups. Female fetuses of dams exposed to a 36% fat diet had a reduced relative liver weight irrespective of LA:ALA ratio (7.61±0.22% vs 6.93±0.19%, P<0.05). These effects occurred in the absence of any effect of the dietary treatments on maternal bodyweight, fat deposition or expression of key lipogenic genes in maternal and fetal liver or maternal adipose tissue.
Conclusion: These findings suggest that both the total fat content as well as the LA:ALA ratio of the maternal diet have sex-specific implications for the growth of the developing fetus.
This success is the latest output to arise from the good collaboration that we have with Bev Muhlhausler in Adelaide, which has already led to a number of publications.
- Vithayathil MA, Gugusheff JR, Ong ZY, Langley-Evans SC, Gibson RA, Muhlhausler BS (2018). Exposure to maternal cafeteria diets during the suckling period has greater effects on fat deposition and Sterol Regulatory Element Binding Protein-1c (SREBP-1c) gene expression in rodent offspring compared to exposure before birth. Nutrition and Metabolism. 15, 17.
- Langley-Evans SC, Muhlhausler BS (2019). Early life nutritional programming of adult health status. Early Life Origins of Ageing and Longevity Vaiserman A.
- Langley-Evans SC, Muhlhausler BS (2017). Early nutrition, epigenetics and health. Chapter 11, in: Epigenetics of Aging and LonvegityEds: Moskalev A and Vaiserman A.
- Muhlhausler BS, Gugusheff J, Langley-Evans SC (2017). Maternal junk food diets: The effects on offspring fat mass and food preferences. In: Diet, Nutrition and Fetal Programming From Womb to Adulthood, Ed: Patel VB, Preedy VR and Rajendram R. pp 227-238.
The first of a series of papers that have developed from Lujain Almousa’s PhD studies has been published in Magnesium Research.
Given a possible anti-inflammatory role of magnesium in endothelial cells, the aim of this study was to investigate the effects of magnesium on human umbilical vein endothelial cell (HUVEC) viability, gene expression, and the pro-inflammatory response caused by a bacterial endotoxin (LPS). HUVECs were cultured at three different concentrations of magnesium sulphate (0.1 mM; control-1 mM; 5 mM) for 72 hours. Exposing the cells to LPS reduced cell viability in culture with low magnesium, but high magnesium protected the HUVECs from LPS-induced cell death. LPS-treated HUVECs cultured in low magnesium showed up-regulation of mRNA expression for pro-inflammatory factors and the expression of cytokine proteins, including IL-2, IL-3, IL-8, IL-15 and MCP-1. This was associated with greater adhesion of monocytes to the cells. In contrast, high magnesium decreased the expression of inflammatory factors and cytokines. The study found that LPS activation of the expression of many pro-inflammatory factors is exacerbated in the presence of low magnesium concentration whilst a high magnesium concentration partly inhibited the inflammatory response to LPS.
For a long time this blog has been known as The Langley-Evans Lab, which on reflection is a terribly arrogant pronouncement. What I wanted to write about on these pages was the work that I have been doing with my PhD students and colleagues and to reflect on the bricks that our work has contributed to that big wall of human knowledge.
That work isn’t the product of ‘my lab’, or ‘my team’, it’s a product of collaboration and working together. Some of the ideas have been mine, I’ve generated some of the data myself but all of the papers and grant ideas are shared with the many, many PhD students, the postdocs and the collaborators that I’ve had along the way.
As my research moves on, I don’t rely solely on a lab anymore either. We’re published qualitative as well as quantitative date. We’re gathering data from out in the field in Botswana, Uganda, Malawi, Ethiopia and South Africa. The rat study days are largely coming to an end- things are very different to the early days.
So, a new and more inclusive title was needed for the blog and so I came up with ‘One day we will look back on all of this and laugh”. It suits my current mood and it’s something that I often find myself saying at home. It’s a response to the many challenges that life throws ups at home (I own teenagers and my parents are increasingly frail and vulnerable) and at work. Academic life can be so tough- a constant rollercoaster of rejections, terribly rude and dismissive reviewers (and sometimes colleagues) and challenging targets to meet. My resilience is sometimes tested to the absolute limits.
But one day, we will look back on all of this and laugh,
On the 13th July the School of Biosciences had it’s summer Graduation ceremony. The Division of Nutritional Sciences had a bumper haul of PhD’s graduating, and I was particularly pleased to see four of my own students crossing the stage to accept their certificates. Lujain, Grace, Paphani and Bashair all followed very different directions with their research and led me off into new areas that I will be sure to follow up on.
It was great to catch up with them all and meet their families.
Photo by Andy Salter
Former PhD student Lujain Almousa (on right in picture, graduated July 2018) has had her first paper accepted for publication in Magnesium Research. The paper, entitled, ‘Varying magnesium concentration elicits changes in inflammatory response in human umbilical vein endothelial cells (HUVECs)‘ is the first in a series of three papers arising from her PhD project, which has given some interesting insights into the impact of magnesium on the function of the vascular endothelium.
The abstract of the paper is below.
The aims of this study were to determine whether low concentrations of magnesium invitroexacerbatedthe human umbilical vein endothelial cell (HUVEC) response to inflammatory challenge, and whether expressionof the nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB) through the toll-like receptor 4 (TLR4) played a role in this process. HUVECs were incubated with different concentrations of Mg (low- 0.1mM, control- 1mM, high- 5mM) for 72 h before being stimulated with bacterial lipopolysaccharide (LPS) for 4 h. The response of cells to LPS was greater in cells cultured in low Mg, relative to control cells and suppressed in high Mg. Expression of NF-κB was increased in low-Mg and decreased with high Mg. Low Mg increased the expression of TLR4 mRNA, but only in the presence of LPS. Antibody blockade of TLR4 but not TLR2 blunted the reponse of cells to LPS in low Mg, such that they were similar to unblocked 1mM Mg cells. Associations of Mg with cardiovascular disease may therefore relate to inflammatory responses mediated through the TLR4/NF-κB pathway.
We are delighted to welcome Ellen Ward as a new PhD student. Ellen will be starting on October 1st and will be a part of the University of Nottingham-Adelaide joint PhD partnership programme. Like Sally Draycott, Ellen will be co-supervised by myself and Matt Elmes in the UK and Bev Muhlhausler in Adelaide. Her project is entitled, ‘maternal diet and the composition of breast milk: impact of reducing sugar and fat consumption’.