Congratulations to Tessa Adler, Yale undergraduate student in the lab of Dr. Nina Stachenfeld, who was awarded the Undergraduate Research Excellence Fellowship from the American Physiological Society. This competitive APS program funds only six full-time undergraduate students with significant prior laboratory research experience to work for 10 weeks during the summer in the laboratory of an established APS investigator. The intent of this program is to encourage students to pursue a career as a basic research scientist. Fellows also receive a travel grant to allow them to attend and present their research data at the following year’s Experimental Biology annual meeting.
Charlotte Usselman, PhD has been a Post Doctoral Fellow in Dr. Nina Stachenfeld’s laboratory since November, 2015. Before coming to the Pierce Laboratory, Dr. Usselman trained in Kevin Shoemaker’s laboratory at Western University (Canada), one of the most prestigious laboratories in the world studying neurovascular control of blood pressure. A paper recently published from her work in that laboratory, Hormone phase influences sympathetic responses to high levels of lower body negative pressure in young healthy women was recently published in Am J Physi – Reg, Integrative Comp Physiol (http://ajpregu.physiology.org/content/311/5/R957). This paper was chosen by the Journal as an APSselect Paper.
APSselect: The editorial team carefully selects from the top articles nominated each month across the 10 APS (American Physiological Society) research journals that highlight, promote, and rapidly disseminate some of the most stimulating original research. This is a rare and exciting honor, especially for a scientist in the early phase of what is obviously a promising career in physiology.
This study examined the role that circulating sex hormones play on maintaining blood pressure during orthostatic challenges. Orthostatic challenges are those which encourage the pooling of blood in the lower body, such as standing for a long time, or moving from seating or lying to standing. Usselman et al. found that high female sex hormone conditions were associated with greater peripheral blood pooling, likely the result of estrogen as a dilator of peripheral blood vessels. One unexpected finding was that women taking hormonal contraceptives experienced a fall in blood pressure at the highest level of lower body negative pressure, implying that hormone exposure may reduce orthostatic tolerance in young women. Together, these data improve our understanding of the role of sex hormones on the regulation of blood pressure, and provide some insight into the mechanisms by which young women have an increased risk for orthostatic intolerance but are protected from hypertension.
By Ziba Kashef
The vast majority of Alzheimer’s disease cases are not directly inherited but linked to environmental and genetic factors. Yet most models used for studying Alzheimer’s in animals mimic the inherited form of the disease.
Yale researchers developed a novel model that may prove useful to the study of Alzheimer’s at its earliest stages. Led by associate professor of neuroscience Justus Verhagen of The John B. Pierce Laboratory and research scientist Alla Ivanova, the researchers studied mice lacking a protein, Fus1, that helps regulate mitochondria — the structures that maintain the balance of critical functions within cells.
In tests, these animals exhibited a loss of smell as well as spatial memory — early signs of Alzheimer’s in people. If confirmed in further studies, the model could serve as an additional tool for understanding the role of Fus1 and mitochondria in the development of Alzheimer’s, said the researchers.
Read the full study published in Frontiers in Aging Neuroscience.