Jack McAlhany, Wofford College
I applied for College of Charleston REU uncertain of the specific research I would partake in this summer. The email finally arrived containing my area of focus and I immediately told my parents “ This is perfect and will unify the topics I studied in school this year. I am researching a disease of the pancreas. My project is titled ‘Pancreatitis: an environmentally-induced inflammatory disease of South African fishes. ’ ” I arrived at Grice Marine Laboratory well-read on the etiology and symptoms of pancreatitis, only to find that an exchange of two little letters could make all the difference in my summer plans.
My research this summer was actually on panSTeatitis, a non-transmissible, inflammatory disease of the fat tissue in South African fishes, particularly the tilapia. The interest for this research arose in 2008 when, as seen in Figure 2, 170 of the 600 Nile Crocodiles in Kruger National Park in South Africa died and the cause of death was attributed to pansteatitis (Ashton, 2010). The crocodiles are considered a sentinel species (Botha et al. 2011) as well as one of the main tourist attractions of the park, so this mobilized considerable interest into determining the causes of pansteatitis. After considerable research from various laboratories, the general consensus is that pansteatitis is the oxidation and eventual death of fat tissue seen in Figure 1 (Huchzermeyer, 2012), although the cause of the oxidation is still questioned. The proposed roots of pansteatitis are consumption of rancid, already oxidized fats, consumption of a high polyunsaturated to saturated fatty acids, which are more readily oxidized, or ingestion of metal pollutants that exacerbate the oxidation process (Huchzermeyer et al. 2013).
Figure 1: Early pansteatitis lesion in mesenteric fat of sharp tooth catfish (left). Adipose tissue necrosis after developed pansteatitis in the same fish (right) (Huchzermeyer, 2012).
|Figure 2: Nile Crocodiles found dead in Kruger National Park due to pansteatitis (Rickrideshorses, 2011).|
We will be researching the fatty acid composition of tilapia, which act as a model organism, and attempting to find a relationship among the fatty acids that will be able to act as a biomarker for determining whether an organism is affected with pansteatitis. This biomarker will allow for field testing using a simple blood test rather than the current method, which requires euthanasia to observe the fat tissue. A success in our research will facilitate sampling of organisms for pansteatitis and hopefully hone in on a potential cause of pansteatitis.
Funding for analysis of data is through the National Institute of Standards and Technology (NIST). Funding for sample collection is from Dr. Bowden, MUSC and Dr. Guillette, as well as collaborative South African laboratories.
Ashton, P. 2010. The demise of the Nile crocodile (Crocodylus niloticus) as a keystone species for aquatic ecosystem conservation in South Africa: The case of the Olifants River. Aquatic Conservation: Marine and Freshwater Ecosystems. 20: 489-493.
Botha, H., Van Hoven, W., Guillette, L. 2011. The decline of the Nile crocodile population in Loskop Dam, Olifants River, South Africa. Water SA. 37(1): 103-108.
Huchzermeyer, D. 2012. Prevalence of pansteatitis in African sharptooth catfish, Clarias gariepinus (Burchell), in the Kruger National Park, South Africa. Journal of the South African Veterinary Association. 83(1).
Huchzermeyer, D., Osthoff, G., Hugo, A., Govender, D. 2013. Comparison of the lipid properties of healthy and pansteatitis-affected African sharptooth catfish, Clarias gariepinus (Burchell), and the role of diet in pansteatitis outbreaks in the Olifants River in the Kruger National Park, South Africa. Journal of Fish Diseases. 36(11): 897-909.
Rickrideshorses. 2011. The Pansteatitis Pollution that Turned Crocodiles to Rubber. HubPages.