Dr. Victoria Diedrich

Research

Since my Bachelor studies at the Philipps University of Marburg, I have been fascinated by Djungarian hamsters and their remarkable ability to survive the extreme winter conditions of the Siberian steppes. Especially the research on daily torpor as an important part of the hamsters' complex winter acclimatization runs through my entire scientific work at the University of Veterinary Medicine in Hannover and now at Ulm University.

In the research group of Prof. Herwig, I investigate the influence of the hamsters' energetic state with special respect to glucose availability on torpor expression as a potential proximate trigger, as we still do not know which stimulus or interplay of stimuli tells a hamster on a certain day to show a torpor bout. Therefore, I do not only focus on spontaneous daily torpor in winter acclimated hamsters, but also compare it to fasting-induced torpor in summer acclimated hamsters, as these two forms of torpor are just two sides of the same medal.

For my research, I use the following experimental paradigms and methods:

in vivo:

  • radio frequency based telemetry to continously measure body core temperature
  • respiratory gas analysis to measure metabolic rate via indirect calorimetry
  • continuous telemetry to measure blood glucose content
  • food restriction paradigms

in vitro:

  • histochemical and molecluar examination of the intestinal tract
  • immunohistochemical examination of brain tissue

  

Publications

2016
Dumbell RA, Petri I, Scherbath F, Diedrich V, Schmid HA, Steinlechner S, Barrett P (2016) Stomatostatin agonist pasireotide inhibits exercise-stimulated growth in male Siberian hamster (Phodopus sungorus). Journal of Neuroendocrinology, 11/2016,29(1); DOI: 10.1111/jne.12448. Find out more.

Petri I, Diedrich V, Wilson D, Calleja-Fernández J, Herwig A, Steinlechner S, Barrett P (2016) Orchestration of gene expression across the seasons: Hypothalamic gene expression in natural photoperiod troughout the year in the Siberian hamster. Scientific Reports, 07/2016, 6(29689); DOI: 10.1038/srep29689. Find out more.

2015
Diedrich V (2015) Daily torpor in Djungarian Hamsters (Phodopus sungorus): energetics and environmental challenges. Inaugural-Dissertation, University of Veterinary Medicine, Hannover, pp. 94.

Diedrich V, Bank JH, Scherbarth F, Steinlechner S (2015) Torpor expression in juvenile and adult Djungarian hamsters (Phodopus sungorus) differs in frequncy, duration and onset in reponse to a daily cylce in ambient temperature. Journal of Thermal Biology, 08/2015, 53; DOI: 10.1016/jtherbio.2015.08.006. Find out more.

Scherbarth F, Diedrich V, Dumbell RA, Schmid HA, Steinlechner S, Barrett P (2015) Somatostatin receptor activation is involved in the control of daily torpor in a seasonal mammal. American Journal of Physiology - Endocrinology and Metabolism, 07/2015, 309(6); DOI: 10.1152/ajpregu.00191.2015. Find out more.

Dumbell RA, Scherbarth F, Diedrich V, Schmid H, Steinlechner S, Barrett P (2015) Somatostatin agonists promote a physiological state resembling short-day acclimatization in the photoperiodic male Siberian hamster (Phodopus sungorus). Journal of Neuroendocrinology, 05/2015, 27(7); DOI: 10.1111/jne.12289. Find out more.

2014
Diedrich, V, Kumstel S, Steinlechner S (2014) Spontaneous daily torpor and fasting-induced torpor in Djungarian hamsters are characterized by distinct patterns of metabolic rate. Journal of Comparative Physiology B, 12/2014, 185(3); DOI: 10.1007/s00360-014-0882-4. Find out more.

Diedrich V, Steinlechner S, Scherbarth F (2014) Effects of unsaturated fatty acids on torpor frequency and diet selection in Djungarian hamsters (Phodopus sungorus). Journal of Experimental Biology, 10/2014, 217(24); DOI: 10.1242/jeb.113217. Find out more.

Diedrich V, Scherbarth F, Jähnig S, Kastens S, Steinlechner S (2014) Djungarian hamsters (Phodopus sungorus) are not susceptible to stimulating effects of 6-methoxy-2-benzoxazolinone on reproductive organs. Science of Nature, 01/2014, 101(2); DOI: 10.1007/s00114-013-1138-y. Find out more.

2012
Diedrich V, Steinlechner S (2012) Spontaneous daily torpor versus fasting-induced torpor in the Djungarian hamster (Phodopus sungorus): two sides of a medal or distinct phenomena? In: Ruf T, Bieber C, Arnold W, Millesi E (eds). Living in a seasonal world: thermoregulatory and metabolic adaptations. Springer, Berlin, Heidelberg, pp 231-242. Find out more.

Conference contributions

2014
Diedrich V, Steinlechner S (2014) Influence of an environmental stressor on torpor expression in Djungarian hamsters (Phodopus sungorus). Satelliten-Symposium "Epigenetics in animal physiology" im Rahmen der 107. Jahrestagung der Deutschen Zoologischen Gesellschaft, Göttingen, 10.9.-11.9.2014. oral presentation.

Diedrich V, Steinlechner S, Scherbarth F (2014) Dietary composition of unsaturated fatty acids is of minor importance for the occrrence of daily torpor in the seasonal dwarf hamster Phodopus sungorus. 107. Jahrestagung der Deutschen Zoologischen Gesellschaft, Göttingen, 11.9.-11.9.2014, 119.  oral presentation

2013
Bank J, Diedrich V, Steinlechner S (2013) Daily ambient temperatur cycles influence the expression of spontaneous daily torpor in juvenile Djungarian hamsters (Phodopus sungorus). 106. Jahrestagung der Deutschen Zoologischen Gesellschaft, München, 13.9.-16.9.2013, 398, poster

Diedrich V, Steinlechner S (2013) Spontaneous daily torpor versus fasting-induced torpor: Further repirometric characterizatioin in Djungarian hamsters (Phodopus sungorus). 106. Jahrestagung der Deutschen Zoologischen Gesellschaft, München, 13.9.-16.9.2013, 401, poster.

2012
Diedrich V, Scherbarth F, Jähnig S, Kastens S, Steinlechner S (2012) Spring fever in Djungarian hamsters is not triggered by the uptake of 6-Methoxy-2-benzoxazolinone. 105. Jahrestagung der Deutschen Zoologischen Gesellschaft, Konstanz, 21.9.-24.9.2012, 199-200, poster.

Morisset R, Scherbarth F, Diedrich V, Steinlechner S (2012) Even a locked running wheel affects short-day acclimation in Djungarian hamsters. 105. Jahrestagung der Deutschen Zoologischen Gesellschaft, Konstanz, 21.9.-24.9.2012, 206-207, poster.

Diedrich V, Steinlechner S (2012) Spontaneous daily torpor versus fasting-induced torpor in the Djungarian hamster (Phodopus sungorus). 14th International Hibernation Symposium, Semmering, 8.8.-14.08.2012, oral presentation.

Contact

  • Dr. Victoria Diedrich
  • Room: M25/5213
  • Phone: +49 (0) 731-50- 22685
  • Fax: +49 (0) 731-50-22629