Atrial Natriuretic Peptide in Thermal Acclimation in the Catfish, Silisnss fnsotus

메기(Silums asotus)에서 수온의 변화에 의한 Atrial Natriuretic Peptide의 변동

  • Kim, Sung-Zoo (Department of Biology, College of Natural Sciences, Chunbuk National University) ;
  • Ryu, Hoon (Department of Biology, College of Natural Sciences, Chunbuk National University) ;
  • Lee, Geum-Yeong (Department of Biology, College of Natural Sciences, Chunbuk National University) ;
  • Kim, Hee-Suhn (Department of Physiology, Medical School, Chunbuk National University) ;
  • Cho, Kyung-Woo (Department of Physiology, Medical School, Chunbuk National University)
  • 김성주 (전북대학교 자연과학대학 생물학과) ;
  • 류훈 (전북대학교 자연과학대학 생물학과) ;
  • 이금영 (전북대학교 자연과학대학 생물학과) ;
  • 김희선 (전북대학교 의과대학 생리학교실) ;
  • 조경우 (전북대학교 의과대학 생리학교실)
  • Published : 1992.07.01

Abstract

Responses of immunoreactive atrial natriuretic peptide (ir-ANP) to environmental temperature were studied in the freshwater catfish, Silums usotus, acclimated at various temperatures for one week. According to increase in environmental temperature, plasma sodium and chloride concentrations, and osmolality were significantly increased, while hematocrit showed a marked decrease. When the catfishes frere acclimated at cold $(3^{\circ}C)$ or warm $(18^{\circ}C)$ temperatures, ir-ANP contents in the atrium and bulbus arteriosus were significantly lower than those at $9^{\circ}C.$ However, ventricular contents of ir-ANP urere not different among the three groups.Levels of plasma ir-ANP in the catfish increased in response to the increment of acclimated temperature. On the basis of these results, we suggest that the environmental temperature may modulate synthesis and secretion of ir-hUP in the fish. We also suggest that changes of plasma ir-ANP levels may be associated with the control of body fluid homeostasis.

Keywords