Previous studies have indicated edema may be involved in the pathophysiology following hypoxic-ischemic encephalopathy (HIE), and melatonin may exhibit neuro-protection against brain insults. However, little is known regarding the mechanisms that involve the protective effects of melatonin in the brain and peripheral tissues after HIE. The present study aimed to examine the effects of melatonin on multiple organs, and the expression of edema related proteins in a neonatal rat model of hypoxic-ischemic brain damage (HIBD).
One hundred ninety-two neonatal rats were randomly divided into three subgroups that underwent a sham surgery or HIBD. After the HIBD or sham-injury, the rats received an intraperitoneal injection of melatonin or an equal volume vehicle, respectively. We investigated the effects of melatonin on brain, kidney, and colon edema via histological examination and the expression of edema related proteins, including AQP-4, ZO-1 and occludin, via qPCR and western blot.
Our data indicated (1) Melatonin reduced the histological injury in the brain and peripheral organs induced by HIBD as assessed via H-E staining and transmission electron microscopy. (2) Melatonin alleviated the HIBD-induced cerebral edema characterized by increased brain water content. (3) HIBD induced significant changes of edema related proteins, such as AQP-4, ZO-1 and occludin, and these changes were partially reversed by melatonin treatment.
These findings provide substantial evidence that melatonin treatment has protective effects on the brain and peripheral organs after HIBD, and the edema related proteins, AQP4, ZO-1, and occludin, may indirectly contribute tothe mechanism of the edema protection by melatonin.
Volpe JJ. Neurology of the Newborn. 4. In: Hypoxic-ischemic encephalopathy: Clinical aspects. Philadelphia: WB Saunders Co; 2000. p. 331–96.
Lupton BA, Hill A, Roland EH, Whitfield MF, Flodmark O. Brain swelling in the asphyxiated term newborn: pathogenesis and outcome. Pediatrics. 1988;82(2):139–46. PubMed
Scallan J, Huxley VH, Korthuis RJ. Capillary fluid exchange: regulation, functions, and pathology[J]. Colloquium. 2010(1).
Liu K, Agre P. Aquaporin Water Channels. In: Lane WJLD, eidotr. Encyclopedia of Biological Chemistry. Waltham: Academic Press; 2013. p. 120-6.
Gilad E, Cuzzocrea S, Zingarelli B, Salzman AL, Szabo C. Melatonin is a scavenger of peroxynitrite. Life Sci. 1997;60(10):L169–74. CrossRef
- Melatonin alleviates brain and peripheral tissue edema in a neonatal rat model of hypoxic-ischemic brain damage: the involvement of edema related proteins
- BioMed Central
Neu im Fachgebiet Pädiatrie
Meistgelesene Bücher aus dem Fachgebiet
Mail Icon II