Platonin, a cyanine photosensitizing dye, causes attenuation of circulatory shock, hypercoagulable state, and tissue ischemia during heat stroke

Jie Jen Lee, Mao Tsun Lin, Nien Lu Wang, Chia Li Lin, Cheng Kuei Chang

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The aim of this study was to investigate the therapeutic effect of platonin, a cyanine photosensitizing dye as well as an inhibitor of proinflammatory cytokines, in an animal model of heat stroke. Anesthetized rats, immediately after the onset of heat stroke, were divided into two major groups and given the following: normal saline (1 mL per kg body weight) intravenously, or platonin (12.5-50 μg/mL per kg body weight) intravenously. They were exposed to ambient temperature of 43°C to induce heat stroke. Another group of rats was exposed to room temperature (26°C) and used as normothermic controls. Their physiologic and biochemical parameters were continuously monitored. When the vehicle-treated rats underwent heat exposure, their survival time values were found to be 18 to 22 min. Resuscitation with intravenous doses of platonin, but not normal saline, immediately at the onset of heat stroke, significantly improved survival during heat stroke (41-147 min). All heat-stressed animals displayed systemic inflammation and activated coagulation, evidenced by increased tumor necrosis factor-α, prothrombin time, activated partial thromboplastin time, fibrinogen degradation products, and D-dimer, and decreased platelet count and protein C. Biochemical markers evidenced cellular ischemia and injury/dysfunction: plasma levels of blood urea nitrogen, creatinine, glutamic oxaloacetic transaminase, glutamic pyruvic transaminase, and alkaline phosphatase, and striatal levels of partial pressure of oxygen, local cerebral blood flow, glycerol, glutamate, and lactate/pyruvate were all elevated during heat stroke. The systemic inflammation, hypercoagulable state, and cerebral ischemia and injury during heat stroke were all significantly suppressed by platonin. The data demonstrate that platonin therapy may resuscitate heat stroke victims by reducing circulatory shock, systemic inflammation, hypercoagulable state, and tissue ischemia and injury.

Original languageEnglish
Pages (from-to)577-582
Number of pages6
JournalShock
Volume24
Issue number6
DOIs
Publication statusPublished - Jan 2006

Fingerprint

Heat Stroke
Shock
Coloring Agents
Ischemia
Inflammation
Cerebrovascular Circulation
Wounds and Injuries
Hot Temperature
Body Weight
Corpus Striatum
Temperature
Partial Thromboplastin Time
platonin
Partial Pressure
Blood Urea Nitrogen
Prothrombin Time
Therapeutic Uses
Aspartate Aminotransferases
Protein C
Brain Ischemia

Keywords

  • Heat stroke
  • Intracranial pressure
  • Mean arterial pressure
  • Protein C
  • Tumor necrosis factor-alpha

ASJC Scopus subject areas

  • Critical Care and Intensive Care Medicine
  • Physiology

Cite this

Platonin, a cyanine photosensitizing dye, causes attenuation of circulatory shock, hypercoagulable state, and tissue ischemia during heat stroke. / Lee, Jie Jen; Lin, Mao Tsun; Wang, Nien Lu; Lin, Chia Li; Chang, Cheng Kuei.

In: Shock, Vol. 24, No. 6, 01.2006, p. 577-582.

Research output: Contribution to journalArticle

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