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- Hiroshi Miyawaki, Hidetaka Kioka, Kazuaki Sato, Masako Kurashige, Takayuki Ozawa, Hirohiko Shibayama, Shungo Hikoso, Eiichi Morii, Keiko Yamauchi-Takihara, and Yasushi Sakata.
- Department of Cardiovascular Medicine, Osaka University Graduate School of Medicine, Japan.
- Intern. Med. 2020 Jan 15; 59 (2): 229-233.
AbstractConstitutive activation of the Janus kinase/signal transduction and activator of transcription (JAK-STAT) signaling pathway plays a central role in the pathogenesis of myelofibrosis (MF) and pulmonary hypertension (PH) is a known complication of MF. On the other hand, it has been proposed that the JAK-STAT pathway, especially signal transducer and activation of transcription (STAT) 3 activation, protects cardiomyocytes from various stresses. We describe the case of a patient with MF-associated PH who developed left ventricular dysfunction after five years of treatment with the JAK 1/2 inhibitor, ruxolitinib. This is the first report with histopathological findings that demonstrate possible contradictory effects of a JAK 1/2 inhibitor: improvement of MF-associated PH and cardiotoxicity.
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