Altered Steroidogenesis in Response to Impaired Mitochondrial Protein Homeostasis

Mild mitochondrial proteostatic stress increases cortisol synthesis, while severe stress suppresses it, revealing a biphasic steroidogenic response linked to mitochondrial protein import.

• Why it matters: The field lacks a clear mechanism connecting mitochondrial proteostasis to mitochondrial steroidogenesis, and this gap matters for understanding stress-linked hormone changes in disease.
• What they did: The study tested how impaired mitochondrial proteostasis affects mitochondrial protein import and cortisol production, including STARD1-dependent cholesterol transport and downstream effects under severe stress.
• The result: Mild stress boosted cholesterol import and cortisol in a STARD1-dependent manner, whereas severe stress inhibited cortisol independently of STARD1; increased cortisol synthesis was also seen in rotenone, A53T alpha-synuclein, and PINK1-KO models of Parkinson’s disease.

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