• Port-a-Patch

    Smallest patch clamp setup in the world
  • Port-a-Patch

    Easy to learn - ideal for teaching
  • Port-a-Patch

    Records from cells, organelles and bilayers
  • Port-a-Patch

    First planar patch clamp device on the market
  • Port-a-Patch

    Ideal for internal solution exchange applications

2014 - L-Carnitine Reduces in Human Conjunctival Epithelial Cells Hypertonic- Induced Shrinkage through Interacting with TRPV1 Channels

icon pap  Port-a-Patch publication in Cellular Physiology and Biochemistry (2014)

Authors:
Khajavi N., Reinach P.S., Skrzypski M., LudeA., Mergler S.

 

Journal:
Cell Physiol Biochem (2014) 34:790-803


Abstract:

Background/Aims:
Ocular surface health depends on conjunctival epithelial (HCjE) layer integrity since it protects against pathogenic infiltration and contributes to tissue hydration maintenance. As the same increases in tear film hyperosmolarity described in dry eye disease can increase corneal epithelial transient receptor potential vanilloid type-1 (TRPV1) channel activity, we evaluated its involvement in mediating an osmoprotective effect by L-carnitine against such stress.

Methods:
Using siRNA gene silencing, Ca2+ imaging, planar patch-clamping and relative cell volume measurements, we determined if the protective effects of this osmolyte stem from its interaction with TRPV1.

Results:
TRPV1 activation by capsaicin (CAP) and an increase in osmolarity to ≈ 450 mOsM both induced increases in Ca2+ levels. In contrast, blocking TRPV1 activation with capsazepine (CPZ) fully reversed this response. Similarly, L-carnitine (1 mM) also reduced underlying whole-cell currents. In calcein-AM loaded cells, hypertonic-induced relative cell volume shrinkage was fully blocked during exposure to L-carnitine. On the other hand, in TRPV1 gene-silenced cells, this protective effect by L-carnitine was obviated.

Conclusion:
The described L-carnitine osmoprotective effect is elicited through suppression of hypertonic-induced TRPV1 activation leading to increases in L-carnitine uptake through a described Na+-dependent L-carnitine transporter.


Download here

Back to Overview

Cookies make it easier for us to provide you with our services. With the usage of our services you permit us to use cookies.
More information Ok