Characterization of cultured smooth muscle cells obtained from the palmar digital arteries of horses.

The research paper describes the successful development of methods to isolate, culture and analyze smooth muscle cells specifically obtained from palmar digital arteries of horses. The findings could aid in understanding the cellular mechanisms involved in horse diseases such as laminitis.

Methodology

• The researchers started with obtaining smooth muscle explants from the medial or lateral palmar digital arteries from the forelimbs of six horses.
• They performed incisions along the length of the arterial segments. The innermost layer of the artery (tunica intima) was lightly scraped off from the underlying middle layer (tunica media) to obtain explants from the tunica media.
• They were able to get approximately 18 to 24 explants from each palmar digital artery segment that they processed.
• For initiating primary culture of smooth muscle cells, a technique that involves attaching to the substrate was used.

Identification and Characterization of Smooth Muscle Cells (SMC)

• The identification of cultured cells as SMC was achieved using various techniques – light microscopy, electron microscopy, reverse transcriptase-polymerase chain reaction (RT-PCR), and northern blot analysis.
• For characterizing SMC’s replication index and serum dependence in culture, bromodeoxyuridine (a synthetic nucleoside) was used.
• SMCs from equine palmar digital arteries were successfully cultured as confirmed via RT-PCR and northern blot analysis techniques that detected smooth muscle alpha-actin and also identified SMC-specific organelles using electron microscopy.
• Upon characterization using light and electron microscopy, it was discovered that the SMC had undergone a phenotypic modulation to a more synthetic phenotype while in culture, yet they still retained the characteristics of SMC.

Conclusions

• The study concluded that development of a culture from SMC from equine palmar digital arteries using an explant protocol is a feasible method to study vascular biological mechanisms in horses.
• This development could assist researchers in conducting in vitro studies of SMC to shed light on the cellular mechanisms entailed in diseases such as laminitis.