Current concepts on the pathophysiology of pasture-associated laminitis.

The study focuses on the causes and contributing factors behind the prevalence of a condition known as ‘pasture-associated laminitis’ in horses and ponies, with an emphasis on dietary components and metabolic/endocrine irregularities, while also exploring the possible mechanisms behind the development of this condition.

Epidemiology of Pasture-associated Laminitis

• This research paper discusses the frequency of laminitis, a painful and potentially debilitating condition affecting the hooves of horses and ponies. The term ‘pasture-associated laminitis’ is derived from the observation that most instances of this disease occur in animals that are reared at pasture.
• It informs us that the onset of clinical laminitis often coincides with conditions that encourage the buildup of rapidly fermentable nonstructural carbohydrates (fructans, simple sugars, or starches) in the pasture.
• The study states that animals that exhibit the equine metabolic syndrome (EMS) phenotype – characterized by insulin resistance, abnormal insulin dynamics, and possibly obesity, are predisposed to a higher risk of developing the condition.

Role of Forage Carbohydrates and Metabolic/Endocrine Factors

• The research identifies the consumption of pasture forage as one of the potential triggers for laminitis. However, the precise mechanisms interrelating forage intake and lamellar failure are yet to be fully understood.
• The study mentions that a systemic inflammatory response, which is linked with carbohydrate overload in the hindgut, is suspected to play a role in initiating inflammatory events at the lamellar level. These events include infiltration and activation of leukocytes which contribute to the destruction of lamellar epithelium and extracellular matrix.
• Metabolic or endocrine disorders are emphasized as they seemingly enhance the susceptibility of horses and ponies to pasture-associated laminitis. Particularly, those suffering from EMS are believed to be at a greater risk.

Pathophysiology of Pasture-associated Laminitis

• The paper discusses extensively on the pathophysiology of pasture-associated laminitis, or in other words, the functional changes that accompany this condition.
• Understanding the pathophysiology is crucial in further elucidating the underlying pathological processes and ultimately developing effective preventive and therapeutic strategies.