Stem Cell Therapy for Parkinson's Disease in Thailand

Parkinson's disease is caused by the progressive loss of dopamine-producing neurons in the substantia nigra, a region of the midbrain essential for coordinating movement. By the time motor symptoms appear, approximately 60-80% of these neurons have already been lost.

Abnormal accumulation of alpha-synuclein protein into clumps called Lewy bodies within neurons is a hallmark of the disease. These protein aggregates interfere with normal cellular function and contribute to neuronal death.

Chronic neuroinflammation driven by activated microglia (the brain's immune cells) creates a toxic environment that accelerates dopaminergic neuron damage and disease progression.

Genetic mutations in genes such as LRRK2, PARK7, PINK1, and SNCA account for approximately 10-15% of cases. However, most Parkinson's cases are idiopathic, arising from a complex interaction of genetic susceptibility and environmental factors.

Environmental exposures, including pesticides (rotenone, paraquat), heavy metals, and certain industrial chemicals, have been associated with increased risk of developing Parkinson's disease, particularly with prolonged exposure.

Mitochondrial dysfunction and oxidative stress within dopaminergic neurons create a vicious cycle of energy failure and cellular damage that progressively worsens over time.

Resting tremor, typically beginning in one hand (often described as "pill-rolling"), is the most recognisable symptom. The tremor usually starts on one side and may spread to the other as the disease progresses.

Bradykinesia (slowness of movement) affecting everyday tasks such as buttoning a shirt, typing, writing (micrographia), or rising from a chair. This is often the most functionally disabling motor symptom.

Rigidity and muscle stiffness throughout the body, creating a feeling of tightness and resistance to movement. This contributes to the characteristic stooped posture and reduced arm swing during walking.

Postural instability and balance difficulties, increasing the risk of falls, particularly when turning, standing up, or navigating obstacles. Falls are a major source of injury in Parkinson's patients.

Speech changes including a softer, more monotone voice (hypophonia), difficulty with articulation, and reduced facial expression (masked face or hypomimia) that can affect communication and social interaction.

Non-motor symptoms including constipation, loss of smell (anosmia), sleep disturbances (REM sleep behaviour disorder), depression, anxiety, and cognitive changes that may precede motor symptoms by years.