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Pathogenesis of AD is similar to that of uremic encephalopathy of Homocysteic acid. (Homocysteic acid is a pathogen of Alzheimer's disease in human) 2 Abstract Homocysteic acid (HA) has been established as a pathogen in Alzheimer's disease (AD) in 3xTg-AD model mice. However, it is not established whether HA is involved in the AD pathogenesis in humans. We investigated the relationship between urinary HA levels and Mini-Mental State Examination (MMSE) scores in patients with AD (n = 110, normal =22, AD=88) and found a positive, statistically significant relationship between the two variables (r = 0.39, p =0.00003, n = 110). This relationship was stronger in females. (r = 0.47, p = 0.00008, n = 65 in females; r = 0.39, p = 0.02, n =45 in males). Urinary HA level difference between normal and AD in female was statistical significant (normal:18.4 + 10.6vsAD: 9.1 + 7.2 mM,p<0.01), but this difference of male was not statistical significant. (normal:12.7 + 6 vs AD 8.8 + 7.8). Smoking, hypertension, and diabetes mellitus decreased urinary HA excretion. On the basis of these results, we showed that HA is usually excreted into urine in humans and did not affect brain function in normal individuals. However, when urinary HA excretion was decreased, HA was shown to damage brain function, particularly cognitive ability. To confirm our hypothesis, that is, when urinary HA is suppressed to be excreted into urine, the blood HA level will be increased, we examined the relationship between the urinary HA level and blood HA level in 19 patients. The result was shown that the negative statistical significant relationship between them was observed (r=-0.6, p=0.007, n=19). From this result, the uremic encephalopathy of HA toxicity was confirmed. However it is a question that how the blood HA affected the brain cognitive function. The direct effect of green tea leaves ingestion on HA level and MMSE score were also observed. Ingested green tea leaves decreased HA level in blood and concomitantly increased MMSE score, suggesting that blood HA could affect the cognitive function. But How? Some papers showed the exogenous NMDA including HA disrupted blood brain barrier and entered into brain and affected the cognitive function to decrease MMSE score. These results indicate that human AD pathogenesis is influenced by HA, and that HA is a human pathogen in AD, indicating that the pathogenesis of AD is similar to that of uremic encephalopathy. Also urinary …