Evidence for in vivo production of Humanin peptide, a neuroprotective factor against Alzheimer's disease-related insults.
Tajima. Hirohisa H; Niikura. Takako T; Hashimoto. Yuichi Y; Ito. Yuko Y; Kita. Yoshiko Y; Terashita. Kenzo K; Yamazaki. Kazuto K; Koto. Atsuo A; Aiso. Sadakazu S; Nishimoto. Ikuo I
Key Findings
- Humanin peptide suppresses Alzheimer’s‑related neurotoxicity in lab tests
- Anti‑Humanin antibodies detected a 3‑kDa Humanin protein in mouse testis, colon, and in Alzheimer’s brains but little in normal brains
- The study confirms Humanin is produced in vivo, suggesting a natural role in brain disease
Practical Outcomes
- For biohackers, this suggests Humanin could be a target for neuroprotective strategies, but the research doesn’t provide dosing or supplement guidelines yet. More work is needed before practical protocols can be recommended.
Summary
Scientists found that the tiny protein Humanin, which can protect brain cells from Alzheimer's damage, is actually made inside the body, especially in testis, colon, and Alzheimer's-affected brains, but not much in normal brains. This shows Humanin isn’t just a lab trick—it exists naturally and might matter for brain health.
Abstract
An unbiased functional screening with brain cDNA library from an Alzheimer's disease (AD) brain identified a novel 24-residue peptide Humanin (HN), which suppresses AD-related neurotoxicity. As the 1567-base cDNA containing the open reading frame (ORF) of HN is 99% identical to mitochondrial 16S ribosomal RNA as well as registered human mRNA, it was elusive whether HN is produced in vivo. Here, we raised anti-HN antibody and found that long cDNAs containing the ORF of HN (HN-ORF) produced the HN peptide in mammalian cells, dependent on the presence of full-length HN-ORF. Immunoblot analysis detected a 3-kDa protein with HN immunoreactivity in the testis and the colon in 3-week-old mice and in the testis in 12-week-old mice. HN immunoreactivity was also detected in an AD brain, but little in normal brains. This study suggests that HN peptide could be produced in vivo, and would provide a novel insight into the pathophysiology of AD.
Study Information
pubmed
2002
2002-05-24T00:00:00.000Z
10.1016/s0304-3940(02)00199-4