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Cognitive

Dihexa Guia & Tabela de Dose

An angiotensin-IV-derived peptide studied for synaptogenesis.

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Dihexa — Tabela de dose
Cada linha citada
ObjetivoDoseFrequênciaDuraçãoEvidênciaFonte
Hair cell protection from aminoglycoside ototoxicity (zebrafish lateral line model) 1 mcg per trial per trial Preclinical PMID 25674052
Cognitive impairment rescue and memory recovery in APP/PS1 Alzheimer's mouse model 1 mg per trial per trial Preclinical PMID 34827486
Peripheral nerve regeneration and limb function recovery after sciatic nerve repair 2–4 mg per trial 16 weeks Preclinical PMID 34703584
Apenas para fins de pesquisa e educação. Não é aconselhamento médico.

What is Dihexa?

Dihexa is a small synthetic peptide derived from angiotensin IV — a fragment of the body's blood-pressure-regulating hormone system. But Dihexa's claim to fame isn't blood pressure. Researchers are interested in it because it appears to promote synaptogenesis — the formation of new connections between brain cells. Think of synapses as the handshakes between neurons. More handshakes mean better communication, and better communication may mean sharper memory and learning.[2]

What makes Dihexa stand out among research peptides is its unusual potency and its ability to cross the blood-brain barrier — the tight security checkpoint that keeps most large molecules out of the brain. It can also be taken orally, which is rare for peptides.[5] That combination has made it a subject of growing interest in neuroscience labs.

Important note: Dihexa is a research compound only. It is not approved for human use, and nothing here is medical advice.

How Dihexa Works

Here's a simple way to picture it. Your brain produces a protein called hepatocyte growth factor (HGF). HGF acts like a construction foreman — it tells neurons to build new branches and connections. The receptor it docks onto is called c-Met.

Dihexa works by binding tightly to HGF and acting as a helper molecule. It teams up with small, background amounts of HGF that would normally be too weak to trigger c-Met. Together, they activate c-Met and kick off a chain of events that drives spinogenesis (growth of tiny spine-like protrusions on neurons) and synaptogenesis (formation of actual synaptic connections).[5]

A second pathway also matters here. In Alzheimer's mouse studies, Dihexa activated the PI3K/AKT signaling pathway — a key survival and growth circuit inside cells. This appeared to reduce inflammation, slow neuron death, and support memory function.[2]

A broader review of neuroactive peptides confirms that Dihexa enhances both BDNF (brain-derived neurotrophic factor) and the HGF/c-Met pathway — two routes considered critical to neuroplasticity, the brain's ability to rewire itself.[1]

What the Research Shows

Alzheimer's mouse model

In a study using APP/PS1 mice — a standard genetic model of Alzheimer's disease — researchers gave Dihexa orally and tracked what happened. The mice showed restored spatial learning and memory in the Morris water maze, a classic navigation test. Brain tissue showed more surviving neurons and higher levels of synaptophysin, a protein that marks healthy synaptic activity. Inflammation markers (IL-1β, TNF-α) dropped, while the anti-inflammatory signal IL-10 rose. Blocking the PI3K pathway reversed these benefits, confirming that pathway was essential to Dihexa's effects.[2]

Peripheral nerve regeneration

A rat sciatic nerve repair study tested whether Dihexa could help limbs recover after a nerve was surgically cut and repaired. Animals treated with Dihexa (alongside stem cells or G-CSF) showed significantly better motor function scores at 8–16 weeks compared to controls. Walking footprint grades improved, and foot flexion contractures — a sign of poor nerve re-innervation — were reduced. The researchers concluded that Dihexa is a promising adjunct for nerve repair strategies.[3]

Hair cell protection (hearing)

A zebrafish study used the lateral line — a sensory organ with hair cells nearly identical to those in the human inner ear — to test whether Dihexa could protect against aminoglycoside ototoxicity. Aminoglycosides are a class of antibiotics (like gentamicin and neomycin) notorious for damaging hearing. Dihexa provided strong protection against both ototoxins. The protection was blocked by an HGF antagonist, confirming the HGF/c-Met mechanism was at work. Notably, Dihexa did not stop the antibiotic from entering the hair cells — instead, it appeared to protect from the inside out, through intracellular survival signals.[4]

What Dihexa Is Being Studied For

  • Cognitive decline and Alzheimer's disease — memory recovery and neuroprotection in preclinical models[2]
  • Synaptogenesis — stimulating new synaptic connections in the hippocampus[5]
  • Peripheral nerve repair — supporting functional recovery after nerve injury[3]
  • Hearing protection — shielding sensory hair cells from drug-induced damage[4]
  • General neuroplasticity — as part of a broader class of neuroactive peptides targeting HGF/c-Met and BDNF pathways[1]

How Dihexa Is Dosed in Research

Doses in preclinical studies vary widely depending on the model and goal. The dosage chart on this page summarizes the key figures — from microgram-level doses used in zebrafish hair cell studies, to milligram-per-kilogram doses used in Alzheimer's mouse and rat nerve repair models.[2][3][4] Because doses differ so much across species and study types, the calculator on this page can help contextualize these numbers for research reference purposes. Always anchor any analysis to the specific model and protocol described in the primary literature.

Mixing and Storing Dihexa

Dihexa typically arrives as a lyophilized (freeze-dried) powder. To reconstitute it, researchers generally add bacteriostatic water or sterile saline slowly to the vial, letting the liquid run down the side rather than shooting it directly onto the powder. Swirl gently — don't shake — to dissolve. Once reconstituted, store the solution in a refrigerator (2–8 °C) and use within a few weeks, or freeze aliquots at −20 °C for longer storage. Protect from light. Repeated freeze-thaw cycles degrade peptides, so single-use aliquots are standard lab practice. Always label vials with the date of reconstitution and the concentration.

Sources

  1. Therapeutic Peptides in Orthopaedics: Applications, Challenges, and Future Directions. — Journal of the American Academy of Orthopaedic Surgeons. Global research & reviews, 2026. PMID 41490200.
  2. AngIV-Analog Dihexa Rescues Cognitive Impairment and Recovers Memory in the APP/PS1 Mouse via the PI3K/AKT Signaling Pathway. — Brain sciences, 2021. PMID 34827486.
  3. Stem cell, Granulocyte-Colony Stimulating Factor and/or Dihexa to promote limb function recovery in a rat sciatic nerve damage-repair model: Experimental animal studies. — Annals of medicine and surgery (2012), 2021. PMID 34703584.
  4. Hepatocyte growth factor mimetic protects lateral line hair cells from aminoglycoside exposure. — Frontiers in cellular neuroscience, 2015. PMID 25674052.
  5. The procognitive and synaptogenic effects of angiotensin IV-derived peptides are dependent on activation of the hepatocyte growth factor/c-met system. — The Journal of pharmacology and experimental therapeutics, 2014. PMID 25187433.
  6. Dimeric DOTA-alpha-melanocyte-stimulating hormone analogs: synthesis and in vivo characteristics of radiopeptides with high in vitro activity. — Journal of receptor and signal transduction research, 2007. PMID 18097939.

Dihexa Perguntas

What is Dihexa?
Dihexa is a synthetic peptide derived from angiotensin IV, a fragment of the body's renin-angiotensin hormone system. Researchers study it for its ability to cross the blood-brain barrier, activate the HGF/c-Met signaling system, and promote the formation of new synaptic connections between neurons — a process called synaptogenesis.[5] It is a research compound, not an approved medicine.
How does Dihexa work?
Dihexa binds tightly to hepatocyte growth factor (HGF) and amplifies its signal at the c-Met receptor, even when HGF levels are low. This triggers neuron growth, spine formation, and synapse creation. It also activates the PI3K/AKT pathway, which supports cell survival and reduces neuroinflammation.[2][5] Think of it as a volume knob that turns up a naturally quiet brain-growth signal.
What is Dihexa used for in research?
Preclinical research has explored Dihexa for cognitive impairment and memory recovery in Alzheimer's mouse models,[2] peripheral nerve regeneration after surgical repair,[3] and protection of sensory hair cells in the inner ear from antibiotic-induced damage.[4] It is also reviewed as part of a broader class of neuroactive peptides relevant to neuroplasticity.[1]
How is Dihexa dosed in research studies?
Doses range considerably by model. Zebrafish hair cell studies used very small concentrations,[4] Alzheimer's mouse studies used milligram-per-trial oral dosing,[2] and rat nerve repair studies used 2–4 mg/kg over 16 weeks.[3] See the dosage chart on this page for specifics. These are animal research figures and do not translate directly to human use.
How do you reconstitute Dihexa?
Add bacteriostatic water or sterile saline slowly to the lyophilized powder, letting liquid run down the vial wall. Swirl gently to dissolve — never shake. Store reconstituted solution at 2–8 °C for short-term use, or freeze aliquots at −20 °C. Avoid repeated freeze-thaw cycles, which degrade peptide integrity. Label each vial with the reconstitution date and concentration.
Is Dihexa safe?
Dihexa has not been evaluated in human clinical trials, so its safety profile in humans is unknown. Preclinical animal studies have not reported major adverse effects at the doses tested,[2][3] but animal data cannot be directly applied to humans. Additionally, one key mechanistic study has been retracted.[5] Dihexa is strictly a research compound and should not be used for human self-administration.