The short version of Semax fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-01-24. Anything still debated is marked as such rather than presented as settled.
当时的短肽研究普遍关注能否穿越血脑屏障、在低剂量下产生中枢效应，Semax 属于这一路线。鼻内给药是其主要使用方式，俄语文献报道的适应症涵盖缺血性卒中、短暂性脑缺血发作、认知功能减退以及视神经病变。这些研究大多发表在当地期刊上，样本规模与终点设置同西方试验惯例存在差异，国际同行对其临床证据的强度看法不一。
各国监管态度分化明显。俄罗斯按处方药管理，部分东欧国家留有使用记录；欧盟与美国未批准其作为药物上市，市面流通品通常标注为研究用化学品。身份差异意味着标示含量、纯度与无菌性缺少统一核查。体育领域还牵涉反兴奋剂名录，跨境携带则受目的地药品法规约束。
Semax 是人工设计的七肽，序列为 Met-Glu-His-Phe-Pro-Gly-Pro，骨架取自促肾上腺皮质激素片段 ACTH(4-10)。它于二十世纪八十年代在苏联的分子遗传学研究机构内合成。设计目标是保留该片段与注意力和记忆相关的活性，同时剔除促皮质激素释放等内分泌作用。此后俄罗斯将其登记为药品并进入临床使用。
Semax is a synthetic peptide created in the Soviet Union during the early 1980s by researchers working in Moscow. It was built from the short adrenocorticotropic hormone fragment known as ACTH(4-10), and the chain was then extended with three additional amino acids. The resulting molecule was named semax and entered clinical use in Russia in 1994. It is generally described as a nootropic and neuroprotective agent rather than as a hormone analogue.
The parent fragment ACTH(4-10) carries the sequence Met-Glu-His-Phe-Arg-Trp-Gly. Semax replaces the arginine and tryptophan positions with a proline-glycine-proline tail, giving Met-Glu-His-Phe-Pro-Gly-Pro. That change removes residues associated with adrenal stimulation, so the peptide does not drive cortisol release the way full ACTH does. This distinction shapes how the compound is grouped in the literature, where it sits with neuropeptides and peptide neuromodulators rather than with corticosteroids.
Regulatory status varies sharply by country. Semax is registered for medical use in Russia, where it appears in formularies as a nasal solution, and it also holds registration in a small number of neighbouring states. It has no approval from the United States Food and Drug Administration or the European Medicines Agency, and it is not a scheduled controlled substance in most jurisdictions. Elsewhere it circulates mainly as laboratory material, so purity documentation comes from suppliers rather than from a national pharmacopoeia.
| Property | Value | Notes |
|---|---|---|
| 结构类别 | 线性合成七肽 | 无环化结构，不含二硫键 |
| 氨基酸序列 | Met-Glu-His-Phe-Pro-Gly-Pro | N 端为甲硫氨酸 |
| 分子量 | 约 814 Da | 游离碱形式的计算值 |
| 外观 | 白色至类白色粉末 | 具吸湿性 |
| 溶解性 | 易溶于水 | 亦可溶于甲醇等极性溶剂 |
Semax is a synthetic heptapeptide whose sequence is Met-Glu-His-Phe-Pro-Gly-Pro. The first four residues correspond to the ACTH(4-10) fragment, while the terminal Pro-Gly-Pro extension was added to improve metabolic stability. Its molecular formula is C37H51N9O10S and its monoisotopic mass is approximately 813.9 Da. The compound is classified as a peptide research chemical and as a registered pharmaceutical product in Russia, but it does not hold marketing approval in the European Union or the United States. Naming conventions vary across supplier catalogs.
Development of the compound took place in the Soviet Union during the 1980s, largely through peptide research groups affiliated with the Shemyakin-Ovchinnikov Institute and Moscow State University. Investigators screened fragments of adrenocorticotropic hormone for activity on the central nervous system while attempting to separate cognitive effects from hormonal ones. The shortened sequence was selected because it retained behavioral activity in animal models without stimulating corticosteroid release. Early publications described the molecule as an ACTH(4-10) analog.
Published research on this peptide originates mainly from Russian laboratories, and the wider international literature is comparatively thin. Studies have used rodent models of stroke, hypoxia, and memory tasks, with a smaller number of human trials reported. Reported outcomes include changes in attention and memory measures, along with effects on neurotrophic factor expression in some experiments. Small sample sizes, inconsistent dosing protocols, and limited independent replication are widely noted limitations, so the strength of the clinical evidence remains an open question.
Semax 是一种人工合成的七肽，氨基酸序列为 Met-Glu-His-Phe-Pro-Gly-Pro，单字母缩写记作 MEHFPGP。它被归类为促肾上腺皮质激素片段 ACTH(4-10) 的结构类似物，但并不天然存在于生物体内。母体片段 ACTH(4-10) 的序列为 Met-Glu-His-Phe-Arg-Trp-Gly，Semax 替换了中间两个残基，并在羧基端延长了 Pro-Gly-Pro 三肽。这种延长被普遍认为能提升分子对肽酶的耐受性。
该化合物于二十世纪八十年代在俄罗斯被开发，相关工作由俄罗斯科学院分子遗传学研究所的研究团队主导。开发目标并非复制 ACTH 的完整激素活性，而是寻找保留其神经作用方向、同时去除促肾上腺皮质激素释放效应的短肽片段。研究记录显示，这一方向促成了多个相关短肽的合成与筛选，而 Semax 是其中被研究最广泛的一个。当地文献常以 Семакс 这一名称指代它。
Semax is a synthetic heptapeptide whose sequence is Met-Glu-His-Phe-Pro-Gly-Pro. It was developed as a fragment analog of adrenocorticotropic hormone, modeled specifically on the ACTH(4-10) region. The first four residues reproduce that fragment, while a Pro-Gly-Pro tripeptide is appended at the C-terminus. Work on the compound originated in Russia, where it entered clinical use as an intranasal preparation. Its sequence places it among short regulatory peptides studied for effects on the central nervous system rather than on the adrenal axis.
The C-terminal Pro-Gly-Pro extension is not incidental. Proline-rich tails are known to resist several common peptidases, and the published literature attributes the longer half-life of Semax, relative to unmodified ACTH fragments, to this feature. The modification also removes the melanocyte-stimulating and corticosteroidogenic activity that characterizes longer ACTH-derived sequences. Because the molecule is small and hydrophilic, it is typically formulated as an aqueous solution for intranasal or parenteral delivery. Acetylation or amidation at the termini appears in closely related research peptides and shifts the mass by a fixed increment.
Smuts informed the General Assembly that it had already been so thoroughly incorporated with South Africa a UN-sanctioned annexation was no more than a necessary formality. The Smuts delegation's request for the termination of the mandate and permission to annex South West Africa was not well received by the General Assembly. Five other countries, including three major colonial powers, had agreed to place their mandates under the trusteeship of the UN, at least in principle; South Africa alone refused. Most delegates insisted it was undesirable to endorse the annexation of a mandated territory, especially when all of the others had entered trusteeship. Thirty-seven member states voted to block a South African annexation of South West Africa; nine abstained. In Pretoria, right-wing politicians reacted with outrage at what they perceived as unwarranted UN interference in the South West Africa affair. The National Party dismissed the UN as unfit to meddle with South Africa's policies or discuss its administration of the mandate. One National Party speaker, Eric Louw, demanded that South West Africa be annexed unilaterally. During the South African general election, 1948, the National Party was swept into power, newly appointed Prime Minister Daniel Malan prepared to adopt a more aggressive stance concerning annexation, and Louw was named ambassador to the UN. During an address in Windhoek, Malan reiterated his party's position that South Africa would annex the mandate before surrendering it to an international trusteeship.
=== Future Outlooks of DNA Legos === DNA Legos have promising applications in drug encapsulation and intracellular delivery. DNA nanoparticles are created to have reactive groups with two pegs in a singular direction and two holes in another . This structure allows the bricks to connect and create various shapes. The shapes of the bricks can become complex to encapsulate various drug molecules. These shapes have been applied in an attempt to improve cancer immunotherapies. For example, DNA Legos have been formed into a star shape with sticky ends to encapsulate doxorubicin. When mixed in solution the sticky ends rapidly join together forming an icosahedron shaped brick with the anticancer drug inside of this structure. Another study investigated cellular uptake of spherical nucleic acid bricks (SNAs). Through SNA and dendritic cell interactions, tumor cells are efficiently killed as the spherical brick shape allows for tunable subcellular trafficking and peptide retention. Thus, creating various shaped DNA brick nanoparticles may improve efficacy of immunotherapies by encapsulating drug cargo improving cell uptake. Before DNA Legos can have clinical applicability as a nanoparticle, they must be stabilized to ensure proper drug release. Previously, RNA bricks have been locked in place by magnesium. Utilizing magnesium to set the shape of RNA bricks via kissing interactions allows for easy tunability of structures. This idea is easily translatable to DNA thus creating a mechanism in which DNA Legos can be stabilized for clinical use.
False positive readings can be due to various causes: liver disease, high rheumatoid factor, inflammation, malignancy, trauma, pregnancy, recent surgery as well as advanced age. False negative readings can occur if the sample is taken either too early after thrombus formation or if testing is delayed for several days. Additionally, the presence of anti-coagulation can render the test negative because it prevents thrombus extension. The anti-coagulation medications dabigatran and rivaroxaban decrease D-dimer levels but do not interfere with the D-dimer assay. False values may be obtained if the specimen collection tube is not sufficiently filled (false low value if underfilled and false high value if overfilled). This is due to the dilutional effect of the anticoagulant (the blood must be collected in a 9:1 blood to anticoagulant ratio). Likelihood ratios are derived from sensitivity and specificity to adjust pretest probability. Elevated plasma D-dimer levels following ICH serve as an independent risk factor for poor functional outcomes and mortality. In interpretation of the D-dimer, a value above 500 μg/L is considered abnormal. Since 2001 there have been numerous studies that show for patients over age 50, a value of (patient's age) × 10 μg/L may be abnormal; this has been validated in multiple different D-dimer assays. This has now been incorporated in clinical practice guidelines.
Sources: en.wikipedia.org
The iron storage disorder hereditary hemochromatosis (HHC) is an autosomal recessive genetic disorder that usually results from defects in this gene. The disease-causing genetic variant most commonly associated with hemochromatosis is p. C282Y. About 1/200 of people of Northern European origin have two copies of this variant; they, particularly males, are at high risk of developing hemochromatosis. This variant may also be one of the factors modifying Wilson's disease phenotype, making the symptoms of the disease appear earlier. Allele frequencies of HFE C282Y in ethnically diverse western European white populations are 5-14% and in North American non-Hispanic whites are 6-7%. C282Y exists as a polymorphism only in Western European white and derivative populations, although C282Y may have arisen independently in non-whites outside Europe. HFE H63D is cosmopolitan but occurs with greatest frequency in individuals of European descent. Allele frequencies of H63D in ethnically diverse western European populations are 10-29%. and in North American non-Hispanic whites are 14-15%. At least 42 mutations involving HFE introns and exons have been discovered, most of them in persons with hemochromatosis or their family members. Most of these mutations are rare. Many of the mutations cause or probably cause hemochromatosis phenotypes, often in compound heterozygosity with HFE C282Y. Other mutations are either synonymous or their effect on iron phenotypes, if any, has not been demonstrated.
=== Franchises in Israeli settlements === Further controversies have occurred during the company's expansion in the Middle East. The opening of a Burger King location in Ma'aleh Adumim, an Israeli settlement in the Israeli-occupied Palestinian territories, led to a breach of contract dispute between Burger King and its Israeli franchise due to the hotly contested international dispute over the legality of Israeli settlements in the Palestinian territories in accordance to international law. The controversy eventually erupted into a geopolitical dispute involving Muslim and Jewish groups on multiple continents over the application of, and adherence to, international law. The case eventually elicited reactions from the members of the 22-nation Arab League. The Islamic countries within the League made a joint threat to the company of legal sanctions, including the revocation of Burger King's business licenses within the member states' territories.
=== Immune system === Inflammation has been suggested to have a role in the pathogenesis of fibromyalgia. People with fibromyalgia tend to have higher levels of inflammatory cytokines IL-6, and IL-8. There are also increased levels of the pro-inflammatory cytokines IL-1 receptor antagonist. Increased levels of pro-inflammatory cytokines may increase sensitivity to pain, and contribute to mood problems. Anti-inflammatory interleukins such as IL-10 have also been associated with fibromyalgia. Neurogenic inflammation has been proposed as a contributing factor to fibromyalgia. A repeated observation shows that autoimmunity triggers, such as traumas and infections, are among the most frequent events preceding the onset of fibromyalgia. A 2024 discussion concluded that the complexity of FM may mean both autoimmune and non-autoimmune mechanisms occur in FM, possibly in different subgroups of FM.
Sources: en.wikipedia.org
不存在。它是依据 ACTH 的一段序列人工设计的分子，天然蛋白质中找不到与之完全相同的七肽。名称属于研究代号，而非天然物质名。
Semax 对应 ACTH 第 4 至第 10 位的片段，并在两端做了替换与延长，使其不再具备促肾上腺皮质激素的典型内分泌活性。这一改动同时改变了它在体内的稳定性与分布特征。
俄罗斯将其列为处方药物，需要医生开具处方。多数其他国家把它当作研究化合物，不能作为药品销售或宣称疗效。具体合法性取决于当地法规。
Registered medical products are most often 0.1% nasal drops. Research suppliers ship lyophilized powder, usually in milligram quantities, which is dissolved before use. The active peptide is the same in both cases; presentation and excipients differ.