���发背景与监管地位 — 2026 Update

By Editorial Desk · published 2026-07-05 · last reviewed 2026-07-21 · Info

鼻内给药 is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.

Last reviewed on 2026-07-21. Where a claim depends on a specific study, the study is described rather than over-claimed.

研发背景与监管地位

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。

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。

Semax Background and Molecular Structure

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.

Reported pharmacological work centers on neurotrophic signaling, including changes in BDNF and NGF expression in hippocampal tissue in animal models. Human data come largely from studies conducted in Russia, and how well those results generalize to other populations remains an open question. Regulatory status differs sharply by jurisdiction: Semax is a registered prescription medicine in Russia, while it holds no approved marketing status in the United States or the European Union. Outside such jurisdictions it is generally handled as a research chemical, which affects both documentation and quality expectations.

Semax at a glance

Semax Structure and Research Background

Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. Its chain combines the first seven residues of corticotropin with a C-terminal proline-glycine-proline extension, a modification intended to slow enzymatic breakdown. The free peptide has a molecular mass near 813.9 daltons. It belongs to the class of ACTH-derived fragments studied for central nervous system activity rather than for adrenal steroid stimulation. This structural relationship to a natural hormone fragment is the usual starting point for describing the compound in the literature.

Development took place during the 1980s at institutes of the Russian Academy of Sciences, where peptide fragments of ACTH were screened for cognitive and neuroprotective effects. The compound received regulatory approval in Russia as a nasal preparation, marketed for conditions such as ischemic stroke, transient ischemic attacks, and optic nerve disorders. Registration in other countries has not followed. Most published clinical reports originate from a small number of Russian research groups, and independent replication outside that setting remains limited. The regulatory status therefore differs sharply between Russia and the rest of the world.

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Notes from published material

=== Mechanism of action === Dofetilide works by selectively blocking the rapid component of the delayed rectifier outward potassium current (IKr). This causes the refractory period of atrial tissue to increase, hence its effectiveness in the treatment of atrial fibrillation and atrial flutter. Dofetilide does not affect dV/dTmax (the slope of the upstroke of phase 0 depolarization), conduction velocity, or the resting membrane potential.

Weighted Companion Cubes are variants of Weighted Storage Cubes that are used in the testing chambers. They are differentiated from regular Storage Cubes with small pink hearts on its external surface, instead of an Aperture Science logo. In Portal, during test chamber 17, Chell is given a Weighted Companion Cube by GLaDOS, told by her that it will be her faithful companion for the duration of the test. Chell must use the Cube to complete the chamber, at which point GLaDOS requires her to incinerate the Cube before being able to progress further. The requirement to incinerate the companion cube originates from test-play of Portal, during which players brought their companion cube with them to later levels, with unexpected impact on game play. Another Companion Cube is seen at the end of the game, standing next to the cake. In Portal 2, redesigned Weighted Companion Cubes appear in test chamber 7 in chapter 2. GLaDOS fizzles two of them at the start of the test to annoy Chell. Chell is given the option to take a Weighted Companion Cube with her at the end of the test, but if Chell does this, GLaDOS fizzles the Companion Cube before Chell can enter the lift leading to the next test chamber. A Companion Cube with the old design, supposedly the one from Portal, appears at the very end of the game, as it is ejected, charred and singed, from the shed (possibly at ground level) shortly after Chell's departure. Companion Cubes are also mentioned a lot in the Ratman dens in Portal. In the Lab Rat comic, Ratman is also accompanied by a Companion Cube, which he imagines talks to him.

Insulin icodec is a medication used to enhance glycemic control in individuals with diabetes. It is an ultralong-acting basal insulin analogue developed by Novo Nordisk. The analog has a plasma half-life exceeding eight days, which is significantly longer than the 25-hour half-life of insulin degludec, the previously longest-acting insulin analogue. Insulin icodec functions as a once-weekly basal insulin.

Sources: en.wikipedia.org

Background from the literature

=== Microanatomy === The thymus consists of two lobes, merged in the middle, surrounded by a capsule that extends with blood vessels into the interior. The lobes consist of an outer cortex rich with cells and an inner less dense medulla. The lobes are divided into smaller lobules 0.5-2 mm in diameter, between which extrude radiating insertions from the capsule along septa. The cortex is mainly made up of thymocytes and epithelial cells. The thymocytes, immature T cells, are supported by a network of the finely-branched epithelial reticular cells, which is continuous with a similar network in the medulla. This network forms an adventitia to the blood vessels, which enter the cortex via septa near the junction with the medulla. Other cells are also present in the thymus, including macrophages, dendritic cells, and a small amount of B cells, neutrophils and eosinophils. In the medulla, the network of epithelial cells is coarser than in the cortex, and the lymphoid cells are relatively fewer in number. Concentric, nest-like bodies called Hassall's corpuscles (also called thymic corpuscles) are formed by aggregations of the medullary epithelial cells. These are concentric, layered whorls of epithelial cells that increase in number throughout life. They are the remains of the epithelial tubes, which grow out from the third pharyngeal pouch of the embryo to form the thymus.

It typically appears in the form of a white or brown powder. Treatment of heroin addiction often includes behavioral therapy and medications. Medications can include buprenorphine, methadone, or naltrexone. A heroin overdose may be treated with naloxone. As of 2015, an estimated 17 million people use opiates non-medically, of which heroin is the most common, and opioid use resulted in an estimated 109 thousand to 129 thousand deaths in 2015. The total number of heroin users worldwide is believed to have increased in Africa, the Americas, and Asia between 2000 and 2015. In the United States, approximately 1.6 percent of people reported using heroin at some point in their lives and 0.4% of people aged 12 or older in 2021 reported using heroin in the past 12 months. When people die from overdosing on a drug, the drug is usually an opioid and often heroin. Heroin was first made by C. R. Alder Wright in 1874 from morphine, a natural product of the opium poppy. Internationally, heroin is controlled under Schedules I and IV of the Single Convention on Narcotic Drugs, and it is generally illegal to make, possess, or sell without a license. About 448 tons of heroin were made in 2016. In 2015, Afghanistan produced about 66% of the world's opium. Illegal heroin is often mixed with other substances such as sugar, starch, caffeine, quinine, or other opioids like fentanyl.

Pressure ulcer – Also known as decubitus ulcers or bedsores, this type of wound is a result of chronic pressure to the skin over a prolonged period. While most individuals have intact sensation and motor function which allow for frequent positional change to prevent the formation of such ulcers, older individuals are particularly susceptible to this type of chronic injury due to impaired neurosensory responses. Pressure ulcers can occur in as little as two hours of immobility in a bedridden patient or person who is otherwise unconscious/sedated (surgery, syncope, etc.). In the United States, pressure ulcers are graded using the National Pressure Injury Advisory Panel (NPIAP) system. In this system, ulcers are graded on wound depth with stage 1 being the least severe (erythema, intact skin) and stage 4 being full thickness damage through subcutaneous tissue down to muscle, tendon, or bone. Any ulcer that cannot be assessed due to overlying eschar is considered unstageable.

Sources: en.wikipedia.org

Reference notes

The recent patent literature describes the synthesis of glycocyamine by catalytic oxidation of ethanolamine to glycine and subsequent reaction with cyanamide in aqueous solution in high yield, analogous to the synthesis of creatine starting from 2-methylaminoethanol via sarcosine.

"inability to reconcile the Allies' declared policy of self-determination with the Balfour Declaration, giving rise to a sense of betrayal and intense anxiety for their future"; "misapprehension of the true meaning of the Balfour Declaration and forgetfulness of the guarantees determined therein, due to the loose rhetoric of politicians and the exaggerated statements and writings of interested persons, chiefly Zionists"; and "Zionist indiscretion and aggression since the Balfour Declaration aggravating such fears". British public and government opinion became increasingly unfavourable to state support for Zionism; even Sykes had begun to change his views in late 1918. In February 1922 Churchill telegraphed Samuel, who had begun his role as High Commissioner for Palestine 18 months earlier, asking for cuts in expenditure and noting:In both Houses of Parliament there is growing movement of hostility, against Zionist policy in Palestine, which will be stimulated by recent Northcliffe articles. I do not attach undue importance to this movement, but it is increasingly difficult to meet the argument that it is unfair to ask the British taxpayer, already overwhelmed with taxation, to bear the cost of imposing on Palestine an unpopular policy. Following the issuance of the Churchill White Paper in June 1922, the House of Lords rejected a Palestine Mandate that incorporated the Balfour Declaration by 60 votes to 25, following a motion issued by Lord Islington.

In intracellular chemistry, sulfur operates as a carrier of reducing hydrogen and its electrons for cellular repair of oxidation. Reduced glutathione, a sulfur-containing tripeptide, is a reducing agent through its sulfhydryl (–SH) moiety derived from cysteine. Sulfur atoms may be catenated on the sulfhydryl groups of cysteine or glutathione to form a hydropersulfide (–SSH), which act as signaling molecules and donors of sulfur atoms in the biosynthesis of iron-sulfur clusters and some sulfur containing metabolites. Polysulfides and elemental sulfur are also known to exist in both prokaryotes and eukaryotes. Methanogenesis, the route to most of the world's methane, is a multistep biochemical transformation of carbon dioxide. This conversion requires several organosulfur cofactors. These include coenzyme M, CH3SCH2CH2SO−3, the immediate precursor to methane.

Sources: en.wikipedia.org

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