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Lipid synthesis

BiologicalProcess Biological Process

Lipid synthesis, in the context of biology, describes the coordinated set of metabolic pathways through which manufacture the , , and that form the ’s protective lipid matrix. Unlike most organs, the produces its own structural lipids essentially in isolation, independent of delivery, and does so with a compositional precision that determines how effectively the barrier performs. When this synthesis is impaired, whether by hormonal change, chronic stress, inflammation, or nutrient insufficiency, the structural consequences emerge progressively in the form of that topical supplementation alone struggles to fully compensate.

Three Pathways, One Outcome

The ceramide fraction, comprising around 50% of the lipid matrix, is produced through three converging routes. The de novo pathway initiates synthesis from scratch: (SPT), the rate-limiting enzyme, condenses and palmitate to produce the sphingoid backbone from which all ceramide subtypes originate. The sphingomyelinase pathway converts sphingomyelin, a membrane phospholipid, into ceramide via enzymatic hydrolysis, providing a fast-response reservoir for barrier needs. The salvage pathway recovers ceramide from degraded sphingolipids and regenerates it without starting from scratch, which is particularly important for sustaining the ultralong-chain acylceramide subtypes Cer[EOS] and Cer[EOP] that require both the elongase and ceramide synthase CERS3 in their production sequence. [4]

Cholesterol synthesis proceeds through the mevalonate pathway, regulated in keratinocytes by HMG- reductase, the same enzyme targeted by statin drugs systemically. Free fatty acid synthesis depends on synthase (FASN) and a family of elongases. What makes epidermal lipid synthesis distinctive is that all three classes, ceramides, cholesterol, and free fatty acids, are produced together in a coordinated fashion within differentiating keratinocytes and packaged into lamellar bodies for secretion into the extracellular space, where they assemble into the lamellar structures that give the barrier its function. The assembly step, not synthesis alone, determines the final architecture. [5]

The Regulatory Network

Skin lipid synthesis is governed by a transcription factor network centred on the peroxisome proliferator-activated receptors ( , PPARβ/δ, PPARγ) and the liver X receptor (LXR). PPARα activation specifically increases expression of SPT, long-chain acyl-CoA synthase, and HMG-CoA synthase simultaneously, meaning a single regulatory signal upregulates all three lipid classes in parallel. LXR is activated by oxysterols derived from cholesterol, creating a positive feedback loop in which adequate cholesterol availability sustains its own synthesis pathway. This coordinated regulation explains why barrier lipid production tends to decline in concert, and why approaches that support the regulatory network, rather than supplementing individual lipid classes, can be more efficiently restorative. [5]

has a direct role in ceramide metabolism that goes beyond its influence on generally. Treatment of primary human keratinocytes with oestradiol at physiological concentrations increased ceramide production measurably in vitro, whilst post-menopausal skin consistently shows shorter ceramide chain lengths, characteristic of reduced de novo SPT activity, alongside elevated sphingomyelin, indicative of reduced hydrolysis pathway activity. Both abnormalities are largely prevented by hormone replacement therapy. This makes perimenopause and menopause the most predictable clinical context for lipid synthesis impairment, distinct from other causes in both mechanism and management. [4]

directly suppresses the synthesis of ceramide and cholesterol, and research has demonstrated measurably delayed barrier recovery following , through precisely this mechanism. and , the cytokines elevated in atopic conditions, add a further layer of suppression by inhibiting ceramide synthesis pathways at the same time as disrupting barrier protein production.

The Circadian Repair Window

Lipid synthesis in healthy skin follows a . TEWL in healthy subjects decreases in the hours immediately before sleep, reflecting an upswing in nocturnal barrier repair activity in which lipid synthesis and play central roles. In atopic skin, this nocturnal repair window is disrupted: worsens in the evening rather than improving, consistent with the circadian desynchronisation of lipid synthesis gene expression seen in compromised skin. The practical implication for barrier repair protocols is clear: lipid-rich occlusive products applied in the evening work with this repair window rather than against it, and sleep deprivation directly shortens the period during which synthesis-driven repair can occur. [2]

Supporting Synthesis in Practice

Several routes to supporting lipid synthesis are clinically meaningful. upregulates all three lipid classes, ceramides, cholesterol, and free fatty acids, making it a useful daily synthesis-supporting active rather than purely a cosmetic ingredient. Fatty acids, including those from oat lipids and fish oil, activate PPAR pathways; oat oil has demonstrated dual PPARα/PPARβ agonist activity, with keratinocyte ceramide levels increasing by 70% in treated cells. At the professional treatment level, has demonstrated early upregulation of lipid metabolism gene expression in clinical responders, providing a route to stimulating synthesis from within the tissue rather than supplementing only from the surface.

For perimenopausal clients, the oestrogen-synthesis relationship is a useful framework for honest conversations about what topical approaches can and cannot achieve. Topical multi-ceramide formulations compensate at the structural level for reduced synthesis, but they do not restore synthesis itself. For some clients, that distinction is relevant to discussions with their GP about HRT, which research suggests does restore ceramide production toward pre-menopausal norms. [4]

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Clinical Application

At Creative Touch, a number of our professional treatments influence skin lipid synthesis, but they do so through distinct biological mechanisms. Understanding the difference matters, both for how we advise clients and for setting realistic expectations about what each treatment contributes to barrier and skin quality outcomes.

It is useful to think about these treatments in two categories: those that directly stimulate lipid synthesis by activating the keratinocyte differentiation and repair machinery, and those that restore the conditions for synthesis by reducing the inflammatory signalling that actively suppresses it.

Direct Synthesis Stimulation

Thulium fractional laser is the treatment with the most direct evidence for stimulating epidermal lipid synthesis specifically. Fractional ablation creates controlled micro-injury in the epidermis and upper , triggering a coordinated wound-healing cascade in which keratinocytes differentiate rapidly to replace the treated zone. It is during this differentiation phase that lamellar body production, ceramide synthesis, and lipid secretion into the extracellular matrix are at their most active. Early clinical responders show measurable upregulation of lipid metabolism gene expression, including the ceramide synthesis pathways, in the treated tissue. For clients with hormonally driven ceramide depletion, post-inflammatory barrier compromise, or chronic barrier thinning, this makes thulium fractional laser a meaningfully different category of treatment from one that simply improves skin texture or tone.

and share this direct synthesis mechanism through the needling component, which is worth separating from the radiofrequency element when discussing lipid effects specifically. Microneedle-induced micro-injury has been shown to increase expression of SPTLC3, the long-chain base subunit of serine palmitoyltransferase – the rate-limiting enzyme that initiates de novo ceramide biosynthesis from scratch – in reconstructed human skin models. Alongside this, treated tissue showed measurable increases in ceramide content, , and components. The radiofrequency energy in RF microneedling contributes meaningfully to the and remodelling in the dermis, and creates thermal injury that intensifies the wound-healing cascade overall. But the lipid synthesis benefit is primarily driven by the needling mechanism itself, which is why even non-RF microneedling produces barrier-relevant outcomes rather than skin-tightening outcomes alone. [3]

For clients where barrier repair is a primary goal alongside skin quality improvement, this means the microneedling family of treatments is doing more than many clients realise. The conversation about “needling for skin quality” and “ceramide topicals for the barrier” is, mechanistically speaking, partly the same conversation.

Restoring the Conditions for Synthesis

The ceramide synthesis pathways, particularly de novo synthesis via SPT and the fatty acid elongation pathway for acylceramides, are significantly suppressed by inflammatory cytokines – specifically IL-4 and IL-13, which are elevated in atopic, sensitised, and chronically inflamed skin. This is not a subtle effect: the inflammation is actively switching off the repair mechanism that the skin needs to rebuild what the inflammation has damaged. Treatments that resolve this cytokine-driven suppression do not stimulate synthesis directly, but they remove a significant brake on synthesis that topical ceramide products and homecare alone cannot address.

(CAP) acts on this pathway through (RONS), which modulate signalling and reduce the pro-inflammatory cytokine burden in sensitised tissue. It is worth being precise about the mechanism here: CAP at treatment doses also modifies existing lipid stoichiometry in the stratum corneum, altering bond composition in surface lipids. This is a direct chemical effect on barrier lipids, distinct from synthesis stimulation, and it is not straightforwardly beneficial in isolation. The evidence is clearest when CAP is used to resolve an inflammatory state that is driving chronic ceramide depletion, rather than as a standalone barrier-building tool. Used in this context, CAP contributes meaningfully to the recovery of natural synthesis capacity by resolving the signalling environment that was suppressing it. [1]

operate via adenosine A2A receptor activation, which modulates inflammatory signalling in sensitised and compromised tissue. The anti-inflammatory and tissue calming effects are well-documented, and in the context of skin that is producing inadequate ceramides because of chronic inflammatory cytokine activity, polynucleotide treatment can be understood as restoring the biosynthetic conditions for lipid synthesis to resume at normal levels. This is indirect, but it is mechanistically genuine. For clients whose barrier compromise is clearly inflammation-driven (reactive post-procedure skin, atopic-tendency skin, perimenopause-associated sensitivity), it can be an important part of a recovery protocol where the direct synthesis stimulators alone would be poorly tolerated.

Matching Treatment to Mechanism

These two categories are complementary rather than competitive, and the clinical decision is about which mechanism the client most needs at any given point in their skin health journey.

A client with atopic-tendency or currently inflamed, reactive skin will often need the inflammatory-barrier removal step first. Introducing thulium laser or RF microneedling into an inflamed barrier before the cytokine environment has calmed risks triggering wound-healing responses in tissue that cannot complete repair efficiently. Cold plasma or polynucleotides as a preparatory or parallel treatment creates the conditions in which synthesis-stimulating treatments can work as intended.

For perimenopausal clients with progressive ceramide depletion in skin that is not acutely inflamed, direct synthesis stimulators make sense earlier in the protocol, with barrier-support homecare providing the topical supplement layer that keeps the lamellar architecture maintained between treatment sessions.

Where barrier compromise is post-procedural, particularly following over-exfoliation or aggressive actives use, neither category of treatment is typically appropriate until the acute phase has resolved through a stripped-back homecare approach. The professional treatment decision comes once the repair cycle has stabilised.

This is why, at Creative Touch, we frame skin rejuvenation not as a set of interchangeable treatments for cosmetic improvement, but as an understanding of what your skin is currently producing, what it is failing to produce and why, and which professional intervention is best positioned to address that specific gap at this specific point in time.

References

  1. Bai F, Ran Y, Zhai S, et al. (2023). Cold Atmospheric Plasma: A Promising and Safe Therapeutic Strategy for Atopic Dermatitis. Int Arch Allergy Immunol, 184(12), 1184-1197 .

  2. Iwanaszko M, Waldeck N, Anafi R, et al. (2024). Circadian Rhythms in Skin Barrier Function in Atopic Dermatitis: A Pilot Study. J Biol Rhythms, 39(2), 208-214 .

  3. Sakuraba K, Kojima Y, Terahara T, et al. (2023). Non-invasive Microneedle Application Increases Ceramide and Natural Moisturizing Factors in a Reconstructed Human Skin Model. Biol Pharm Bull, 46(9), 1310-1315 .

  4. Unknown Author. PMC: PMC9755298.

  5. Unknown Author. PMC: PMC3117011.

Also Known As

  • lipid biosynthesis
  • lipid formation
  • lipogenesis

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Regulators & Triggers

  • this Inhibited by

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Related Topics

Ceramides ChemicalSubstance Cortisol MolecularEntity Rosacea MedicalCondition Filaggrin Protein Cold Atmospheric Plasma therapy MedicalTherapy LED therapy MedicalTherapy Stratum corneum AnatomicalStructure Skin barrier dysfunction MedicalCondition

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