1. Cells and Skin

The skin is composed of billions of cells, and all its functions—Barrier Protection, Moisture Retention, Damage Repair, Pigment Regulation, and Wrinkle Formation—are carried out by cells performing their respective roles. The skin condition we see with the naked eye is, in essence, the collective manifestation of the activities of these countless cells.

When cells are in a healthy state: ① Epidermal keratinocytes proliferate and differentiate in an orderly manner, maintaining an appropriate thickness of the stratum corneum to defend against external insults; ② Epidermal melanocytes respond to UV signals by synthesizing melanin in a controlled fashion and transferring it to keratinocytes, where it absorbs UV radiation, protects cellular DNA from photodamage, and maintains even skin tone; ③ Dermal fibroblasts efficiently synthesize collagen, elastin, and hyaluronic acid, providing structural support and hydration to the skin; ④ Dermal macrophages eliminate senescent cells, cellular debris, and invading microorganisms, secrete repair-related cytokines, regulate inflammation, and collaborate with fibroblasts in tissue remodeling.

True skincare is not a superficial touch-up, but an empowerment that reaches deep into the cells.

Every step we take is, at its core, about creating a better living environment for cells—equipping them with sufficient energy to function, maintaining an orderly rhythm for renewal, and ensuring timely clearance once they are no longer needed.

2. Main Cell Fates in Skin

What are the ultimate destinies of skin cells? Some, after fulfilling their final missions, choose a dignified and quiet demise—apoptosis. Others, having endured overwhelming stress, permanently cease division, becoming "living fossils"—senescent cells, also known as zombie cells. Still others, under intense inflammation, self-detonate—pyroptosis.

2.1 Cell Apoptosis

Cell Apoptosis, also known as programmed cell death (PCD), is a normal physiological process of cell death in living organisms.

Through apoptosis, cells that have lost biological activity or are no longer physiologically needed are eliminated from the body. It is an Active, Orderly, and Proactive process of cellular clearance.

Apoptotic cells exhibit shrinkage and rounding, cytoplasmic condensation, chromatin condensation and nuclear fragmentation, endoplasmic reticulum vesiculation, and membrane blebbing and invagination, ultimately forming apoptotic bodies. However, the cell membrane remains intact with no leakage of contents. The exposure of phosphatidylserine (PS) and N-acetylglucosamine residues on the membrane surface facilitates recognition and clearance by phagocytes.

2.2 Cellular Senescence

Cellular Senescence is a state triggered by intrinsic (telomere shortening, oxidative stress) or extrinsic (UV, air pollution, chemical irritants) stress signals, characterized by stable and irreversible cell cycle arrest. Senescent cells remain metabolically active but no longer proliferate—commonly known as "zombie cells."

In the skin, the accumulation of senescent cells triggers multiple cascading damages:

• Structural breakdown: Increased MMPs secretion degrades collagen and elastin fibers, leading to skin thinning, sagging, and deepening of wrinkles;

• Chronic inflammation: Sustained secretion of SASP (pro-inflammatory factors such as IL-6, IL-8, and TNF-α) drives inflammaging, further accelerating aging;

• Functional decline and pigment imbalance: Epidermal turnover slows down, barrier function weakens, and wound healing capacity diminishes; melanocyte dysfunction leads to hyperpigmentation and uneven skin tone.

More critically, senescent cells resist apoptosis, and their clearance efficiency declines progressively with age, forming a vicious cycle of "accumulation → inflammation → more senescence" that continuously erodes the skin's health reserve.

2.3 Cell Pyroptosis

Cell Pyroptosis is an inflammatory form of programmed cell death triggered by intense intrinsic (oxidative stress overload, mitochondrial damage) or extrinsic (severe UV radiation, high-concentration chemical irritants, physical trauma) stress signals, characterized by cell membrane pore formation and rupture.

During pyroptosis, cells release large amounts of pro-inflammatory cytokines (IL-1β, IL-18) and intracellular contents - a violent process of "active self-detonation and distress signaling," commonly referred to as "explosive cells."

In the skin, pyroptosis of skin cells results in:

• Acute inflammatory storm: Pyroptotic cells release abundant pro-inflammatory factors such as IL-1β and IL-18, rapidly recruiting neutrophils, macrophages, and other immune cells to aggregate at the site, leading to localized acute inflammatory responses including Redness, Burning, and Pain;

• Epidermal barrier collapse: When pyroptosis occurs, cell membrane rupture and content leakage disrupt the stratum corneum structure, dramatically weakening barrier function and significantly increasing transepidermal water loss (TEWL), leaving the skin Dry, Flaky, and Sensitive;

• Tissue damage and delayed repair: The membrane rupture and content leakage caused by pyroptosis inflict secondary damage on surrounding normal cells. The repair process is delayed by the inflammatory cycle, impairing wound healing capacity;

• Accelerated photoaging: UV irradiation can trigger keratinocyte pyroptosis. The released inflammatory factors not only directly damage tissues but also activate matrix metalloproteinases (MMPs) expression in adjacent fibroblasts, accelerating collagen degradation—thus synergizing with cellular senescence to drive skin photoaging.

3. Cell-Level Skincare Strategy

Among skin cells relevant to skincare, there are 4 major target cells, of which:

• Cells most vulnerable to Senescence:

Fibroblasts - affecting dermal firmness; Melanocytes - affecting pigmentation; Basal keratinocytes - slowing epidermal turnover, weakening barrier function, leading to rough and dull skin.

• Cells most vulnerable to pyroptosis:

Keratinocytes - when pyroptosis occurs, they release large amounts of inflammatory cytokines, causing barrier damage and skin redness and inflammation; Macrophages - as key immune regulators, can amplify skin inflammation when abnormally activated.

• Cells most dependent on programmed apoptosis:

Keratinocytes - ensure normal epidermal metabolism and orderly desquamation. 

Based on this, we have mapped out corresponding cell-level skincare strategies, such as:

• Deep anti-wrinkle: Delay fibroblast senescence, assist in clearing senescent cells, reduce SASP inflammatory factors, and maintain collagen and elastin synthesis;

• Brightening and spot correction: Alleviate melanocyte senescence stress, stabilize melanin synthesis and transfer, and improve pigmentation and uneven skin tone;

• Sensitive skin repair: Inhibit excessive keratinocyte pyroptosis, reduce inflammatory flare-ups, maintain normal programmed keratinocyte metabolism, and fortify the skin barrier.

4. UNIcare's Cell-Level Skincare Product Solution

UNIcare specializes in natural active ingredients and their cell-level mechanisms of action, developing a series of innovative products that promote cellular health, skin health, and longevity.

We’d like to introduce our latest product - UNIBIO_SALIDROSIDE (INCI: SALIDROSIDE) - a rare stress-resilient ingredient derived from Rhodiola rosea that supports the plant's survival in extreme environments. When applied in skincare, UNIBIO_SALIDROSIDE simultaneously Maintains Normal Apoptosis, Alleviates Cellular Senescence, and Inhibits Pyroptosis.

Our UNI_BAKUCHIOL (INCI: BAKUCHIOL) is a natural active substance derived from the seeds of Psoralea corylifolia L. with a structure similar to vitamin A. It is an effective alternative to retinol and has better skin tolerance than retinol and can be referred to as 'Plant Retinol'. It is the new generation of retinol. It can scavenges free radicals, boosts collagen synthesis and inhibits collagen degradation. It creates a favorable ECM environment for skin cells to help prevent cellular senescence.

Our another product UNIBIO_ADENOSINE (INCI: ADENOSINE) is a nucleoside active, it supports cellular DNA and protein synthesis, raises cellular ATP levels, and helps skin cells retain their viability under UV and external stimuli.

In addition, here is another exceptional product UNIBIO_ECTOIN (INCI: ECTOIN), it has a unique molecular structure---a protective Hydro-Complex around cells and then protect cells and the cell membrane, proteins and DNA,  and prevent external environmental pressure.

For further information on our products and samples, feel free to reach out to the UNIcare team.