Fibroblasts and keratinocytes are two of the major cell types that respond to the inflammatory phase in the cutaneous repair/regeneration process. Inflammatory signals activate the proliferation and maturation of these two cells types, which is essential for wound healing.

What are fibroblasts and what is their function?

A fibroblast is the most common type of cell found in connective tissue. Fibroblasts secrete collagen proteins that are used to maintain a structural framework for many tissues. They also play an important role in healing wounds.

Do fibroblasts produce keratin?

Through gene transfection studies, we have discovered that the forced expression of a foreign type II epidermal keratin in fibroblasts can trigger the expression of an endogenous type I epidermal keratin. Both the transfected and the induced proteins participate in the formation of filamentous structures.

What are fibroblasts?

Fibroblasts are the major cells responsible for the production of collagen, glycoaminoglycans, and proteoglycans, which are major components of the extracellular matrix.

In which layer of the integument do we find fibroblasts and keratinocytes?

The dermis is largely composed of connective tissue, but also contains hair follicles, sweat glands, and blood vessels. Dermal fibroblasts are largely found in the dermis, where they produce the connective tissue and extracellular matrix components that support the epidermis and contribute to wound healing.

What signaling proteins are produced by keratinocytes and fibroblasts?

Most studies in both physiological conditions and fibrosis demonstrated that keratinocytes stimulate fibroblasts through the production of interleukin 1, inducing keratinocyte growth factor (KGF) and metalloproteinases in the fibroblasts.

What do fibroblasts differentiate into?

As immature cells, fibroblasts can differentiate into other connective tissue cells, such as chondroblasts and osteoblasts. Human Dermal Fibroblasts (HDF, from Cell Applications) can also be converted into induced pluripotent stem cells (iPSC), a Nobel-prize awarded technology.

What is keratinocytes differentiation?

Differentiation of keratinocytes is critical for epidermal stratification and formation of a protective stratum corneum. It involves a series of complex processes leading through gradual changes in characteristics and functions of keratinocytes up to their programmed cell death via cornification.

How do keratinocytes produce keratin?

Keratinocytes proliferate in the basal layer of the epidermis and start differentiating on their way to the surface, undergoing gradual differentiation. During this process, they profoundly change their morphology and start to produce keratin, cytokines, growth factors, interleukins and complement factors.

Do fibroblasts differentiate?

In addition to differentiation into chondrocytic tissues, other studies have shown that fibroblasts are capable of differentiating into other types of cells.

What are keratinocytes?

Definition and Location. Keratinocytes represent the major cell type of the epidermis, the outermost of the layers of the skin, making up about 90 percent of the cells there. They originate in the deepest layer of the epidermis, the stratum basale and move up to the final barrier layer of the skin, the stratum corneum.