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Please cite this article as follows: Heidari Beigvand H, Razzaghi M, Rostami-Nejad M, Rezaei-Tavirani M, Safari S, Rezaei-Tavirani M.
Assessment of laser effects on skin rejuvenation. J Lasers Med Sci. 2020;11(2):212-219. doi:10.34172/jlms.2020.35.
Review Article
doi 10.34172/jlms.2020.35
Assessment of Laser Effects on Skin Rejuvenation
Hazhir Heidari Beigvand1, Mohammadreza Razzaghi2, Mohammad Rostami-Nejad3, Majid Rezaei-Tavirani1,
Saeed Safari4, Mostafa Rezaei-Tavirani5*, Vahid Mansouri5, Mohammad Hossein Heidari5
1Firoozabadi Hospital, Faculty of Medicine, Iran University of Medical Sciences, Tehran, Iran
2Laser Application in Medical Sciences Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
3Gastroenterology and Liver Diseases Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid
Beheshti University of Medical Sciences, Tehran, Iran
4Proteomics Research Center, Department of Emergency Medicine, Shahid Beheshti University of Medical Sciences, Tehran,
Iran
5Proteomics Research Center, Faculty of Paramedical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
Abstract
Laser skin resurfacing has changed the approach of facial skin rejuvenation over the past decade.
This article evaluates the laser effects on skin rejuvenation by the assessment of laser characteristics
and histological and molecular changes, accompanied by the expression of proteins during and
after laser-assisted rejuvenation of skin. It is important to note that different layers of skin with
different cells are normally exposed to the sun’s UV radiation which is the most likely factor in
aging and damaging healthy skin. To identify the expression of proteins, using validated databases
and reviewing existing data could reveal altered proteins which could be analyzed and mapped to
investigate their expression and their different effects on cell biological responses. In this regard,
proteomics data can be used for better investigation of the changes in the proteomic profile of
the treated skin. Different assessments have revealed the survival and activation of fibroblasts and
new keratinocytes with an increase of collagen and elastin fibers in the dermis and the reduction
of matrix metalloproteinases (MMPs) and heat shock proteins (HSPs) as a result of different low-
power laser therapies of skin. There are a wide range of biological effects associated with laser
application in skin rejuvenation; therefore, more safety considerations should be regarded in the
application of lasers in skin rejuvenation.
Keywords: Rejuvenation; Scars; Laser; Skin aging; Laser therapy.
*Correspondence to
Mostafa Rezaei-Tavirani,
Proteomics Research Center
(PRC), Darband St., Qods Sq.,
Tehran, Iran.
Tel: +982122714248;
Email: tavirany@yahoo.com
Published online March 15,
2020
Journal of
Lasers
in Medical Sciences
J Lasers Med Sci 2020 Spring;11(2):212-219
http://journals.sbmu.ac.ir/jlms
Introduction
Laser applications in medicine have been promoted
in different fields such as dermatology, dentistry,
ophthalmology, and surgery.1-4 There are many
documents about the widespread use of lasers in skin
treatment, especially in skin rejuvenation.5-7 Skin aging
is a natural process that occurs as people age. However,
it could be accelerated by such factors as sunlight, stress,
and chemicals. Skin aging is affected by numerous
genetic and environmental factors that can appear as
wrinkles, abnormal pigmentation, skin weakness, and
telangiectasia.8 Researchers are increasingly looking for
different ways to rejuvenate skin. Recently, the use of laser
radiation for skin rejuvenation has become commonplace
and has apparently been effective. The expansion and
application of lasers and light for medical procedures
based on the selective principle of photothermolysis have
increased exponentially over the past two decades. The
fundamental principle of this procedure is that selective
heating is attained by preferential laser light absorption
and heat manufacture in the target chromophore, with
heat being localized to the target by pulse duration shorter
than the thermal relaxation time of tissue.9 This study
examines the effect of the laser beam on skin rejuvenation
in different aspects and reviews the published articles in
this field to present a new perspective of laser application
in skin rejuvenation. The study includes the research
method, skin aging phenomena, skin photoaging
histology, skin aging treatment, laser features and skin
aging treatment, ablative lasers, nonablative lasers,
fractional lasers, Photobiomodulation (PBM) lasers, laser
effects on tissues, photothermolysis, molecular aspects of
laser effects in cell biology, and conclusion parts.
Methods
The search engines of Scopus, Google Scholar, and
PubMed were applied to search such keywords as
“Skin”, Laser therapy”, “Rejuvenation”, “Skin Aged”,
Journal of Lasers in Medical Sciences Volume 11, Number 2, Spring 2020 213
Laser Effects on Skin Rejuvenation
and “Proteomics”. The titles in English were identified
and studied in such a way that the relevant articles
were selected for more evaluation and assessment. The
abstracts of 155 documents were investigated and the full
texts of 134 articles were selected. After the review of 134
articles, 84 documents were chosen to be included in this
st udy.
Skin Aging Phenomena
The clinical signs of skin aging include thinning skin,
cigarette paper-like wrinkles, elasticity loss, and benign
overgrowth or vascular formations such as keratosis or
angioma.10 These clinical signs appear by genetic factors
of aging. UV irradiation induces photoaging and gravity,
leading to ECM matrix changing to appear wrinkles.
Therefore, these aging processes are accompanied by
the phenotypic exchange in cutaneous cells as well as
structural and functional changes in extracellular matrix
components such as collagen, elastin, and proteoglycans,
which are necessary to provide tensile strength, elasticity,
and hydration to skin respectively.11 Also, they cause laxity
and fragility of skin with reduced collagen syntheses and
enzymatic degradation.12 The degree of skin photoaging
could be classified by Fitzpatrick skin types I to IV
according to its severity from few wrinkles to deep
wrinkles. We should also mention the vascular pattern
changes as telangiectasia.13
Skin Photoaging Histology
The chronology of histological change in skin aging
indicates that events such as epidermal atrophy and
reduced collagen amount and fibroblasts of dermis along
with the epidermal atrophy, mainly with regards to the
spinosum layer of epidermis according to prolonged
cell cycles are happened.14 The number of melanocytes
and Langerhans cells decreases per decade after the
age of thirty.15 Subsequently, the amount of collagen
and elastic fibers and also fibroblasts decreases in
chronologically aged skin compared to younger skin.16,17
In postmenopausal subjects, collagen synthesis is reduced
by 30%.18 However, the heterogeneity and thickness
alteration of epidermis in photoaging are reported.19 An
increase in melanocytes and different keratinocytes and
the regulation of the expression of free radicals are other
consequences of photoaging histology.20 It can be generally
stated that changes in the aged skin occur in the dermis
and between the epidermis and the dermis. It leads to the
accumulation of glycosaminoglycans and proteoglycans
in the area. However, it may be due to the accumulation
of metalloproteinases in hypertrophic fibroblasts and it is
in contrast to the photoaged skin in which the number
of inflammatory cells such as eosinophils, mast cells,
and other mononuclear cells increases.21,22 Wrinkle
formation may cause a reduction in collagen fibers.
Mostly prominent histological feature of skin photoaging
is the accumulation of elastic amorphous fibers and also
thicked fibers in dermis named Solar Elastosis.23
Several biological pathways and risk factors
related to skin aging are determined as; telomerase
shortening,24,25 Matrix metalloproteinases (MMPs), signal
transduction,26,27 oxidative stress,28,29 vascular alterations,30
cytokines alterations31 and UV radiation.32
Skin Aging Treatments
Skin aging is affected by various factors including
genetics, environmental exposure (UV, xenobiotics and
mechanical stress), hormonal changes, and metabolic
processes (production of reactive chemicals such as
reactive oxygen species, sugars, and aldehydes). All
factors work together to transform the skin, its function
and appearance. However, solar UV is undoubtedly a
major factor responsible for skin aging. Skin aging may
cause psychological side effects, leading patients to seek
a suitable solution.33 Public desire to look good and
young is inevitable and more than 8 million cosmetic
treatments were performed in the United States in 2017.34
The treatment of photoaged skin may be classified into
two categories: one is the removal of pigmentation,
erythema, irregular vessels, and sebaceous changes and
the other one is the improvement of skin senescence.35
The process of skin rejuvenation has been associated
with aggressive elements such as peeling in the past, but
in recent years the demand for non-invasive treatment
of skin rejuvenation has increased dramatically. Public
demand for faster healing treatments with better natural
state maintenance has increased, leading to a shift in skin
rejuvenation techniques at public requests.
Laser Features and Skin Aging Treatment
One of the techniques for rejuvenating the skin is to use
lasers and other light beams. Lasers have been used for skin
rejuvenation since 1980.36 Different wavelengths of lasers
have been used to treat skin aging (see Table 1). The use
of high-power lasers and skin peeling by heat generation
is one of the methods for skin rejuvenation. Since this
process is accompanied with side effect; the adjacent
damaged tissues recover with the same mechanism of
wound healing, but recently the use of low-power lasers
has become commercial. Different types of lasers for skin
rejuvenation are ablative lasers, non-ablative lasers, and
fractional lasers (Figure 1).
Ablative Lasers
These kinds of lasers have been used to treat scars,
pigmentations, and rhytides by removing the epidermis
and heating dermis (Table 2). Ablative lasers are generally
used for skin resurfacing and rejuvenation.39 Ablative
lasers evaporate tissue and hence are more aggressive,
in contrast with the mild non-ablative lasers that leave
the skin intact. However, ablative lasers reduce time of
treatment and cause a more difficult recovery process,
they stay the lasers that create the most dramatic
Heidari Beigvand et al
Journal of Lasers in Medical Sciences Volume 11, Number 2, Spring 2020214
impressive. For severe facial wrinkles, pigmentation, and
skin challenges, ablative lasers are often the preferred
treatment.33 Non-ablative lasers penetrate into the dermis
and heat the dermis without heating epidermis. These
types of lasers denature dermis proteins such as collagen,
and stimulate collagen synthesis and finally tighten the
skin bed (Figure 2).39 The most common ablative lasers
used for skin rejuvenation are CO2, erbium-doped
yttrium aluminium garnet (Er:YAG), and erbium doped
yttrium scandium gallium garnet.
Non-ablative Lasers
Non-ablative laser resurfacing demonstrates one of the
main developments in procedural dermatology over the
past decade and has become the treatment of selection
for a broad range of aesthetic indications. However,
Table 1. Two Types of Lasers With Different Wavelengths Used for Skin
Rejuvenation37.38
Laser
Wavelength
Type 1(Vascular or
Pigment Treatment)
Type 2 (Skin
Rejuvenation)
Special
Targeting
532 nm * General
585 nm * General
595 nm * General
755 nm * General
800 nm * General
1064 nm * General
Intense pulsed
light lasers * General
1320 nm * Target water
1450 nm * Target water
1540 nm * Target water
Pulse dye lasers * Target
oxyhemoglobin
Skin rejuvenation
Ablative lasers
Non-ablative
lasers
Fractional lasers
Figure 1. Different Types of Lasers Involved in Skin Rejuvenation.
Table 2. The Characteristics of 3 Types of Lasers Used for Skin Rejuvenation: Er:YAG, Er:DYSGG, PPTP and Nd:YAG51,52
Type of Laser Source of Laser Wavelength Action
Ablative lasers
CO2
Er:YAG
10600 nm
2940 nm
2790 nm
Thermally ablate and vaporize epidermis & upper region of dermis
Non-ablative
Lasers
ILP,
High dose PDL
Low dose PDL
PPTP
Nd:YAG
Diode Lasers
Erbium glass lasers
Alexandrite lasers
500-1299 nm
585-595 nm
589-598 nm
532 nm
1032 & 1064 nm
1450 nm
1540 nm
Tighten the skin by collagen synthesis stimulating by the wound
healing process. Less destructive than ablative lasers. Heat dermis.
Fractional lasers
Ablative
Non-ablative
Er:YAG
Co2
Erbium glass
2940 nm
10600 nm
1540,1550 nm
1440,1540,1550,1556 nm
1440-1540-1550-1556 nm
Create columns of beam at the depth of skin without injuries to
spaces between columns. Ablative fractional heat epidermis & upper
dermis. Columns of Non-ablative fractional lasers heat deep dermis
columns
PBM LEDs, lasers, broad
lights waves Red & Near infra-red wavelengths Treat with no thermal reactions as photophysical or photochemical
reaction
Abbreviations: Er:YAG,erbium: yttrium aluminum-garnet; Er:DYSGG, erbium-doped yttrium scandium gallium garnet; PPTP, pulsed potassium titanyl phosphate;
Nd:YAG, neodymium-doped yttrium aluminum garnet; PBM, photobiomodulation; ILP, intense pulsed light; PDL, pulsed dye laser.
safety concerns related to their use in darker skin types
have remained.40 These lasers are less destructive than
ablative lasers and stiffen the skin by stimulating collagen
production in the dermis; the epidermis is protected
through skin cooling. This type of laser is less aggressive
than the optical laser and due to the stimulation of
collagen in the dermis, it makes the skin firm (Table 2).
The epidermis remains cool when using this laser because
the waves penetrate the dermis layer. The heat generated
in the dermis coagulates the collagen and then begins the
wound healing process. As a result, new collagen synthesis
is performed on the substrate of the skin and extracellular
matrix.41 The side effects of these lasers, such as scars and
infections, have decreased42; however, the efficiency of
non-ablative lasers is less than ablative ones and they have
been used for patients with moderate photoaging.43
Fractional Lasers
Fractional lasers including non-ablative and ablative
fractional lasers generally provide columns at the depth
of 1 and 2.5 mm into the skin, respectively.34 Non-ablative
lasers influence dermis and leave epidermis with no
Journal of Lasers in Medical Sciences Volume 11, Number 2, Spring 2020 215
Laser Effects on Skin Rejuvenation
effects (Table 2). A comparison between the action of
fractional ablative lasers and that of non-ablative ones
on facial skin revealed clinical improvements in both
techniques; however, collagen and elastin formation and
edema in skin treated by the ablative fractional erbium
laser were more than non-ablative one.44
Lasers resurfacing of skin as peeling could remove fine
wrinkles of skin although, however potentially have the
advantages to treat deep wrinkles by collagen making
stimulation.45 Skin healing in deep peeling and laser
resurfacing is known as like wound healing mechanism
and depends on the depth of the lesion.46
Photobiomodulation Lasers
PBMs lasers mainly utilize red and near-red light spectra
to activate biological processes used in a wide range of
medical applications (Table 2). Low-power sources as
LEDs, broadband lights and lasers are the sources of
the photochemical and photophysical phenomenon
without thermal reactions.47 Photon energy is converted
to stimulate biological reactions as collagen synthesis.48
Near-infrared irradiation assists fibroblasts in making
collagen to increase the consistency of skin.49 The PBM
technique without thermal reactions has been able to
dramatically increase patients’ satisfaction with skin
rejuvenation.50
Laser Effects on Tissues
Laser–skin interaction can be categorized as:
photochemical, photothermal and photoplasmal
pheromones. Photochemical reactions happen when the
energy of photons made by the laser in the molecules
of the cells causes chemical reactions in the molecules
without changes in temperature.53 In photothermal
reaction, photon energy absorbed in a cell and converted
to heat causes an increase in the temperature of the cell,
associated with denaturation and necrosis.53 Photoplasmal
reaction occurs when irradiance energy is high enough
(108 or 109 w/cm) to form plasma accompanied by high
electric fields, dielectric reactions, shock waves, and tissue
rupture.54
Figure 2. Penetration of Different Lasers Into the Skin for Rejuvenation (A)
Ablative; (B) Non-ablative; (C) Fractional lasers.39
Photothermolysis
This is a technique that targets tissue in a specific area
without damaging other neighbor tissues. Different
chromophores such as oxyhemoglobin, melanin,
water, tattoos absorb different wavelengths.34 Longer
wavelengths can penetrate in deeper parts of skin.
Chromophores absorb photon energy to heat and
destroy targets; however, surrounding tissues need to be
cool (Thermal relaxation time). For example, the target
tissue cooling time is 3 to 10 ms for the epidermis and
1 µs for melanosomes.39 Thus the properties of radiation
and relaxation time between the periods of radiation are
important for skin rejuvenation.55
Molecular Aspects of Laser Effects in Cell Biology
Several factors are proposed to illustrate the molecular
basis for skin aging, including the theory of cellular
senescence, decrease in cellular DNA repair capacity
and loss of telomeres, point mutations of extranuclear
mitochondrial DNA, oxidative stress, increased frequency
of chromosomal abnormalities, single-gene mutations,
reduced sugar, chronic inflammation, and so on.56 Some
scientists have argued that most influences are caused by
extrinsic factors and that only 3% of aging factors have
an intrinsic background.57 Researches have demonstrated
that low-power laser therapy can deliver lower energy
to the tissues.58 The energy of low-power laser therapy
could be absorbed by mitochondria and cytochrome C.59
The energy of the red-NIR (Near-infrared) laser could
primarily be absorbed by mammalian cells cytochrome
C oxidase.60 Excited electrons in cytochrome C oxidase
lead to more electron transfer and subsequently more
ATP production.61 Investigations have revealed that NO
can inhibit cytochrome C oxidase activation;62 on the
other hand, low-power lasers can inhibit NO activity,
resulting in more oxidative activities of the cells.62,63
More activation of the cells causes more production of
ROS.62,64 It is considered that ROS displays a necessary
role in dermal extracellular matrix alterations of both
intrinsic aging and photoaging. ROS can be made from
various sources including the mitochondrial electron
transport chain, peroxisomal and endoplasmic reticulum
localized proteins, the Fenton reaction, and such enzymes
as cyclooxygenases, lipoxygenases, xanthine oxidases,
and nicotinamide-adenine dinucleotide phosphate
oxidases. Low-power lasers are useful for the treatment
of skin disorders like wrinkles, scars, and burns because
low-power lasers could positively affect cell proliferation
and remodeling, DNA repairing, ion channels, and
membrane potentials.65-67 Low-power lasers could change
the expression of different genes as the Er:YAG laser
upregulates the expression of IL1B, IL8, keratin16, MMP3,
and MMP1.68 In this regard collagen synthesis increases.
Picosecond infrared laser application leads to a reduction
in neighbor’s tissue damage, a decrease in beta-catenin
Heidari Beigvand et al
Journal of Lasers in Medical Sciences Volume 11, Number 2, Spring 2020216
and TGF b signaling, and more cell viability to accelerate
the wound healing process.69 Ablative CO2 resurfacing
skin revealed the upregulation of different MMPs.70 In
a large-scale study of skin aging and skin rejuvenation
proteins, proteomics is efficient. Proteomics has less
technical limitations on protein identification and a large
number of proteins could be identified by this technique.71
Proteomic analysis of foot skin compared to breast skin
demonstrated the presence of 50 ECM common proteins
in both skins, but there was a difference between the
expressions of tenascin-x in breast skin and serum amyloid
p component in foot skin.72 By examining the proteomic
profile of elderly epidermis, it was found that interferon-
stimulating polypeptides expression increased, causing
the stimulation of phosphatidylinositol 3-kinase and
manganese superoxide dismutase.73 The skin irritation
proteomics approach demonstrated the upregulation of
HSP27 and suggested it as the skin irritation marker.74
Laser skin proteomics evaluation suggested a balance
between skin cancer and laser irradiation.75 Aging leads to
a reduction in skin collagen and elastic fibers with MMPs
upregulation; however, UV causes skin aging effectively.76,77
A study on mouse skin exposure to the Er:YAG laser
revealed skin water epidermal loss and the upregulation
of p21 & p53 to repair DNA and skin survival.78 Low-
power laser therapy could downregulate the expression
of cytokeratin and antigens related to proliferation.79,80
Proteomics assay revealed the downregulation of Rho
GDI 1 expression following by low-power laser therapy
and the adjustment of Rho protein activities could disrupt
actin cytoskeleton and kill keratinocytes following by
new keratinocytes migration to replace the old ones.81
Laser therapy could reduce HSP26 protein and cause
surface cell death of skin after 24 hours of treatment.81 In
one study, low-level Er:YAG laser irradiation to gingival
fibroblast cells caused galectin 7 wound healing protein
upregulation and suggested reduced cell proliferation
after laser therapy in gingival fibroblast cells.82 Lee et al
reported the long-pulsed 1064-nm neodymium-doped
(Nd): YAG laser treatment of mouse skin. The results
of their study indicated an increase in collagen and
TGF-B and decreased expression of MMPs.83 Findings
from a study by De Filippis et al revealed an interaction
between keratinocytes and fibroblast and overexpression
of filaggrin, aquaporin, TGase, HSP70 with a reduction in
MMP-1 and an increase in elastin and procollagen type1
with the use of the 1064 nm Nd:YAG non-ablative laser.84
It can be generally assumed that non-invasive lasers are
effective in enhancing the activity of fibroblasts and
keratinocytes with the synthesis of collagen, elastin, and
decreased expression of some metalloproteinases.
Conclusion
As the assessment of skin rejuvenation and laser therapy
demonstrated, many proteins related to collagen
synthesis, fibroblasts and keratinocytes proliferation,
and apoptosis activities were introduced. However, more
investigations into the proteomic and genomic analysis
are required to interpret laser effects on the molecular
biology of skin rejuvenation. It is recommended to
provide a comprehensive genetic and protein map which
will be suitable to find out different biological pathways
of laser traded skins to improve better ways to rejuvenate
aged skin because many proteins and genes are still
unknown. On the other hand, the improvement of lasers
for the treatment of different skins and sooner cooling
of skin layers is suggested. The wide range of biological
events which are accompanied by laser application in skin
rejuvenation implies that more safety points should be
considered in the therapeutic guidelines.
Ethical Considerations
Not applicable.
Conflict of Interests
The authors declare no conflict of interest.
Acknowledgment
Shahid Beheshti University of Medical Sciences supports
this research.
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