PRP for Stretch Marks: Evaluating Treatment Effectiveness

Striae distensae, colloquially known as stretch marks, constitute dermal disruptions that arise after the expeditious elongation of the skin. These are predominantly observed during pivotal biological milestones, including gestation, puberty-induced growth surges, and episodes of marked weight variations. Although devoid of medical exigency, the presence of striae distensae can precipitate considerable aesthetic concern, thereby undermining the psychosocial well-being and self-perception of the affected individuals.

This article aims to delineate the multifaceted causes of striae distensae, assimilating the contributory factors and the underlying biological mechanisms. Furthermore, it seeks to expound upon the genetic and racial predilections that modulate susceptibility to this condition, along with elucidating the psychological ramifications borne by patients.

Subsequent to establishing a foundational comprehension of striae distensae, this paper will pivot to an examination of the application of platelet-rich plasma (PRP) therapy as a therapeutic intervention for the amelioration of striae distensae [1], scrutinize existing research for its effectiveness, and outline areas requiring further investigation.

Understanding Stretch Marks: Causes and Risk Factors

A. Contributing Factors and Biological Mechanisms

The integumentary system, comprising the epidermis, dermis, and hypodermis, serves as the body's primary barrier against environmental stressors. The epidermis, the outermost layer, provides a waterproof barrier and creates skin tone. Beneath lies the dermis, rich in collagen and elastin fibers, which confer tensile strength and elasticity, respectively. The hypodermis, or subcutaneous layer of human skin, consists of fat and connective tissue that houses larger blood vessels and nerves.

Striae, or stretch marks, emerge as a result of rapid dermal stretching that exceeds the skin's capacity for elastic deformation, leading to microtears in the connective tissue. This phenomenon predominantly affects the dermis, where the disrupted architecture manifests as visible striations on the skin surface. Central to this process is the perturbation of collagen and elastin, crucial fibrous proteins that maintain dermal integrity and elasticity [2]. Exacerbating factors include hormonal fluctuations, notably during pregnancy, where elevated levels of hormones like cortisol may weaken dermal fibers [3].

B. Genetic and Racial Predispositions

Emerging evidence increasingly supports a genetic foundation for the predisposition to striae, intimately linked to polymorphisms in genes responsible for the synthesis and regulation of collagen and elastin. Genetic variations can lead to disparities in the quality and abundance of collagen and elastin, thus affecting an individual's susceptibility to stretch mark development [4]. Melanin production, another critical variable in this equation, offers photoprotection and may impact the appearance and recovery of stretch marks [5].

C. Psychological Impact on Patients

In some cases, the cosmetic concern associated with stretch marks transcends aesthetic displeasure, manifesting as significant mental health challenges, including anxiety and depression. For many individuals, these dermal lesions elicit distress, adversely impacting self-esteem, body image, and self-confidence [6].

PRP for Stretch Marks: Background

PRP therapy, a procedure that concentrates platelets from an individual's own blood to enhance tissue healing, has recently garnered attention in the realm of aesthetic medicine for its potential applicability to a variety of dermatological conditions, including the treatment of striae [7].

Mechanism of Action for Stretch Marks

• Increased Collagen and Elastin Production: PRP is thought to stimulate the proliferation of fibroblasts, which in turn enhances the synthesis of collagen and elastin fibers in the dermis [8].
• Enhanced Angiogenesis: The growth factors present in PRP can promote the formation of new blood vessels, improving blood supply to the affected areas [9].
• Improved Wound Healing: By leveraging the body's innate healing mechanisms, PRP may accelerate the repair of the microtears in the dermis that manifest as stretch marks [10].

Current Evidence on PRP for Stretch Marks

One study evaluated the effectiveness and safety of intralesional PRP injections versus topical tretinoin 0.05% in the treatment of striae distensae across 30 patients. The findings revealed a statistically significant improvement in SD appearance with both treatments, with PRP demonstrating a superior therapeutic response compared to tretinoin, as evidenced by increased collagen and elastin fibers in post-treatment biopsies and higher patient satisfaction scores [12].

Another study compared the efficacy and tolerability of PRP against microdermabrasion. In this randomized trial, 68 patients were divided into three groups. Histopathological evaluations indicated significant clinical improvement in patients treated with PRP and those receiving the combined treatment, compared to microdermabrasion alone [13].

Factors Influencing Treatment Outcomes

The effectiveness of PRP therapy for striae distensae is contingent upon factors including the severity and chronicity of the striae, with newer, red-tinged marks (striae rubra) often responding more favorably than older, white-tinged ones (striae alba). Treatment efficacy is also affected by the number of PRP sessions and the expertise with which they are administered [14].

Setting Realistic Expectations

Clear communication between healthcare providers and patients is paramount in setting realistic expectations for the effective treatment of striae distensae with PRP therapy. Medical professionals hold a pivotal role in elucidating the realistic outcomes of PRP treatment, emphasizing improvement in the appearance of the striae rather than promising complete eradication.

Potential Limitations and Risks

PRP therapy is marked by a scarcity of extensive, longitudinal clinical studies. While the instruments and protocols for PRP preparation have received clearance from regulatory entities, specific uses of PRP therapy lack explicit FDA endorsement [15]. Despite PRP's autologous origin, there remains a possibility for adverse effects.

SELPHYL® Disclaimer

Instructions for the use of SELPHYL® can be found here and here.

SELPHYL® has not been approved by the FDA for subcutaneous, submucous, or intradermal injections in aesthetic medicine, and the safety and effectiveness of SELPHYL® for these conditions have not been established.

SELPHYL® is designed to be used for the safe and rapid preparation of autologous platelet-rich plasma (PRP) from a small sample of peripheral blood at the patient's point of care. The PRP is mixed with autograft and/or allograft bone prior to application to a boney defect to improve handling characteristics.

As of the time of writing, SELPHYL® has no known serious, life-threatening, or fatal risks apart from the adverse reactions described above.

SELPHYL® Limitations, Restrictions, Cautions, and Warnings

• Prescription only.
• Do not use the kit if the sterile packaging is damaged or compromised.
• Follow universal safety precautions for blood collection and sharps disposal.
• During blood draw, failure to align and properly seat tubes in the tube holder can result in a loss of vacuum and a loss of blood draw.
• During PRP transfer, failure to align and securely seat tubes simultaneously in assembled blood transfer device tube holders can result in a loss of vacuum and the failure of PRP to transfer to the red-top PRFM tube.
• Do not initiate the transfer of PRP into the red-top PRFM tube until the physician is ready to complete the procedure.
• Do not reuse.

SELPHYL® Contraindications

These are not in FDA-required labeling and are part of SELPHYL®’s clinical evaluation for EU CE requirements.

• Direct connection to a patient’s vascular system of circulating blood volume.
• Other health conditions and diseases may also contraindicate the use of autologous PRP, including but not limited to low platelet count, sepsis, localized infection in the treatment area, anemia, malignancy with hematologic or bony involvement, and anticoagulation therapy.

Conclusion

PRP therapy emerges as a compelling option for the treatment of stretch marks, showing promise in improving the appearance of stretch marks by enhancing collagen production and supporting dermal repair processes. The need for comprehensive, high-quality research is critical to fully understanding the efficacy of PRP in SD treatment, underscoring the necessity for larger sample sizes, long-term follow-ups, and standardized treatment assessments.

About the author: Dr. Ali is a medical journalist and copywriter currently partnering with Selphyl® in crafting medical-related articles.

References

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13. Ibrahim ZA, et al. PRP vs. microdermabrasion for striae distensae. J Cosmet Dermatol. 2015;14(4):336–346.
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