13. Integumentary System (Skin) Flashcards
What is the integumentary system? What is his role? x2
The skin, hair, nails, sebaceous and sweat glands and sensory receptors form the integumentary system.
1* Skin, the largest organ in the body, acts as a major protective barrier against chemicals, pathogens and other substances in the environment.
2* Has a major role in detoxification via the excretion of waste products. If the liver, kidneys, lungs or gut are under stress, the resultant irritation and inflammation can contribute to skin dysfunction.
* Any underlying dysfunction, such as toxic overload, must be considered when seeking to address common skin disorders including acne, eczema, rosacea and psoriasis.
What is acne vulgaris?
Acne vulgaris = inflammatory skin condition characterised by excess sebum production, follicular hyperkeratinisation of sebaceous ducts, follicular colonisation by Cutibacterium acnes and inflammation.
Who and what is affected by acne?
Acne predominantly affects skin with dense sebaceous follicles — primarily the face, but also the chest and back.
* Commonly affects adolescents with incidence tending to decrease with age.
* More common in males than females due to hyper-responsiveness to androgen hormones.
* Microbial colonisation with Cutibacterium acnes implicated but not the causative factor.
Acne clinical presentation?
- Comedones (pimples) mainly affect face, shoulders, upper chest, back.
- Dilated pores with dark plugs of keratin (a protein found in skin) and sebum (secretion of sebaceous glands).
- Open (blackheads), closed (whiteheads).
- Dome-shaped papules formed through sebum and keratin accumulations deeper in the ducts.
- Bacterial infection causes inflammatory cysts (granulomas) beneath the skin, which result in scarring.
- Low self esteem: Link to anxiety and depression.
Causes and RF for Acne ? x7
- hormones
- PCOS — association with hyperinsulinemia / insulin resistance.
- Psychological stress via HPA-axis, release of CRH, promotes lipogenesis and induces cytokines (IL6 + IL11) in keratinocytes → inflammation.
- Depression / anxiety: Emerging studies in psychodermatology (mind / skin link). Skin and nerve cells are connected at the embryonic level through ectoderm and continue to communicate and affect each other throughout life.
- insulin resistance
- VitD deficiency
- microbiome
Causes and RF for Acne ? Hormones
Hormones: Increased androgens.
* Free testosterone — and particularly by its
potent metabolite dihydrotestosterone (DHT).
* DHEA — most abundant steroid in body.
* DHEAS — sulphated version of DHEA.
Stimulate hyperkeratinisation of follicles.
* Increase sebum production.
* Stimulate acne lesions.
* Greater activity of 5-alpha-reductase (converts testosterone to DHT) — associated with factors such as hyperinsulemia, obesity and low zinc).
Hyperinsulinemia decreases sex hormone binding globulin (SHBG), increasing levels of free testosterone.
DHEA = dehydroepiandrosterone DHEAS = dehydroepiandrosterone sulphate
- Hormone fluctuations e.g., puberty, menstruation and pregnancy.
Causes and RF for Acne ? insulin resistance
Insulin resistance: Diet, obesity, inactivity.
* ↑ proliferation of keratinocytes, stimulates synthesis of androgens and ↑ sebum production.
* Hyperinsulinemia upregulates IGF-1 and downregulates insulin-growth factor-binding protein-3 (IGFBP-3). Net effect = ↑ androgen production and direct impact on keratinocyte hyperplasia and apoptosis.
- IGF-1 has been shown to ↓ FoxO1, which leads to activation of mTORC1.
- In acne, mTORC1 mediates sebaceous gland hyperproliferation, lipid synthesis, and hyperplasia of keratinocytes.
- Insulin resistance, smoking, low zinc levels, and the excess adipose tissue associated with obesity can lead to ↑ levels of DHT, and subsequently to acne.
Causes and RF for Acne ? Foods x3
- Dairy and high GI / GL foods ↑ IGF-1.
- Dairy also increases circulating levels of insulin with similar consequences to a high GL meal.
- Dairy and meat (high BCAAs), saturated fats (esp. palmitic acid) and trans fats activate mTORC1. Palmitate: Major FA = 32% milk TGs.
Causes and RF for Acne ? VitD deficiency
- The role of factors such as vitamin D, diet, obesity, the microbiome and auto-inflammation is evolving.
- Vitamin D — a role in regulating proliferation and differentiation of keratinocytes and sebocytes ― anti-comedogenic properties.
Causes and RF for Acne ? microbiome
- Microbiome — patients have a distinct gut microbiome with higher levels of bacteriodes. Acne lesions are associated with increased proportion of C. acnes as a skin commensal bacterium.
TCM for acne
- TCM: Acne is a manifestation of dampness and heat in the body, which tends to rise to the head.
- On the face the location of spots can be a clue to the location of the cause — used the facial reflex zone chart.
- Treatment is aimed at clearing damp heat. Damp clearing foods include whole grains, warming / drying spices e.g., cinnamon, ginger. Heat clearing foods incl. bitter foods e.g., dandelion, rocket.
- In Ayurveda, acne is an outward sign of inward bodily distress caused by eating too many spicy, sweet and greasy foods.
Dietary exclusion for acne
- Avoid foods linked with acne pathogenesis — dairy, trans fats, ↑ saturated fat, ↑ red meat (↑ BCAAs), sugar, refined foods, high GI / GL foods, excess omega-6 fatty acids, alcohol, spicy foods.
Dietary inclusion for acne x9
Dietary inclusions: Follow the CNM Naturopathic Diet.
1* Consume low GI / GL foods: Balance blood sugar levels to regulate insulin.
2* Increase fibre to improve glycaemic control. Helps reduce toxic overload and supports sluggish digestive system.
3* Omega-3 (walnuts, flaxseed, chia seeds, fish) decrease IGF-1. EPA reduces inflammation and inhibits mTORC1 activation. Has an acne-protective effect.
4* Flaxseeds contain enterolactone, which has shown to decrease circulating free androgens.
5* Increase low GI fruit and vegetables — alkalising, ↑ antioxidant and anti-inflammatory nutrients.
6* Include green tea, turmeric, berries — contain polyphenol compounds that decrease mTORC1.
7* Ensure a healthy microbiota by targeting harmful bacteria and / or enriching beneficial bacteria. See GI lecture.
8* Include cinnamon in the diet to improve glycaemic control. ↑ insulin receptor sensitivity, facilitating transport of glucose into the cells.
9* Ensure good water intake to support elimination channels.
What diet is effective for acne?
Fasting is highly effective — see popular dietary models nutrition 1
Nutrients for Acne x5
- Vitamin A 5000 iu / day
- Vitamin B3 (niacinamide) 20–50 mg / day in B complex.
- Vitamin D Optimise levels
- Chromium 200–1000 mcg / day
- Zinc: 15–30 mg
Vit A for acne - functions
- Plays a role in collagen synthesis and supports integrity of the skin barrier. Supports immune function.
- Reduces sebum production and hyperkeratosis of follicles.
- Supports immune function and inhibits growth of C. acnes.
Vit B3 for acne - functions
- Works alongside chromium in insulin regulation.
- Anti-inflammatory and reduces histamine release.
- Inhibits C. acnes-induced IL-8 production in keratinocytes through the NF-κB and MAPK pathways.
- Topical niacinamide gel 4% as effective as antibiotic gel ↓ number and severity of acne lesions.
Vit D for acne - functions
- Regulates metabolism of keratinocytes and sebocytes.
- Supports glycaemic control by increasing
cellular sensitivity to insulin.
Chromium for acne - functions
- A component of chromodulin — a protein that increases sensitivity of the enzyme tyrosine kinase, facilitating insulin receptor activity and entry of glucose into the cell.
Zinc for acne - functions
- Modulates immune and inflammatory processes.
- Inhibits 5α reductase, ↓ DHT.
- Antimicrobial activity against C. acnes.
- May ↓ number and severity of acneiform lesions.
Herbs for acne x5
- Herbs that modulate androgens: Saw palmetto and stinging nettle root inhibit 5α-reductase (↓ conversion of testosterone to DHT).
- Cleavers (Galium aparine) dried herb as a tea (2 tsp per cup). Supports lymphatic function, assisting in the removal of wastes.
- Assess need for liver detoxification. Herbal support includes milk thistle, rosemary, green tea, turmeric. Antioxidant and upregulates phase II detoxification.
- Anxiety / depression: Passionflower (anxiolytic, promotes restful sleep), lavender (helps elevate mood, calms agitation).