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Old 10-17-2002, 11:39 AM   #1 (permalink)
 
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Maybe Eric and Njchica can help us find out through science why these other foods could create sensitivity to UV

Fennel,Mustard,Figs, Dill, Butter cup ( glad the didn't say Butter fingers.. )
Parsley, Carrots..

Lets see if we cant explore this some and find ouut why this is..

C
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Old 10-17-2002, 11:45 AM   #2 (permalink)
 
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Yes please fill us in Eric and Njchica...I am interested in knowing the facts about these UV sensitive foods!

Christina
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Old 10-17-2002, 03:29 PM   #3 (permalink)
 
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Eric is away at convention till Saturday..

I will try to look up some of this later and maybe njchica can jump in and help..
If you have time.. help out by locating these foods and lets see what the deal is with them and UV..
C
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Old 10-17-2002, 04:29 PM   #4 (permalink)
 
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Figs and Sensitivity....

In several patients the effect of a phototoxic reaction to the juice of fresh figs (ficus carica) was observed as a striped pigmentation on the arms (after rubbing in the fruit juice followed by exposure to the sun), or as a patchy pigmentation of the face after eating fresh figs. Reference is made to the pathogenetic identity of this furocoumarin phototoxic reaction and the clinical transition of ficus dermatitis both to "Berloque dermatitis" (from the oil of types of citrus) and to bullous meadow dermatitis (from the juice of types of heracleum). Reference is also made to the similarity of the therapeutic furocoumarin reaction in PUVA therapy.


Hope this helps...
Christina


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Old 10-17-2002, 06:19 PM   #5 (permalink)
 
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Psoralens are a group of substances found in figs, limes, parsnip roots and a particular river weed.

these are the same chemicals that we talked about in the celery thread.
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Old 10-17-2002, 06:24 PM   #6 (permalink)
 
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Table 5. Risk activities for phytophotodermatitis (Modified from Table 6.3.115)
Gardening
Brushing against Dictamnus spp. (USA, Europe, N. China) or Ruta (UK)

Cultivating celery, parsnip, or parsley

Clearing weeds with a 'weed wacker' (USA) or 'string trimmer' (UK)

Pruning or harvesting figs

Growing Angelica for herbal medicine (Korea), cake decorating (when candied), tonic

& flavoring in wines (esp. Benedictine)(N. Am.) 9, 47

Canning or Processing fruits and vegetables
Canning celery or stocking celery in grocery stores50

Making lemonade or limeade, especially if selling it outside51,52

Squeezing lime juice for margaritas and other drinks53

Hiking/Jogging/Walking
Through fields and riverbanks (Heracleum spp.) (Pacific Northwest, Europe)

Rolling in the meadow

Hiking in southern California and Baja California, Mexico (Cneoridium dumosum) -

Coast spice bush (Rutaceae)54

Medications and Cosmetics
Application of 'tan promoters' or perfumes containing bergamot oil (berlock dermatitis)

Excessive UV exposure after taking or applying psoralens for PUVA

Application of rue (Ruta spp.) as an insect repellant

Play
Making peashooters with Heracleum mantegazzianum (giant Russian hogweed) or

other Heracleum spp.

Playing amongst rue bushes and Umbelliferae

Fighting with parsnips/celery

Ingestion
Ingestion of excessive psoralens (esp. celery) before using a tanning parlor (UVA)

Ingestion of Chlorella (Japan)

Clothing
Wearing leis of Pelea anisata (Hawaii)55

Fig Leaf

http://www.telemedicine.org/botanica/bot5.htm


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Old 10-17-2002, 06:32 PM   #7 (permalink)
 
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It looks like all of these plants are thought to contain the same chemicals (psoralens) that we learned about in the celery thread.

PHOTOTOXIC PLANTS

Four main plant families have been implicated as causing phytophotodermatitis: Umbelliferae (Apiaceae), Leguminosae (Fabaceae), Moraceae, and Rutaceae.

Table 6. Important members of the Umbelliferae implicated in phototoxic reactions

Scientific Name Common Name(s) Comments
Ammi majus
false Bishop's weed
Historical and economic importance: 2000 BC vitiligo treatment. Major source of 8-MOP.

Angelica archangelica
Angelica
Candied portions used in cakes Characteristic Benedictine flavor

Angelica sylvestris
Wild angelica


Anthriscus sylvestris
Cow parsley, wild chervil
'Strimmer dermatitis'

Apium graveolens
Celery
Infected plants have more psoralens

Daucus carota
Carrot


Foeniculum vulgare
Fennel


Heracleum laciniatum
Tromsų Palm
Scandinavia

Heracleum lanatum
Cow parsnip
North America

Heracleum mantegazzianum
Giant Russian hogweed, wild rhubarb, hogweed tree
Giant weed naturalized across UK, Canada, USA

Heracleum sphondylium
European cow parsnip, hogweed, cow parsley
Main cause of 'strimmer dermatitis'

Pastinaca sativa
Parsnip
Furocoumarins in leaves, roots, stem, fruits

Petroselinum crispum
Parsley

Table 8: Phototoxic members of the family Rutaceae Citrus aurantifolia
Lime

Citrus aurantium
Bitter orange

Citrus bergamia
Bergamot orange

Citrus limetta
Sweet lemon

Citrus limon
Lemon

Citrus paradisii
Grapefruit

Citrus sinensis
Sweet orange

Dictamnus albus
Burning bush, gas plant

Phebalium argentuem
Blister plant

Pelea anisata
Mokihana

Ruta graveolens
Rue

Moraceae

The last family of phototoxic importance is the mulberry family. Ficus carica (the fig tree) is native to the Middle East and has been widely cultivated throughout warm, temperate regions of the world. No other food source is mentioned more in the Bible, and the milky juice has been used to destroy warts and cure skin infections. In A.D. 50, Dioscorides noted that vitiligo would repigment if 'cataplasmed with ye leaves or ye boughes of ye Black Figge.'26

Other Families

Compositae (daisy family), Ranunculaceae (buttercup family), Brassicaceae, Convolvulaceae, Hypericaceae, and Anacardiaceae have been reported to contain furocoumarins and other photosensitizing chemicals, but none of these has been shown to cause clinical phytophotodermatitis.

Here is some information about how these chemicals may cause "tanning"....

Psoralen-induced hyperpigmentation occurs via a multitude of interrelated changes. After bifunctional photoadducts are formed in keratinocyte and melanocyte DNA, increased mitosis of basal layer keratinocytes and melanocytes is observed. In fact, the melanocyte population will double or triple within 3-7 days. Melanocyte hypertrophy and increased arborization is also seen. Tyrosinase activity increases to make more melanin that is packaged into an increased number of melanosomes found in melanocytes and transferred to malpighian layer keratinocytes. In fair-skinned individuals, the distribution of melanosomes changes. Instead of small, clumped melanosomes in keratinocytes, large, single, dispersed melanosomes are seen capping the nuclei. This pigmentation can last for months or years.

if you have time to kill, check out this whole page. it is very interesting. (at least to a science geek like me)

http://www.telemedicine.org/botanica/bot5.htm




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Old 10-17-2002, 07:26 PM   #8 (permalink)
 
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This topic is very interesting to me..

Look here at this statement..
"The phototoxic effect of furocoumarins relies on their ability to absorb photons. After forming short-lived, high energy states, the energy is released and causes subsequent cellular damage.

Two distinct but concurrent reactions take place when psoralen-treated skin is exposed to UVA radiation. Psoralens have an absorption peak at 300 nm and an action spectrum peak at 335 nm.46 In an oxygen-independent reaction, UVA excites psoralens to a triplet state that causes covalent binding of the psoralen molecule with nuclear DNA.

Now let me ask you this.. we are tampering with our DNA if we would eat too much of these Psoralen family foods?
So a good question to ask our clients would be on their question sheet.. Does their diet consist of these types of foods?

Lets go get Don Smith to help here also ..
This is goooooood stuuffffff..

Njchica... this thread rocks..

You may be a science geek.. but we love this stuff..
So Geek ON.......


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Old 10-17-2002, 07:40 PM   #9 (permalink)
 
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what I read about these chemicals and what I know about mutagens is this: it alters the base pair sequence of a DNA strand. It changes the codons and the instructions that those codons carry. Whatever protein was supposed to be made, probably won't be after mutation.... although there are 60 codon possibilities and only 20 amino acids, so there is some redundancy built into the system... whatever was supposed to happen, probably won't because the proper protein (made up of amino acids) isn't being created.

After bifunctional photoadducts are formed in keratinocyte and melanocyte DNA, increased mitosis of basal layer keratinocytes and melanocytes is observed. In fact, the melanocyte population will double or triple within 3-7 days. Melanocyte hypertrophy and increased arborization is also seen.

What this is saying, as I read it, is that that altered DNA (caused by psoralens) now directs cells (keratinocytes and melanocytes) to divide, divide, divide, divide, divide repeatedly. This must cause the darker tan.... due to more of these cells being produced.

It is the same mechanism as a cancerous tumor-- excessive cell division. As I said before, anytime you mess with DNA, you are playing a risky game. I am interested to know if these "intentional" DNA mutations always occur in the same way without harmful side-effects...

do they just cause hyperpigmentation of cells? are the signs just a warning that people might get too dark? or are there other risks involved?

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Old 10-17-2002, 07:44 PM   #10 (permalink)
 
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Two distinct but concurrent reactions take place when psoralen-treated skin is exposed to UVA radiation. Psoralens have an absorption peak at 300 nm and an action spectrum peak at 335 nm.46 In an oxygen-independent reaction, UVA excites psoralens to a triplet state that causes covalent binding of the psoralen molecule with nuclear DNA.

and this just gives me horrible horrible nightmares and flashbacks to my 8-hour Organic Chemistry lab in England... God I hated that course with a passion I never knew I had. In fact, just because I hate spectroscopy so much, I'm going to pretend I have no clue what the above paragraph means.

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