sessh Flashcards
enzymes for iodide uptake
other important enzymes
NIS(na I, brings into thymocyte)
pendrin(chloride iodide exchanger, transports across the cell) to arrive in the follicular lumen
this is the first step of making iodide hormone
once in the lumen TPO-thyroidal peroxidase turns iodide to iodine via oxidization…. once in this form iodide can ionize tyrosine molecule (organifying them) making MIT and DIT. MIT and Dit couple up which is catalyzed by TPO
megalin
member of the LDL family that helps endocytize the iodine rich colloid. proteolysis is the final enzyme to make T4
5′ deiodinase
turns t4 to t3
then t3 can enter the nucleus to bind to thyroid receptor
Radioiodine uptake is usually markedly elevated
hyperthyroidism
inhibiting the peroxidase, thus blocking iodine organification, and coupling of the iodotyrosines.also blocks peripheral deiodination
thiamines
-does not block the uptake of iodide into the gland just stops the production. causes delayed effect because the thyroid will use up all its stores first.
DOC for Graves’ disease.
methimazole
_______preferred in severe hyperthyroid states or thyroid storm because_______
Propylthiouracil PTU
because blocks t4 to t3
pregnancy considerations with hyperthyroidism
1st trimester give PTU after give Methimazole
never give radioactive iodide
thiamin AE
pruritic rash, agranulocytosis, severe hepatitis*
PTU spa associated with liver failure
used prior to surgery to decrease vascularity of the thyroid gland and used in….
iodide
also used in a cytokine storm of cytotoxicosis
iodide AE
swelling of the neck and mouth, metallic taste in mouth, mouth ulcers
therapeutic effect is due to emission of β rays
radioactive iodine
contraindicated in pregnancy
amiodarone therapy can induce
either hyper or hypothyroidism
hypo esp in pts with AI thyroiditis(can add levothyroxine if meds cant be stopped)
hyper1. iodine in the amiodarone causes inc production of hormone esp if preexisting goiter(thioamine)
hyper2. destructive thyroid in previously normal pt causes inc in hormone release(glucocorticoids)
the obvious and not obvious side effects of glucocorticoids
metabolic effect(fat deposition), immunosupressive, anti-inflammatory
behavioural(insomnia, depression), pseudotumor cerebri(inc intracranial pressure), development of peptic ulcers(provokes H pylori and inc, stimulated fetal surfactant production, inc platelets and RBC
Weakness, fatigue, weight loss, hypotension, hyperpigmentation and
inability to maintain the blood glucose level during fasting.
tx
chronic adrenal insufficiency, Addisons
Daily hydrocortisone (with higher doses during periods of stress)
* Must be supplemented with fludrocortisone
antagonist at glucocorticoid & progesterone receptors
use?
MIFEPRISTONE
-Inoperable patients with Cushing’s syndrome due to ectopic ACTH production or adrenal carcinoma who failed to respond to other therapeutic manipulations
competes with aldosterone for its receptor
use?
spironolactone
Aldosteronism (diagnosis & treatment), hirsutism in women (acts as androgen antagonist), K+ sparing diuretic
spironolactone AE
Hyperkalemia, cardiac arrhythmia, impotence, menstrual abnormalities, gynecomastia,
potent & non-selective inhibitor of adrenal & gonadal steroid synthesis
use?
KETOCONAZOLE
-cushings syndrom
-prostate cancer
KETOCONAZOLE AE
hepatotoxicity
irregular menses, decreased libido, impotence, gynecomastia
blocks conversion of cholesterol to pregnenolone which leads to reduced synthesis of all hormonally active steroids
use?
AE?
AMINOGLUTETHIMIDE
Cushing syndrome due to adrenal cancer
lethargy, skin rash
relatively selective inhibitor of steroid 11-hydroxylation (interferes with cortisol & corticosterone synthesis)
use?
METYRAPONE
to test adrenal function
Tx for pregnant women with Cushing syndrome
METYRAPONE AE
hirsutism, salt and water retention
DKA management
replace fluid loss with saline, Insulin IV, possassium support, bicarb supp
advanced glycosylation end products
causes sone of the diabetic complications
-this and non enzymatic glycosylation, and inc TGFb will be caused from hyperglycemia and lead to diabetic glomerulosclerosis
diabetic glomerulosclerosis becuase of
non enzymatic glycosylation, inc TGFb, and advanced glycosalation end products appear from hyperglycemia and will cause:
-inc mesangial matrix formation
-inc type 4 collagen fibronectin
-glomerular hypertroph
parathyroid adenoma mutation
MEN1 mutation(MEN 1 and 2) and Cyclin D1 gene rearrangement
Preventing addition of iodine to tyrosine residues on thyroglobulin
organification
thioamines
prostatic carcinoma metastisis
hematogenous to axial selection
-osteoBLASTIC lesions which can present as low back ache
if spread to lymph will spread obturator and para-aortic lymph nodes
mϋllerian-inhibiting hormone`
stimulates the descent of the testes from the abdomen, the rest of the descent is due to androgen
cryptorchidism risks
infertility and germ cell neoplasm in the normal testicle
mutations for testicular germ cell tumors
Mutations involving genes encoding for the ligand for tyrosine kinase KIT and BAK.
- Reduplication of short arm of chromosome 12 (isochromosome 12p) is strongly associated
other associations are cryptorchidism, hydrospias, adrenal insufficiency
On a cut section they appear as homogenous, gray-white and lobulated masses, with minimal hemorrhage or necrosis.
* Histologically they are composed of uniform cells divided into lobules by fibrous septa, interspersed with lymphocytic infiltrate.
* The tumor cells are large round cells with a glycogen-rich (clear or watery appearing) cytoplasm, a round nuclei and prominent nucleoli.
seminoma
may secrete β-hCG and its levels may be elevated and used as a tumor marker.
seminoma, choriocarcinoma
On a cut section they have a variegated appearance due to presence of hemorrhage and necrosis.
* Histologically they are composed of sheets of large tumor cells with a basophilic cytoplasm, large nuclei and prominent nucleoli.
* The cells may be poorly differentiated (anaplastic) or forming tubular or papillary patterns.
embryonal carcinoma
endodermal sinus tumors
yolk sac
Histologically they are composed of lace-like or reticular network of cuboidal epithelial cells.
* The cells may be arranged in papillary structures or solid cords.
* Some tumor cells are arranged to have a mesodermal core with a
blood vessel along with surrounding parietal and visceral layers of
cells, like primitive glomeruli, known as
yolk sac tumor
known as Schiller-Duval bodies
tumor cells also have eosinophilic globules that have α1- antitrypsin and α feto protein (AFP)
yolk sac tumor
The tumors where the pluripotent germ cells differentiate into cells resembling placental trophoblastic tissue.
* It is a highly malignant and aggressive tumor with a poor prognosis.
choriocarcinoma
-this is in men and women
Histologically they are composed of neoplastic syncytiotrophoblasts and cytotrophoblasts.
what are features of each cell
choriocarcinoma
-Syncytiotrophoblasts are large multinucleated cells with eosinophilic cytoplasm containing hCG,
-Cytotrophoblasts are mononuclear polygonal cells with clear cytoplasm.
These tumors arise when the totipotent germ cells differentiate into various cellular components representing more than one germ cell layer.
teratoma
good prognosis, esp the mature ones with all three germ types there (immature has worse prognosis)
testicular germ cell tumor metastisis and non germ cell tumors
lymphatics for germ cell -retroperitoneal para-aortic lymph nodes → mediastinal →supraclavicular nodes.
non germ cell: hematogenously to the lungs
LDH is elevated in what tumor
large testicular germ cell tumors
Abnormal urethral opening on the ventral surface, anywhere along the shaft of the penis vs dorsal
ventral: hypospadias
dorsal: epispadias
both lead to many complications.
Is a condition where the orifice of the prepuce is too small to permit normal retraction. This could be due to developmental anomalies or infection with scarring of the preputial ring.
Phimosis
-clinically present as painful, urethral constrictions and recurrent urinary tract infections. Circumcision is curative.
Occurs when a phimotic prepuce is forcibly retracted over the glans penis, causing marked constriction & swelling.
Paraphimosis
-clinically present as painful, urethral constrictions and recurrent urinary tract infections. Circumcision is curative.
warty benign condition of penis shaft
caused by
progression?
CONDYLOMA ACUMINATUM
caused by HPV 6 and 11
-DOES NOT cause cancer
(other HPV infections the penis will cause caner)
Histologically they are composed of papillary infoldings of squamous epithelium which show
koilocytic changes (vacuolization of keratinocytes and nuclear abnormalities) that are characteristic
of
viral benign lesion
CONDYLOMA ACUMINATUM
risk factors for developing invasive squamous cell carcinoma of penis
cig smoking and Bowen disease
circumcision is protective
The lesions are papillary or flat and progress to large infiltrating masses involving the entire shaft of penis.
* Histologically they show squamous differentiation of tumor cells, keratin pearls and inter-cellular bridges may be seen. They may also have areas of necrosis and hemorrhage.
➢ Clinically they are painless growths until there is ulceration and secondary infection. They usually
spread to the inguinal lymph nodes early in the disease, however, widespread metastasis is rare and
until the lesion is very advanced.
invasive squamous cell carcinoma of penis
persistence of epidermal thickenings along the milk line, which extends from the axilla to the perineum
Polythelia, extra nipples
Dilated ducts
* Filled with inspissated secretions
* Numerous lipid-laden macrophages
Granulomas may form around cholesterol deposits and secretions
* Subsequent fibrosis produces an irregular mass with skin and nipple retraction
duct ectasia
Acute lesions: hemorrhagic and necrotic with neutrophils and few macrophages.
Later over the next few days→ proliferating fibroblasts and chronic inflammatory
cells
* Subsequently→ giant cells, calcifications, and hemosiderin
* Eventually→ focus replaced by scar tissue or is encircled and walled off by fibrous
tissue
* Grossly: ill-defined, firm, gray white nodules containing small chalky-white foci of
calcification
fat necrosis
Frequently multiple and bilateral, mobile masses
* Epithelial component is hormonally responsive
fibroadenoma of the breast
rubbery, grayish whiteish nodule (1) that
bulges above the surrounding tissue (2) and often contain slit like spaces
fibroadenoma of the breast
leaf like
phyllodes
phyllodes metastisis
hematogenously
“lumpy bumpy” breas
fibrocystic change,
benign
blue dome cyst
apocrine metaplasia
benign in fibrocystic change
can also be seen in intraductal papilloma
increase in the number of acini per
lobule seen in
adenosis
seen in pregnancy and fibrocystic change
what breast lesion mimics carcinoma
sclerosing adenosis(slinically and histologically)
intraductal papilloma(bloody discharge)
Components of sclerosing adenosis, papillomas, and epithelial hyperplasia- also called complex sclerosing lesions
radial scar