399 Matching Annotations
  1. Sep 2025
    1. phases – the 1st phase which is the immediate post-meal response and begins within two minutes of nutrient ingestion;

      phases. The first phase, which is the immediate post-meal response, begins within two minutes of nutrient ingestion. Insulin secretory granules docked to the beta cell plasma membrane are readily available to be released in this first phase.

    2. and the second phase which is due to newly synthesized insulin and can last for several hours.

      In the second phase, the undocked insulin secretory granules are part of the reserve pool and are mobilized for exocytosis and release of their contents, while additional insulin is synthesized in the beta cell. This second phase has a lower rate of insulin release and can last for an hour or more.

    3. It is a polypeptide secreted from the beta cells of the pancreas as proinsulin. The proinsulin is stored in secretory granules. This peptide is cleaved to form insulin and C-peptide, which are stored in the cytoplasm of the cell.

      It is a polypeptide synthesized in the beta cells of the pancreas. Proinsulin is folded in the rough endoplasmic reticulum (RER) where disulfide bonds form. Proinsulin is transported to the Golgi and then to immature secretory granules where most of the proinsulin is cleaved to form A and B chains held together by disulfide bonds, and the C-peptide is released. Mature "insulin secretory granules" fuse with the plasma membrane, and mature insulin, C-peptide and a small amount of proinsulin is released outside the cell.

    1. Hemoglobins

      "Intact hemoglobin tetramers..." (this is a point of confusion for students who have run SDS gels that would separate a tetramer into monomers, so emphasizing that this is a native gel electrophoresis helps)

    2. mutant)

      mutant). Compound heterozygous patients with beta-S and beta-C alleles are designated as HbSC. This combination of allelic variants is also considered a sickle cell anemia, although much less severe than HbSS. Hemoglobin C disease (HbCC) is not a sickle cell anemia.

    3. Combinations of Thalassemia and Sickle Cell Trait/Disease

      Change to: "Combinations of Sickle Cell Trait and Thalassemia or other Hemoglobin Variants" (Other title is a little confusing because a patient would not have sickle cell disease and another mutation because with sickle cell disease, they would have either 2 beta-S alleles or 1 beta-S and 1 beta-C allele. HbSC is also considered a sickle cell anemia although much milder than HbSS. (HbCC is not a sickle cell anemia.)

    4. proteins.

      (Globin gene duplication, either alpha- or beta-globin genes, can also cause an imbalance in the abundance of alpha- and beta-globin proteins, also resulting in pathology.)

    1. increasing the expression of sodium channels in the distal tubule of the kidney.

      increasing the expression of sodium channels, potassium channels, and the Na+/K+ ATPase in the distal tubule of the kidney.

    2. and increase sympathetic activity.

      increase in sympathetic activity, and a decrease in NaCl passing through the renal nephron, as detected by the salt-sensing macula densa cells. (if "interesting" mechanistic text on a slide is not explained a little bit, it is very annoying for the students. But they can do without all the things that angiotensin II does for now.)

    3. and starts with renin secretion from the juxtaglomerular cells of the kidney leading to formation of angiotensin I which is converted to angiotensin II by the enzyme angiotensin-converting enzyme (ACE).

      and starts with secretion of the protease renin from the juxtaglomerular cells of the kidney. Renin catalyzes the conversion of angiotensinogen, made in the liver, to angiotensin I that is converted to angiotensin II by the protease angiotensin-converting enzyme (ACE). (Students are often confused by and miss the fact that renin and ACE are proteases, so better to explain it here, as it is also illustrated in figure 4.)

    1. T4.

      Because of the similarity between TSH and a hormone that increases in pregnancy (human chorionic gonadotropin, hCG), a temporary gestational hyperthyroidism may develop with increasing hCG levels during pregnancy causing a thyrotoxicosis (discussed below).

    2. Figure 14.

      same comment as earlier- TPO is located on the membrane. This figure 14 is also based on Figure 5, so if Fig 5 is changed, Figs 10 and 14 could also be changed.

    3. fluids).

      While methimazole and propylthiouracil (PTU) both block thyroid hormone synthesis by inhibiting the PTO enzyme, PTU also inhibits peripheral T4 deiodination to active T3 so is used when a significant reduction in circulating thyroid hormone is required, as in a thyroid storm.

    4. Figure 10.

      Fig 10 does not show methimazole inhibiting TPO which is the drug target. This detail would connect this discussion with the one illustrated in Figure 5. If Figure 5 is redrawn as suggested, Fig 10 could also be redrawn, as it is based on Figure 5 information.

    5. Causes of increased TBG and high total T4:Estrogens (e.g. pregnancy, birth control pills) Congenital X-linked disorder causing elevated TBG levelsCauses of decreased TBG and low total T4:GlucocorticoidsProtein loss: malnutrition, wasting, liver failure, nephrotic syndrome

      paragraph duplicates Table 3. Remove.

    6. the organification process

      the uptake of iodide via the sodium/iodide symporter, resulting in reduced organification and synthesis of thyroid hormone, a phenomenon...

    7. thyroglobulin

      "thyroglobulin by the apical plasma membrane protein thyroid peroxidase (TPO)," (Figure 5 is incorrect because TPO is on the plasma membrane, so it probably should be redrawn. However if it isn't redrawn, adding the above phrase may help with confusion over its location. If the figure 5 is redrawn, pendrin can be added on the membrane where iodide (add a negative charge on iodide I-) crosses the membrane to the colloid.)

    8. It is synthesized in the follicular cells of the thyroid and stored in the colloid space.

      Thyroglobulin is synthesized in the thyroid follicular cells and moved via exocytosis to the colloid space where it is stored. Iodide is moved from the follicular cell to the colloid via the anion transporter protein Pendrin. (Mutations in the pendrin gene can cause Pendred syndrome, with deficiencies in hearing and thyroid function).

    9. two DIT molecules to form a T4 molecule, and that of DIT and MIT to form a T3 molecule.

      a monoiodo- or diiodotyrosine side chain to DIT residues within thyroglobulin, to form a T3 or T4 residue in thyroglobulin, respectively.

    10. the colloid fluid

      an acellular, amorphous gel-like colloid that changes its density depending on the activity of the thyroid. The colloid portion of the thyroid contains nascent....

    1. (ADH)

      (ADH) action. (Adding the word "action" covers ADH deficiency in pituitary DI as well as nephrogenic DI from vasopressin receptor (AVPR2) deficiency, and aquaporin (AQP2) deficiency.)

    2. so prolactin may be elevated in primary hypothyroidism.

      change to: "so prolactin may be elevated in primary hypothyroidism if the lack of thyroid hormone feedback inhibition causes elevated TRH." (They didn't have thyroid yet, so the connection between low TH causing high TRH needs to be made here for them.)

    3. acromegaly.

      Add: "Over-the-counter growth hormone may be used by body builders and athletes with the intention of increasing muscle mass; however the efficacy and long term effects are controversial." (Reword as you wish if you want to include this application- probably good for them to know people use this OTC, but I don't know if there is good data for its value.)

    4. When present in excess, GH excess can cause diabetes mellitus (high blood sugar).

      GH excess can cause high blood glucose (hyperglycemia), insulin resistance and diabetes mellitus.

    5. Releases ACTH (corticotropin), LPH, and b-endorphin.

      Releases ACTH (adrenocorticotropin hormone/corticotropin), beta-endorphin, alpha-melanocyte stimulating hormone, and beta-lipotropin )

    1. and the JAK-STAT pathway

      JAK-STAT is not a receptor. Ligands bind to a cell surface receptor and that activates the JAK-STAT pathway. So, this should be removed from that sentence or described separately, such as ..."and the cell surface receptors that activate the JAK-STAT pathway."